testmethodforelectricalsafetyof informationtechnologyequipment ttastandard enactedon:31dec.1998...

TTA Standard Enacted on : 31 Dec. 1998

TTAS.KO-09.0018/R1 Revised on : 23 Dec. 2004

Test Method for Electrical Safety of

Information Technology Equipment

Telecommunications TechnologyAssociation

TTA Standard Enacted on : 31 Dec. 1998

TTAS.KO-09.0018/R1 Revised on : 23 Dec. 2004

Test Method for Electrical Safety of

information Technology Equipment

Telecommunications TechnologyAssociation

TTAS.KO-09.0018/R1(2004.12)i

Preface

1. Summary

This test procedure provides measurement guide to comply with safety

requirements of information technology equipment.

2. References

2.1 International Standards(Recommendations) : None

2.2 Domestic Standards : None

2.3 Other : None

3. The Comparison of Other Standard (International Recommendation or Standard,

Domestic Standard, or etc.)

3.1 The Relation of International Standard (Recommendation) : None

3.2 Additional Items to International Standard (Recommendation) : None

4. Related Items to Intellectual Property Right

None

5. Related Items to Conformance Certification

Applicable to electrical safety requirements for information technology

equipment.

TTAS.KO-09.0018/R1(2004.12)ii

6. History

Version Issue Date Contents

1 1998. 12. 31 Established

2 2004. 12. 23. Revision

TTAS.KO-09.0018/R1(2004.12)iii

Contents

1. Test procedure and pre checking items ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 12. Input test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 43. Permanence of marking test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 64. Capacitor discharge test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 85. Humidity test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 116. Working voltage measurement‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 127. Limited current circuit test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 198. Ground continuity test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 249. Limited power source test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 2710. Strain relief test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 3211. Stability test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 3412. Impact test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 3613. Drop test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 3914. Direct plug-in moment test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 4115. Lithium battery reverse current test‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 4416. Heating test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 4717. Leakage test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 5618. Electric strength test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 6119. Abnormal test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 6920. Transformer abnormal test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 7621. Ball pressure test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 8122. TNV voltage measurement test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 8523. Telephone ringing signal test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 9024. Operating voltages generated Externally for TNV-2 and TNV-3 circuit ‥‥ 9925. Separation of the telecommunication network from earth ‥‥‥‥‥‥‥‥ 10226. Leakage current to a telecommunication network ‥‥‥‥‥‥‥‥‥‥‥‥ 10427. Impulse test for TNV circuits ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 10828. Electric strength for TNV circuits ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 11029. Flammability test for fire enclosures of movable and stationary equipment(exceeding 18kg) ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 113

TTAS.KO-09.0018/R1(2004.12)iv

30. Flammability test for fire enclosures of movable and stationary equipment(not exceeding 18kg) ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 116

31. High current arcing ignition test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 11932. Hot wire ignition test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 12233. Hot flaming oil test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 12534. Flammability test for classifying Materials V-0, V-1 or V-2 ‥‥‥‥‥‥ 12735. Flammability test for classifying HF-1, HF-2 or HBF ‥‥‥‥‥‥‥‥‥‥ 13236. Flammability test for classifying Materials HB ‥‥‥‥‥‥‥‥‥‥‥‥‥ 13737. Flammability test for classifying Materials 5V ‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 14038. Motor tests under abnormal concitions ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 14739. Ionizing radiation test ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 15640. Test for thermal controls ‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥‥ 158

Annex I Opening a court particulars from 2nd petal ‥‥‥‥‥‥‥‥‥‥‥‥ 161

TTAS.KO-09.0018/R1(2004.12)1

1. Test procedure and pre checking items

1.1 Test procedure

<Table 1-1> Test procedure table

Document check1. Operating manual2. Circuit diagram3. Parts list4. Specification of parts

Correspondingitem ofTechnical Standard

Structuraltest

Operatingtest

Partstest

1.5 Suitability test1.6 Label inspectionT3 Label endurancetest

T2 Input rating test 1.5 Non-approvedpart test

T15 Lithium battery testT39 X-ray emission test

3.2 Non-approved powercord test

T29 Fire-resistance over 18kgT30 Fire-resistance less than 18kgT31 Current Arc testT32 Heating wire ignition testT33 Ignition oil testT34 V-0,1,2 fire-resistanceT35 HF-1,2,HBF fire-resistanceT36 HB fire resistanceT37 5V fire resistance

3.1 Wiring inspection3.2 Power cordsuitability inspectionT10 Inspection of a powercord of fixed type3.3 Inspection ofterminal for power

2.1 Accessibility test2.2 Decision of insulation2.3 SELV circuit inspection2.6 Breaking device inspection2.7 Protecting device inspection2.8 Safety interlock inspection2.9 Insulation distance

inspection2.10 Inspection of connectionbetween equipments

T11 Stability test4.2 External force test4.2.6. Stress releasing test4.2.8 CRT test4.3 Structural testT12 Strong ball shock testT13 Drop testT14 Direct connecting test

T16 TemperatureIncreasing test

T17 Current leakage testT18 Withstanding voltage testT19 Abnormal state test

T6 Operating voltagemeasurementT5 Constant temperature &humidity testT4 Capacitancedischarging testT7 Current limit testT8 Ground continuity testT9 Power limit test

T20 Transformerabnormal state testT38 Motor abnormalstate testT40 Temperaturecontroller testT21 Ball pressure test

T22 TNV voltage measuring testT23 Telephone call signal testT24 TNV-2,-3 circuit testT25 Isolation test betweenelectrical communicationnetwork and groundT26 Current leakage test toelectric communication networkT27 TNV circuit impulse testT28 TNV circuit withstandingvoltage test

The numbers after T are the corresponding numbers of the table of contents of page 1,

and the underlined items are the tests that the equipments may be broken after the tests.

TTAS.KO-09.0018/R1(2004.12)2

1.2 Documents submission and EUT inspection.

<Table 1-2> Documents submission and EUT inspection items

No. Item Description and the related parts Check

1 Application formCheck if all information is filled out on the basisof a proper form.

2 Block diagram To check the outline of a product

3 Circuit diagramCircuit diagram of whole equipments (Inparticular, all parts related to a power supplyand TNV are prerequisite.

4 Product label Labels actually used - 3 sheets

5 Parts list

To list all of the replacement parts .1. All parts of power supply parts and motors,transformers.2. Parts for electric communication networkcircuit

6Certificate of parts(IEC, EN, KS, Authorized testinstitution)

1. Power cord2. Inlet3. Switch4. Fuse, fuse holder5. Thermal fuse6. X,Y capacitor7. Socket outlet8. Photocoupler9. Surge absorber device (varistor)10. CRT: cathode lay tube

7 Specification of parts

1. Discharging resistor2. Noise filter (winding type)3. Bridge diode4. FET5. Triac6. Windings7. Motors (including solenoid)8. Degaussing coil

8

List of plastic parts(manufacturer and model) andcertificate (in case of thecertified products)

1. Enclosure2. PCB (printed circuit board)3. Diverse insulated sheet4. Power connectors

9 Preparatory EUT and quantity

1. Finished products under test - Over 12. Power supply - Over 2 sets3. Transformer, impregnation over 2,

non-impregnation over 24. High voltage parts (EBT, high voltage cable)

- 1 Each5. Replacement parts for abnormal state test1) Fuse - Over 10 ea2) Bridge diode - 5 ea3) FET - 5 ea4) Other parts which can be damaged inopen/short circuit test - Over 5 ea (diodes, ICs,capacitors etc.)6. Motors - Over 2 ea

10Other documents (differentaccording to products)

* The above items are the listed-up parts which can be used for information and communication

products in general, items which are not related to EUT may be ignored.

TTAS.KO-09.0018/R1(2004.12)3

2. Input rating test

2.1 Corresponding Clause of Technical Standard : 1.6.1

2.2 Purpose of test

To test suitability of the given electric rating.

2.3 Test instruments

A. Voltage regulator : 1-250 VAC, 60 , 15A or equivalent

B. Power analyzer or VAW meter

C. Electronic load or additional loading equipment

D. Connecting cable

2.4 Test method and procedure

A. Apply the rated voltage and highest or lowest limit value of the rated

voltage to EUT respectively.

B. Set EUT condition at its worst (state of highest power consumption) in

normal operating state.

In case that there are extra slots or external terminals, test it in state that a

load is applied according to specification presented by a manufacturer.

Example :

- Monitor : Test in full white, max brightness, max contrast mode.

- Printer : Test in state that it continues to print out "H" letter.

- Facsimile : If it has COPY mode, continue to copy by using CCIT No3 Test

Form.

C. Measure input current and power consumption in normal state (after 10

minute in power-on state generally).

TTAS.KO-09.0018/R1(2004.12)4

2.5 Decision of suitability

Input current or power should not exceed 10 % of the rated current or power

in state of normal load.

2.6 Preparation of test certificate

<Table 2-1> Electric data

1.6 Table : Electric data (normal state) 1.1.

Fuse

#

Rated I or P

(A)or(W)U(V) P(W) I(mA) Ifuse(mA) Condition/State

F1 1.5A 220V 220W 1.0A 1.0ACCIT NO.3 used,sequential copy

A. Fuse# : Record part number of a fuse which is used in primary circuit of a power

supply (ex : F1).

B. Rated I or P : Record the rated current or the power consumption marked on a

label.

C. U(V) : Record the voltage applied in test

D. P(W) : Record the measured power consumption.

E. I(mA) : Record the measured input current.

F. Ifuse(mA) : If a fuse is used in primary circuit, measure and record the current

which flows through the fuse.

G. Condition/State : Record operating condition and state of an equipment used in the

test.

Fill with the recorded values as shown above in the corresponding blanks of a test

certificate of Clause 1.6.

TTAS.KO-09.0018/R1(2004.12)5

3. Permanence of marking test


3.2 Purpose of test

To check solidity and endurance of label.


A. Stop Watch

B. Rag

C. Kerosene, water

* As a fatty solvent nucleic acid, kerosene is to be the one that maximum

volumetric contents of perfume is 0.1%, kauri-butanol is 29, primary boiling

point is around 65 , dry point is around 69 , and specific gravity is

around 0.7 Kg/I.


A. Rub the label with a wet rag for 15 seconds.

B. Rub the label again with a reg wet with kerosene for 15 seconds.

C. Check printing state of label.


A. After the test as mentioned above, it should be possible to read the label

finely and the label should not be separated and be curled up.

B. As a part which can be separated, if the trace can cause misunderstanding

by replacing the part, a label required in the technical standard should not

be attached in the part which can be separated.

TTAS.KO-09.0018/R1(2004.12)6


Record the test results in the corresponding blanks of a test certificate format

of Clause 1.7.15.

TTAS.KO-09.0018/R1(2004.12)7

4. Capacitor discharge test


4.2 Purpose of test

To prevent the electric shock by the electric charge in a capacitance

connected to the power supply circuit at the point that external power source is

disconnected.


A. Storage oscilloscope (minimum input impedance : 10 )

B. Timer

C. Scope probe

D. Switch


Note : If the total line capacitance is less than 0.1 uF, this test is not

required.

A. In storage oscilloscope, a probe with impedance of at least over 10

should be used.

B. It is recommended to use the probe of 100:1 rather than 10:1 to minimize

influence from a specific equipment.

C. Test should be done in both states that the switch of an equipment is

turned on and off in consideration of the possibility that power is broken

wherever the switch of an equipment is.

D. Connect EUT as shown in the following figure.

E. Set the switch to position 1 and start EUT.

TTAS.KO-09.0018/R1(2004.12)8

F. Disconnect the switch from 1, and one second later, set the switch to

position 2 and then store the waveform in the Oscilloscope (measure at

Storage Mode of oscilloscope), and after one second, measure the peak

value.

G. Repeat F. procedure and find maximum peak value.

EUT

Oscilloscope

(Fig. 4-1) Block diagram of capacitor discharging test


A. Calculating method

If EUT has a discharging circuit whose time constant does not exceed the

value as follows, EUT is regarded as suitable.

- In case of A type plug connecting equipment : 1 second

- In case of permanent connecting equipment and B type plug connecting

equipment : 10 second

The time constant is the value that rms capacitance in uF is multiplied by

rms discharging resistance in M .Ω

TTAS.KO-09.0018/R1(2004.12)9

B. Actual measuring method

Voltage attenuates to 37% of the initial value at the time constant of 1.

Thus, the measured voltage should attenuate within 37% of the initial value

when the test is done on the basis of the above Clause 4.4.

* Reference : V = U exp-t/RC (U: peak voltage of line, R: discharging

resistance, C: line capacitance)

4.6 Preparation of test certificate.

Record the test result in the corresponding blanks of a test certificate format

of Clause 2.1.10.

TTAS.KO-09.0018/R1(2004.12)10

5. Humidity test

5.1 Corresponding Clause of Technical Standard : 2.2.2, 2.2.3, 5.3

5.2 Purpose of test

To measure the degree of humidity-proof regarding humidity inside of an

equipment.

5.3 Test instrument

A. Thermohygrostat

B. Withstanding voltage tester


A. Put EUT in a thermohygrostat.

B. Pull the measuring point out of the thermohygrostat for test withstanding

voltage.

C. Turn on the power switch of EUT for withstanding voltage test.

D. Set a thermohygrostat to relative humidity at 91%-95% and temperature at

20 -30 .

E. Keep EUT for 48 hours in the above state.

F. Do not apply voltage to parts or part assemblies during the test.

G. After 48 hours, put the EUT in the thermohygrostat or in a room at the

regulated temperature and conduct withstanding voltage test on the basis of

the related standard of Clause 5.3.


When the test is done on the basis of Clause 5.3 of Technical Standard,

insulation break-down should not happen.

TTAS.KO-09.0018/R1(2004.12)11

A. When test voltage is applied, if current increases rapidly beyond control, that

is, if insulation can not limit the current to less than a certain value, it is

regarded as insulation breakdown.

B. Corona discharge or instant flashover is not regarded as insulation

breakdown.


Record the test result in the corresponding blanks of a test certificate format of

Clause 2.2.2 and 2.2.3.

TTAS.KO-09.0018/R1(2004.12)12

6. Working voltage measurement


6.2 Purpose of test

To utilize as fundamental material in test for creepage distance, space

distance, distance through insulation and withstanding voltage.


A. Voltage regulator : 1-250 VAC, 60 , 15 A or equivalent.

B. True rms meter

C. Storage oscilloscope

D. Power analyzer or VAW meter

E. Electronic load or additional load devices

F. Connecting cable


A. Connect EUT to the rated voltage or maximum value of rated voltage range.

B. Set EUT condition at its worst (highest power consumption) in state of

normal operating.

In case that there are extra slots or external terminals, test it in state that

maximum load is applied according to specification presented by a

manufacturer.

C. Assume that the conductor part, which is not grounded but accessible, is

grounded.

TTAS.KO-09.0018/R1(2004.12)13

D. If a transformer winding and other parts are not connected to a circuit,

which has potential regarding the ground, and are isolated, these are

regarded as grounded at the point that maximum operating voltage is

measured.

E. In case of dual insulation, the operating voltage of both ends of the

primary insulation is decided by assuming that the circuit of both ends of

the secondary insulation is shorted, and the inversion can be made. In case

of a transformer winding, it is assumed that the primary insulation or

secondary insulation is shorted at the highest voltage point at both ends of

other insulations.

F. In the insulation between 2 windings of a transformer, in consideration of

the external voltage which winding can be connected, maximum voltage

between arbitrary 2 points at both ends of 2 windings is used.

G. In insulation between the winding of a transformer and other parts,

maximum voltage between a point of the winding and other part is used.

H. In case that voltage is applied to the space distance of a primary circuit :

- DC voltage includes the peak value of the pulsating current which is

superposed.

- Non-repetitive transient phenomenon (ex : the one by air disturbance) is

disregarded.

- The voltage of ELV circuit , SELV circuit or TNV circuit is regarded as 0.

For proper application of Table 4 of Technical Standard :

- Regarding the repetitive peak voltage which exceeds the peak value of

main power supply, use repetitive maximum peak value.

TTAS.KO-09.0018/R1(2004.12)14

I. In case that the voltage is applied to the space distance of the secondary

circuit :

- DC current includes the peak value of the superposed ripple.

- In case of non-sine wave, use the peak value.

J. In case that voltage is applied to creepage distance :

- Use actual rms value or DC value.

- In case that DC value is used, the superposed ripple is disregarded.

- The condition of short time (ex : call signal of TNV circuit) is disregarded.

K. In case that voltage is appled to the withstanding voltage test :

In a operating voltage used to decide the withstanding test voltage regulated

in Clause 5.3 of Technical Standard, use DC current value for DC voltage

and use the peak value for other voltage.

L. Measuring position :

Except that insulation is inspected by other method as functional insulation

on the basis of Clause 2.2.6 of Technical Standard, measure and record the

voltages of the rms values (true rms) and peak values regarding all points

that insulation is required.

For example : Both ends of all parts which are close to primary circuit and

a ground, all parts and insulation which isolate primary circuit

from secondary circuit. (For example : In case of a transformer,

voltage is measured regarding all combination of primary pins

and secondary pins.)

TTAS.KO-09.0018/R1(2004.12)15

Description on the application of operating voltage

The voltage of ELV and SELV circuit should be considered if operating voltageregarding a creepage distance is decided. But these are ignored if operating voltageregarding space distance and withstanding voltage are decided.

Discharge through space depends on maximum voltage value (peak value). Short spacedistance can cause flashover when transient voltage is generated. The repetitive peakvalue is considered in Table 4 of Technical Standard. Creepage distance should not beshorter than space distance. Creepage distance depends on the voltage which showsskin effect for a long time. Accordingly, creepage distance depends on DC voltage andrms voltage, and is not affected by transient voltage and instant peak voltage.

Minimum operating voltage of a circuit

Nominal power source voltage is used for minimum operating voltage to decidegrounding with primary circuit or non-grounded metallic part, creepage distancebetween secondary circuits, or space distance and withstanding voltage test voltage.

For example, the above regulation is applied because a phase line and a neutral lineare connected crossly due to a socket outlet for a home, which wires are connectedwrongly, or terminals for power connection which are provided without polarity mark.

Actually, a neutral line is regarded as a phase line when accessibility to a switchingpower source and a space distance are decided.

