iec - panel regulation

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IEC 61439The new tandard or low-voltagewitchgear and controlgear AssEMBLIEs

11 | 2010


2/202 IEC 61439 The new standard


3/20IEC 61439 The new standard 3

Content

Page

Introduction ....................................................................... 4

The current IEC 60439 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... . 5

The new IEC 61439 ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... ... .. 6

Main change .................................................................... 7

Reponibilitie .................................................................12

FAQ .................................................................................14

summary and concluion ...................................................16



A low-voltage switchgear and controlgear assembly

(ASSEMBLY) is a combination of low-voltage switching

devices together with associated equipment (for control-

ling, measuring, signalling, etc.) complete with all the

internal mechanical and electrical interconnections and

structural parts. As with every component of an electrical

installation, the ASSEMBLY also has to comply with its

appropriate standard.

In January 2009 the IEC 61439, the new tandard or low-

voltage witchgear and controlgear AssEMBLIEs, wa

publihed. Thi wa the aim o an international project groupwhich had been working on a tak named radical retructuring

and reviion o IEC 60439 erie ince 1998. Thi initiative

wa introduced by everal countrie ollowing diatiaction

with the IEC 60439 erie. The purpoe wa to harmonie

and deine all general requirement or low-voltage electrical

AssEMBLIEs.

Reaching an agreement ha proven extremely challenging,

but the irt part o the new tandard have been publihed.

For each type o elect rical AssEMBLY only two part o the

tandard are neceary to determine all requirement:

the baic tandard IEC 61439-1 General rule

the peciic AssEMBLY tandard

The aim o thi guide i to allow panel builder, electrical

intaller, planner or purchaer to amiliarie themelve

with the new tandard and to point out the main change

that have been introduced a well a element that remain

unchanged.

Introduction



The current IEC 60439

The current IEC 60439 standard applies to enclosures

for which the rated voltage is under or equal to 1000 V AC

(at frequencies not exceeding 1000 Hz) or 1500 V DC.

The standard makes a distinction between type-tested

assemblies (TTA) and partially type-tested assemblies

(PTTA).The following parts are mentioned and have equal

weighting. There is not a formal hierarchy. Each part is a

complete entity and can be used on an individual basis:

IEC 60439-1type-teted and partially type-teted aemblie

IEC 60439-2particular requirement or bubar trunking ytem

(buway)

IEC 60439-3particular requirement or low-voltage witchgear and

controlgear aemblie which are to be intalled in location

where unkilled peron have acce or their ue.

IEC 60439-4particular requirement or aemblie or

contruction ite (ACs)

IEC 60439-5particular requirement or aemblie intended

to be intalled outdoor in public place Cable ditribution

cabinet (CDC) or power ditribution in network

The tandard remain val id unti l 2014



IEC 61439-1

Relationship between the two standards

is as shown in the table below:

IEC 61439-2 replaceIEC 60439-1

(till valid until 2014)

IEC 61439-6 will replaceIEC 60439-2

(till valid)


(till valid)


(till valid)


(till valid)

The new IEC 61439 standard applies to enclosures

for which the rated voltage is under 1000 V AC

(at frequencies not exceeding 1000 Hz) or 1500 V DC.

The standard defines the design verified ASSEMBLIES

and eliminates completely the categories TTA and PTTA.

In order to conform to the standard, type tests have been

replaced by a design verification which can be carried

out by the three following equivalent and alternative

methods: testing, calculation/measurement or

application of design rules.

The ollowing part are mentioned and do not have equalweighting. There i a ormal hierarchy. Each part can not be

ued individually:

IEC 61439-1 General rule

IEC 61439-2 Power witchgear and

controlgear AssEMBLIEs

IEC 61439-3 Ditribution board

IEC 61439-4 AssEMBLIEs or contruction ite

IEC 61439-5 AssEMBLIEs or power ditribution

IEC 61439-6 Bubar trunking ytem

Part 1 i the general rule part and cannot be ued alone to

peciy an AssEMBLY.

Part 2 deine the peciic requirement o power witchgear

and controlgear AssEMBLIEs (PsC AssEMBLIEs) and mut

be ued with Part 1. Thi i the only part that ha a double

role, it cover PsC AssEMBLIEs and any AssEMBLY which

i not covered by any other peciic part.

