total earthing system

CLIENTCONSULTANTCONTRACTORPROJECT:PACKAGEII:DOCUMENTNAME:DOCUMENTNO. 2

SUMMARYSHEET

1 SS1SUBSTATION m 14 TRANSFERHOUSE(TH2A) m2 SS2SUBSTATION m 15 PARKINGSTATION(PS1) m3 SS3SUBSTATION m 16 PARKINGSTATION(PS2) m4 TRANSFERHOUSE(TH1) m 17 TRANSFERHOUSE(TH3) m5 SILOBUILDING m 18 TRANSFERHOUSE(TH4) m6 TAILDRIVEHOUSE m 19 TRANSFERHOUSE(TH5) m7 TRANSFERHOUSE(TH2) m 20 TRANSFERHOUSE(TH6) m8 PUMPHOUSE1 m 21 PUMPHOUSE2 m9 ATHTP1 m 22 ATHTP2 m10 ATHTP3 m 23 ATHTP4 m11 ATHTP5 m 24 ATHTP6 m12 ATHTP7 m 25 ATHTP8 m13 ATSECONDARYCRUSHER m 26 ATTRANDFERSTATION m

CalculationofoverallEarthresistanceofthetotalplant1 0

49.890

151.39

151.39

35.100

41.940

72.640

151.390

441.550

128.380

70.53

25.050

25.050

25.050

49.870

151.390

151.390

205.510

51.150

Thetotalplantisdividedintothefollowingmajorareasandthesoilresistivityconsideredforcalculation(basedonsoilreport)areasfollows

Theearthgridvaluesofeachareasiscalculatedseperatelyandalltheseareasareinterconnectedthroughearthflat.Thecombinedearthresistanceforthetotallayoutasperprojectspecificationsshallbelessthan1

128.940

35.100

44.840

228.680

70.150

26.040

37.530

35.100

REV

2

2

DOC.NO.-EL00007,REV-02 1 OF 42 SUMMARY

1.0

ReferAnnexureI ReferAnnexureX

2.0 EarthResistancearoundTransferHouseTH1ReferAnnexureII ReferAnnexureXI

3.0 EarthResistancearoundsilobuilding EarthResistancearoundTraveldrivehouseReferAnnexureXII

ReferAnnexureIII

4.0 EarthResistancearoundTransferHouseTH2 EarthResistancearoundTransferHouseTH2AReferAnnexureXIII

ReferAnnexureIV5.0 EarthResistancearoundparkingstationPS1 EarthResistancearoundparkingstationPS2

. ReferAnnexureXIVReferAnnexureV

6.0 EarthResistancearoundTransferHouseTH3 EarthResistancearoundTransferHouseTH4ReferAnnexureXV

ReferAnnexureVI7.0 EarthResistancearoundTransferHouseTH5 EarthResistancearoundTransferHouseTH6

ReferAnnexureXVIReferAnnexureVII

8.0 EarthResistancearoundPumphouse1 EarthResistanceNearTransferStationReferAnnexureVIII ReferAnnexureXVII

ReferAnnexureIX

ReferAnnexureIXA

12.0

13.0

4.46

R12

R13

R14

R6

= 0.81

EarthResistancearoundElectricalSubstationBuildingSS1R1

= 9.61

R8

R9A

EarthResistanceofdownhillconveyorDHC723atNearHTP2(TR64)

=R2 0.82

R3 = 9.61

2.85R15

=

=

=

EarthResistancearoundElectricalSubstationBuildingSS2

R11 4.61

9.61

9.61

0.29=R10

=

EarthResistancearoundElectricalSubstationBuildingSS3&EarthResistancearoundPumphouseBuilding2

10.0

11.0

9.61R4 =

R5

= 2.66

=

17.0

= 10.44 R17

=

R16

0.80

16.0

14.0

= 2.23

8.19

6.33

15.0

=

=R7

9.0

10.0 EarthResistanceofdownhillconveyorDHC723atNearHTP6(TR107)

R9B = 0.75

2

2


Note:TheOverallPlantEarthGridresistancevaluewillbereducedwhenallTailEndTH's&SSgridwillbeinterconnected.1 1 1 1 1 1 1 1 1R R1 R3 R4 R5 R8 R11 R12 R13

1 1 + 1 1 1 1 1 1 1R 0.81 9.61 9.61 9.61 10.44 4.61 9.61 9.61

1 = 0.81 + 9.61 + 9.61 + 9.61 + 10.44 + 4.61 9.61 + 9.61R 0.81 x 9.61 9.61 x 9.61 10.44 x 4.61 9.61 x 9.61

1R

1R = + + +1R

R =Finallywecalculateas Note:RefertheEarthingPit&StripSchemeforoverallplant.

EarthResistanceofoverallplantTailendside

Note:TheOverallPlantEarthGridresistancevaluewillbereducedwhenallHeadEndTH's&SSgridwillbeinterconnected.1 1 1 1 1 1 1 1 1R R2 R6 R7 R10 R14 R15 R16 R17

1 1 + 1 1 1 1 1 1 1R 0.82 2.23 2.66 0.29 4.46 2.85 8.19 6.33

1 = 0.82 + 2.23 + 2.66 + 0.29 + 4.46 + 2.85 8.19 + 6.33R 0.82 x 2.23 2.66 x 0.29 4.46 x 2.85 8.19 x 6.331 = + +R

+ +

+

3.05 2.95 7.30 + 14.52

+

= + + + +

+ + + +

+ ++

+ ++ +

R

=

+

+

=

= +

+

+

19.2219.22

++

12.69

0.49

1

+

2.06

=

= Ohms

=

7.83

RT

0.485

= +

0.77

2.06

92.38

+ +

10.43

1.33 0.21 0.31 0.21

+15.0548.1492.38

51.861.83

2


R

1R = + + +1R

R =Finallywecalculateas Note:RefertheEarthingPit&StripSchemeforoverallplant.