Operating voltage between primary and secondary

When creepage distance between a point of primary circuit and a point of secondarycircuit is decided, the voltage between a point of primary circuit and a point ofsecondary circuit should be considered instead of maximum primary voltage which canbe generated between 2 points of primary circuit. For example, voltage differencebetween the collector of a switching transistor and (-)DC rail can be up to maximum 2times of the voltage between (+)DC rail and (-)DC rail. But, this voltage is not usedwhen creepage distance between primary circuit and secondary circuit is decided.Intension of this measurement is to find actual voltage that insulation system can coverfor the ground.In creepage distance between a collector and secondary circuit, or between otherarbitrary points of primary circuit and secondary circuit, rms (true rms) voltage betweenthese points should be used.

In case of space distance, additional space distance of Table 4 in Technical Standardbased on maximum repetitive peak voltage should be added to the space distancepresented in Table 3 of Technical Standard.

TTAS.KO-09.0018/R1(2004.12)16

Measuring instrument

In measuring rms voltage, a measuring instrument should be able to measure rms valueof sine wave and non-sine wave and should be suitable for high frequency of aswitching power supply.

Frequency Bandwidth : At least over 5 times of switching frequencyMemory of Oscilloscope : Minimum 3 cycles of the input voltage.Crest factor : Maximum peak value measuring capability = Maximum voltage measuring

range × Crest factor(ex : It is possible to measure maximum 750 V if crest factor is 3 and max range 250V meter.)


This test is used as fundamental materials for the test of creepage distance,

space distance, distance through insulation and withstanding voltage.


Example of operating voltage measurement in power supply PCB

Accessible metallic part

Ground part connectedto a protecting ground

Example)Primarycircuit part

Secondarycircuit part

(Fig. 6-1) Measurement of insulation

TTAS.KO-09.0018/R1(2004.12)17

Measure rms voltage and peak voltage at both ends of each part from to① ⑨

in the above figure and record them in test certificate form as follows. However,

if the measured voltage is lower than nominal voltage of a power supply,

recording is omitted and creepage distance and space distance can be applied

on the basis of the nominal voltage of a power supply.

Measure voltage of the parts, whose insulation is required, on the upper side of

a PCB whose parts are mounted on, as mentioned above and record them in the

following format.

<Table 6-1) Measurement of space distance and creepage distance

2.9.2 and 2.9.3 Table : Measurement of space distance, creepage distance

Measuring part ofspace distance andcreepage distance

Operatingvoltage(peakvalue: V)

Operatingvoltage(averagevalue: V)

Referencespacedistance(mm)

Spacedistancevalue(mm)

Referencecreepagedistance(mm)

Creepagedistancevalue(mm)

Transformer pin 3,pin 10

420V 4.0 X.X 6.4 X.X

A. Measuring part of space distance and creepage distance : Record the

measured part and the required insulation.

(ex : between C1 soldering part and ground (B))

B. Operating voltage (peak value, V) : Record the measured peak voltage.

C. Operating voltage (rms value, V) : Record the measured rms voltage(True

rms).

D. Reference space distance : Record the reference distance calculated on

the basis of Table 3, 4, 5 of Technical Standard.

E. Space distance value : Record the space distance measured actually at

both ends of a measuring part.

TTAS.KO-09.0018/R1(2004.12)18

F. Reference creepage distance : Record the reference distance calculated on

the basis of Table 6 of Technical Standard.

G. Creepage distance value : Record the creepage distance measured actually

at both ends of a measuring part.

Compare the measured distance value with the reference value and record in the blank

of decision.

Record also in the corresponding blank of Clause 2.9 of a test certificate.

TTAS.KO-09.0018/R1(2004.12)19

7. Limited current circuit test


7.2 Purpose of test

To secure safety in state of normal operating and insulation breakdown or parts

trouble regarding the part where high voltage is applied and a user or a service

man can access.


A. 2 non-inductive resistor

B. Storage oscilloscope

C. Proper capacitor measuring instrument (LCR meter)


Measurement 1

A. Connect a non-inductive resistor of 2 to 2 arbitrary parts of a current

limit circuit or an arbitrary point of a current limit circuit.

(The equipments which a current limit circuit is applied to : LCD inverter

circuit of a note-book PC, FBR output circuit of a copy machine or a laser

beam printer)

B. Connect an equipment to the disadvantageous voltage of -10% or +6% of

the rated input voltage.

C. Operate an equipment in most disadvantageous condition during normal

operating.

D. Measure voltage and frequency at both ends by using a storage

oscilloscope and convert them into current.

E. Repeat procedure A. to D. in state that primary insulation or secondary

insulation is shorted (state of single trouble).

TTAS.KO-09.0018/R1(2004.12)20

Other circuit Current limitcircuit

Oscilloscope

(Fig. 7-1) Block diagram of measurement of current limit circuit

Measurement 2

A. Measure capacitance ( F) of the described part of A. item of Measurement 1μ

by using a proper instrument (ex: LCR meter) which can measure capacitance

in state of power-off.

B. Measure maximum operating voltage on the basis of the method described in

Measurement 1 in state that a resistor of 2 is not connected at the

identical part where the capacitance is measured.

C. Use the following formulas to decide if the measured voltage is suitable to

Technical Standard.

- 450 V peak or DC part : Apply the measured capacitance (uF) as it is.≥

- 450 V peak or DC part 15,000 V peak or DC :＜ ≤

Stored charge = C = ( F)V.μ μ

- 15,000 V peak of DC part : Energy = J = 1/2 CV＜ 2=5×(10)-7 ( F) Vμ 2


A. Allowed current value based on Measurement 1 :

- If frequency 1 K : it should not exceed 0.7 mA peak or 2 mA DC.≤

- If frequency > 1 K : it should not exceed 0.7 mA peak x K .

However, maximum allowable current is 70 mA.

TTAS.KO-09.0018/R1(2004.12)21

B. Requirements of Measurement 2 :

- 450 V peak or DC part : Capacitance of circuit should not exceed 0.1≥ μ

F.

- 450 V peak or DC < part 15,000 V peak or DC : Stored charge should≤

not exceed 45 C.μ

- 15,000 V peak or DC < part : Energy should not exceed 350 mJ.


A. Record the corresponding items in Clause 2.4 of a test certificate.

B. If the measured points are many, it is desirable to write "note #" in the

corresponding blank of a test certificate and record the details of test result

in "note #".

Note #1 ex :

Current through 2 K resistor :① Ω

Measuredpart

Condition

Measured voltage(V peak or DC)

Measuredfrequency(K )

Calculated current(mA peak or DC)

Allowable current(mA peak or DC)

Measurement of capacitance :②

Measuredpart

ConditionMeasured voltage(V peak or DC)

Capacitance( F)μ

Stored charge( C)μ

Energy(mJ)

- Measured part : Record both ends whose voltage is measured.

(ex : pin 3 and 4 of a connector CN1)

TTAS.KO-09.0018/R1(2004.12)22

- Condition : Record the state of operating, if it is done in normal state, or if

it is done in a single trouble, such as short or open of a part.

(ex : C1 short)

- Measured voltage : Record the measured voltage.

- Measured frequency : Record the measured frequency.

- Calculated current : Divide the measured voltage by 2000 and record it.

- Allowable current : consider the frequency and record permission

standard. (ex : It should be 14 mA if the measured frequency is 20 K .)

- Capacitance : Record the value in F which is measured with a properμ

instrument or LCR meter.

- Stored charge : Record by calculating as C = ( F)V.μ μ

- Energy : Record by calculating as J = 5(10)-7 ( F)Vμ 2.

Record the corresponding blank only according to the voltage, and record the

rest as "-".

TTAS.KO-09.0018/R1(2004.12)23

8. Ground continuity test

8.1 Corresponding Clause of Technical Standard : 2.5

8.2 Purpose of test

To decide the suitability of protecting ground used for an equipment.


A. AC or DC power supply of 0-12V, 0-25A

B. True rms voltmeter, ammeters

C. a connecting cable and connecting terminals

D. Or an integrated ground continuity test instrument which integrates all of

above items


A. Apply test current between the point which a grounded parts can be

activated electrically by breakdown of primary insulation and a protecting

ground terminal or a protecting ground contact.

B. Apply 1.5 times of current capacity of a certain hazard voltage circuit at the

point where the grounded part can be activated electrically in breakdown of

primary insulation. However, test voltage should not exceed 12 V, and test

current should not exceed maximum 25 A whether it is AC or DC.

TTAS.KO-09.0018/R1(2004.12)24

Description

In the above B. item, current capacity depends on fuse etc. of primary power supplymostly. For example, if a main fuse of 1 A is used, the current capacity of the circuitcan be regarded as 1 A. In the figure as shown blow;

Secondarycircuit

Primarycircuit

Fuse (F1, 1A)

Ground

(Fig. 8-1) Test position of ground continuity

If L1 is a phase line and L2 is a neutral line and the plug in use is not the inversiontype, 1.5 times of current capacity can be regarded as 1.5A. However, if the plug isthe inversion type and both of L1 and L2 are phase lines, current capacity should notbe decided by F1, but is decided by an over current protecting device of buildingcabling. Generally, 15 AFMF is used as an over current protecting device in buildingcabling. As 15A × 1.5 times is 22.5A, it is the basis that maximum test current ofTechnical Standard is decided as 15A.

Accordingly, in case of an equipment which uses a plug of the inversion type or isconnected to a power source that a phase line and a neutral line are not discriminatedclearly, if fuses are not used in L1 or L2, test current of 25A should be used.

In the above figure, if a protecting ground is used to A point, primary insulation isenough for a primary circuit and a secondary circuit. To regard A point as a protectingground, the resistance of a grounding conductor should be less than 0.1 when 25 AΩis applied between "ground" and A point.

Generally, as A point include secondary windings of a transformer, it is hard to pass 25A test. Accordingly, in most cases, the test is done by regarding B or C point only asprotecting grounds and a reinforcing insulation is done for primary and secondarycircuits and a primary insulation is done between primary circuit and ground.

TTAS.KO-09.0018/R1(2004.12)25

C. Measure the voltage difference of both ends in state that 1.5 times of

current capacity or 25A is applied between end ports which are to be used

as a ground and a protecting ground, and convert it into resistance.

D. No comment is made about a test time, however, generally the test is done

on the basis of 1 minute.

Note

1) In measuring a resistance value, the resistance value of a conductor for

protecting ground of a power cord is not included.

2) In case of an equipment which is connected to a partial assembly or a

separated equipment for protecting ground by using a wire of a multi-core

cable which supplies power to a partial assembly or an equipment, the

resistance value of a wire for protecting ground of a multi-core cable is not

included. However, the wire should be protected with a protecting device with

proper rating in consideration of impedance of a wire.

3) Attention should be paid so that the contact resistance between the end of a

probe for measurement and a metal part under test does not affect the test

result.


The resistance value between a ground contact point or a grounding terminal

and a part which needs grounding should not exceed 0.1 .Ω


Record the measured part, test current, and the measured resistance value in

Clause 2.5.11 of test certificate form, and record the decision of "pass" or

"rejected". In case of an complicate equipment which has a lot of measuring

points, record the detailed data by using "Note#" format.

TTAS.KO-09.0018/R1(2004.12)26

9. Limited power source test


9.2 Purpose of test

As the one which can be applied to a power supply consisted of a

stand-alone equipment such as an adapter, if a power supply satisfies the

voltage limit test, in case of other equipment which receives power from it, an

enclosure for fire-wall can be omitted according to Clause 4.4.5.2 of Technical

Standard.


A. Voltage regulator : 1-250Vac, 60 , 15A or equivalent


C. Electronic load or resistance load device

D. Volt meter (ac & dc)

E. Ammeter (ac & dc)

F. Stop watch


A. Measure maximum no load output voltage (Uoc) in state that the rated

input voltage, or +6 % or -10 % of the rated input voltage, is applied to

an equipment.

B. Connect an electronic load or a resistant load to an output port and

increase the load gradually. At the same time, measure voltage and current

which can flow at maximum. And if possible for the circuit, measure current

even in the state that the output is shorted. However, disregard the current

which does not flow for over 60 seconds, and disregard the transient value

which stays at less than 100 ms in case of VA measurement.

(Calculate current Isc which can flow at maximum and maximum VA.)

TTAS.KO-09.0018/R1(2004.12)27

C. In measuring regarding the above B. item, if there is an over current

protecting device, test it in state that the equipment is bypassed. And if

there is an adjusting network, test the above item even in the state of

single trouble.


A. An isolation transformer should be used for power limit which activates in

normal power or power limit which is battery-driven type which supplies

power to a load and is charged in normal power.

B. Output is limited basically so as to be suitable to Table 8 of Technical

Standard.

C. Impedance limits the output so as to be suitable to Table 8 of Technical

Standard. In case that an equipment of static characteristic temperature

coefficient is used, a corresponding equipment should be suitable to the

test regulated in Clause 15, 17 of IEC 730-1 and Clause J15, J17 of IEC

730-1.

D. An over-current protecting device is used, and the output is limited so as to

be suitable to Table 9. of Technical Standard.

E. An adjusting network limits the output so as to be suitable to Table 8 of

Technical Standard even in the state of normal operating and single trouble

(open or short circuit) of an adjusting network.

F. An adjusting network limits the output so as to be suitable to Table 8 of

Technical Standard in state of normal operating, and an over-current

protecting limits the output so as to be suitable to Table 9. of Technical

Standard in state of single trouble (open or short circuit) of an adjusting

network.

TTAS.KO-09.0018/R1(2004.12)28

G. In case that an over current protecting device is used, the protecting device

should be an electro-mechanical device which is a fuse or unadjustable and

non-automatic reset type.

H. In case of power limit of battery-driven type, decide by checking the data about the

battery from a manufacturer. In case of measuring Uoc or Isc in accordance with

Table 8, 9 of Technical Standard, the test is done in state that the battery is fully

charged.

Allowable values on Technical Standard

<Table 9-1> Intrinsically allowable values of power limit

Output voltage

(Uoc)1)Output current

(lsc)2)

A

VA3)(V×A)

V a.c V d.c

20≤

20<Uoc 30≤

---

20≤

20<Uoc 30≤

30<Uoc 63≤

8.0≤

8.0≤

150/Uoc≤

5×Uoc≤

100≤

100≤

Conditions which can be applied to <Table 9-1>

1) Uoc : Output voltage measured in accordance with the Clause 1.4.5. of

Technical Standard in state that all load circuits are disconnected. This voltage

value is DC value excluding sine wave AC and ripple. If non-sine wave AC

and peak ripple are over 10 % of DC, the peak voltage should be less than

42.4 V.

2) Isc : Maximum output current which flows after operating for 60second in state

of all non-capacity loads (including short circuit).

3) VA : Initial transient value which stays at less than maximum output VA 100 ms

in state of all load, is disregarded.

TTAS.KO-09.0018/R1(2004.12)29

<Table 9-2> Allowable power values which are not limited intrinsically (Over current

protecting device is required.)

Output voltage

(Uoc)1)Output current 2)

(lsc)

A

VA3)(V×A)

Rated current value of

an over current

protecting device4)A

V a.c V d.c

20≤ 20≤

1,000/Uoc≤ 250≤

5.0≤

20<Uoc 30≤ 20<Uoc 30≤ 100/Uoc≤

---- 30<Uoc 60≤ 100/Uoc≤

Conditions which can be applied to <Table 9-2>

1) Uoc : Output voltage measured in accordance with the Clause 1.4.5. of

Technical Standard in state that all load circuits are disconnected. This voltage

value is DC value excluding sine wave AC and ripple. If non-sine wave AC and

peak ripple are over 10 % of DC, the peak voltage should be less than 42.4 V.

2) Isc : Maximum output current which flows after operating for 60second in state

of all non-capacity loads (including short circuit) and state that an over current

protecting device is bypassed.

3) VA: Initial transient value which stays at less than maximum output VA 100 ms

in state of all load or in state that an over current protecting device is

bypassed, is disregarded.

4) The rated current value of an over current protecting device is on the basis of

a fuse and a circuit breaker which break a circuit within 120 seconds when 210

% of rated current value regulated in the table flows.


Record the contents of use and decision in Clause 2.11 of test certificate form,

and the detailed test data is attached by using "Reference#" format.

TTAS.KO-09.0018/R1(2004.12)30

10. Strain relief test


10.2 Purpose of test

To check the implemental solidity of a power cord of fixed type.


A. Push pull gauge with the range of 0-100N

B. Vernier calipers


A. Arrange a power cord to the most frail direction in state that the equipment

is fully fixed.

B. Mark the current state with a pen in state that a power cord is free.

C. Pull a power cord of the equipment 25 times with the force regulated in

Table 12 of Technical Standard. Apply tensile strength to most frail

direction for 1 second every time.

<Table 10-1> Physical test of a power cord

Weight of an equipment (Kg) Tensile strength (N)

M 1≤

1<M 4≤

4<M

30

60

100

TTAS.KO-09.0018/R1(2004.12)31


A. A power cord should not be damaged during the test.

It can be checked through visual inspection and withstanding voltage test

regarding reinforced insulation between conductor part which can be

accessed by a human and a conductor.

B. There should not be any displacement of a cord over 2 long and tension

should not be applied to the connecting part.

C. Creepage distance and space distance should not be shortened to less

than the value regulated in Clause 2.9 of Technical Standard.


Record the tested tensile strength and the displaced length after test in Clause

3.2.5 of test certificate form, and mark its suitability.

TTAS.KO-09.0018/R1(2004.12)32

11. Stability test



To check the stability of installation of equipments.


A. 10 sloped plate˚

B. Push pull gauge of 0 -250N range

C. Push gauge of 800N


A. In case of an equipment with a container, put in the contents of the measure

which can be the most disadvantageous state, less than rated capacity, and

test it.

B. In case of an equipment with tilt and swivel, put these on the most

disadvantageous place, and test it.

C. In case of a caster and a jack used when an equipment is operated in

normal state, put these on the most disadvantageous place. However, a

caster is used for transportation of an equipment only, and if it is necessary

to put it down by using a jack after installing by instruction of a

manufacturer, use a jack only and do not use a caster. Put a jack on the

most disadvantageous place.

D. Put an equipment on a plate with 10 % slope in state that its door and

drawer are closed and turn it by 360 .˚

TTAS.KO-09.0018/R1(2004.12)33

Equipment

(Fig. 11-1) 10 sloped plate test.˚

E. In case of an equipment which weighs over 25 Kg and is used on the floor,

apply force from all directions except vertical direction with the force of 20%

(maximum 250 N) of the weight of the equipment at the position within 2 m

on the floor. Put the door and the drawer, which can move when a user or a

service man uses, at most disadvantageous place in the range instructed in

the manual of manufacturer.