Parts 3-X are till under preparation but are already men-

tioned in Part 1. Thee could be more than our, a additional

part may be developed a the need arie.

Summarising: With the currently ued IEC 60439, the rule

i one part or each type o AssEMBLY. With the new

IEC 61439 the rule i two part or each type o AssEM-

BLY. The compliance o an AssEMBLY i declared reer-

ring to the peciic AssEMBLY tandard (e.g. IEC 61439-2),

and the compliance with the general rule (IEC 61439-1) i

alway implicit. The entence TTA witchgear according to

IEC 60439-1 i now replaced by Power witchgear and

controlgear AssEMBLIEs according to IEC 61439-2, deign

veriied AssEMBLY.

The val idit y o the two tandard will overlap unti l 2014 andprior to thi date, AssEMBLIEs can be manuactured accord-

ing to IEC 61439 or IEC 60439.

The new IEC 61439



The new IEC 61439 includes the following significant

technical changes with respect to the last edition of

IEC 60439.

Responsibility split:

New term have been introduced and there i a plit in

product reponibility between the Original manuacturer

(e.g. ABB, reponible or carrying out the original deign

and the aociated veriication o an AssEMBLY)

and the AssEMBLY manuacturer (e.g panel builder

uing an AssEMBLY ytem rom an Original Manuacturer)

auming reponibility or the completed AssEMBLY.

The Aembly Manuacturer may be a dierent organiation

to the Original Manuacturer. Where the AssEMBLY Manu-

acturer introduce change to the AssEMBLY coniguration

teted by the Original Manuacturer, he i deemed to be the

Original Manuacturer in repect o thee change and ha to

carry out the deign veriication.

Design verification replaces TTA and PTTA categories:

Deign veriication replace type tet o the dicrimination

between type-teted aemblie (TTA) and partially type-

teted aemblie (PTTA) i eliminated.

Three different but equivalent types of verification of

requirements are introduced:

Veriicat ion by teting (tet made on a ample o an AssEM-

BLY or on part o AssEMBLIEs to veriy that the deign

meet the appropriate requirement. Thi method i equiva-

lent to the currently implemented type tet).

Veriicat ion by calculation/meaurement (ca lculation applied

to a ample o an AssEMBLY or to part o AssEMBLIEs to

how that the deign meet the appropriate requirement).

Veriicat ion by application o deign rule (peci ied rule to

veriy the deign o an AssEMBLY).

The elect ion o the appropriate ver iication method ha to be

made according to annex D, which explain the available veri-

ication option or each characteritic which i to be veriied,

a hown in the table below:

Main change More than a ingle digit change

Characteristic to be verified

Verification options available

Verification

by testing

Verification

by calculation

Verification

by design rules

10.2 strength o material and part Ye No No

10.3 Degree o protection o encloure Ye No Ye

10.4 Clearance and creepage ditance Ye Ye Ye

10.5.2 Eective continuity between part and PE Ye No No

10.5.3 Eectivene o the AssEMBLY or external ault Ye Ye Ye

10.6 Incorporating o apparatu No No Ye

10.7 Internal electrical circuit and connection No No Ye

10.8 Terminal or external conductor No No Ye

10.9.2 Power requency withtand voltage Ye No No

10.9.3 Impule withtand voltage Ye No Ye10.10 Temperature r ie limit Ye Ye Ye

10.11 short-circuit withtand trength Ye Ye Ye

10.12 EMC Ye No Ye

10.13 Mechanical operation Ye No No



systemm

anu

facturer

manufactureroftheASSEMBLY

ASSEMBLY

low-voltage witchgear and controlgear AssEMBLIEs

type tet or veriication o conormity

TTA

type-teted AssEMBLIEstype-teted uni t not type-teted uni t

PTTA

partial type-teted

AssEMBLIEs

routine tet

completed AssEMBLY

IEC 60439

Tests that have been made in accordance with IEC 60439

and that fulfil the requirements of the new IEC 61439 need

NOT be repeated.

The econd tage ver iication i the routine ver iication. Thi

i perormed to veriy that the material and workmanhip are

in accordance with the requirement o the tandard. Rou-

tine veriication replace the current routine tet. It i more

detailed but eentially the new requirement are the ame

a in the IEC 60439. Thi veriication ha to be carried out or

each completed AssEMBLY and it i the reponibility o the

AssEMBLY Manuacturer.