EarthResistanceofoverallplantHeadendside

NOTE:1

2 Earthflatrunningthroughcabletraywillbeconsiderasinterconnectionbetweentwogridswherevergroundprofileisnothillyarea.

1.67 3.83 0.58

12.690.77

0.28

Ohms

51.86

= 6.36

R = 16.36

1.83

Thecalculatedearthpitqty.areminimumtobeprovidedatsite.Howeveraspersitecondition,theoverallresistanceisnotachivedlessthan1 withaboveearthpitqtythanadditionalpitsshallbeprovidedtomeettheoverallgridresistancelessthan1.

0.157

RT = 0.162


IEC:60364-5-54 = ENTER THE VALUE IN YELLOW COLOR BOXES ONLYIS:3043STEP-1 : BASIC DESIGN DATA

SYSTEM DATA

System nominal voltage MV Voltage kV

The operating time of the protective device for automatic disconnection in s; sec

Fault clearing time sec

System nominal voltage LV Voltage kV


Earthing Conductor Data

Earth Electrode Material (Rod or Pipe)

Volumetric heat capacity of conductor material J/0C mm3

(J/oC mm3) at 20oC

Reciprocal Of temp.Cofficient of resistivity at O 0C C

for the conductor (2020C as IEC 60364-5-54)

Electrical resistivity of conductor material at 200C -mm

Initial temperature of conductor (40 0C)

Final temperature of conductor (200 0C) C

Minimum Cross sectional area required = AAs per IEEE - 80 ,the minimum cross sectional area of the earthing conductor to withstand the Short circuit current is given by

A = Is the cross-sectional area, in mm2;

If =

t = is the operating time of the protective device for automatic disconnection in s;

=1.05 Vs 0.415

kA

1.07 tsc = 1

1.06The value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which can flow through the protective device for LV System (see IEC 60909-0);

If=

50

is the value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which can flow through the protective device (see IEC 60909-0);

3.00

2.05 i = 452.06 f = 500

CALCULATION FOR SIZING OF EARTH CONDUCTOR BASED ON 11KV SYSTEM

2.03 = 202

2.04 20 = 138x10-6

2.00

2.02 QC = 3.8 x 10-3

2.01 Pipe = Steel

1.04 tsc = 1

kA

1.03 ts = 1

1.02The value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which can flow through the protective device for HV System (see IEC 60909-0);

If=

25

1.00

1.01 Vs = 11

CALCULATION OF MAIN GRID CONDUCTOR & EARTHING STRIP

REFERENCE

DOC.NO.-EL00007,REV-02 6 OF 42 MAIN CONDUCTOR SIZING

t is the operating time of the protective device for automatic disconnection in s;

k =

A =

The factor of K is determine from the formula (Annex A - IEC - 60364-5-54)

The value of k = for steel as per ,Table A.54.1 of IEC 60364-5-54

500 -202 +

k =

Therefore ,the area of conductor for the maximum fault level of 40A and consider the fault clearingtime is < 0.5 sec.the conductor area is

Considering 15% corrosion allowance of the strip will be

Hence the calculated minimum diameter of the GI rod Hence the calculated minimum width & Thickness of the Earthing strip

Earthing Conductor(strip) width = mm

Earthing Conductor(strip) Thickness = mm

x 4

Considering 15% corrosion allowance the diameter of the MS rod will be 32mm will be sufficientHowever we will select a standard size of 100mm MS rod for the main earth mat below ground as per contract specifications.

D = 20 mm

D = 100 mm

10

D =A x 4

D =306

3.142

351.63 Sq.mm

A = D/4

However as per TS 75x10mm strip shall be used for main earthing grid.

40X

A = 306 Sq.mm A =

81.76

25000 X 1A = 81.76

45= 80 x 1.045

45k =

80 xln

1 +

20 + i

=Qc( + 20C)

20

80

is the factor dependent on the material of the protective conductor, the insulation and is the factor dependent on the material of the protective conductor, the insulation and

(If t)k

k =Qc( + 200C)

ln 1+f - i

2


TRANSFER STATION GROUNDING CALCULATION

ANNEXURE-XVIIREFERENCE

DOC.NO.-EL00007,REV-02 41 OF 42 TRANSFER STATION


SYSTEM DATA

System nominal voltage V


1.00

1.01 Vs = 415

1.02 The value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which can flow through the protective device (see IEC 60909-0);

If=

50 kA

1.03 ts = 1

0 tFault clearing time sec

Length and breadth of the earth grid around Substation x 5.5 m

Area of earth grid around Substation m2

Resistivity of the soil

Design Ambient temperature C

Buried earth conductor (strip)

Length of burial of Earthing Strip cm

D th f b i l f d t (St i )

1.04 tsc = 1

1.05 L x B = 7.5

1.06 A = 41.25

1.07 = 49.89 -m1.09 Ta = 45

2.00

2.01 L = 2600.0

2 02 80Depth of burial of conductor (Strip) cm

Width (Incase of strip) of the conductor (Strip) cm

Earth conductor (Rod or Pipe)


Length of earth electrode rod/pipe Mtr.

Diameter of earth electrode rod/pipe mm

Resistance of Buried earth conductor (Strip)

Th i t f th id b l l t d b i th f l

2.02 = 802.03 t = 7.50

2.04

2.05 Pipe = G.I.Pipe

2.06 l = 3

2.07 d = 100

2

2

The resistance of earth grid can be calculated by using the formulaAs per IS:3043 clause no.9.2.3

L = Length of the Strip (in Cm)

= Depth of burial of the Earthing strip cmt = Width(incase of Strip) or twice the diameter(fir Conductors) in cm. = Resistivity of the soil in m

Rg = Resistance of the earth conductor

R ( 100 x ) ln ( 2 x L )

The resistance of the earth Conductor (Strip)

Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =(100 x 49.89)

ln(2 x 6760000)

(2 x 3.142 x 2600) (80 x 7.5)

Rg = 0.305354 X 10.023

Rg = 3.06

Rg = 3.06 ohmsRg


Resistance of earth Electrode (Steel Rod Or Pipe)As per IS:3043 clause no.9.2.2

l = Length of rod or Pipe (in Cm)

d = Diameter of rod or pipe in cm

= Resistivity of the soil in m


Resistivity of the soil in mRe = Resistance of the earth Electrode

The resistance of earth electrode is given by

ld

30010

Re =( 100 x )

ln 4 x( 2 x x l)