F. In case of an equipment which is used on the floor, apply the force of 800

N to downward at the place, where maximum moment is applied, of all

horizontal side or of the side which foot can be put on, from the position

within 1 m on the floor. Close the door and the drawer during the test.

11.5 Decision of suitability.

In the above test A. to E., the equipment should not fall down.


Record the test result in the corresponding blank of Clause 4.1.1. of test

certificate form.

TTAS.KO-09.0018/R1(2004.12)34

12. Impact test

12.1 Corresponding Clauses of Technical Standard : 4.2.4, 4.2.7


To check the implemental solidity of an enclosure used for the equipment.


A. Strong ball (diameter: 50mm, weight: 500±25g)

B. Pendulum device

C. PVC pipe


A. The test is done on the outside of an enclosure where a human may

access a dangerous part in case that it is broken. Other equipments which

free fall test is applied to are excluded.

(Examples of parts to be shocked: 1. outside of an enclosure close to an

electrically activated part, 2. weak part such as a ventilator, 3. an enclosure

positioned at the front side of protecting membrane for insulation.)

B. Put a perfect enclosure or a part of an enclosure, representing the worst

part which is not reinforced, to a normal position.

C. Fall free a strong ball, to the part except the vertical side of an equipment,

vertically at the 1,300 high, through a pipe.

D. Hang a strong ball on a proper device for the swing of the pendulum to

impact on the vertical side of an equipment, and apply horizontal impact by

falling free at 1,300 high.

TTAS.KO-09.0018/R1(2004.12)35

E. If it is not suitable to do pendulum test, lay an equipment on the floor and

then fall free a strong ball to apply vertical impact. It can be done in stead

of pendulum test.

Drop position of a strong ball

Drop position ofa strong ball

Impactposition

EUT EUTImpact position

Hard floor Hard floor

Hard

floor

(Fig. 12-1) Shock test by using a strong ball


A. After the test, dangerous voltage part should not be exposed. (Decide with

a test finger and a test pin.)

B. A space distance and a creepage distance should not be shortened to

less than the regulated.

C. In case of an equipment of class 1, a protecting ground should not be

damaged.

D. In case that a power cord of fixed type is used, a fixing device of a cord

should not be damaged.

E. Safety of an overheat-proof device, an over current protecting device,

interlock, etc. should not be deteriorated.

TTAS.KO-09.0018/R1(2004.12)36

F. If doubted, conduct the corresponding withstanding voltage test regarding

secondary insulation and the reinforced insulation.

G. Damage of finish, the dented part which does not badly affect the safety

and water-proof, tiny scratch, and crack on the surface of molded product

which is reinforced with fiber, are not regarded as "rejected".

H. If an enclosure and a part of an enclosure which are prepared separately

are used for the test, the parts need to be assembled with an equipment

and need testing.


Record the test result in Clause 4.2.4. of test certificate.

TTAS.KO-09.0018/R1(2004.12)37

13. Drop test

13.1 Corresponding Clauses of Technical Standard : 4.2.5, 4.2.7


To check the implemental solidity of the enclosure used for an equipment.


A. Floor for test : the one that hard timber with thickness of over 13 ,

attached on two layers of plywoods with thickness of 19-20 , is fixed on

the concrete floor or equivalent floor without elasticity

B. measuring tape


A. As a hand-held equipment and a direct connecting equipment and an

equipment of less than 5 Kg for table, the test is done only for a

hand-held part with sound function or a headphone, or an equipment

which is designed so as to be used with a telephone of cord connecting

type.

B. Drop 3 times a set of finished equipment on the floor for test so that the

result can be worst.

C. Drop height is as follows.

- Hand-held and direct connecting type equipment : 1 m

- Equipment for table : 750

TTAS.KO-09.0018/R1(2004.12)38


A. After test, dangerous voltage part should not be exposed. (Decide with a

test finger and a test pin.)

B. A space distance and a creepage distance should not be shortened to

less than the regulated.

C. In case of an equipment of class 1, a protecting ground should not be

damaged.

D. In case that a power cord of fixed type is used, a fixing device of a cord

should not be damaged.

E. Safety of an overheat-proof device, an over current protecting device,

interlock, etc. should not be deteriorated.

F. If doubted, conduct the corresponding withstanding voltage test regarding

secondary insulation and the reinforced insulation.

G. Damage of finish, the dented part which does not badly affect the safety

and water-proof, tiny scratch, and crack on the surface of molded

product which is reinforced with fiber, are not regarded as "rejected".

H. If an enclosure and a part of an enclosure which are prepared separately

are used for test, the parts need to be assembled with an equipment and

need testing.



TTAS.KO-09.0018/R1(2004.12)39

14. Direct plug-in moment test



Regarding direct connecting type equipment, to check if a plug can support

the weight of an equipment.


A. Test jig as shown in the following figure.

B. Vernier calipers

C. A scale


It is possible to check if the test by using a test jig or calculation satisfies the

standard.

(If the result of measurement by calculation is doubtful, it should be measured

exactly by using a test jig.)

Test by using a test jig

1) Check the weight (WM) of a weight of a test jig in advance. (If a weight is

marked after measuring the weight, a weight can be used in next test

conveniently.)

TTAS.KO-09.0018/R1(2004.12)40

(Fig. 14-1) Moment test jig

2) Set a balancing arm so as to be horizontal by moving a weight, and record

the position of the weight.

3) Insert a test instrument to a consent of a test jig.(As a place 8 apart from

a side which a plug and a consent are contacted face to face should be on

the line of a pivot, check if the consent of a jig complies with the standard

prior to test.)

TTAS.KO-09.0018/R1(2004.12)41

4) After inserting a plug of test instrument to a consent, set a balancing arm so

as to be horizontal by moving a weight again, and record the position of the

weight.

5) Calculate displacement L of a weight between before and after insertion of

a plug.

6) Calculate torque which a consent is receiving on the basis of the following

formula.

Torque = WM × L × 9.8 (N.m) (Note : In calculating, unit of Kg or meter

should be applied as so to meet N.m.)

Computing by calculating

1) Find center of gravity of an equipment by using proper tool as shown in the

following figure or by checking materials, and measure the weight m.

2) Measure the distance a and b from the center of gravity as shown in the

following figure.

Center ofgravity

(Fig 14-2) Computing moment by calculation

TTAS.KO-09.0018/R1(2004.12)42

3) Calculate Torque by using the following formula.

Torque = m × 9.8 ×(0.008 + a + b ) [N.m]


Torque by actual measurement or calculation should be less than 0.25 N.m.



TTAS.KO-09.0018/R1(2004.12)43

15. Lithium battery reverse current test



To estimate the suitability of a protecting circuit used for preventing

compulsory charging and discharging of a lithium battery or a battery with

similar and poisonous materials.

15.3 Test instrument

Ammeter


A. If a lithium battery or a similar battery is used, check the circuit to prevent

compulsory charging and discharging in advance.

(Fig. 15-1) Battery protecting circuit

TTAS.KO-09.0018/R1(2004.12)44

As shown in the figure, generally, inflow of the inverse current is blocked

by connecting a diode and a resistor, or two diodes in series.

B. Pick a battery out of an equipment for safety, and connect current meter

instead.

C. Connect an equipment to rated input voltage and start normal operation.

D. Set all protecting devices to open or short, one by one at each time, as

shown in the above figure, and at each time, measure and record the

current on current meter.


The measured value should be less than maximum and abnormal charging

current value presented by a manufacturer.

(If a battery is certified by UL, maximum and abnormal charging current value

on UL certificate can be used as basis.)


Record the result in Clause 4.3.21 of test certificate, and record the exactly

measured value by using "Note#“.

TTAS.KO-09.0018/R1(2004.12)45

16. Heating test

16.1 Corresponding Clauses of Technical Standard : 5.1, 1.4.8, 3.3.2


To check the possibility that a fire breaks out due to temperature rise, or

hazard occurs due to insulation breakdown and transformation of plastic.


A. Voltage regulator : 1-250Vac, 60 , 15A or equivalent　

B. True rms voltmeter, ammeter, wattmeter.

C. Power analyzer or VAW meter

D. Electronic load or other load devices

E. Thermocouple

F. Temperature recorder, coil resistor tester

G. Thermocouple welder


A. measuring points

- Winding and core of a transformer

- Power cord

- Electrolytic condenser (for smoothing)

- Insulated conductor close to a heating element (wire etc.)

- Heating element

- Surface of an enclosure

- Fiber, phenolic, polumeric materials used for insulator

- The place, where temperature rise is expected, of the points which can

be contacted intentionally or unintentionally in usual operation.

- Ambient temperature during the test

TTAS.KO-09.0018/R1(2004.12)46

B. Install a thermocouple in a necessary point including the points described

in the above A. item.

(It is desirable to measure the temperature of a coil with a thermocouple in

case of a switching power supply (SMPS), and with resistance tester in

case of a linear type.)

How to use a thermocouple

A thermocouple should not be jointed by twisting or soldering, but should be welded,①

and should not be twisted on bead.

Welding : good Welding : no good Soldering : no good

How to attach to a part is to fix with a tape at a point 1 cm apart from the end and②

then apply sauresin cement (mixed with water glass and kaolin powder at the ratio of

5 to 1) and wait until it is set.

TTAS.KO-09.0018/R1(2004.12)47

How to select a thermocouple:③

- T type : Suitable to low temperature, especially to use in sub-zero temperature.

- J type : Unsuitable in test of high frequency magnetic component (error: ±5-10 )

- K type : Suitable in test of high frequency magnetic component (possible to

replace with N-couple)

- E type : Non-magnetic (possible to replace in case that K-couple shows the

influence of magnetic effect)

How to attach thermocouple :④

- 130 : Glass fibre cloth tape (3M/No. 27 tape)～

-130 250 : Epoxy/Cyanoacrylate adhesive(Be careful because thermal conductivity～

is low.)

- High temperature (1100 ~) : Sauresin cement (good thermal conductivity, but

inconvenient to use)

C. Connect an equipment to power and start operation normally. At this

moment, In case that there are extra slots or ports or terminals for external

power supply, test in the state that a load is applied according to the

specification presented by a manufacturer.

(Regarding the condition of normal operating, refer to Appendix L of

technical standard and the measurement of T2 input rating in this

procedure.)

D. An equipment which is installed as a part of a built-in equipment, a

rack-mount equipment or a big equipment is tested in the mostly

disadvantageous condition (actual state or sham state) allowed in the

installation manual from the manufacturer.

E. Regarding voltage applying to an equipment, the test is done at -10 % and

+6 % of the rated voltage respectively.

F. The test time is as follows.

- In case of an equipment which works continuously, test until it reaches

the stable state.

TTAS.KO-09.0018/R1(2004.12)48

- In case of an interruptively operating equipment, test until it reaches the

stable state by repeating "start" and "stop" in accordance with the time of

"start" and "stop".

- In case of an equipment which works for a short time, test for the defined

operating time.

The state of the stable temperature means that the temperature is kept for

over 15 minutes.

If an equipment reaches the stable state, stop the test and record the final

temperature.

G. In case that the temperature is measured by a resistance tester.

- To minimize measurement error by conductors except a winding, the

conductor for measurement of an instrument should have the proper

diameter, and the measuring point should be close to an inlet port of a

winding excluding a power cord and other wires.

Measuring pointMeasuring point

(Fig. 16-1) Measuring point by a resistance tester

- Error would be small if the temperature of a winding which has higher

resistance of primary and secondary windings is measured.

TTAS.KO-09.0018/R1(2004.12)49

Notice

When a thermocouple is attached to a part, attention should be paid so that the①thermocouple does not contact any conductor which has potential. (It can be amajor cause of the electric shock of a human body or trouble of an equipment. Andif even very low current flows through the thermocouple, wave form which is notexpected would show on a recording paper.)

In case of measurement of current leakage or test of withstanding voltage, a②thermocouple should be removed.(major cause of trouble of an equipment).

Matters to be attended in the test of a switching power supply (SMPS) : As error③between an actual value and an measured value can be caused by magneticinfluence from a magnetic part (ex : transformer) of a switching power supply, iftemperature is stable, turn off the power and measure the temperature again andcheck the temperature difference with the one when power was applied.

In case of an equipment which has a cooling fan, attention should be paid so that④the part which a thermocouple is attached is not cooled by the cooling fan.


A. An over current protecting device should not work during test, and sealing

material should not flow out.

B. If an operating temperature of an equipment by a manufacturer is over 25

, the allowable temperature rise value can be changed on the basis of

the following formula.

T - Tamb Tmax + 25 - Tmra≤

T = Temperature of the corresponding part measured under the regulated

test condition

Tmra = The higher temperature of maximum ambient temperature presented

by the manufacturer or 25

TTAS.KO-09.0018/R1(2004.12)50

Accordingly, if an operating temperature is defined as 0-35 in a user

manual or a document which is provided with an equipment, maximum

allowable temperature rise value is 10 lower than the allowable

temperature regulated in the following table. (The test under 35 is not

needed, and it can be reduced after testing in general environment. And, in

any case, the test should not be done at a temperature higher than the

regulated operating temperature.)

C. The temperature of parts contacting an electric wire should be less than a

rated temperature value of the wire.

D. The measured temperature should not exceed the allowable temperature rise

value in Table 16 of Technical Standard.

TTAS.KO-09.0018/R1(2004.12)51

<Table 16> Allowable temperature rise value (1)7)

Applied part Allowable temperature rise value (K)

Insulations including coil insulation :

- A class insulating materials

- E class insulating materials

- B class insulating materials

- F class insulating materials

- H class insulating materials

75

90

95

115

140

(refer to note 1)2) and 5))

Including inside of an equipment and a

power cord - All external wire insulated

with A class insulating materials.

Rubber or PVC insulation

- No T mark

- T mark

50

T-25

Other thermoplastic insulation (refer to note 3))

If a non-portable power cord is not used,

a terminal with a ground terminal for

external ground wire of an equipment of

fixed type.

60

A part contacting inflammable liquid (refer to 4.4.8 item)

Parts (refer to 1.5.1 item)

<Table 16> Allowable temperature rise value (2)

User access area

Allowable temperature rise value (K)

MetalGlass, ceramic,

glass materialsplastic, rubber5)

Handle, knob, grip etc. which

can be gripped or contacted for

a moment.

35 45 60

Handle, knob, grip etc. which

can be gripped continuously in

usual operation.

30 40 50

Outside of an equipment which

can be accessible4).45 55 70

Inside of an equipment which

can be accessible6).45 55 70

TTAS.KO-09.0018/R1(2004.12)52

Conditions which can be applied to (1) and (2) of Table 16.

1) In case of measuring the temperature rise of coils by using a thermocouple, the

value which is 10 K lower than the value of this clause is applied. However, a

motor is excluded.

2) Insulation class of an insulating materials (A, E, B, F and H class) should comply

with IEC 85.

3) Because there are many kinds of thermoplastic material, it is impossible to regulate

the allowable temperature rise value of them.

Thermoplastic materials should be suitable to the tests regulated in Clause 5.4.10.

4) The allowable temperature rise value of the outside of an equipment that the

dimension is less than 50 and there is no possibility to be contacted during

operation is 75 K.

5) Regarding each material, if there are data to decide the allowable temperature rise

value, it should be decided by studying the data.

6) If conditions as follows are satisfied, the temperature higher than the allowable

temperature rise value can be acceptable.

- If there is no possibility to contact the part by chance.

- If the warning mark of high temperature is on the corresponding part, it is allowed to

use the symbol of Fig. 5041 of IEC 417.

7) In case that the long term use is considered, in some sorts of insulating materials,

if softner is vaporized at lower temperature than usual softening temperature,

attention should be paid about that electrical and mechanical property can be

deteriorated by it. Refer to Clause 2.2.2.

TTAS.KO-09.0018/R1(2004.12)53

E. Even in case that an equipment is installed in a place where access is

restricted, the limit value of the allowable temperature rise regulated in items

1 and 2 of Table 16 of Technical Standard is applied. However, if an

external metal part plays the role of a heat sink plate obviously or it has a

warning mark which can be checked visually, the temperature rise up to

65K is allowed.

F. In case that a coil is measured by a resistance tester, the temperature is

calculated by the following formulas.

t=(R2-R1)/R1×(234.5+t1)-(t2-t1) : In case of a copper wire

t=(R2-R1)/R1×(225+t1)-(t2-t1) : In case of aluminium wire

t : temperature rise value (K), R1 : Initial resistance value, R2 : Final

resistance value

t1 : Initial room temperature, t2 : Final room temperature.


<Table 16-3> Test results of temperature rise

5.1 Table : Temperature

Test voltage (V)................... 3.1.2. 180V/230V

t1( ).................................... 23

t2( ).................................... 25

Measured position of temperature

riseMeasure value (K) Reference value (K)

Noise filter (LF1) 45/50 65

Temperature of a coil R1( )Ω R2 ( )Ω dT (K)Reference

value (K)

Insulation

class

Transformer (T1) 220 250 31 75 A

TTAS.KO-09.0018/R1(2004.12)54

A. Record the measured point, the measured value, and the reference value in

the corresponding blank of "the measured position of temperature rise" in

the above test certificate form regarding the measured points by a

thermocouple.

Regarding the measured points by a resistance tester, record the related

contents in the corresponding blank of "temperature rise of a coil".

B. Record suitability in the corresponding blank in Clause 5.1 of test certificate

form.

TTAS.KO-09.0018/R1(2004.12)55

17. Leakage test

17.1 Corresponding Clause of Technical Standard : 5.2, Appendix D


To check the possibility of the electric shock of an equipment.


A. Voltage regulator : 0-250 Vac, 60 , 15 A or equivalents

B. Leakage current meter by Appendix D of Technical Standard or equivalents

C. Isolation transformer and select switch

D. Metal foil : 100cm × 200cm size

E. Power analyzer

F. True rms meter

G. Oscilloscope


Leakage current can be measured by an instrument described in Appendix

D. of Technical Standard or by consisting of the circuit which the equivalent

result can be achieved. As an equipment of Appendix D is classical, a

measuring circuit as shown in the following figure can be used in a

switching power supply part which works in high frequency on the basis of

IEC 990.