Comparison between the current and the new verification flow:



originalmanu

facturer

ASSEMBLYmanufacturer

originalmanufacturer

ASSEMBLY

low-voltage witchgear and controlgear AssEMBLIEs

teting calculation

AssEMBLY ytem

application o deign rule

routine veriication

The ASSEMBLY manufacturer can decide:

to manuacture the AssEMBLY according to the guideline o the original manuacturer

to deviate rom the guideline o the original manuacturer. Where the AssEMBLY

manuacturer incorporate hi own arrangement not included in the original manuacturer

veriication, the AssEMBLY manuacturer i deemed to be the original manuacturer

in repect o thee arrangement.

completed AssEMBLY

IEC 61439

design verification carried out by the original manuacturer



Tests described in IEC 61439-1 in comparison with the type tests described in IEC 60439

Additional verification:

New requirement rom the tandard IEC 62208

(Empty encloure or AssEMBLIEs) have been added:

veriication o reitance to UV radiation or

outdoor platic encloure

veriication o corroion reitance

mandatory declaration and conirmation o

an impule rating

liting, mechanical impact and marking

Other changes

Temperature rise

Temperature rie requirement have been explained more

clearly and have been adapted to the tate o the art.

One o the ollowing method i allowed or veriication:

teting with current

derivation (rom a teted deign)

o rating or imilar variant

calculation(see also FAQ chapter)


No. Characteristics to be verified Clause/SubclauseComparable type test

from 60439-1

1 Strength of material and parts 10.2 Not required a

Type tet but a

Deign and

contruction rule

on paragraph 7 or on

ubidiary tandard

Reitance to corroion 10.2.2

Propertie o inulating material 10.2.3

Thermal tabil ity 10.2.3.1

Reitance o inulating material to normal heat 10.2.3.2

Reitance to abnormal heat and ire due to internal electric eect 10.2.3.3

Reitance to ultra-violet (UV) radiation 10.2.4

Liting 10.2.5

Mechanical impact 10.2.6

Marking 10.2.7

2 Degree of protection of enclosures 10.3 8.2.7

3 Clearances and creepage distances 10.4 8.2.5

4 Protection against electric shock and integrity of protective circuits 10.5

8.2.4Eective continuity between the expoed conductive

part o the AssEMBLY and the protective circuit10.5.2

Eectivene o the AssEMBLY or external ault 10.5.3

5 Incorporation of switching devices and components 10.6 Not required a

Type tet but a

Deign and

contruction rule

on paragraph 7 or on

ubidiary tandard

6 Internal electrical circuits and connections 10.7

7 Terminals for external conductors 10.8

8 Dielectric properties 10.9

8.2.2Power -requency withtand voltage 10.9.2

Impule withtand voltage 10.9.3

9 Temperature rise limits 10.10 8.2.1

10 Short-circuit withstand strength 10.11 8.2.3

11 Electromagnetic compatibility (EMC) 10.12 + Annex J 8.2.8 + Annex H

12 Mechanical operation 10.13 8.2.6



RDF

The rated diverity actor i covered in more detail. In

practice it i aumed that multiple unctional unit are not

ully loaded imultaneouly. (see also FAQ chapter)

Labels

Label have to be ubjected to teting to veriy their legibility.

The ol lowing inormation i required on the label:

AssEMBLY Manuacturer name

Identiication number

Date o manuacture (NEW!)

IEC 61439-X (the peciic part X ha to be peciied)(NEW!)

Grey areas

A number o grey area have been clar iied:

neutral conductor will have a current rating equal to 50%

o the correponding phae i not otherwie peciied

agreement between Cutomer and Manuacturer have

been more detailed, extended and lited in annex C

it i mandatory to peciy the rated current o the

AssEMBLY

a technical report IEC 61439-0 Guide or peciying

AssEMBLIEs i under development or a better

undertanding o the new tandard

quetion regarding the internal orm o eparationhave been clariied

(e.g. a moulded cae circuit breaker caing provide

eparation rom other unctional unit)

Summary table with the main changes

IEC 60439 IEC 61439

IEC 60439-1

Type-teted and partial ly type-teted aemblie

IEC 61439-2

Deign veriied AssEMBLIEs

Mix of different rules and demand in each part Clear tructure:

IEC 61439-1 General rule

IEC 61439-2 -6 subidiary part (product tandard)