Re =(100 x 49.89)

ln 4 X(2 x 3.142 x 300)

Re = 2.646404 X 4.787

Re = 12.67

The resistance of the earth electrode

The overall earth resistance of Electrodes:-

1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn

Re = 12.67

Re = 12.67 ohms

= + ------ +

=1

+1

+1

---------------------12.67 12.67 12.67

Finally we calculate as

R1- Total Resistance of Earth Electrodes(pits) (Re) 6.33 Refer Annexure-VI

R2 - Total Earth Resistance of the buried Conductor (Rg) 3.06

1 1 1R R1 R2

1 1

Add no. of pits n 2 = 6.33 Ohmsthe Combined value of n pits R18

= +

1

2

1 1R 3.06

Hence the combined resistance of grid + Earth pits

x R2 6.33 x6.33 +

=1

+6.33

R =R1

=3.06

R1 + R23.06

R18A

R =19.399.40

= 2.06 Ohms


Minimum Cross sectional area required = AAs per IEEE - 80 ,the minimum cross sectional area of the earthing conductor to withstand the Short circuit current is given by

A = Is the cross-sectional area, in mm2;

If =

t = is the operating time of the protective device for automatic disconnection in s;

k =

A =

The factor of K is determine from the formula (Annex A - IEC - 60364-5-54)

The value of k = for steel as per ,Table A.54.1 of IEC 60364-5-54

500 -202 +

k =

Therefore ,the area of conductor for the maximum fault level of 40A and consider the fault clearingtime is < 0.5 sec.the conductor area is

Considering 15% corrosion allowance of the strip will be

Hence the calculated minimum diameter of the MS Rod Hence the calculated minimum width & Thickness of the Earthing strip

Earthing Conductor(strip) width = mm

Earthing Conductor(strip) Thickness = mm

4.00 CALCULATION FOR SIZING OF EARTH CONDUCTOR BASED ON LV SYSTEM

is the value (r.m.s) in A of prospective fault current for a fault of negligible impedance, which can flow through the protective device (see IEC 60909-0);

is the factor dependent on the material of the protective conductor, the insulation and is the factor dependent on the material of the protective conductor, the insulation and

(If t)k

k = Qc( + 200C) ln 1+

f - i20 + i

=Qc( + 20C)

20

80 x 1.04545

80

k =80 x

ln

A = 81.76

1 +45

=

Sq.mm A =

81.76

50000 X 1

703.26 Sq.mm

A = D/4 70X

A = 612

10

D =A x 4


Hence ,1R x 75 x10Sqmm GI.strip shall be used for main x 4 earthing grid as per NIT

Considering 15% corrosion allowance the diameter of the GI pipe will be 32mm.However we will select a standard size of 100mm GI pipe for the main earth mat below ground as per contract specifications

Conculation:-

from the above calculations,we concluded that the required size of main earthing conductor for LV system is higher than that of HV(11kv system)Hence the size of earth conductor of main grid is selected based on LV system earthing calculation

The conductor selected for main earth is 1 Run of 75 x 10mm GI flat as per NIT.The earthing Electrode selected for earth pit is 100mm dia & 3mtr.as per NIT

D612

3.142

D = 28 mm

=

D = 100 mm

6.00

5.00


IEC:60364-5-54 = ENTER THE VALUE IN YELLOW COLOR BOXES ONLYIS:3043

STEP-1 : BASIC DESIGN DATA

SYSTEM DATA










Depth of burial of conductor (Strip) cm




Length of earth electrode rod/pipe Mtr




SS-1-ELECTRICAL SUBSTATION GROUNDING CALCULATION

ANNEXURE-IREFERENCE

1.00

tsc

1.05 L x B = 15.5

-m1.06 A = 551.8

1.08 Ta = 45

1.07 = 70.53

2.00

2.01 L = 10220.0

2.02 = 802.03 t = 7.50

3.00


3.02 l = 3

3.03 d = 100

kA

1.03 ts = 1

1.04 = 1

If

= 415

=50

1.01 Vs


2

2

DOC.NO.-EL00007,REV-02 8 OF 42 SS-1


= Depth of burial of the Earthing strip cm

t = Width(incase of Strip) or twice the diameter(fir Conductors) in cm. = Resistivity of the soil in m



Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =(100 x 70.53)

ln(2 x 104448400)

(2 x 3.142 x 10220) (80 x 7.5)

= 0.109821 X 12.760

Rg = 1.40 ohms

Rg =

Rg

1.40

2





= Resistivity of the soil in mRe = Resistance of the earth Electrode


ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


add all transformer body&neutral earth pit

R1- Total Resistance of Earth Electrodes(pits) (Re) 0.81 Refer Annexure-I


1 1 1R R1 R2

(2 x 3.142 x 300)

Re =

3.741248 X

( 100 x )

4.787

Re =(100 x 70.53)

ln 4 X

Re = 17.91

Re = 17.91 ohms

Re =

= + ------ +

=1

+1

+1

---------------------17.91 17.91 17.91


= +

ln 4 x( 2 x x l)

2

2


1 1R 1.40


x R2 0.81 x0.81 +

R1A

=1

+0.81

=R1

=1.40

R1 +

= 0.51

R21.40

R =1.14

2.22

Ohms

R

2



SYSTEM DATA


















2.07 d = 100

2.04


2.06 l = 3

2.02 = 802.03 t = 7.50

1.09 Ta = 45

2.00

2.01 L = 10220.0

1.07 = 25.05 -m

1.06 A = 551.8

1.05 L x B = 15.5

kA

1.03 ts = 1

1.04 tsc = 1


If=

50

1.00

1.01 Vs


ANNEXURE-XREFERENCE

= 415

2

DOC.NO.-EL00007,REV-02 10 OF 42 SS-2

p





0.50 ohms

Rg = 0.50

Rg = 0.039005 X 12.760

Rg =

Rg =(100 x 25.05)

ln(2 x 104448400)