General

1) A system of interconnecting equipments connected to power individually is

tested respectively for each equipment, and a system as an interconnecting

equipment which all is connected to power commonly by connecting one to

power is regarded as one equipment.

TTAS.KO-09.0018/R1(2004.12)56

2) An equipment which can use multiple power sources is tested by

connecting to one power source.

3) By studying the circuit diagram of first class equipment as an eternal

connecting equipment or B type plug connecting equipment, in case of an

equipment whose ground leakage current exceeds 3.5 mA but obviously

does not exceed 5 % of input current, test is not necessary.

4) It is desirable that voltage applied to an equipment during the test is

applied through an isolation transformer. If it is impossible to install an

isolation transformer, an equipment should be installed on an insulated plate

and is not connected to ground, and safety treatment should be done so

that hazard voltage is not applied to a body of an equipment.

5) In case of an equipment of class II, a metal foil of 10 cm × 20 cm

contacted to a conductor part and non-conductor part which a user can

access is tested. If the area of a metal foil is smaller than the surface area

of EUT, the metal foil should be moved so as to test all surface area of

EUT. If a metal foils are jointed by using glue, the glue should be

conductive.

6) In applying voltage in test, the test is done in -10 % and +6 % of the

rated voltage or in the most disadvantageous one of the rated input voltage

range.

7) Test circuit is as shown in the following figure.

Isolation transformer

Ground terminal forequipment protection

EUT

Select switch

Tester

(Fig. 17-1) Test circuit of leakage current of a single phase equipment

TTAS.KO-09.0018/R1(2004.12)57

Isolation transformerEUT

Ground terminal forequipment protection

Tester

(Fig. 17-2) Test circuit of ground leakage current of a three-phase equipment

Measurement using a leakage current meter

1) In case of a single phase equipment, the test is done at the switches 1

and 2 respectively by using a leakage current meter as shown in Fig 13

and Fig 14 of Technical Standard.

2) When a select switch of 1) item is at each position, the switch used

usually as the one installed in an equipment which turns on and off primary

power is tested at the positions of all combination of on and off if

possible.

3) Set the range of a leakage current meter to the area of AC+DC and

measure the most precise value by gradually lowering the range.

Measurement on the basis of IEC 990

1) Measuring circuit is as follows.

Measuring terminal

TTAS.KO-09.0018/R1(2004.12)58

R1 : 1500 ,Ω R2 : 500 ,Ω R3 : 10 K ,Ω C1 : 0.22

C2 : 0.022 .

Voltmeter or Oscilloscope: Input resistor : >1 MΩ

Input capacitance : >200 pF

Frequency range : 15 up to 1 M

(Fig. 17-3) Measuring circuit by IEC 990

2) By using the above measuring circuit, measure voltage U with a voltmeter

or an oscilloscope in identical method with an leakage current meter.

Leakage current makes U/500. (If U is rms value, leakage current makes

rms value, and if U is peak value, leakage current makes peak value.)


The measured leakage current should be below the values regulated in the

following table.

<Table 17-1> Maximum allowable ground leakage current

Class EquipmentsMaximum leakagecurrent (mA)

IIIII

I

All equipmentHandheld equipmentPortable equipment (except handheld equipment)Fixed equipment and A type plug connecting device

Fixed equipment, eternal connecting device, B type plugconnecting device- The one which each condition of item 5.2.5 is notapplied- The one which each condition of item 5.2.5 is applied

0.250.753.53.5

3.55% of input current

TTAS.KO-09.0018/R1(2004.12)59


Record the measured result in the corresponding blanks of Clause 5.2 of test

certificate.

If the measured results are diverse according to manipulation of a switch,

record in details by using "Note#".

TTAS.KO-09.0018/R1(2004.12)60

18. Electric strength test



To inspect suitability of the used insulation.


A. Withstanding voltage tester : 0-5000V ac and dc, 60 or equivalents

B. Withstanding voltage tester for high voltage

C. Metal foil

D. Insulating table


A. Test it in state that an equipment is sufficiently warmed up just after a

temperature rise test.

B. In case of testing it separately after separating a part or a partial assembly

from an equipment, test it after warming up the parts or the partial

assembly as hot as it was warmed up in temperature rise test.

C. In case of thin film insulation by using supplementary insulation or

reinforced insulation regulated in Clause 2.9.4.2 of Technical Standard, the

test can be done in room temperature.

D. Test is done to inspect the suitability regarding all insulation required in

Technical Standard, and the kind of insulation to be applied is as shown in

Table 0.1.

TTAS.KO-09.0018/R1(2004.12)61

E. Test is done with the values regulated in Table 18 of Technical Standard,

and a operating voltage (U) is the value which is measured at both ends of

the measured insulating part in measurement of T6 operating voltage.

F. Apply voltage to the insulation and increase from 0 gradually, and apply the

regulated voltage for 60 seconds during the test.

G. In case of testing insulation coating, test it after attaching metal foil of the

surface of insulator. This method is applied to the a part only where

insulation can be weakened such as the part which has sharp and metallic

edge at the bottom of an insulator. If possible, test an insulating lining

separately. In case of attaching metal foil, pay attention so that flashover

will not be generated in the end of an insulator. In case of using metal foil

joined with glue, the glue should be conductive.

H. In an equipment which is using the reinforced insulation or the insulation

lower than it, attention should be paid so that over voltage is not applied to

the primary insulation and supplementary insulation by the voltage applied to

the reinforced insulation.

I. Equipotential wiring can be used by cutting the similar parts which are in a

integrated circuit or a secondary circuit to prevent the breakdown of

insulation or a part with no relation to the test.

J. If a capacitor is connected at both ends of an insulating part, it is

desirable to use DC test voltage. In case of using DC voltage, it is 2√

times of the regulated DC value.

K. Test is done after cutting the parts, such as the device of restricting

resistor or voltage for discharging of filtering capacitor, which provide DC

path in parallel with the tested insulation part.

TTAS.KO-09.0018/R1(2004.12)62

<Table 18-1> Application of insulation

Insulation class Insulation between X, Y

X Y

1. Functional

insulation

Refer to the

condition1)

SELV circuit

- Grounded conductive part

- Double insulated conductive part

- Other SELV circuit

ELV circuit


- Grounded SELV circuit

- Primarily insulated conductive part

- Other ELV circuit

Grounded secondary circuit

where hazard voltage is

applied to

- Other secondary circuit which hazard voltage

is applied to

TNV circuit



- Other TNV circuit of identical class

Series/parallel part of a coil

of a transformer

2. Primary

insulation

Primary circuit

- Grounded or non-grounded secondary

circuit where hazard voltage is applied to



- Conductive part insulated by primary

insulation

- ELV circuit

Grounded or non-grounded

secondary circuit where

hazard voltage is applied to

- Non-grounded secondary circuit where hazard

voltage is applied to




insulation

- ELV circuit

TNV circuit

- Conductive part insulated by double insulation

- Non-grounded SELV circuit



3. Secondary

insulation

Conductive part and ELV

circuit insulated by primary

insulation


- Non-grounded ELV circuit

TNV circuit


insulation

- ELV circuit

4. Secondary or

reinforced

insulation

Non-grounded secondary

circuit where hazard voltage

is applied to



- TNV circuit

TTAS.KO-09.0018/R1(2004.12)63

5. Reinforced

insulation Primary circuit



- TNV circuit

Grounded secondary circuit

where hazard voltage is

applied to



- TNV circuit

* Note 1) In the regulation regarding functional insulation, refer to Clause 5.4.4 of Technical

Standard.

<Table 18-2> Withstanding voltage for test (1)

Test voltage2)(Vrms)

Voltage applying points (corresponding blanks)

Between primary and body

Between primary and secondary

Between primary circuits

Between secondary

and body

Between the

secondary circuits3)

Operating

voltage

Insulation

class

U 184V≤

Peak

value or

DC 6)

184V U＜

354V≤

Peak

value or

DC 7)

354V U＜

1.41KV≤

Peak

value or

DC

1.41KV U＜

10KV≤

Peak

value or

DC 8)

10KV U＜

50KV≤

Peak

value or

DC

U 42.4V≤

Peak

value or

DC 60V

Peak

value

42.4V or

DC 60V

U 10KV＜ ≤

Peak

value or

DC

Functional

insulation1)

1,000 1,500

Refer to

Va of

Table 18

(2)

Refer to

Va of

Table 18

(2)

1.06U 500

Refer to

Va of

Table

18(2)

Primary

insulation

Supplement

ary

insulation

1,000 1,500

Refer to

Va of

Table 18

(2)

Refer to

Va of

Table 18

(2)

1.06U N/A

Refer to

Va of

Table

18(2)

Reinforced

Insulation2,000 3,000 3,000

Refer to

Va of

Table 18

(2)

1.06U N/A

Refer to

Vb of

Table

18(2)

TTAS.KO-09.0018/R1(2004.12)64

Conditions which can be applied to Table 18-2 :1) Usual or functional insulation is not tested except the case of Clause 5.4.4 (b).

2) Test voltage is applied to a solid insulator regardless of altitude. In case of spacedistance, the withstanding voltage can be decreased to the voltage multiplied bycoefficient as follows, according to altitude.

Altitude (m) Above sea level (0) 500 1000 2000

Coefficient 1 0.94 0.89 0.79

3) The value regulated for a primary circuit is applied to the part whose operatingvoltage exceeds 10 KV (AC peak value or DC) in a secondary circuit.

4) In this voltage, Vb is calculated by Vb = 155.86U0.4683, not 1.6 Va.

5) Regarding the value between adjacent blanks in the table, interpolation can be used.

6) In case of DC power supply of less than 130 V, use this blank.

7) In case of DC power supply of 130 V - 250 V, use this blank.

8) In case of DC power supply of over 250 V, use this blank.

Note - Conditions of 6 to 8 are applied in case of DC power supply, and these threeconditions are not applied in case of DC power supply that converts AC power in side of anequipment.

TTAS.KO-09.0018/R1(2004.12)65

<Table 18-3> Test voltage of withstanding voltage (rms voltage)

Upeak or DC

Varms

Vbrms

Upeak or DC

Varms

Vbrms

Upeak or DC

Varms

Vbrms

343536384042444648505254565860626466687072747678808590951001051101151201251301351401451501524)1554)1604)1654)1704)1754)1804)184185190200210220230240

500507513526539551564575587598609620630641651661670680690699708717726735744765785805825844862880897915931948964980995100010001000100010001000100010001097111111371163118912141238

800811821842863882902920939957974991100810251041105710731088110311181133114711621176119012241257128813191350137914081436146314901517154215681593160016171641166416881711173317511755177718201861190219421980

2502602702802903003103203303403503603804004204404604805005205405605805886006206406606807007207407607808008509009501000105011001150120012501300135014001410145015001550160016501700

126112851307133013511373139414141435145514741491153215691605164016741707174017721803183418641875189319221951197920062034206020872113213821642225228523432399245425082560261126612710275828052814286829343000306531303194

201820552092212721622196223022632296232823592390245125102567262326782731278428352885293429823000300030003000300030003000300030003000300030003000300030003000300030003000300030003000300030003000300030003000306531303194

17501800190020002100220023002400250026002700280029003000310032003300340035003600380040004200440046004800500052005400560058006000620064006600680070007200740076007800800082008400860088009000920094009600980010000

325733203444356636853803392040344147425943694478458646934798490250065108520953095507570258946082626864526633681169877162733475047673784080058168833084918650880789649119927394256577972798761002410171103171046310607

325733203444356636853803392040344147425943694478458646934798490250065108520953095507570258946082626864526633681169877162733475047673784080058168833084918650880789649119927394259577972798761002410171103171046310607

TTAS.KO-09.0018/R1(2004.12)66


A. Insulation breakdown should not be caused during the test.

B. When test voltage is applied, if current increases rapidly beyond control,

that is, if insulation can not limit the current to less than certain value, it is

regarded as insulation breakdown. Corona discharge or instant flashover is

not regarded as insulation breakdown.

C. A withstanding voltage tester has a function of cut-off current setting. Set

cut-off current to the low current of 5 mA and conduct the test when

applying initial test voltage. If N.G. happens in this current, apply test

voltage by gradually increasing the current again (ex: 5 TM10TM20TM100

). If N.G. happens even in the range of maximum current, it is regarded

that insulation breakdown happens.


<Table 18-4> Withstanding voltage test results

5.3 Table : Electric withstanding Voltage test

Applying points of test voltage Test voltage (V) Insulation breakdown

Primary and secondary(reinforced insulation)

300Vac No

Primary circuit and chassis(primary insulation)

1500Vac No

A. Applying point of test voltage : Record the point where the test is done.

B. Test voltage : Record the test voltage including DC and AC.

C. Insulation breakdown : Record as "breakdown“ or "no".

Record suitability in the corresponding blank of Clause 5.3 of test certificate.

TTAS.KO-09.0018/R1(2004.12)67

19. Abnormal test

19.1 Corresponding Clause of Technical Standard: 5.4


To check the possibility of hazard of fire and electric shock etc. due to the

state or the trouble of mechanical or electrical over load of a part, or

malfunction of product, mistake during operation in the circuit.


A. Voltage regulator : 0 - 250Vac, 60 , 15A or equivalents


C. Electronic load or proper load device

D. Switch for test

E. Temperature recorder, coil resistance tester.

F. Multimeter


A. Motor : T38. Decide by motor test in abnormal state.

B. Transformer : T20. Decide by test of abnormal state of a transformer.

C. Functional insulation : One of the following three conditions should be

satisfied.

- To be suitable to the regulation of creepage distance and space

distance regulated in Clause 2.9 of Technical Standard.

- To endure in the withstanding voltage of Clause 5.3.2 of Technical

Standard.

- To satisfy an abnormal state test.

TTAS.KO-09.0018/R1(2004.12)68

D. Electric and mechanical part : The following tests are applied for the

electric parts, which may involve some risk, except the motor in the

secondary circuit.

Interrupt a mechanical operating part at a most disadvantageous①

position in state that power is applied to a part in normal state.

In case of a part which power is applied to intermittently, continue to②

apply power to the part after causing a trouble to a driving circuit.

Test time :③

- If the trouble state of an equipment or a part is obviously not

notified to a user: The shorter time of the time until normal state is

reached and the time until a circuit is broken as the result that

trouble state is simulated.

- Other equipment or part : The shorter time of 5 minutes and the

time until a circuit is broken as the result that trouble of a part(ex:

wire break) or trouble state is simulated.

E. Regarding other part and circuit except the above item, conduct the test

according to the methods as follows.

Simulate the following trouble state.①

- Trouble of an arbitrary part used in primary circuit.

- Trouble of a part which can cause bad influence on supplementary

insulation and reinforced insulation due to trouble.

- Trouble of all parts regarding an equipment which is not suitable to

Clause 4.4.2. and 4.4.3 of Technical Standard.

- Trouble caused by connecting a load impedance which is mostly

disadvantageous to a terminal where output power or signal output

comes from the equipment, and to a connecting device (except an

outlet for power).

TTAS.KO-09.0018/R1(2004.12)69

If several outlets are connected to an internal circuit, the test can be②

done for only one outlet.

In case of a part used in a primary circuit integrated with a power③

such as a power cord, a connecting device for an equipment, a part

for EMC filter, a switch, and a wire interconnecting between

equipments, the trouble state is not simulated if creepage distance and

space distance regarding functional insulation are suitable.

Test can be done by using an actual circuit used in an equipment or④

a simulation circuit, and test can be done by separating a part or a

partial assembly from an equipment.

Test is done in all state expected during usual test and in state of the⑤

expected misuse.

Regarding an equipment with an additional protecting cover, test is⑥

done until normal state is reached after fixing the cover at right

position in state of normal no-load.

F. As an equipment operated with no operator, test as follows is done to an

equipment with an automatic temperature controller, a temperature limiter,

over heat preventing device, or an equipment with a capacitor which is not

protected with a fuse connected to a contact in parallel.

- An automatic temperature controller, a temperature limiter, or over heat

preventing device : T40. Temperature controller test should be satisfied.

- Operate the equipment in the condition regulated in temperature rise

test, and then short the temperature limiting device. In case of an

equipment with over 2 of automatic temperature controllers, temperature

limiters, or over heat preventing devices, short the devices one by one.

- In case that the current is not cut off, turn off the equipment as soon

as it reaches the stable state and cool it down to room temperature.

TTAS.KO-09.0018/R1(2004.12)70

- Test time of an equipment with the rating of short time operation is

same as the rated operating time.

- In case of an equipment with short time operation or rating of

interruptive operation, repeat the test until it reaches to the stable state

regardless of rated operating time. In this test, do not short an

automatic temperature controller, a temperature limiter, or over heat

preventing device.

- During any test as mentioned above, in case that the current is

interrupted before an equipment reaches stable state by operation of an

over heat protecting device of manual reset type or by other method,

operating time continues to that time. However, in case that the current

is interrupted by bursting at a part which is weakened intensionally,

repeat the test with another EUT. Both of the 2 tests should satisfy the

condition regulated in standard of suitability.

Example of test part for short/open in general

Rectifier, diode, transistors, triacs, SCR junctions, integrated circuit pin, EL-capacitors.

TTAS.KO-09.0018/R1(2004.12)71

(Fig. 19-1) Example of abnormal state test


A. The temperature of a transformer providing power to a part under test

should not exceed the value regulated in Appendix C1 of Technical

Standard, and in this case, exceptional items regulated in Clause C2 should

be considered.

B. In case that fire breaks out, flame should not be expanded out of the

equipment.

TTAS.KO-09.0018/R1(2004.12)72

C. Melted metal should not flow out of the equipment.

D. There should not be transformation of an equipment which does not satisfy

protection of user access area, regulation on ground, space distance, and

requirements for stability and mechanical hazard.

E. Regarding an equipment which is not suitable to Clause 4.4.2 and 4.4.3 of

Technical Standard, when the test is done in state of trouble of all parts, in

case of an equipment which does not satisfy Clause 4.4.2 and 4.4.3, as

other regulation is not made, the temperature rise of insulation materials

except thermoplastic materials should be less than 125 K in case A class

insulator, 140 K in case of E class, 150 K in case of B class, 165 K in

case of F class, and 185 K in case of H class.

F. Regarding above E. item, although bad insulation is caused, in case that an

user can not access the part where hazard voltage is applied to or the part

where hazard energy exists, the high limit of the insulator can be regulated

as less than 300 . In case of glass or ceramic materials, it can be regulated

as higher.