Each part i a complete entity and can be ued on an individual bai Each subsidiary part i baed on the general rule (Part 1)

and include only the peciic additional rule or the peciic product

Testing each type o AssEMBLY:

Partially type-teted or type-teted

Three alternative methods for verification:

Tet, calculat ion/meaurement, de ign rule

Annex E:

Agreement between Cutomer and Manuacturer

Annex C:

Agreement between Cutomer and Manuacturer are

more detailed and extended

Shared responsibility:

Original Manuacturer v. AssEMBLY Manuacturer

Technical changes and clarifications:

Diverity actor, veriication o temperature rie,

mechanical characteritic, neutral conductor 50%,

additional veriication (rom IEC 62208)



Some hypothetical examples:

An Original Manufacturer (e.g. ABB) assembles a

complete ASSEMBLY and sells it to a panel builder

the panel builder i only the AssEMBLY Manuacturer,

i he intall the AssEMBLY a it i.

the panel builder i the AssEMBLY Manuacturer and

become the Original Manuacturer i he make ome

modiication to the AssEMBLY.

A panel builder assembles a complete ASSEMBLY(according to the rules of the Original manufacturer)

the panelbuilder i the AssEMBLY Manuacturer and

i reponible or the AssEMBLY, providing the electrical

intaller intall the AssEMBLY without making any

alteration.

A panel builder assembles a complete ASSEMBLY

(according to the rules of the Original manufacturer) that

has been partially assembled by an external supplier

the panel builder i the AssEMBLY Manuacturer and

i reponible or the AssEMBLY.

With regard to responsibilities, the general and obvious

rule is: the manufacturer of the ASSEMBLY is responsible

for the ASSEMBLY!

For a better explanation o thi concept we can ay:

the Original Manuacturer uually make deign veriication

and aume reponibility or the proper unctionality o

prototype AssEMBLIEs. He provide a portolio o veriied

AssEMBLIEs and each actor in the electr ical market, who

become the AssEMBLY Manuacturer, can manuacture

a deign veriied AssEMBLY by ollowing the intruction

upplied in the Original Manuacturer intruction manual orcatalogue; the AssEMBLY Manuacturer aume reponibil-

ity or the AssEMBLY, he label the AssEMBLY and it i hi

reponibility to declare that the AssEMBLY complie with the

relevant tandard. In practice he ha two option:

he decide to manuacture the AssEMBLY according to

the rule o the Original Manuacturer. In thi cae, the

AssEMBLY Manuacturer ha to perorm only the econd

tage veriication, namely routine veriication.

he decide NOT to manuacture the AssEMBLY according

to the rule o the Original Manuacturer. In thi cae, theAssEMBLY Manuacturer incorporate hi own arrange-

ment, o that he i deemed to be the Original Manuacturer.

Regarding thee arrangement and he mut then carry

out both the irt and the econd tage veriication: deign

veriication and routine veriication.

Reponibilitie



FAQ

Is it possible to substitute a device within an

ASSEMBLY? What about temperature rise and short

circuit strength?

The new IEC 61439 clearly de ine a device ubti tut ion in

repect o temperature rie and hort circuit trength.

Temperature rie: i t i poible to ubtitute a device without

repeating the deign veriication, provided that the new device

rom the ame or another erie ha identica l or better value,

regarding power lo and terminal temperature rie, in com-

parion with thoe o the original device, a teted in accord-

ance with the product tandard.

short circuit: it i poible to ubtitute a device withoutrepeating the deign veriication, provided that the new device

i identical. I dierent, it ha to be rom the ame manuactur-

er who ha to certiy that it i equivalent or better with regard

to all relevant hort circuit characteritic.

Is the verification of the short circuit withstand strength

required for all circuits of an ASSEMBLY?

No, it i not required or:

An AssEMBLY having a rated hort-t ime withtand current

or rated conditional hort circuit current not exceeding

10 kA r.m..

An AssEMBLY protected by current-limiting device havinga cut-o current not exceeding 17 kA at the maximum

permitted propective hort-circuit current at the terminal

o the incoming circuit o the AssEMBLY.

Auxillary c ircuit o an AssEMBLY intended to be connect-

ed to tranormer whoe rated power doe not exceed

10 kVA or a rated econdary voltage o not le than 110 V,

or 1.6 kVA or a rated econdary voltage le than 110 V,

and whoe hort circuit impedance i not le than 4%.