(2 x 3.142 x 10220) (80 x 7.5)

Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

DOC.NO.-EL00007,REV-02 10 OF 42 SS-2






ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


add all transformer body&neutral earth pit

R1- Total Resistance of Earth Electrodes(pits) (Re) 0.29 Refer Annexure-X


1 1 1R R1 R2

1 1

= +

=1

+


1---------------------

6.36 6.36 6.36

= + ------ +

=1

+1

+

Re = 6.36

Re = 6.36 ohms

Re =

Re =(100 x 25.05)

ln 4 X

4 x( 2 x x l)

1.328771 X 4.787

(2 x 3.142 x 300)

Re =( 100 x )

ln

2

2

DOC.NO.-EL00007,REV-02 11 OF 42 SS-2

R 0.50


x R2 0.29 x0.29 +

R =0.140.79

= 0.18 OhmsR10A

R =R1

=0.50

R1 + R20.50

= +0.29

2

DOC.NO.-EL00007,REV-02 11 OF 42 SS-2


SYSTEM DATA














Length of earth electrode rod/pipe Mtr

Diameter of earth electrode rod/pipe mm2.07 d = 100

2.04


2.06 l = 3

2.02 = 802.03 t = 7.50

1.09 Ta = 45

2.00

2.01 L = 4465.0

1.07 = 25.05 -m1.06 A = 102.8625

1.05 L x B = 6.5

1.03 ts = 1

1.04 tsc = 1


If=

50 kA

1.01 Vs = 415

1.00


ANNEXURE-IIREFERENCE

2

DOC.NO.-EL00007,REV-02 12 OF 42 SS-3




= Depth of burial of the Earthing strip cmt = Width(incase of Strip) or twice the diameter(fir Conductors) in cm. = Resistivity of the soil in mRg = Resistance of the earth conductor


0.99 ohms

Rg = 0.99

Rg = 0.089279 X 11.104

Rg =

Rg =(100 x 25.05)

ln(2 x 19936225)

(2 x 3.142 x 4465) (80 x 7.5)

Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

DOC.NO.-EL00007,REV-02 12 OF 42 SS-3






ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


Add Pump House-2 earth pit

RA- Total Resistance of Earth Electrodes(pits) of SS-3 (Re) 0.91 Refer Annexure-II

RB- Total Resistance of Earth Electrodes(pits) of Pump House-2 (Re) 8 30

Add no. of pits n 7 the Combined value of n pits - (RA) = 0.91 Ohms

1---------------------

6.36 6.36 6.36

= + ------ +

=1

+1

+

Re = 6.36

Re = 6.36 ohms

Re =

Re =(100 x 25.05)

ln 4 X

4 x( 2 x x l)

1.328771 X 4.787

(2 x 3.142 x 300)

Re =( 100 x )

ln

2

DOC.NO.-EL00007,REV-02 13 OF 42 SS-3

RB- Total Resistance of Earth Electrodes(pits) of Pump House-2 (Re) 8.30

1 1 1R R1 R2

1 1R 8.30


x R2 0.91 x0.91 +

R = 7.549.21

R2 = 0.82 Ohms

R = R1 = 8.30

R1 + R28.30

= +

= 1 +0.91

2

DOC.NO.-EL00007,REV-02 13 OF 42 SS-3



SYSTEM DATA




Length and breadth of the earth grid around Substation x 8 m













TRANSFER HOUSE (TH-1) GROUNDING CALCULATION

ANNEXURE-XIREFERENCE

1.00

1.01 Vs = 415


If=

50 kA

1.03 ts = 1

1.04 tsc = 1

1.05 L x B = 11

1.06 A = 88

1.07 = 72.64 -m1.09 Ta = 45

2.00

2.01 L = 3800.0

2.02 = 802.03 t = 7.50

2.04


2.06 l = 3

2.07 d = 100

2

2

DOC.NO.-EL00007,REV-02 14 OF 42 TH-1







(80 x 7.5)

Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

0.304198 X 10.782

Rg =(100 x 72.64)

ln(2 x 14440000)

(2 x 3.142 x 3800)

Rg = 3.28

Rg = 3.28 ohms

Rg =

2

DOC.NO.-EL00007,REV-02 14 OF 42 TH-1






ld

30010


The Earth resistance with numbers of Electrodes:-

1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


R1- Total Resistance of Earth Electrodes(pits) (Re) 4.61 Refer Annexure-XI


1 1 1R R1 R2

the Combined value of n pits R11Add no. of pits n

(2 x 3.142 x 300)

Re =( 100 x )

ln

Re =

4 x( 2 x x l)

3.853172 X 4.787

(100 x 72.64)ln 4 X

Re = 18.45

Re = 18.45 ohms

Re =

= + ------ +

=1

+1

+1

---------------------18.45 18.45 18.45

4 = 4.61 Ohms

= +

2

DOC.NO.-EL00007,REV-02 15 OF 42 TH-1

1 1R 3.28


x R2 4.61 x4.61 +

=1

+4.61

R =R1

=3.28

R1 + R23.28

R11A

R =15.137.89

= 4.61 Ohms2

DOC.NO.-EL00007,REV-02 15 OF 42 TH-1



SYSTEM DATA

















2.07 d = 100

2.04


2.06 l = 3

2.02 = 802.03 t = 7.50

1.09 Ta = 45

2.00

2.01 L = 4890.0

1.07 = 151.39 -m

1.06 A = 147.275

1.05 L x B = 13.7

1.03 ts = 1

1.04 tsc = 1


If=

50 kA

1.01 Vs = 415

1.00


ANNEXURE-IVREFERENCE

2

2

DOC.NO.-EL00007,REV-02 16 OF 42 TH-2







Rg = 5.56 ohms

Rg = 5.56

Rg = 0.492666 X 11.286

Rg =(100 x 151.39)

ln(2 x 23912100)

(2 x 3.142 x 4890) (80 x 7.5)

=( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )Rg

2

DOC.NO.-EL00007,REV-02 16 OF 42 TH-2






ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


R1- Total Resistance of Earth Electrodes(pits) (Re) 9.61 Refer Annexure-IV


1 1 1R R1 R2

= +

4 = 9.61 OhmsAdd no. of pits n the Combined value of n pits R4

1---------------------

38.45 38.45 38.45

= + ------ +

=1

+1

+

Re = 38.45

Re = 38.45 ohms

Re = 8.030448 X 4.787

Re =(100 x 151.39)

ln 4 X(2 x 3.142 x 300)

Re =( 100 x )

ln 4 x( 2 x x l)

2

DOC.NO.-EL00007,REV-02 17 OF 42 TH-2

1 1R 5.56


x R2 9.61 x9.61 +

R =53.4415.17

= 3.52 OhmsR4A

R =R1

=5.56

R1 + R25.56

=1

+9.61

2

DOC.NO.-EL00007,REV-02 17 OF 42 TH-2



SYSTEM DATA

















2.07 d = 100

2.04


2.06 l = 3

2.02 = 802.03 t = 7.50

1.09 Ta = 45

2.00

2.01 L = 3300.0

1.07 = 151.39 -m

1.06 A = 67.5

1.05 L x B = 9

kA

1.03 ts = 1

1.04 tsc = 1


If=

50

1.01 Vs = 415

1.00

TRANSFER HOUSE (TH-2A) GROUNDING CALCULATION

ANNEXURE-XIIIREFERENCE

2

2

DOC.NO.-EL00007,REV-02 18 OF 42 TH-2A







Rg = 7.67

Rg =

Rg = 0.730041 X 10.500

ohms

(100 x 151.39)ln

(2 x 10890000)(2 x 3.142 x 3300) (80 x 7.5)

7.67

Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =

2







ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


R1- Total Resistance of Earth Electrodes(pits) (Re) 9.61 Refer Annexure-XIII


1 1 1R R1 R2

1 1

= +

1


1---------------------

38.45 38.45 38.45

= + ------ +

=1

+1

+

Re = 38.45

Re = 38.45 ohms

Re = 8.030448 X 4.787

Re =(100 x 151.39)

ln 4 X(2 x 3.142 x 300)

Re =( 100 x )

ln 4 x( 2 x x l)

2

2


1 1R 7.67


x R2 9.61 x9.61 +

R =73.6717.28

= 4.26

R =R1

=7.67

R1 + R27.67

=1

+9.61

R13A Ohms2




SYSTEM DATA

















2.07 d = 100

2.04


2.06 l = 3

2.02 = 802.03 t = 7.50

1.09 Ta = 45

2.00

2.01 L = 4120.0

1.07 = 151.39 -m

1.06 A = 105.6

1.05 L x B = 11

kA

1.03 ts = 1

1.04 tsc = 1


If=

50

1.01 Vs = 415

1.00

SILO BUILDING GROUNDING CALCULATION

ANNEXURE-IIIREFERENCE

2

2

DOC.NO.-EL00007,REV-02 20 OF 42 SILO BUILDING







Rg = 6.40

Rg =

Rg = 0.584741 X 10.943

ohms

(100 x 151.39)ln

(2 x 16974400)(2 x 3.142 x 4120) (80 x 7.5)

6.40

Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =

2







ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


R1- Total Resistance of Earth Electrodes(pits) (Re) 9.6 Refer Annexure-III


1 1 1R R1 R2

= +

Add no. of electrode per pits 4 = 9.61 Ohmsthe Combined value of n pits R3

1---------------------

38.45 38.45 38.45

= + ------ +

=1

+1

+

Re = 38.45

Re = 38.45 ohms

Re = 8.030448 X 4.787

Re =(100 x 151.39)

ln 4 X(2 x 3.142 x 300)

Re =( 100 x )

ln 4 x( 2 x x l)

2

2


1 1R 6.40


x R2 9.61 x9.61 +

R =61.5016.01

R3A = 3.84

R =R1

=6.40

R1 + R26.40

=1

+9.61

Ohms2




SYSTEM DATA

















TAIL DRIVE HOUSE GROUNDING CALCULATION

ANNEXURE-XIIREFERENCE

1.00

1.01 Vs = 415


If=

50 kA

1.03 ts = 1

1.04 tsc = 1

1.05 L x B = 20.5

1.06 A = 338.25

1.07 = 151.39 -m1.09 Ta = 45

2.00

2.01 L = 7400.0

2.02 = 802.03 t = 7.5

2.04


2.06 l = 3

2.07 d = 100

2

DOC.NO.-EL00007,REV-02 22 OF 42 TRAVEL DRIVE HOUSE







Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =(100 x 151.39)

ln(2 x 54760000)

(2 x 3.142 x 7400) (80 x 7.5)

Rg = 0.325559 X 12.115

Rg = 3.94

Rg = 3.94 ohms







ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


R1- Total Resistance of Earth Electrodes(pits) (Re) 9.61 Refer Annexure-XII


1 1 1R R1 R2

(2 x 3.142 x 300)

Re =( 100 x )

ln 4 x( 2 x x l)

8.030448 X 4.787

Re =(100 x 151.39)

ln 4 X

Re = 38.45

Re = 38.45 ohms

Re =

= + ------ +

=1

+1

+1

---------------------38.45 38.45 38.45


= +

2

2


1 1R 3.94


x R2 9.61 x9.61 +

=1

+9.61

R =R1

=3.94

R1 + R23.94

R12A

R =37.9113.56

= 2.80 Ohms




SYSTEM DATA

















2.07 d = 100

2.04


2.06 l = 3

2.02 = 802.03 t = 7.50

1.09 Ta = 45

2.00

2.01 L = 4400.0

1.07 = 151.39 -m

1.06 A = 120

1.05 L x B = 10

kA

1.03 ts = 1

1.04 tsc = 1


If=

50

1.01 Vs = 415

1.00

PARKING STATION-1 GROUNDING CALCULATION

ANNEXURE-VREFERENCE

2

2

DOC.NO.-EL00007,REV-02 24 OF 42 PARKING STATION-1







Rg = 6.06

Rg =

Rg = 0.547531 X 11.075

ohms

(100 x 151.39)ln

(2 x 19360000)(2 x 3.142 x 4400) (80 x 7.5)