G. After each abnormal state test is done, conduct withstanding voltage test

regarding the following parts.

- Reinforced insulation : Or

- Primary insulation or supplementary insulation forming dual insulation; or

- Primary insulation installed between a primary circuit of 1 class equipment

connecting to A type plug and a conductive part which a user can

access : Or

- In case that space distance or creepage distance decreases to less than

the value regulated in Clause 2.9 of Technical Standard : Or

- In case of that damage, which can be checked visually, happens in

insulating part : Or

- In case that the insulating part can not be inspected.

TTAS.KO-09.0018/R1(2004.12)73


<Table 19-1> Test result of abnormal state

5.4 Table : Abnormal state test

Ambient temperature ( ) : 23

Model of power supply type : PWR300Ⅰ

Manufacturer of power supply : Korea Testing Co., Ltd.

Rating of power supply : 220V, 50 , 2A

No.Part

No.

Trouble

mode

Test

voltage

(V)

Test

time

Fuse

no.

Fuse

current

(A)

Result

1 C301 S/C 233 1 Hr F1 2.5

Normal operation,temperature oftransformer : stableat 100'C

2 D101 O/C 233 10 Min F1 0.8 No operation

Remarks

S/C : Short Circuit, O/C : Open Circuit, Hr : Hour, Min : Minute.

1) Record test result in detail in a supplementary table of a test certificate as

shown in the above example. Record symptoms of an equipment in the

simulated trouble and contents of trouble in other parts, etc. after test.

2) Record test result in the related item of Clause 5.4 of a test certificate

form.

TTAS.KO-09.0018/R1(2004.12)74

20. Transformer abnormal test

20.1 Corresponding Clause of Technical Standard : 5.4.3. Appendix C1.


To check the possibility of hazard of fire and electric shock etc. due to

implemental or electrical overload or trouble, and mistake during operation.


A. Power supply of AC 0-250V, 60 , 15A or equivalents

B. Electronic Load

C. Variable resistor

D. Ammeter

E. Temperature reorder and thermocouple

F. Coil resistance tester

G. Multi meter


A. Test is done on a test table which simulates the inside of an equipment or

the condition of the inside of an equipment.

B. After checking EUT and a circuit diagram, fix a thermocouple between coils

of a transformer which is expected as hottest.

C. In case of linear power supply : Run a transformer and short each coil in

state that maximum rated load presented by the manufacturer is applied to

all secondary coils.

TTAS.KO-09.0018/R1(2004.12)75

Primary power

(Fig. 20-1) Test method of abnormal state of a transformer

(Example : Observe the result after applying maximum rated load to Lo1

and shorting A point of a lower coil. Again, observe the result after

applying maximum rated load to Lo2 and shorting A point of a upper coil.)

D. In case of ferro-resonant type : Conduct the test by applying the most

disadvantageous load to each secondary coil alternatively. Load should be

selected with most disadvantageous value of the following factors to induce

maximum temperature rise.

- Primary voltage, input frequency, load up to maximum rated load in no-load

of other coil.

E. Switching power source : Run a transformer in maximum rated load, and

apply load individually behind a rectifier (front of a regulator). Adjust load

until maximum VA output is induced or to the point just before foldback.

(In above figure of C item, gradually increase the load tap by tap at B

point in state that maximum rated load is connected to Lo1 and Lo2. While

running the transformer at the higher load of the load value whose

maximum VA is achieved or the load value just before foldback, measure

the temperature and observe the state.

F. Test time is as follows.

TTAS.KO-09.0018/R1(2004.12)76

- A transformer with external over current protecting device : Until the

protecting device starts to work.

- A transformer with overheat preventing device of automatic reset type :

The time regulated in Appendix C1 of Technical Standard, or after 400

hours.

- A transformer with overheat preventing device of manual reset type : Until

the overheat preventing device starts to work.

- Current limit transformer : Until temperature become stable.


The measured temperature value should not exceed the limit value described

in Appendix C1 of Technical Standard.

<Table 20-1> Allowable temperature of a transformer coil ( )

Maximum allowable temperature ( )

A class E class B class F class H class

Protection by proper impedance or

external impedance150 165 175 190 210

Protection by a protecting device working

within 1 hour200 215 225 240 260

Protection by other protecting devices

- Maximum value after 1 hour

- Arithmetic average value within 2 hours

and 72 hours

175

150

190

165

200

175

215

190

235

210

Arithmetic average temperature is decided as follows.

While power for a transformer turns on and off repeatedly, draw the graph of

temperature for the time during test cycle. Arithmetic average temperature ( )

is calculated as follows.

TTAS.KO-09.0018/R1(2004.12)77

Here, tmax is the average of maximum values, and tmin is the average of

minimum values.

Time

Maximum value

Minimum value

(Fig. 20-1) Calculation of arithmetic average temperature.

20.6 Preparation of a test certificate

A. Record the decision of suitability in the Clauses 5.4.3 of a test certificate

form.

B. Record test results in the corresponding blank of the Clauses C of a test

certificate form, and record the detailed test result in the supplementary

Table 5.4 or by using "Note#".

TTAS.KO-09.0018/R1(2004.12)78

21. Ball pressure test



To check if thermoplastic part, which is installed directly at the part where

hazard voltage is applied, endures abnormal temperature.


A. Ball pressure tester (by figure 21 of Technical Standard)

B. Temperature control chamber 0 - 200：

C. Vernier calipers or proper measuring device


A. Take EUT by cutting a part of thermoplastic part which is installed directly

at the part where hazard voltage is applied (mainly a transformer, a bobbin

of noise filter, or connectors).

Thermoplastic and thermosetting

A. Thermoplastic

It means all plastics which are softened if heated, and hardened if cooled, and①show plasticity (chocolate if likened to cake).

In heating process, occasionally oxidation reaction causes thermal degradation, but②intrinsic structure of molecule is not changed.

Principle of molding process means a series of processes of making material③softened by heating and then putting it in a mold with a shape and making asolidified product by cooling it rapidly.

TTAS.KO-09.0018/R1(2004.12)79

Generally, it has lower solvent resistance and thermal strain temperature than④thermosetting.

Representative thermoplastic:⑤

PE, PP, PS, PVC, PC, polyamide, ABS, PMMA, poly acetal - Poly oxymethylene, PET,PBT, PPS.

B. Thermosetting plastic

It is made in low molecule substance before solidification, and it shows fluency at①room temperature or by heating, and is reacted chemically by hardener, catalyst, orheat, and finally change to solid resin of insolubility (Chocolate if likened to cake).

Generally, it is used for industrial material or food since it has good thermal②resistance, chemical resistance, high solidity, and has good mechanical and electricalproperty.

Representative:③Phenolic, epoxy, melamine, unsaturated polyester, urea resins, silicon, polyamide,diaryl phthalate.

B. Put thermoplastic insulating part in a temperature chamber and fix the

surface horizontally, and press the surface with a strong ball of outer

diameter 5 by force of 20 N.

Note : Before the test, heat the a ball pressure tester up to 125 first in a

temperature chamber and put it on EUT.

C. A temperature chamber should be set to 40±2K higher than maximum

measured temperature value of temperature rise test. However, thermoplastic

insulation part supporting a part where primary power is applied is tested

at minimum 125 .

D. After one hour, put out EUT, and cool it down to room temperature within

10 seconds by putting it in cool water.

TTAS.KO-09.0018/R1(2004.12)80

Ball

EUT

(Fig. 21-1) Ball pressure tester


Outer diameter of a dented trace should not exceed 2 .


<Table 21-1> Ball pressure test results

5.4.10 Table: Ball pressure test of thermoplastic

Reference outer diameter( ) 2≤

Test point

Test

temperature

( )

Outer diameter of the

dented trace ( )

Bobbin of a transformer T1, KTL Co., Ltd,type THP-1, Polyamide

125 1.2

Record test results in detail in the supplementary Table 5.4.10 of a test

certificate form, and record decision in Clause 5.4.10.

TTAS.KO-09.0018/R1(2004.12)81

22. TNV voltage measurement test

22.1 Corresponding Clause of Technical Standard : 6.2.1.1.


To check if the voltage which is generated in a circuit connected to a

communication network is the safe value as required in Technical Standard.


A. Voltage regulator : 0-250Vac , 60 , 15A or equivalents


C. Resistor 5 ±2%


A. Connect an equipment to the more disadvantageous voltage of the rated

input voltage and -10% or +6% of rated input voltage, and run it.

B. In a separate TNV circuit or an interconnected TNV circuit, measure the

voltage between two conductors of TNV circuit or other circuit or between a

conductor and a ground. In case that DC and AC are coupled, measure

and record DC value and AC value separately.

Measurement example :

SELV orother circuit

TNV circuit

(Ex: Tip)

(Ex: Ring)

(Ground)

(Fig. 22-1) Measuring point of TNV voltage measuring test

TTAS.KO-09.0018/R1(2004.12)82

Measure the voltage between A and B, A and C, B and C.

C. After simulating single trouble state at the same point as above B. item,

connect a resistor of 5 ±2% and measure the voltage. Single trouble

means the state that an insulating part or the part which is primary or

supplementary insulation except reinforced insulation is shorted or opened.


A. Voltage is decided by the division of TNV circuit presented in the following

table.

<Table 22-1> Division of TNV circuit

Voltage generated during normal operating state

Possibility of overvoltage

from communication

network?

Voltage less than the

allowable value regulated as

SELV circuit

Voltage which exceeds the

allowable value regulated as

SELV circuit, but is less than

the allowable value regulated

as TNV circuit.

Yes TNV-1 circuit TNV-3 circuit

No SELV circuit TNV-2 circuit

B. TNV-1 circuit

- A measured value in normal operating state by the above test method B.

should not exceed the regulated value of SELV (42.4V peak value, 60 V

dc).

- A measured value in troubled state by the above test method C. should

not exceed the limit value regulated in Fig. 15 of Technical Standard.

TTAS.KO-09.0018/R1(2004.12)83

C. TNV-2 circuit and TNV-3 circuit

A measured value in normal operating state by the above test method B.

exceed the regulated value of SELV but should not exceed the following

value.

- In case of voltage except telephone call signal (bell sound signal) :

The value in normal operating state by the above test method C. should①

satisfy the following formula.

Uac : Peak AC voltage value in arbitrary frequency (V)

Udc : DC voltage value (V)

A voltage and single trouble state by the above test method C. should②

not exceed the limit value regulated in Fig. 15 of Technical Standard.

- In case of telephone call signal (bell sound signal) : Should satisfy T23.

telephone call signal test.

Time T(ms)

VoltagePeak value

U (unit V)T (unit ms)To=1ms

TNV limit

(refer to item 6.2.1.1)

400V peak value or

DC

In case of

(Fig. 22-1) Allowable voltage after single trouble　

TTAS.KO-09.0018/R1(2004.12)84


Record brief test result in the corresponding blank of 6.2.1.1 of a test

certificate form, and record the detailed test result by using "Note#".

TTAS.KO-09.0018/R1(2004.12)85

23. Telephone ringing signal test

23.1 Corresponding Clause of Technical Standard : 6.2.1.1, Appendix M


To inspect if telephone call signal (Bell sound signal) has safe value which

does not cause electric shock to human body.


A. Voltage regulator : 0.250Vac, 60 , 15A or equivalents


C. Resistor 5


By selecting one of two methods described as follows, call signal can comply

with the methods of each nation over the world. Method A is a typical analog

telephone network used in Europe, and method B is a typical analog telephone

network used in North America. The two methods originated from technical

standard regarding electric safety can be regarded as identical in a broad

sense.

Method A

1) Observe wave form shown at resistor 5 between two arbitrary wires of TNV

circuit which is generating call signal or between arbitrary phase line and

ground wire, and calculate a value as follows.

TTAS.KO-09.0018/R1(2004.12)86

- Ip, Ipp, Idc

- , .

OscilloscopeTNVcircuit

(Fig. 23-1) Example of measurement

(Fig. 23-2) Waveform measured by an oscilloscope (peak, or peak to peak current)

(Fig. 23-3) Definition of call time and melody call cycle

* :

- In case that a call is sent out totally for 1 signal cycle, cycle time for 1 call

signal.

- In case that 1 call cycle includes over 2 dispersed calls, sum of call signals

during 1 call cycle, . in above figure.

* : Time of 1 circular cycle of full melody call.

TTAS.KO-09.0018/R1(2004.12)87

2) Calculate and on the basis of the following formulas.

I① TS1 is an rms value decided by a measured or a calculated value during

arbitrary 1 call signal cycle .

* Ip, Ipp : Refer to Fig. M.3 (unit, mA), : Refer to Fig. M.1 (unit: ms).

I② TS2 is an average value regarding a repeated call of melody call sound

signal calculated by 1 melody call sound time .

;

Method B

This is the method added with the regulation on trouble state on the basis of

chapter 68, Clause D of CFR47 (FCC Regulation), USA.

1) Configure a test circuit as the following figure.

OscilloscopeTNVcircuit

(Fig. 23-4) Block diagram of test

TTAS.KO-09.0018/R1(2004.12)88

2) Select A and measure values as follows by using an oscilloscope in state

that call sound is applied.

- Frequency

- Peak to peak voltage

- Peak to ground voltage

- Time of call sound signal

- Time between call sound and pause

3) Select B and measure values as follows by using an oscilloscope in state




- Convert the measure voltage into current

4) Select C and measure values as follows by using an oscilloscope in state




- Convert the measure voltage into current

5) Test in trouble state :

When a resistor of 5 is connected to the points as follows, measure①

peak to peak voltage and convert it into current.

- Between two arbitrary wires

- Between an arbitrary wire and ground

TTAS.KO-09.0018/R1(2004.12)89

In state of connection as follows, measure peak to peak voltage and②

convert it into current.

- When output wires are combined together

- When an arbitrary wire is grounded


Method A:

1) should not exceed the following values.

- In case of melody call ( ), the current marked by a curve of Fig. M.2

of Technical Standard regarding time .

- In case of sequential call ( ), 16 mA or 20 mA when melody call is

sequential in single trouble.

2) should not exceed 16 mA(rms).

Method B:

1) Frequency of call sound signal should be less than 70 .

2) In signal voltage measured in the above test method, peak to peak voltage

should be less than 300V, and peak ground voltage should be less than 200

V.

3) In calling, signal voltage should not exceed 5 seconds and should be

interrupted for at least 1 second by giving time of pause. Voltage during the

pause should not exceed 56.5V.

4) According to the following conditions, an interrupting device or signal voltage

for monitoring should be provided.

TTAS.KO-09.0018/R1(2004.12)90

- If current measured at C position is less than 100 mA (peak to peak), a

device does not need installing, and signal voltage for monitoring does not

need applying.

- If current measured at B position exceeds 100 (peak to peak), an

interrupting device should be installed, and if it satisfies a regulation on

interruption regulated in Fig. M.4 of Technical Standard, signal voltage for

monitoring does not need applying. If an interrupting device does not satisfy

the regulation at C position but does satisfy the regulation on interruption at

B position, signal voltage for monitoring should be applied.

- In case that current at C position exceeds 100 mA but current at B position

is less than 100 mA, one of followings should be done.

To install an interrupting device satisfying regulation on interruption①

regulated in Fig. M.4 at C position.

To apply signal voltage for monitoring.②

Interrupting device

An interrupting device of DC detecting type which is connected to a ring lead

in series which interrupts call sound according to regulation of Fig. M.4 of

Technical Standard.

Signal voltage for monitoring

Ground voltage of a part of tip or ring. This voltage is over 19 V (peak) or

below DC 56.5 V in state that call signal voltage is not applied.

5) In state of trouble in the above test method 5),

- Current as a result of should be less than 20 (rms)①

- Current as a result of should be less than 500 (rms)②

TTAS.KO-09.0018/R1(2004.12)91

Signalsourcefor call

Interruptingdevice

Maximum interrupting time t (sec)

Current

1 t is gained by measuring connecting time of resistance R of a circuit.

2 At slope of curve, l =100/ .

(Fig. 23-5) Interruption of call sound signal


Record decision in Clause 6.2.1.1 b) of a test certificate form, and record the

test result in detail by using "note #".

TTAS.KO-09.0018/R1(2004.12)92

Time

Current

Note - This curve refers to the curve b in IEC479-1 Fig.5

(Fig. 23-6) ITS1 permission of melody call sound signal

TTAS.KO-09.0018/R1(2004.12)93

24. Operating voltages generated externally for TNV-2 and TNV-3 circuit

24.1 Corresponding Clause of Technical Standard : 6.2.1.3, 6.2.1.2


This test is required as one of indispensible conditions instead of primary

insulation when regulation of insulation between SELV, TNV-1 circuit and an

accessible conductive part and TNV-2, TNV-3 circuit is applied on the basis

of Clause 6.2.1.2 of Technical Standard.


A. Test voltage generator : internal impedance-1200 ±2%, frequency-50/60 ,Ω

voltage- 120±2V A.C.


C. True rms meter

D. Stop watch


A. The cases that test is required.

Regarding TNV-2 and TNV-3 circuits in state of normal operating, in single

trouble, the insulation between SELV, TNV-1 circuit, an accessible

conductive part and TNV-2, TNV-3 circuit should not exceed the allowed

value regulated in Clause 6.2.1.1 of Technical Standard, and if the

insulation described in Table 19 as shown below is done, it is regarded as

satisfied.

And if all of the following conditions are satisfied in case of primary

insulation, test is not required.

TTAS.KO-09.0018/R1(2004.12)94

- According to Clause 2.5 of Technical Standard, SELV, TNV-1 circuit and

an accessible conductive part are connected to a protecting ground

terminal, and

- An installation manual says that a protecting ground terminal should be

grounded eternally, and

- If TNV-2 or TNV-3 circuit is designed to receive signal or power which

exceeds the allowable value of Clause 2.3.2 regarding SELV from a

connected equipment or to receive signal or power which are generated

outside, the test should be done.

<Table 24-1> Insulation required for TNV circuit

Parts to insulate Insulation

SELV circuit or accessible

conductive part

TNV-1 circuit

TNV-2 circuit

TNV-3 circuit

6.4.1 item

Primary

Primary and 6.4.1 item

TNV-1 circuit

TNV-2 circuit

TNV-1 circuit

TNV-2 circuit

TNV-3 circuit

TNV-3 circuit

Primary

6.4.1 item

Primary

TNV-1 circuit

TNV-2 circuit

TNV-3 circuit

TNV-1 circuit

TNV-2 circuit

TNV-3 circuit

Functional insulation



B. Regarding test voltage, use a test voltage generator appointed by the

manufacturer. If there is no appointed specification, use a test voltage

generator described in A. item of test instruments as shown above.