All other circuit have to be ver iied.

Until what point is it possible to manufacture and to

install ASSEMBLIES in accordance with IEC 60439?

The val idit y o the two tandard will overlap until 2014 and

prior to thi date, AssEMBLIEs can be manuactured accord-

ing to IEC 61439 or IEC 60439.

If tests on the ASSEMBLY have been conducted in

accordance with IEC 60439, is it necessary to repeat

them in accordance with the new IEC 61439?

No, i the conducted tet reult ulil the requirement o

the new IEC 61439 it i not neceary to repeat them.

It i neceary to tet only the additional veriication thatha been introduced by the new tandard.

Is it possible to manufacture an ASSEMBLY in accordance

with the new IEC 61439, with enclosures from ABB,

busbars from another manufacturer, circuit breakers from

another manufacturer, etc.?

Ye, it i poible but it i not eay and it i expenive. The

panel builder that decide to mix dierent element rom di-

erent manuacturer i not only the AssEMBLY Manuacturer,

but become the Original Manuacturer and ha to perorm

both the irt and the econd tage veriication: deign verii-

cation and routine veriication.

The routine ver iication i imilar to the preent routine tet

and i relatively traightorward. The deign veriication how-

ever include ome characteritic which are eaily veriied,

and other that can only be veriied through laboratory

teting.

What is the Rated Diversity Factor (RDF)?

The RDF i the per unit value o the rated current, to which

outgoing circuit o an AssEMBLY can be continuouly and

imultaneouly loaded (the mutual thermal inluence have to

be taken into account). It can be declared or group ocircuit or or the whole AssEMBLY. The RDF ha to be a-

igned by the AssEMBLY Manuacturer (i not peciied it i

aumed to be equal to 1). In practice it i recognied that not

all circuit in an AssEMBLY operate at rated current

continuouly and thi allow eicient ue o material and

reource.



Does the verification of temperature

rise remain unchanged?

Temperature rie requirement have been expla ined in urther

detail. Three dierent method are now allowed or veriication

(the Original Manuacturer i reponible or chooing the

uitable veriication method):

1) Testing with current:

Three d ierent tet method are permitted and the Orig inal

Manuacturer ha to determine the bet method. When

a number o variant o an AssEMBLY have to be veriied,

the mot onerou coniguration ha to be teted and therating o the le onerou (and imilar) variant can be

derived without teting.

2) Derivation:

(rom a teted deign) o rating or imilar variant

The tandard deine a erie o ub-claue that help

deine, how non-teted variant can be veriied by

derivation rom imilar arrangement veriied by tet.

3) Calculation:

two calculation method are allowed

single compartment AssEMBLY with rated current not

exceeding 630 A (done by calculating the total power lo

o the AssEMBLY i certain condition are ulilled).

Multiple compartment AssEMBLY with rated current notexceeding 1600 A (done by calculation in accordance with

the method o IEC 60890 i certain condition are ulilled).

Flow chart to establish how to verify the temperature rise

InA

630 A singlecompartment?

YeYe

Ye

Ye No

YeNo

NoNo

No

InA

1600 A

Are the IEC 61439

and IEC 60890

condition ulilled?

Are the IEC 61439

condition ulilled?

Calculation in accordance

with IEC 60890

Teting wi th cu rrent OR

derivation (i a teted prototype i available)

Calculation o the

total power lo



summary and concluion

The new standard IEC 61439 introduces important

modifications in comparison with the current standard

IEC 60439 on low-voltage switchgear and controlgear

ASSEMBLIES.

The tructure o the new tandard i clearer with a general

part and product peciic part. New deinition have been

written (e.g. Original Manuacturer and AssEMBLY Manu-

acturer). New compulory characteritic have to be pecifed

(e.g. rated current o the AssEMBLY).

A new deign veri ied AssEMBLY concept ha been peci-

ied. Thi new concept completely dicard the categorieTTA and PTTA, and the compliance o an AssEMBLY can now

not only be veriied by mean o tet, but alo with alterna-

tive method: calculation/meaurement and deign rule.

The new tandard i more precie, eradicating the grey

area contained in the previou tandard. The reponibilitie

or an AssEMBLY are clearly deined, making the job o each

actor on the electrical market eaier nowaday.


17/20



Note


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> Low Voltage Products and Systems

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