6.06

Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =

2







ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


R1- Total Resistance of Earth Electrodes(pits) (Re) 9.61 Refer Annexure-V


1 1 1R R1 R2

= +


1---------------------

38.45 38.45 38.45

= + ------ +

=1

+1

+

Re = 38.45

Re = 38.45 ohms

Re = 8.030448 X 4.787

Re =(100 x 151.39)

ln 4 X(2 x 3.142 x 300)

Re =( 100 x )

ln 4 x( 2 x x l)

2

2


1 1R 6.06


x R2 9.61 x9.61 +

R =58.2815.68

R5A = 3.72

R =R1

=6.06

R1 + R26.06

=1

+9.61

Ohms2




SYSTEM DATA

















2.07 d = 100

2.04


2.06 l = 3

2.02 = 802.03 t = 7.50

1.09 Ta = 45

2.00

2.01 L = 4400.0

1.07 = 35.1 -m

1.06 A = 120

1.05 L x B = 10

kA

1.03 ts = 1

1.04 tsc = 1


If=

50

1.00

1.01 Vs

PARKING STATION-2 GROUNDING CALCULATION

ANNEXURE-XIVREFERENCE

= 415

2

2








1.41 ohms

Rg = 1.41

Rg = 0.126946 X 11.075

Rg =

Rg =(100 x 35.1)

ln(2 x 19360000)

(2 x 3.142 x 4400) (80 x 7.5)

Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )







ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


R1- Total Resistance of Earth Electrodes(pits) (Re) 4.46 Refer Annexure-XIV


1 1 1R R1 R2

= +


1---------------------

8.91 8.91 8.91

= + ------ +

=1

+1

+

Re = 8.91

Re = 8.91 ohms

Re =

Re =(100 x 35.1)

ln 4 X

4 x( 2 x x l)

1.861871 X 4.787

(2 x 3.142 x 300)

Re =( 100 x )

ln

2

2


1 1R 1.41


x R2 4.46 x4.46 +

R =6.275.86

= 1.07 OhmsR14A

R =R1

=1.41

R1 + R21.41

=1

+4.46

2




SYSTEM DATA


















ANNEXURE-VIREFERENCE

1.00

1.01 Vs = 415


If=

50 kA

1.03 ts = 1

1.04 tsc = 1

1.05 L x B = 10.265

1.06 A = 97.5175

1.07 = 35.1 -m1.09 Ta = 45

2.00

2.01 L = 3953.0

2.02 = 802.03 t = 7.50

2.04


2.06 l = 3

2.07 d = 100

2

2

DOC.NO.-EL00007,REV-02 28 OF 42 TH-3







Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =(100 x 35.1)

ln(2 x 15626209)

(2 x 3.142 x 3953) (80 x 7.5)

Rg = 0.141301 X 10.861

Rg = 1.53

Rg = 1.53 ohms2

DOC.NO.-EL00007,REV-02 28 OF 42 TH-3






ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


R1- Total Resistance of Earth Electrodes(pits) (Re) 2.23 Refer Annexure-VI


1 1 1R R1 R2

(2 x 3.142 x 300)

Re =( 100 x )

ln 4 x( 2 x x l)

1.861871 X 4.787

Re =(100 x 35.1)

ln 4 X

Re = 8.91

Re = 8.91 ohms

Re =

= + ------ +

=1

+1

+1

---------------------8.91 8.91 8.91


= +

2

DOC.NO.-EL00007,REV-02 29 OF 42 TH-3

1 1R 1.53


x R2 2.23 x2.23 +

=1

+2.23

R =R1

=1.53

R1 + R21.53

R6A

R =3.423.76

= 0.91 Ohms2

DOC.NO.-EL00007,REV-02 29 OF 42 TH-3



SYSTEM DATA














Length of earth electrode rod/pipe cm

Diameter of earth electrode rod/pipe cm



ANNEXURE-VIIREFERENCE

1.00

1.01 Vs = 415


If=

50 kA

1.03 ts = 1

1.04 tsc = 1

1.05 L x B = 16.95

1.06 A = 211.875

1.07 = 41.94 -m1.09 Ta = 45

2.00

2.01 L = 5890.0

2.02 = 802.03 t = 7.50

2.04


2.06 l = 3

2.07 d = 100

2

2

DOC.NO.-EL00007,REV-02 30 OF 42 TH-5







Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =(100 x 41.94)

ln(2 x 34692100)

(2 x 3.142 x 5890) (80 x 7.5)

Rg = 0.113312 X 11.658

Rg = 1.32

Rg = 1.32 ohms2

DOC.NO.-EL00007,REV-02 30 OF 42 TH-5






ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


Note:- Refer the Earthing Pit & Strip Scheme for overall plant.

R1- Total Resistance of Earth Electrodes(pits) (Re) 2.66 Refer Annexure-VII

R2 T t l E th R i t f th b i d C d t (R ) 1 32

(2 x 3.142 x 300)

Re =( 100 x )

ln 4 x( 2 x x l)

2.224698 X 4.787

Re =(100 x 41.94)

ln 4 X

Re = 10.65

Re = 10.65 ohms

Re =

= + ------ +

=1

+1

+1

---------------------10.65 10.65 10.65


2

DOC.NO.-EL00007,REV-02 31 OF 42 TH-5


1 1 1R R1 R2

1 1R 1.32


x R2 2.66 x2.66 +

= +

=1

+2.66

R =R1

=1.32

R1 + R21.32

R7A

R =3.523.98

= 0.88 Ohms2

DOC.NO.-EL00007,REV-02 31 OF 42 TH-5



SYSTEM DATA


















ANNEXURE-XVIREFERENCE

1.00

1.01 Vs = 415


If=

50 kA

1.03 ts = 1

1.04 tsc = 1

1.05 L x B = 10.85

1.06 A = 70.525

1.07 = 128.94 -m1.09 Ta = 45

2.00

2.01 L = 3470.0

2.02 = 802.03 t = 7.50

2.04


2.06 l = 3

2.07 d = 100

2

2

DOC.NO.-EL00007,REV-02 32 OF 42 TH-6







Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =(100 x 128.94)

ln(2 x 12040900)