C. Connect a test voltage generator with terminals for communication network

of an equipment. Connect one phase of a test voltage generator with a

ground terminal of an equipment.

TTAS.KO-09.0018/R1(2004.12)95

D. Apply test voltage for maximum 30 minutes. If bad influence does not show

obviously, the applying time can be shortened.

E. Measure the voltage generated at SELV, TNV-1 circuit or an accessible

conductive part in state that a test voltage is connected.

F. Repeat the test by changing polarity of a voltage generator and connecting

with terminals of network.

Communication networkconnection terminal

Sampleundertest Test voltage

generator

(Fig. 24-1) Test voltage generator


Voltage measured on the basis of E. item of above test method should not

exceed 42.4 V of allowable value of SELV in normal state or 60V D.C.


Record brief test result and the decision of suitability in the Clauses 6.2.1.3

and 6.2.1. of a test certificate form, and record the detailed value by using

"Note#".

TTAS.KO-09.0018/R1(2004.12)96

25. Separation of the telecommunication network from earth

25.1 Corresponding Clause of Technical Standard : 6.3.3.1


In estimating insulation performance of a circuit designed to connect with

electric network and a part or a circuit which is grounded in an equipment or

through other device by withstanding voltage test, if the test is done by

removing parts as a surge absorbing device (except the capacitor) which is

used across this insulation in withstanding voltage test, this test should be

done additionally.


A. Voltage regulator : 0-250V ac., 60 , 15A or equivalents

B. A.C. ammeter (unit )

C. Resistor 5


A. In state that parts which are used across insulation are installed, apply the

rated voltage of an equipment or high voltage within the range of the rated

voltage to the test circuit as shown below.

TTAS.KO-09.0018/R1(2004.12)97

Parts which connect withinsulating part crossly(ex: surge absorber)Power connecting

part (No connection)

Sample under test

Protecting groundconnecting partor Protectinggroundconnecting pointor Protectinggroundconnecting circuitconnecting part

R a t e dvoltage

Insulation

Communication networkconnecting part(No connection)

(Fig. 25-1) Test on insulation between communication network and ground

B. Measure the current flowing between circuits connecting ground and

communication network by using an A.C. ammeter.


Current flowing in a test circuit should be lower than 10 mA.


Record the test result and the decision of suitability in corresponding blanks of

the Clauses 6.3.3.1 and 6.3.3.2 of a test certificate.

TTAS.KO-09.0018/R1(2004.12)98

26. Leakage current to a telecommunication network



To inspect if the leakage current generated in main power source and flowing

in communication network has safe value which does not cause hazard of

electric shock.


A. Voltage regulator : 0-250Vac, 60 , 15A or equivalents

B. Leakage current meter of Appendix D of Technical Standard or equivalents

C. Isolation transformer and select switch

D. True rms meter

E. Oscilloscope


A. This test is not applied to an equipment where a circuit connected to

communication network is connected to the ground terminal.

B. Regarding an equipment that more than one circuit are connected to

communication network, test is applied to just one of circuits of each type.

C. Test method and an measuring instrument is same as the contents

described in T17. leakage current test except those described in this test

method.

D. In case of a single phase equipment, test circuit is as the following figure;

TTAS.KO-09.0018/R1(2004.12)99

Isolationtransformer Sample under test


Powersource

Instrument byAppendix D

(Fig. 26-1) Test circuit on leakage current induced to communication network

(single phase equipment)

And the test is done regarding all combination (switch S1) of normal and

opposite polarity of a power circuit and all combination (switch S2) of a

circuit connected to communication network.

Measure and record leakage current according to the positions of each

switch.

In case of class II equipment, do not include the part marked by a dotted

line in a test circuit.

TTAS.KO-09.0018/R1(2004.12)100

E. In case of 3-phase equipment, test circuit is as follows.

Isolationtransformer

Sample under test


Powersource

Instrument byAppendix D

(Fig. 26-2) Test circuit on leakage current induced to communication network

(3-phase equipment)

And conduct the test regarding normal and opposite polarity of a circuit

connected with communication network (switch S2).

In case of class II equipment, do not include the part marked by a dotted

line in a test circuit.


The measured leakage current value should not exceed 0.25 mA.


Record the test result in Clause 6.3.4.1 of a test certificate, and make the

decision of suitability.

TTAS.KO-09.0018/R1(2004.12)101

27. Impulse test for TNV circuits

27.1 Corresponding Clauses of Technical Standard : 6.4.2, 6.4.2.1


To estimate insulation performance between specific parts of TNV-1 or TNV-3

circuit and an equipment.

(This test can be substituted with withstanding voltage test.)


A. Impulse test instrument by Appendix N of Technical Standard

B. Metal foil

C. Storage oscilloscope.


A. Specific parts requiring TNV-1 or TNV-3 circuit and test are as follows.

a) Non-conductive part and non-grounded conductive part of an equipment

which can be touched and contacted when it is used normally as a

transmitter and a transceiver of a telephone or a keyboard.

b) Parts and circuit which contact a test finger of Fig. 19 of Technical

Standard except a connecting point of a connector which is not

accessible with a test probe of Fig. 16 of Technical Standard.

c) Circuit provided for connection with other equipment. This regulation is

applied regardless of access of circuit. This test is not applied to a

circuit designed to connect with other equipment suitable to Clause 6.4,

as it is.

TTAS.KO-09.0018/R1(2004.12)102

B. Test circuit is as follows.

PowerConnecting part(No connection)


Protectingground

Connecting(a) and (c) only

Test voltagegenerator

Metalfoil

Plastic part

(Fig. 27-1) Test voltage applying method

C. Instead of overall test of an equipment, this test is allowed to be applied

to the parts provided to satisfy the requirements of insulation obviously. In

this case, the parts should not be bypassed by other parts, an installed

equipment or wiring. If these parts or wiring comply with the requirements

of insulation of Clause 6.4 of Technical Standard, the test is not required.

D. All conductive lines designed to connect with communication network

including arbitrary electric wire required to connect with ground by

communication network authority should be tied up together. (Refer to the

above figure.) Likewise, in case of c), all conductive lines designed to

connect with other equipment are tied up together.

E. Apply A.C. impulse to electric insulation by using an impulse generator of

Appendix N of Technical Standard. Apply impulse every 60 seconds. Initial

voltage value Uc is as follows.

- In case of a) of item 1) : 2.5 kV

- In case of b) and c) : 1.5 kV

TTAS.KO-09.0018/R1(2004.12)103


A. When test voltage is applied, if current increases rapidly beyond control,

that is, if insulation can not limit the current to lower than certain value, it is

regarded as insulation breakdown.

B. In case that a surge absorber works during the test (or spark-over is

generated in gas discharging tube) :

- In case of the above test method of A), a), it is regarded as unstable.

- In case of the above test method of A), b) and c), it is allowed.

C. Check the damage of insulation by testing insulation resistance. In case

that D.C. 500 V or a surge absorber is used, test voltage should be D.C.

voltage of 10 % lower than the operating voltage of a surge absorbing

device or striking voltage. Insulation resistance should be more than 2 ,

and the surge absorber can be separated in measuring insulation

resistance.

D. Operation of a surge absorber or breakdown of an insulated part can be

decided by other method or by measuring waveform of an oscilloscope.

(Refer to Appendix S of Technical Standard regarding check of breakdown.)


Record the test result and the decision of suitability in the corresponding blank

of Clause 6.4.2.1 of a test certificate.

TTAS.KO-09.0018/R1(2004.12)104

28. Electric strength for TNV circuits

28.1 Corresponding Clauses of Technical Standard : 6.4.2, 6.4.2.2


To estimate insulation performance between specific parts of TNV-1 or TNV-3

circuit and an equipment. (This test can be substituted by Impulse test.)


A. Withstanding voltage instrument : 0 - 5 ac/dc.　

B. Metal foil


A. Specific parts requiring test with TNV-1 or TNV-3 are as follows.

a) Non-conductive part and non-grounded conductive part of an equipment

which can be touched and contacted when it is used normally as a

transmitter and a transceiver of a telephone or a keyboard.

b) Parts and circuit which contact a test finger of Fig. 19 except a

connecting point of a connector which is not accessible with a test probe

of Fig 16 of Technical Standard.

c) Circuit provided for connection with other equipment. This regulation is

applied regardless of access of circuit. This test is not applied to a

circuit designed to connect with other equipment suitable to Clause 6.4,

as it is.

TTAS.KO-09.0018/R1(2004.12)105

B. Instead of overall test of an equipment, this test is allowed to be applied

to the parts provided to satisfy the requirements of insulation obviously. In

this case, the parts should not be bypassed by other parts, an installed

equipment or wiring. If these parts or wiring comply with the requirements

of insulation of Clause 6.4 of Technical Standard, the test is not required.

C. All conductive lines designed to connect with communication network

including arbitrary electric wire required to connect with ground by

communication network authority should be tied up together. (Refer to

figure as above.) Likewise, in case of c), all conductive lines designed to

connect with other equipment are tied up together.

D. Apply D.C. voltage same as the peak value of sine wave voltage of

frequency 50 or 60 or with the regulated A.C. test voltage for 60

seconds. Applying voltage is as follows.

- In case of a) of 1) item : 1.5 kV

- In case of b) and c) : 1.0 kV

Increase test voltage from 0 to the regulated value, and keep it at the

regulated value for 60 seconds.

E. If a capacitor is connected with both ends of an insulation part, it is

recommended to apply D.C. voltage and conduct the test.

F. In case of the above specific parts b) and c), if a surge absorber satisfies

b) and c) of TNV circuit impulse test when it is tested out of an equipment

separately, the surge absorber can be removed.

TTAS.KO-09.0018/R1(2004.12)106


A. When test voltage is applied, if current increases rapidly beyond control,

that is, if insulation can not limit the current to lower than certain value, it

is regarded as insulation breakdown. (When the test is done by increasing

cut-off current of a withstanding voltage tester, if results are no good at

any value, it is regarded as unsuitable.)

B. In case that a surge absorber works during the test (or spark-over is

generated in gas discharging tube) :

- In case of the above test method of A), a), it is regarded as unstable.

- In case of the above test method of A), b) and c), (test with a surge

absorber device) it is regarded as unsuitable.


Record the test result and the decision of suitability in corresponding blanks of

Clause 6.4.2.2. of a test certificate form.

TTAS.KO-09.0018/R1(2004.12)107

29. Flammability test for fire enclosures of movable and stationary equipment

(exceeding 18 kg)

29.1 Corresponding Clause of Technical Standard : A.1


To inspect if the enclosure for firewall of a portable equipment and a

stationary equipment whose total weight is over 18 kg can minimize the

possibility of ignition and fire or expansion of flame.


A. Ventilation hood : To prevent the possibility that toxic gas is generated

during the test. But, ventilation should not affect the test.

B. Bunsen burner : Inner diameter 9.5±0.5 , and 100 from an air inlet.

C. Gases whose calorific value is 37 MJ/ : Industrial Methane gas (maximum

purity 98.0 mole) or natural gas with a regulator and a gas flowmeter.

D. Temperature chamber of air circulation type.

E. Supporter for sample under test

F. Cotton


A. Test three of materials under test with the thickness same as one of

thinnest part of a firewall enclosure itself or a part of a fire-wall enclosure

(including holes for ventilation).

TTAS.KO-09.0018/R1(2004.12)108

B. Prior to test, select the higher value of the temperature 10K higher than the

maximum value, which is applied in temperature rise test of Clause 5.1 of

Technical Standard, and 70 , and cool it down to room temperature after

pre-treatment for 7 days (168 hours) in a temperature chamber of air

circulation type.

C. Install a material under test as in actual use. Put cotton at the point of 300

below the part which flame for test reaches.

D. Put a Bunsen burner vertically and adjust flame so that whole flame makes

around 130 long and blue flame makes 40 long.

E. Apply the test flame to the inside surface of a material under test, the part

where the possibility of ignition is because it is close to an ignition source.

F. In case of vertical part, apply flame at 20° angle from vertical line. If there

are holes for ventilation, apply flame at the edge of hole part, and in other

case, apply flame to on the plain side. In any case, the end of blue flame

should touch the material under test.

G. Apply flame for 5 seconds and pause for next 5 seconds. Repeat it 5

times to the same part.

H. Repeat this test to the other 2 materials under test. In case of the part

which has more than 2 fire-wall enclosures close to ignition source, conduct

the test by applying flame to the each corresponding part of each material

under test.

TTAS.KO-09.0018/R1(2004.12)109

Flameouter : 130diameter

Blueflame : 40

Burnerinnerdiameter

Bunsen burner

Vertical part flame application

Part except vertical part

Enclosure for firewall

(Fig. 29-1) Test flame and how to apply the flame


During the test, a flame or a lump of flame which can ignite cotton of a

material under test should not fall down. A material under test should not burn

for over 1 minute after 5th test flame is turned off and should not burn

completely.


Record the test result in the Clauses A.1 and A. of a test certificate form and

make the decision of suitability.

TTAS.KO-09.0018/R1(2004.12)110

30. Flammability test for fire enclosures of movable and stationary equipment (not

exceeding 18 kg)



To inspect if the enclosure for firewall of a portable equipment and a

stationary equipment whose total weight is lower than 18 kg can minimize the

possibility of ignition and fire or expansion of flame.





C. Gases whose calorific value is 37MJ/ : industrial Methane gas (maximum


D. A supporter for the material under test.


A. Test 3 of materials under test. In case of an enclosure for fire wall,

conduct the test with the thickness same as one of thinnest part of a

firewall enclosure itself or a part of a fire-wall enclosure (including holes

for ventilation), and in case of a material located in an enclosure for fire

wall, each material under test should consist of one of the followings.

TTAS.KO-09.0018/R1(2004.12)111

- All materials : Or

- A part of material with the thinnest thickness : Or

- Materials of the form of a small plate or the form of a pole for test with

the thickness same as the thinnest part

In case of a part used inside of an enclosure for fare wall, the material

under test should be all parts in any case.

B. Prior to test, select the higher value of the temperature 10K higher than the

maximum value, which is applied in temperature rise test of Clause 5.1 of

Technical Standard, and 70 , and cool it down to room temperature after

pre-treatment for 7 days (168 hours) in a temperature chamber of air

circulation type.

C. Attach a test tag as in actual state of use.

D. Put a Bunsen burner vertically and close the air hole, and adjust flame so

that whole flame makes around 20 long.

E. Apply flame to a part with the possibility of ignition because the part is

close to ignition source on inside surface of a material under test. In case

of estimation of material used inside of an enclosure for fire wall, test

flame can be applied to the outside of a material under test. In case of

inspection of a part used inside of an enclosure for firewall, apply test

flame to the material under test directly.

F. In case of vertical part, apply flame at 20° angle from vertical line. If there

are holes for ventilation, apply flame at the edge of hole part, and in other

case, apply flame to on the plain side. In any case, the end of flame

should touch the material under test.

TTAS.KO-09.0018/R1(2004.12)112

G. Apply flame for 30 seconds, and pause for the next 1 minute, and apply

flame again for 30 seconds.

H. Repeat this test to the other 2 materials under test. If more than one part

of the material under test are close to an ignition source, apply flame to

other part of each material under test close to an ignition source.


A. After second test flame is turned off, a material under test should not burn

for over 1 minute and should not burn completely.

B. Instead of instruments and procedure regulated in the Clauses A.2.4. and

A.2.5. of Technical Standard, those in the Clauses 4 and 8 of IEC 695-2-2

: [Fire test II : Needle-flame test] can be applied. In this case, how to

apply flame, time, and number comply with the Clause A.2.5. of Technical

Standard, and the suitability is decided according to Clause A.2.4.

Either of the above A. or B. item should be satisfied.


Record test result in Clause A.2 and A. of a test certificate and make the


TTAS.KO-09.0018/R1(2004.12)113

31. High current arcing ignition test



To check if an enclosure located within 13 from a flame source, such as a

commutator and a contact of a switch which are not sealed, or a part of it

minimizes hazard of ignition and expansion of fire or flame. (This test is

applied to an enclosure only but not to a part.)


A. Electrode for test 2 each

B. Voltage regulator : 220-240V, 50 or 60 .　

C. Variable load of inductive impedance (power factor 0.5)


A. Test 5 samples regarding each material of an enclosure. Dimension of

sample should be 130 long and 13 width and thickness same as the

thinnest part of an enclosure. The edge should not have burr, fin, etc.

B. Test by using a variable load of inductive impedance connected, in parallel,

with 2 test electrodes and power of A.C. 220-240 V or power of 60 .

TTAS.KO-09.0018/R1(2004.12)114

Stationary electrodeMovable electrode

Z=load(power factor 0.5)Sample under test

(Fig. 31-1) High current arc test circuit

The same circuit as the above figure can be used.

C. Of 2 electrodes, fix one electrode and let the other one be movable. A

fixed electrode should be copper, which has a shape of a chisel, whose

end part has angle of 30° and outer diameter of 3.5 , and a movable

electrode, as a stainless pole with outer diameter 3 , which has an angle

of 60° at the end in shape of symmetric pyramid, should be movable along

an axis. The curvature radius of ends of 2 electrodes should be shorter

than 0.1 , and 2 electrodes should be placed face to face with an angle

of 45° horizontally. Short those and adjust a variable load of impedance so

that current of 33A flows in power factor of 0.5.

D. When electrodes are contacted by fixing test sample in the air or on a

non-conductive object horizontally, let electrodes contact the surface of a

test sample. Cut off a circuit by putting a movable electrode away from

the fixed one by manual or other manner, and make a closed circuit by

putting it near to the fixed one again, and make arc 40 times per minute.

Make the retreating speed of the movable electrode be 254±25 /s.

E. Until test sample is ignited and holes are created in the test sample, or

until arc is generated 200 times, repeat the test.

TTAS.KO-09.0018/R1(2004.12)115


Until test sample is ignited, number of arc should be the average of over 15

times in case of material of fire resistance class V-0, and over 30 times in

case of other material.


Record the test result in the Clauses A.3 and A. of a test certificate and make

the decision of suitability.