(2 x 3.142 x 3470) (80 x 7.5)

Rg = 0.591319 X 10.600

Rg = 6.27

Rg = 6.27 ohms2

DOC.NO.-EL00007,REV-02 32 OF 42 TH-6






ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn



R1- Total Resistance of Earth Electrodes(pits) (Re) 8.19 Refer Annexure-XVI


(2 x 3.142 x 300)

Re =( 100 x )

ln 4 x( 2 x x l)

6.839593 X 4.787

Re =(100 x 128.94)

ln 4 X

Re = 32.74

Re = 32.74 ohms

Re =

= + ------ +

=1

+1

+1

---------------------32.74 32.74 32.74


2

2

DOC.NO.-EL00007,REV-02 33 OF 42 TH-6


1 1 1R R1 R2

1 1R 6.27


x R2 8.19 x8.19 +

= +

=1

+8.19

R =R1

=6.27

R1 + R2 6.27

R16A

R =51.3114.45

= 3.55 Ohms2

DOC.NO.-EL00007,REV-02 33 OF 42 TH-6



SYSTEM DATA

















2.07 d = 100

2.04


2.06 l = 3

2.02 = 802.03 t = 7.50

1.09 Ta = 45

2.00

2.01 L = 3500.0

1.07 = 205.51 -m

1.06 A = 71.5

1.05 L x B = 11

kA

1.03 ts = 1

1.04 tsc = 1


If=

50

1.00

1.01 Vs

PUMP HOUSE-1 GROUNDING CALCULATION

ANNEXURE-VIIIREFERENCE

= 415

2

2

DOC.NO.-EL00007,REV-02 34 OF 42 PUMP HOUSE-1







9.92 ohms

Rg = 9.92

Rg = 0.934391 X 10.617

Rg =

Rg =(100 x 205.51)

ln(2 x 12250000)

(2 x 3.142 x 3500) (80 x 7.5)

Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

2







ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn



R1- Total Resistance of Earth Electrodes(pits) (Re) 10.44 Refer Annexure-VIII



1---------------------

52.19 52.19 52.19

= + ------ +

=1

+1

+

Re = 52.19

Re = 52.19 ohms

Re =

Re =(100 x 205.51)

ln 4 X

4 x( 2 x x l)

10.90123 X 4.787

(2 x 3.142 x 300)

Re =( 100 x )

ln

2



1 1 1R R1 R2

1 1R 9.92


x R2 10.44 x10.44 +

R =103.5520.36

= 5.09 OhmsR8A

R =R1

=9.92

R1 + R2 9.92

= +

=1

+10.44




SYSTEM DATA

















2.07 d = 100

2.04


2.06 l = 3

2.02 = 802.03 t = 7.50

1.09 Ta = 45

2.00

2.01 L = 3300.0

1.07 = 228.68 -m

1.06 A = 67.5

1.05 L x B = 9

kA

1.03 ts = 1

1.04 tsc = 1


If=

50

1.01 Vs = 415

1.00

PUMP HOUSE-2 GROUNDING CALCULATION

ANNEXURE-XVIIREFERENCE

2

2








Rg = 11.58

Rg =

Rg = 1.102753 X 10.500

ohms

(100 x 228.68)ln

(2 x 10890000)(2 x 3.142 x 3300) (80 x 7.5)

11.58

Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =

2







ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn


R1- Total Resistance of Earth Electrodes(pits) (Re) 8.30 Refer Annexure-XVII


1 1 1R R1 R2

= +

Add no. of pits n 7 the Combined value of n pits (RB) = 8.30 Ohms

1---------------------

58.07 58.07 58.07

= + ------ +

=1

+1

+

Re = 58.07

Re = 58.07 ohms

Re = 12.13028 X 4.787

Re =(100 x 228.68)

ln 4 X(2 x 3.142 x 300)

Re =( 100 x )

ln 4 x( 2 x x l)

2

2

2


1 1R 11.58


x R2 8.30 x8.30 +

R =96.0619.87

= 8.30

R =R1

=11.58

R1 + R211.58

=1

+8.30

RB Ohms2




SYSTEM DATA






Resistivity of the soil at DHC HTP-2










R i t f B i d th d t (St i )

DHC AT NEAR AREA HTP-2 (TR-64) CALCULATION

ANNEXURE-IXREFERENCE

1.00

1.01 Vs = 415


If=

50 kA

1.03 ts = 1

1.04 tsc = 1

1.05 L x B = 80

1.06 A = 800

1.07 = 70.15 -m1.09 Ta = 45

2.00

2.01 L = 18000.0

2.02 = 802.03 t = 7.50

2.04


2.06 l = 3

2.07 d = 100







Rg =( 100 x )

ln( 2 x L )

( 2 x x L) ( x t )

Rg =(100 x 70.15)

ln(2 x 324000000)

(2 x 3.142 x 18000) (80 x 7.5)

Rg = 0.062018 X 13.892

Rg = 0.86

Rg = 0.86 ohms






ld

30010



1 1 1 1 1R R1 R2 Rn-1 Rn

1 1R Rn



R1 T t l R i t f E th El t d ( it ) R1 (R ) 0 89

Re =( 100 x )

ln 4 x( 2 x x l)

Re =(100 x 70.15)

ln 4 X(2 x 3.142 x 300)