TTAS.KO-09.0018/R1(2004.12)116

32. Hot wire ignition test



To check if an enclosure located within 13 from a part, which can reach the

ignition temperature in normal or abnormal operating, minimizes hazard of

ignition and expansion of fire or flame.


A. Nichrome wire : Nickel-80%, chrome-20%, length-250±5 , diameter-0.5 ,

resistance-5.28 /m at room temperature.Ω

B. Variable power : 0-50Vac, 60 , 15A or equivalents

C. VAW meter

D. Stop watch


A. Test 5 samples regarding each material of an enclosure. Dimension of a

sample should be 130 long and 13 width and uniform thickness same

as the thinnest part of an enclosure. The edge should not have burr, fin,

etc.

TTAS.KO-09.0018/R1(2004.12)117

B. Use Nichrome wire whose length is 250±5 long and diameter is 0.5

and which does not contain iron content (nickel 80%, chrome 20%) and

resistance at room temperature is 5.28 /m. Connect a nichrome wire with aΩ

variable voltage source after straightening it, and adjust power so that

power consumption makes 0.26W/ (65W at both ends of a nichrome

wire) and apply it for 8~12 seconds. After cooling it down, wind it on a

sample 5 turns at interval of 6 .

C. Fix a sample wound with a Nichrome wire horizontally, and connect both

ends of it with a variable power source, and adjust power so that power

consumption makes 0,26W/ (65W at both ends of a nichrome wire).

Nichrome wire

(Fig. 32-1) Heating element ignition test device

D. Prior to test, apply power so that current of power density of 0.26W/ ±4%

flows. Continue the test until the sample is ignited, or for 120 seconds. At

the igniting time or after 120 sec, stop the test, and record the test time.

If ignition is not generated and a sample under test is melted by a heating

element, stop the test at the time when the heating element wound on the

sample 5 turns does not contact the sample closely.

E. Repeat this test for the other samples.

TTAS.KO-09.0018/R1(2004.12)118

32.5 Decision of Suitability

The sample should be ignited for over fifteen seconds on average.


Record test result and the decision of suitability in the A.4 and A of a test

certificate form.

TTAS.KO-09.0018/R1(2004.12)119

33. Hot flaming oil test



To check if an enclosure for firewall has the structure which minimizes the

possibility of diffusion of flame, melting metal, burning and red heating

particles or burning drops.


A. Cotton cloth : around 40g/

B. Small oiling container in shape of a scoop (Outer diameter is less than 65

.)

C. Distilled fuel of Medium volatility 10ml : weight per unit volume : 0.845g/

- 0.865g/ , ignition point : 43.5 - 93.5 , average heating value : 38Mj/

.ℓ

D. Stop watch.


A. Firmly fix a finished product of an enclosure for firewall or sample under

test horizontally. Put a layer of a bleached cotton cloth on a plain plate 50

below the sample under test. The cotton cloth should have enough size

to fully cover the hole part of the sample, but if oil does not flow through

a hole of the sample, it should not be big to the degree that oil overflown

at the corner or other place can be contained.

B. It is desirable to enclose around the test area with a metal screen or

glasses with built-in net.

TTAS.KO-09.0018/R1(2004.12)120

C. Fill 10 of the distilled fuel of medium volatility whose weight per unit

volume is 0.845g/ - 0.865g/ , ignition point is 43.5 - 93.5 ,

average heating value is 38MJ/ to an oiling hole and a metal oilingℓ

container in shape of a small scoop with a long handle which is kept

horizontally during oiling.

D. Heat an oiling container filled fully with oil, and ignite it. After burning for 1

minute fill all the oil through the center of an oiling hole at the point of

100 high from an oiling hole at the speed of around 1 /s.

E. repeat this test 2 times at the interval of 5 minutes. In the second test,

change with clean cotton cloth.


Cotton cloth should not be ignited during the above test.

33.6 Preparation of a certificate

Record the test result in Clause A.5 and A of a test certificate and make a


TTAS.KO-09.0018/R1(2004.12)121

34. Flammability test for classifying Materials V-0, V-1 or V-2



To check the fire resistance class of other material except foamed materials

(including hardened foamed materials) and parts.





C. Gases whose heating value is 37MJ/ : Industrial methane gas (maximum


D. Temperature chamber of air circulation type

E. Calcium chloride dryer

F. Temperature and humidity chamber

G. Supporter for sample under test

H. Surgical sanitary cotton


A. Test 10 samples of materials or assemblies as follows.

TTAS.KO-09.0018/R1(2004.12)122

B. Materials under test should be around 130 long and around 13 wide,

and should have thickness same as the thinnest thickness. In case of

sound proof materials, except foamed plastic, used by attaching to a panel

of other materials, the one whose sound proof materials is attached to a

panel with thickness same as the thinnest thickness, can be used. In case

of testing assembly, a sample bigger than the regulated size, as an

assembly or a part of an assembly, can be used. The finished products

such as a gear, a wrap, a bearing, a tube, a wiring tool etc. can be

tested, and a sample made by cutting a finished product can be tested.

C. Prior to test, pre-treat a group of 5 samples in a temperature chamber of

air circulation type at 70±1 for 7 days (168 hours). And then, at once,

put those in a dryer with Calcium chloride for 4 hours and cool down to

room temperature. Pre-treat another group (5 samples) under condition of

relative humidity 45% ~ 55%, temperature 23±2 for 48 hours.

D. Put a sample along the length vertically and fix the upper end with a

clamp. At this time, locate a bottom side corner of a sample at the

position of 300 above a spreaded cotton of 50 × 50 with thickness

of 6 which is not dented.

E. In state that a Bunsen burner is not ignited, whose inner diameter is

9.5±0.5 and length is 100 from an air inlet, put the burner vertically

and fix under an sample so that an axis of the burner is along the sample.

At this time, put the end of a burner barrel at the position of 9.5 under

the end of a sample.

TTAS.KO-09.0018/R1(2004.12)123

F. It should be easy to move out and in the burner with its supporter. Use

gas which has heating value of around 37 MJ/ . In state that the burner is

out of the position, ignite and adjust so that height of flame is 20 and

blue flame is stable.

Bunsen burner

Surgical cotton

Blue flame

Sample under test

(Fig. 34-1) Test flame for V-0, V-1 and V-2

G. Put a burner under a sample, and after 10 seconds, turn off the flame.

After flame is turned off, burning time of a sample should be shorter than

10 seconds in case of V-0, and shorter than 30 seconds in case of V-1

and V-2.

H. Just after burning of a sample, repeat G. procedure on the very sample. In

the second test, after turning off flame, red heating time of the sample

should be blow 30 seconds in case of V-0, and shorter than 60 seconds,

in case of V-1 and V-2.

I. Regarding the remaining 4 samples of a group, repeat the test of G. and H.

TTAS.KO-09.0018/R1(2004.12)124


A. V-2 class :

Materials satisfying all the following items. (Only those which have thickness

over the tested thickness.)

- All samples should satisfy the above procedures G, H, and I.

- Average burning time of 5 samples of a group should be shorter than 25

seconds.

- Samples should not burn up to the point of a fixing clamp.

- In case of V-2 class, surgical cotton can be ignited.

B. V-1 class :

Materials satisfying all the following items. (Only those which have thickness




seconds.


- While test flame is applied or not, cotton should not be ignited by a

small particle or drops from a sample under test.

TTAS.KO-09.0018/R1(2004.12)125

C. V-0 class :

Materials satisfying all the following items. (only those which have thickness




seconds.


- While test flame is applied or not, cotton should not be ignited by a

small particle or drops from a sample under test.

D. If one of 5 samples of a group is not suitable, conduct the identical test

for other group (5 each) of samples. All samples of second group should

be suitable to the above test to be classified to V-0, V-1 or V-2.


Record the test result briefly in the Clauses A.6 and A of a test certificate and

make a decision, and record the detailed test result by using "Note#".

TTAS.KO-09.0018/R1(2004.12)126

35. Flammability test for classifying HF-1, HF-2 or HBF



To check the fire resistance class of foamed materials and parts.



during test. But, ventilation should not affect the test.

B. Bunsen burner : Inner diameter 9.5±0.5 , 100 from an air inlet, flame

expander-50

C. Gases whose heating value is 37MJ/ : Industrial Methane gas (maximum


D. Temperature chamber of air circulation type



G. Sample supporter

H. Horizontal steel wire net

I. Surgical sanitary cotton

TTAS.KO-09.0018/R1(2004.12)127


A. Prepare 10 of foamed plastic materials.

B. Materials under test should be around 150 long and around 50 wide,

and should have thickness same as the thinnest thickness. In case of

foamed materials used by attaching to a panel of other materials, the one

whose sound proof materials is attached to a panel with thickness same as

the thinnest thickness, can be used.

C. Prior to test, pre-treat a group of 5 samples in a temperature chamber of

air circulation type at 70±1 for 7 days (168 hours). And then, at once,

put those in a dryer with Calcium Chloride for 4 hours and cool down to

room temperature. Pre-treat 5 samples of another group (B) under

condition of relative humidity 45% ~ 55% and temperature 23±2 for 48

hours.

D. Put a sample on a horizontal steel wire net (6.5 quadrate net of 0.8

steel wire). Size of this wire net is 200 long and 75 wide. Bend the

wire vertically at a point of 13 apart from the wire net. Fix the wire net

above cotton at a place of around 300 high.

E. By using a Bunsen burner with a flame expander of inner diameter 9.5±0.5

, 50 wide and 100 long from an air inlet, make fish tail flame. Put a

burner below 13 under the bent part of a wire net so that flame is in

parallel with the bent part and is in center of the bent part.


gas which has heating value of around 37MJ/ . In state that the burner is

out of the position, ignite and adjust it so that height of flame becomes 38

and blue flame becomes stable.

TTAS.KO-09.0018/R1(2004.12)128

Surgical cotton

Steel wire net

Sample undertest

(Fig. 35-1) Test block diagram of MF-1, MF-2, H13F

G. Put a sample horizontally on a wire net so that an end of the sample

contacts the end of the vertically bent part of the wire net. If a sample is

the one combined with other material, put a sample so that the part of

foamed material is located to upper direction.

H. Put a burner under a sample, and after 60 seconds, turn off the flame.

Repeat this test for the remaining 9 samples.


A. HF-2:

should satisfy all of the following conditions.

Over one of samples of the group A or the group B should not burn①

for over 2 seconds after flame is turned off.

After test flame is turned off, the burning time of all samples under test②

should be shorter than 10 seconds.

After test flame is turned off, the red heating time of all samples under③

test should be shorter than 30 seconds.

TTAS.KO-09.0018/R1(2004.12)129

The length of flame burning or red heating from the point where test④

flame is applied should be shorter than 60 .

It is allowable to ignite cotton.⑤

B. HF-1:

It should satisfy the condition of ~ of decision of HF-2 class① ← ↓ ←

Cotton should not be ignited by a small particle or drops from a②

sample during ignition or after test flame is turned off.↑

C. HBF:

Although it does not satisfy the condition of ~ of the decision of← ↓ ←

HF-2 class, all samples should satisfy one of following conditions.

- Burning speed for 100 length should be less than 40 /min, or

- Burning should stop before flame reaches a point 120 apart from the

point where flame is applied.

- In case that only one sample of group A or group B is not suitable to

the above requirements, regarding 5 samples of other group, the same

test is done through pre-treatment. All samples of this group should

satisfy the above requirements.

D. If samples of group A or group B are not suitable to the requirements of

HF-2 of the above item A and HF-1 of the above item B by one of the

followings, the same test is done for 5 samples of the second group.

TTAS.KO-09.0018/R1(2004.12)130

- Although the burning time of a sample is over 10 seconds, if the burning

time of another sample in the same group is over 2 seconds and shorter

than 10 seconds, or

- If the burning time of 2 samples in the group is over 2 seconds and shorter

than 10 seconds, or

- If burning or red heating length of a sample in the group exceeds 60

from the point where test flame is applied, or

- If red heating time of a sample of a group is over 30 seconds after flame

is turned off, or

- The case that cotton is ignited by a small particle or drops from a sample

of a group.



make a decision of suitability, and record the detailed test result by using

"Note#".

TTAS.KO-09.0018/R1(2004.12)131

36. Flammability test for classifying Materials HB



To check fire resistance of materials of HF class.




B. Bunsen burner : Inner diameter 9.5±0.5 , and 100 from an air inlet



D. Temperature and humidity chamber

E. Sample supporter

F. Horizontal steel wire net

G. Measuring tape

H. Protractor


A. Prepare 3 samples of materials or assemblies.

TTAS.KO-09.0018/R1(2004.12)132

B. Materials for a sample should be 130 long and 13 wide, and its edge

should not be sharp, and should have the thickness same as or thinner

than the thinnest part. If the thickness of materials is over 3 , use a

sample of 3 thickness. Mark a line at the points of 25 and 100 from

an end of a sample to the direction of width.

C. Prior to test, pre-treat samples in condition of temperature of 23±2 and

relative humidity of 45% ~ 55% for 48 hours.

D. Put a sample so that a longer side is horizontal and a shorter side is at

the angle of 45°, and fix the opposite end of the making line of 25 with a

clamp. Fix steel wire net of plate form horizontally at the point of 10 below

the lower edge of a sample, and locate the other end of a sample, which is

not fixed, at the position just above an end of the steel wire net.

Sampleundertest

Metalnet

Metalnet

about

(Fig. 36-1) Fire resistance test device for HB class

E. To make the end of a sample contact test flame when a burner is ignited,

tilt a Bunsen burner, whose inner diameter is 9.5±0.5 and the length is

around 100 from an air inlet, around 45% for the vertical line in state that

it is not ignited, put axis of a burner so as to meet the vertical side

identical with lower edge of a sample, and fix it so that the lower end of a

burner tube is located at the point 10 below the side, which is not fixed,

of a sample.

TTAS.KO-09.0018/R1(2004.12)133


gas which has heating value of around 37MJ/ . In state that the burner is

out of the position, ignite and adjust it so that height of flame becomes 25

and blue flame becomes stable.

G. Move burner flame to an end of a sample, and turn off the burner after

burning for 30 seconds or until flame reaches the marking line of 25 .

Measure the time of flame burning or red heating from the line of 25 to

the line of 100 of lower part of a sample, and calculate the burning

speed into /minute.

Repeat this test for the remaining 2 samples.


A. As the result of test, burning or red heating speed of all samples should

not exceed the following values.

- If the thickness of a sample is 3 : 40 /minute

- If the thickness of a sample is less than 3 : 75 /minute

Or, if burning or red heating does not reach the marking line of 100mm.

B. If one of 3 samples of a group is not suitable to the requirements of item

A, conduct the same test for the 3 samples of another group. All samples

of second group should satisfy all requirements of item A.



make a decision. Record the detailed test result by using "Note#" if required.

TTAS.KO-09.0018/R1(2004.12)134

37. Flammability test for classifying Materials 5V



To check fire resistance of material of 5 V class.




B. Bunsen burner : Inner diameter 9.5±0.5 , 100 from an air inlet, flame

expander-50



D. Temperature chamber with air circulation type



G. Sample supporter

H. Horizontal steel wire net

I. Surgical sanitary cotton


A. This test is not applied to a sample with over 13 thick, but applied to the

test of Clause A.1. If the class is achieved as the test result of a sample

less than 13 , this class can be applied to a sample with the thickness up

to maximum 13 .

TTAS.KO-09.0018/R1(2004.12)135

B. 10 samples of bar form or 8 samples of plaque form are tested according

to a manufacturer's selection. If a sample of bar form is shrunk, extended

or melted, a sample of plaque form is tested.

C. Prior to test, pre-treat 5 samples of a group of bar form or 4 samples of

a group of plaque form in condition of temperature of 23±2 and relative

humidity of 45% ~ 55% for 48 hours.

D. Select the higher value of the temperature 10K higher than the maximum

value, which is applied in temperature rise test of Clause 5.1 of Technical

Standard, and 70 , and after pre-treating the remaining samples of group

1 (5 sample bars or 4 sample plaques) for 7 days (168 hours) in a

temperature chamber of air circulation type, cool down to room

temperature in a dryer with calcium chloride for 4 hours.

E. By using a Bunsen burner whose inner diameter is 9.5±0.5 and length is

100 from an air inlet, make test flame. When a burner, using gas whose

heating value is 37 MJ/ , is positioned vertically, adjust test flame so that

flame makes 130 high totally and the blue flame inside makes around 40

high.

F. In case of a sample of bar form, test 2 groups. Size of a sample is 130

long and 13 wide, thickness should be the value same as the thinnest

part used in an equipment (maximum 13 ).

G. Put a bar sample vertically and fix the rear end of it with a clamp of a ring

stand. Put the narrow edge to the direction of a burner. And put a layer of

cotton at the position of 300 below the part where test flame is applied.

TTAS.KO-09.0018/R1(2004.12)136

H. Apply flame to the lower edge of a sample at the angle of 20° for vertical

line so that blue flame contacts the sample.

Apply flame for 5 seconds and pause for 5 seconds, and repeat it 5 times.

After repeating 5 times, turn it off. And then check items as follows and

record.

- Sum of time of burning and red heating.

- Burnt length or damaged length

- Drops from a sample during the test.

- Transformation or change in physical strength when cooled down to room

temperature just after burning.

Total flame length

Supporter

Insideblue flame

Sample under test

(Fig. 37-1) Vertical burning test for the classification of 5V

I. In case of a plaque sample, 2 groups are tested. Size of a sample should

be 150 ×150 , and thickness should be the value same as the thinnest

part used in an equipment (maximum 13mm).

TTAS.KO-09.0018/R1(2004.12)137

J. Install samples of 4 groups, and test by applying test flame to each point

of each sample as follows.

A - Put a plaque sample of each group vertically, and apply flame to the

lower corner of a sample.

B - Put a plaque sample of each group vertically, and apply flame to the

lower edge of a sample.

C - Put a plaque sample of each group vertically, and apply flame to the

center of a side of a sample.

D - Put a plaque sample of each group horizontally, and apply flame to

the center of a bottom of a sample.

K. Put surgical cotton, which is not treated, at the place of 300 below from

the point where test flame is applied.

L. In case of applying flame vertically to a sample, apply test flame at the

angle of 20° for the vertical line.

M. In any case, the end of blue flame should reach a test plate. Apply for 5

seconds and pause for 5 seconds, and repeat it 5 times. In this case, test

flame should be applied to the same part 5 times.

N. After turing off 5th flame, check items as follows and record.

- Sum of time of burning and red heating.

- Burnt length or damaged length

- Any drops from a sample during test.

- Transformation or change in physical strength when cooled down to room

temperature just after burning.

TTAS.KO-09.0018/R1(2004.12)138


A. For the sample during the test,

- There should not be burning drops or particle which can ignite cotton.

- Burning time or red heating time should be shorter than 60 seconds

after turning off 5th test flame.

- A sample should not be burnt completely.

In case of a bar sample : a sample should not be shrunk, extended or

melted.

If a sample is shrunk, extended or melted, a plaque sample is tested on

the basis of procedures I to N.

In case of a plaque sample : There should not be significant damage at

the part where flame is applied as the test result of C, D of the above

test method J.

B. After the test of samples of each group, make a decision as follows.

a) If all samples satisfy the requirements of item A, it is classified as 5V

class.

b) If only one sample of a group is not suitable, repeat test for the

samples of other group in the same condition. If all samples of second

group satisfy the requirements, it is regarded as 5V class.

c) If over 2 samples of a group are not suitable, it is not regarded as 5V.

TTAS.KO-09.0018/R1(2004.12)139



make a decision. Record the detailed test result by using "note #" if required.

TTAS.KO-09.0018/R1(2004.12)140

38. Motor tests under abnormal concitions

38.1 Corresponding Clause of Technical Standard : Appendix B


To check the possibility of hazard by excessive temperature rise in abnormal

state of overload, rotor restraint and others of a motor used in an equipment.


A. Voltage regulator : 0-250Vac, 60 , 15A or equivalents　

B. D.C. power supply : 0.30Vdc, over 10A

C. Proper restraint device

D. Dynamometer or eddy-current brake or proper overload device

E. Temperature recorder

F. Coil resistance meter.


TTAS.KO-09.0018/R1(2004.12)141

A. Selection of test applied. :

DC Motorof secondary

i it

YesNo

Conduct B.4 test①excluding motors as follows :

- as a motor used for air control only,one whose air propelling part isdirectly connected to a motor shaft

- as a shaded pole motor, one whosedifference between rotor restraint currentand load free current is lower than 1Aand the ration is lower than 2:1.

Conduct B.5 test②If appropriate, conduct test of③B.8, B.9, B.10

Conduct test of B.6, B7, B, 10 :

- A motor which is running inusual state of rotor restraint inproper function as a steepingmotor is excluded.

B. Test requirements

Select the more disadvantage voltage from the rated voltage and high①

limit voltage in the range of the rated voltage.

Test is done under the simulated condition inside of an equipment or on②

a working table. A separated sample under test can not be used in the

test by the simulated condition. The simulated condition includes the

followings.

- A protecting device protecting a motor inside of a finished equipment,

and

- Arbitrary device as one which plays the role of the heat sink plate of a

motor housing.

TTAS.KO-09.0018/R1(2004.12)142

Measure coil temperature by using a thermocouple or a resistance tester.③

In case of a thermocouple, attach it on the coil surface of a motor.

Measure the temperature when test for regulated time is completed, and

in other case, measure the temperature when temperature is stable, or

when fuse, overheat preventing device, or motor protecting device works.

In case of an impedance protecting motor which is sealed totally,④

measure the temperature by attaching a thermocouple to the housing of

a motor.

In case of testing a motor without a proper thermal protecting device in⑤

the simulated condition, correct the measured coil temperature in

consideration of the ambient temperature (measured during the

temperature rise test of Clause 5.1) at the point that a motor is usually

installed in an equipment.

In measurement of temperature, arithmetic average temperature should⑥

be calculated as follows.

While power of a motor is turned on and off repeatedly, draw the graph

of temperature and time for the corresponding test time, and the

arithmetic average temperature ( ) is :

; -average of maximum values, - average of

minimum values

Maximum value

Minimum value

Time

(Fig. 38-1)

TTAS.KO-09.0018/R1(2004.12)143

C. B.4 Overload operating test

Run a motor under normal load.①

While keeping the initial voltage applied to a motor, increase load②

gradually so that current increases step by step.

After reaching normal state, increase load again. In this way, increase③

load step by step until an overload protecting device works. However, at

this time, a rotor should not be in restraint state.

Measure and record the temperature of a motor coil for the stable cycle④

as shown in the above figure.

D. B.5 Rotor restraint overload test

Conduct a rotor restraint test at ambient temperature as room①

temperature.

Test time is as follows :②

- In case of a motor protected by proper impedance or external impedance,

run under the state of motor restraint for 18 days. However, when the

temperature of a motor coil, which is open type or sealed totally, reaches

a certain value, if it is lower than the value regulated in Clause 5.1 of

Technical Standard regarding the insulation system in use, the test can be

stopped at the time.

- If a motor has a protecting device of automatic reset type, run a motor

under the state of rotor restraint for 18 days.

- If a motor has a protecting device of manual reset type, run a motor

under the state of rotor restraint 60 times repeatedly. In this case, if a

protecting device works, reset it immediately. (However, it should be over

30 seconds.)

TTAS.KO-09.0018/R1(2004.12)144

- If a motor has a protecting device without reset function, run until t device

works.

Record temperature at regular interval for the first 3 days in case of a③

motor protected by proper or external impedance or a motor with a

protecting device of automatic reset type, during first 10th running in

case of a motor with a protecting device of manual reset type, or until

the protecting device works in case of a motor with a protecting device

without reset function.

Reference - Testing a protecting device of automatic reset type

continuously for over 72 hours and testing a protecting device

of manual reset type for over 10 times are to check if the

protecting device have the capability to interrupt the rotor

restraint

E. B.6 Overload operating test of a D.C. motor used in a secondary circuit

If it is expected that there is possibility of overload by inspection or as①

the result of checking the structure, conduct the overload operating test.

In case of the structure where the driving current is kept constant by an

electronic driving circuit, the test is not required.

Test by running a motor at the running voltage under normal load, and②

while keeping initial voltage applying to a motor, increase load gradually

so that current increases step by step. If it reaches normal state,

increase load again. In this way, increase load step by step until an

overload protecting device works or a coil is broken.

When temperature is constant at each step, measure the temperature of a③

motor coil.

TTAS.KO-09.0018/R1(2004.12)145

If it is not easy to measure exact temperature because a motor is small④

and its structure is not general, instead of measuring temperature,

checking the possibility of ignition by covering a motor with a layer of

cotton cloth of around 40g/ during the overload running test can be

substituted.

F. B7. A rotor restraint overload test of a D.C. motor used in a secondary

circuit.

A motor should satisfy the test of the following item . However, if it is① ③

not easy to measure exact temperature because a motor is small and its

structure is not general, the test method of following item can be④

conducted instead of item . Either one of the 2 tests should be done.③

If the running voltage of a motor exceeds peak voltage of 42,4V or D.C.②

60V, conduct the corresponding test of item or item , and then cool→ ↓

down the motor to room temperature. Conduct withstanding voltage test,

and the motor should be suitable to this test. In this case, test voltage

should be 0.6 times of the regulated value.

Apply running voltage to a motor and in state that a rotor is restrained,③

run the motor for the longer time of 7 hours time and the time that the

motor reaches normal state.

Install a motor on the lumber covered with a layer of the wrapping foil,④

and then cover the motor with a layer of a cotton cloth of around 40g/ .

Note - The wrapping foil is defined in ISO standard 4046 as follows.

"Wrapping paper should be a soft and light one used for

packing or wrapping of a gift to protect an article mostly

requiring handling with care and the weight should be 12 g/ to

30 g/ ."

TTAS.KO-09.0018/R1(2004.12)146

And then, apply running voltage to the motor, and in state that the rotor is

restrained, run the motor for the longer time of 7 hours time and the time

that the motor reaches normal state.

G. B.8. Test of a motor with a capacitor

In case of a motor with a phase invertible capacitor, short or open the①

capacitor(in the more disadvantageous state of the two) and test in state

that a rotor is restrained.

If a capacitor with the structure where the capacitor does not become the②

state of short circuit in trouble, the short circuit test of the capacitor is

not required.

H. B.9 A 3-phase motor

In case of a 3-phase motor, apply a normal load in state that a phase①

is not connected. However, if a motor is designed so that power can

not be applied to it by a circuit control device in state that even 1

phase is opened, this test is not required.

To check the influence by other load or a circuit inside of an equipment,②

in some case, the test for a motor can be done inside of an equipment

by opening each phase of 3-phase power in turn.

I. B.10 Test of a series motor

Applying as minimum load as possible, run a series motor at 1.3 times①

of the rated voltage for 1 minute.

TTAS.KO-09.0018/R1(2004.12)147


A. B4. Overload running test : The measured temperature should not exceed

the value indicated in Table B.2 of Technical Standard.

B. B.5 Rotor restraint overload test :

The measured temperature should not exceed the value regulated in①

Table B.2 of Technical Standard.

During the test, the bad insulation in a motor frame or the permanent②

damage including excessive deterioration of the insulation for a motor

should not happen, and a protecting device should work surely.

Included permanent damages to motors below.

- Generation of severe or long lasting smoke, or ignition.

- Electrical or mechanical trouble of auxiliary parts such as a capacitor

or a driving rely.

- Exfoliation of insulation, break or carbonation.

Discoloring of the insulator is allowable, but, when coils are rubbed by③

a finger, carbonation or breaks to the extent that insulator can be

exfoliated or broken is not allowable.

After the time regulated regarding measurement of temperature elapsed,④

and after cooling down, a motor should be suitable to the withstanding

voltage test. Test voltage should be 0.6 times of the regulated value.

C. B.6 Overload running test of a D.C. motor used in a secondary circuit :

- The measured temperature should not exceed the value of Table B.2 of

Technical Standard, or

TTAS.KO-09.0018/R1(2004.12)148

- If cotton cloth is used for the substitute test, it should not be ignited.

D. B7. Rotor restraint overload test of a D.C. motor used in a secondary

circuit :

- It should be suitable to the withstanding voltage test. Test voltage should

be 0.6 times of the regulated value.

- The measured temperature should not exceed the value of Table B.1 of

Technical Standard, or

- If wrapping foil or cotton cloth is used for the substitute test, it should

not be ignited.

E. B.8 Test of a motor with a capacitor :

The measured temperature should not exceed the value of Table B.1 of

Technical Standard,

F. B.9 3-Phase motor test :

The measured temperature should not exceed the value of Table B.1 of

Technical Standard.

G. B.10 Series motor test :

After the test, coil and connecting part should not be released, and hazard

regulated in this regulation should not happen.

TTAS.KO-09.0018/R1(2004.12)149

<Table 38-1> Allowable temperature of a motor coil (excluding overload running

test)

Maximum allowable temperature ( )


Protection by proper or external

impedance150 165 175 190 210

Protection by a protecting device

working within one hour200 215 225 240 260

Protection by other protecting device

- Maximum value after one hour

- Arithmetic average value within 2

hours or 72 hours

175

150

190

165

200

175

215

190

235

210

<Table 38-2> Allowable temperature in overload running test

Limited temperature value ( )


140 155 165 180 200


Record brief test result and the decision of suitability in Appendix B. of a test

certificate form, and record the detailed value by using "Note#" if necessary.

TTAS.KO-09.0018/R1(2004.12)150

39. Ionizing radiation test

39.1 Corresponding Clause of Technical Standard : Appendix H


Regarding an equipment which can radiate X-ray, to check if the quantity of

X-ray is hazardous for a human body.


A. Voltage regulator : 0-250 Vac, 60 , 15A or equivalent instrument　

B. Radioactive ray quantity measuring system : Effective area 10


A. Run an equipment in most disadvantageous voltage of the rated voltage of

an equipment or, -10% or +6% of the rated voltage.

B. In case of a controller that a operator operates or a controller operated in

service, control the controller so that maximum quantity of X-ray is radiated

in the range that an equipment works in normal state.

C. An internal control device designed not to be adjusted for the life span of

the equipment is not regarded as a controller.

D. Measure the radiated quantity at the point of 5cm apart from an operator

accessible area.


The measured irradiation rate should less than 36 / . (At this time, consider

ambient radioactive ray quantity.)

TTAS.KO-09.0018/R1(2004.12)151


Record the test result in Appendix H. of a test certificate form, and make the


TTAS.KO-09.0018/R1(2004.12)152

40. Test for thermal controls

40.1 Corresponding Clause of Technical Standard : Appendix K


To check if an automatic temperature controller or a temperature limiter has

sufficient switching capacity.


A. Heater

B. Temperature recorder


A. Regarding 3 samples under test, conduct the appropriate test by the

Clauses K.2 and K.3 of Technical Standard or test by the Clause K.4, and

decide the suitability.

B. In case of a part with T mark, test the switching part of 1 sample at room

temperature, and test the switching part of the remaining 2 samples at the

indicated temperature.

C. In case of a part without the rating mark, test can be done in state that it

is installed in an equipment or test can be done regarding the part only

separately. Test can be done by the more convenient method of the two.

But, if the test for the part only is done separately, test condition should

be same with the condition inside of an equipment.

TTAS.KO-09.0018/R1(2004.12)153

D. If a part can not be tested separately, test 3 sets of equipments with the

part.

E. During the test, the switching speed can be made faster than the normal

switching speed of the case that an equipment works, except the case that

the possibility of break increases by increasing speed.

F. K.2 Automatic temperature controller test :

Apply the voltage of 1.1 times of the rated voltage or the voltage of 1.1①

times of high limit value in range of the rated voltage, and apply the

load of most disadvantageous condition which is generated in usual

operating, and operate the equipment.

By setting temperature up and down, operate an automatic temperature②

controller 200 times (appling voltage 200 times to the heater and

interrupting 200 times).

G. K.3 Automatic temperature controller test :

Apply the rated voltage or the high limit value of the rated voltage,①

and operate an equipment by applying normal load.

By setting temperature up and down, operate an automatic②

temperature controller 10,000 times (appling voltage 10,000 times to

the heater and interrupting 10,000 times).

H. K.4 Temperature controller test :

Apply the rated voltage or the high limit value of the rated voltage,①

and operate an equipment by applying normal load.

By setting temperature up and down, operate an automatic②

temperature controller 1,000 times (appling voltage 1,000 times to the

heater and interrupting 1,000 times).

TTAS.KO-09.0018/R1(2004.12)154

I. K.5 Overheat protecting device :

Operate an equipment under the condition regulated in Clause 5.1 of①

Technical Standard, decide the suitability.

Operate an overheat protecting device of automatic reset type 200 times,②

and operate an overheat protecting device of manual reset type 10 times

by resetting manually.

To prevent damage of the equipment, cool it down by force or pause.


A. Sequential arc should not happen during the test.

B. After the test, any serious damage that causes trouble in normal operation

should not happen to the equipment, and an electrical connecting part

should not be released.

C. Parts should endure the withstanding voltage test regulated in Technical

Standard, and in this case, the test voltage applied to the insulation part

between contacts should be double of the voltage applied when the

equipment works at the rated voltage or the high limit voltage in range of

the rated voltage.

D. An overheat-preventing device should work surely.

E. An automatic temperature controller, a temperature limiter, and an overheat

preventing device should have the structure where controlling position is

not changed remarkably by heat generated during the usual operation or

vibration.

TTAS.KO-09.0018/R1(2004.12)155


Record the test result in the Clause 5.4.8 of a test certificate and the Clause

5.4 of an auxiliary table, and make a decision of suitability.

TTAS.KO-09.0018/R1(2004.12)156

Annex I

Opening a court particulars from 2nd petal.

Item First edition Second edition Remarks

12.3 C. PVB pipe (outer diameter : 51 ) PVB pipe Reflection of

present operating

situation of

test institutes and

Radio Research

Laboratory

Notification

(October

12, 2002) "Type

approval treatment

method)"

related to Attached

table 4.

16.3 E. Thermocouple of

Type K, No30 AWG

Thermocouple

17.3 B. Leakage current meter

(YEW type No.3226)

Leakage current

meter

by Appendix D of

Technical Standard

18.3 A. 0-50Vac and dc

60 100 maximum or

0-5000Vac and dc

60 or

18.3 B. 0-50KVac ~ or

equivalent

<Deleted>

20.3 F. Hot line Coil ohm meter Coil resistance tester

26.3 B.Leakage current meter

(YEW type No.3226)

Leakage current

meter

by Appendix D of

Technical Standard

28.3 A.0-5 ac/dc cut-off

current: 100

0-5 ac/dc

38.3 F. Hot Coil Ohm Meter Coil resistance tester

39.3 B.

Victoreen, 440RF/D or

equivalent instrument

(Radioactive ray

quantity measuring

system : Effective area

10 )

Radioactive ray

quantity

measuring system :

effective area 10

Contributors to Standard Write-up

Standard No. : TTAS.KO-09.0018/R1

The following individuals have contributed to enacting, amending, publishing of

the present standard.Task Name Committee & Position Contact Company

Assignment ProposalRadio Research

Laboratory/ETRI

First Standard Draft

Submission

Radio Research

Laboratory/ETRI

First Standard Draft

Review & Write-up

J.J. LeeChairman of DSL Project

Group042-870-8715 KT

Y.H. KimVice Chairman of DSL

Project Group042-860-6716 ETRI

J.H. ChoeVice Chairman of DSL

Project Group02-6266-4995

Hanaro

Telecom

M.J. Kang Staff of DSL Project Group 042-870-8736 KT

and 11 Committeemen of

DSL Project Group

Standard Draft

Editing &

Supervision

J.J. LeeChairman of DSL Project

Group042-870-8715 KT

Y.H. KimVice Chairman of DSL

Project Group042-860-6716 ETRI

J.H. ChoeVice Chairman of DSL

Project Group02-6266-4995

Hanaro

Telecom

M.J. Kang Staff of DSL Project Group 042-870-8736 KT


DSL Project Group

Standard

Deliberation

G.S. Min

Chairman of

Telecommunication

Technical Committee

042)870-8340 KT

G.R. Park

Vice Chairman of

Telecommunication

Technical Committee

042)860-5290 ETRI

S.G. Kang

Vice Chairman of

Telecommunication

Technical Committee

042)860-6117 ETRI

I.Y. Jeong

Vice Chairman of

Telecommunication

Technical Committee

031)330-4229

Hankuk Univ.

of Foreign

Studies


Telecommunication

Technical Committee

BureauS. Kim Chief of Team 031)724-0080 TTA

G.Y. O Section Manager 031)724-0081 TTA