Re = 3.721091 X 4.787

Re = 17.81

Re = 17.81 ohms

= + ------ +

=1

+1

+1

---------------------17.81 17.81 17.81

Add no. of pits n 20 the Combined value of n pits = 0.89 Ohms

R1- Total Resistance of Earth Electrodes(pits) R1 (Re) 0.89 Refer Annexure-IX

R2 - Total Earth Resistance of the buried Conductor R2 (Rg) 0.86

1 1 1R R1 R2

1 1R 0.86


x R2 0.89 x0.89 +

Resistance of earth conductor (Strip) riser & DHC gantry strip at HTP-3 to HTP-6


l = Length of the Strip (in m) = m

A = Area of the earth conductor strip = 75 x 10 750 Sqmm = Resistivity of the GI conductor in m Rg = Resistance of the earth conductor

x 10-6


= +

=1

+0.89

R =R1

=0.86

R1 + R2 0.86

R =0.771.75

R3 = 0.44 Ohms

= 0.36

1950.0

138 x 10-9

Rg =( l x )

A

R4 = 0.359 ohms

Rg =(1950 x 138 x 10-9)

750

Rg

R3- Total Resistance of Earth Electrodes(pits)+Grid Strip R3 = (Re)

R4 - Total Earth Resistance of the along the conveyor earth strip R4 = (Rg)

R = + R4

= + 0.36

=

Hence the combined resistance of grid + Earth Strip

0.36

0.44

R3

0.44

R9A = 0.80 Ohms

0.80

CLIENTCONSULTANTCONTRACTORPROJECT:PACKAGEII:DOCUMENTNAME:DOCUMENTNO. REV.SIZINGOFPLANTEARTHINGCONDUCTOR

SR.NO. DESCRIPTIONNO.OFEARTHCONNECTION

SIZEOFEARTHINGCONDUCTOR(SQMM)

NOOFRUNPERCONNECT

ION

CONDUCTORTYPE REMARKS

A MainGridandConnectivitytoPlantearthing1 Substation1(SS1) 75x10mm 1 GIFlat2 Substation2(SS2) 75x10mm 1 GIFlat3 S b t ti 3 (SS 3) 75 10 1 GI Fl t3 Substation3(SS3) 75x10mm 1 GIFlat4 TransferHouse(TH1) 75x10mm 1 GIFlat5 TransferHouse(TH2) 75x10mm 1 GIFlat6 TransferHouse(TH2A) 75x10mm 1 GIFlat7 SiloBuilding 75x10mm 1 GIFlat8 TaildriveHouse 75x10mm 1 GIFlat9 TransferHouse(TH3) 75x10mm 1 GIFlat10 TransferHouse(TH4) 75x10mm 1 GIFlat11 TransferHouse(TH5) 75x10mm 1 GIFlat12 Transfer House (TH6) 75 x 10 mm 1 GI Flat12 TransferHouse(TH 6) 75x10mm 1 GIFlat13 Parkingstation(PS1) 75x10mm 1 GIFlat14 Parkingstation(PS2) 75x10mm 1 GIFlat15 Alongtheconv718gallarycableTray 50x6mm 1 GIFlat16 Alongtheconv719gallarycableTray 50x6mm 1 GIFlat17 Alongtheconv721gallarycableTray 50x6mm 1 GIFlat18 Alongtheconv727gallarycableTray 50x6mm 1 GIFlat19 Alongtheconv7271gallarycableTray 50x6mm 1 GIFlat20 Alongtheconv7272gallarycableTray 50x6mm 1 GIFlat21 Alongtheconv723gallarycableTray 50x6mm 1 GIFlatB Transformer1 TransformerBodyEarthing 2separate 65x10mm 1 GIFlat2 TransformerNeutralEarthing 2separate 65x10mm 1 GIFlatC HTEquipment1 6.6kvHTpanelatSS1 2separate 50x6mm 1 GIFlat2 11kvHTpanelatSS2 2separate 50x6mm 1 GIFlatD LTE i tD LTEquipment1 LTPower&ControlPanels1.1 PMCCatSS1 2separate 60x10mm 1 GIFlat1.2 PMCCatSS2 2separate 60x10mm 1 GIFlat1.3 ACVENTMCCatSS1 2separate 60x10mm 1 GIFlat1.4 ACVENTMCCatSS2 2separate 60x10mm 1 GIFlat1.5 DFDSboardatPumpHouse1 2separate 60x10mm 1 GIFlat1.6 DFDSboardatPumpHouse2 2separate 60x10mm 1 GIFlat1.8 HydraulicSystemControlPanelsbodyearth 2separate 25x6mm 1 GIFlat1 9 Lubrication System Control Panels body earth 2 separate 25 x 6 mm 1 GI Flat1.9 LubricationSystemControlPanelsbodyearth 2separate 25x6mm 1 GIFlat

DOC.NO.-EL00007,REV-02 4 OF 42 PLANT CONCUCTOR

SR.NO. DESCRIPTIONNO.OFEARTHCONNECTION

SIZEOFEARTHINGCONDUCTOR(SQMM)

NOOFRUNPERCONNECT

ION

CONDUCTORTYPE REMARKS(SQMM) ION

2 LTDistributionBoard2.1 MainLightingDistributionBoard 2separate 50x6mm 1 GIFlat2.2 WeldingDistributionBoard 2separate 50x6mm 1 GIFlat2.3 AuxiliaryPowerDistributionBoard 2separate 50x6mm 1 GIFlat2.4 LightingDistributionBoard 2separate 25x6mm 1 GIFlat2.5 FieldPowerDistributionBoard 2separate 25x6mm 1 GIFlat2.6 LocalPushButtonsBoard 2separate 25x6mm 1 GIFlat2.7 UPS,UPSdistributionBoard 2separate 25x6mm 1 GIFlat

Battery Charger & DCDB 2 separate 25 x 6 mm 1 GI FlatBatteryCharger&DCDB 2separate 25x6mm 1 GIFlat3 Electricalitems3.1 3PhaseWeldingsocketBodyearthing 2separate 16Sqmm 1 StrandedGIwire3.2 Exaustfan3.3 LightingFixture3.4 CellingFan3.5 Socket3Pin3.6 LightingJB 2separate 16Sq.mm 1 GIWire3.7 StreetLightingpoleEarthing 2separate 16Sq.mm 1 GIWire

Samesizeasphaseconductor2

g g p g p q3.8 ControlJunctionBox 2separate 6Sq.mm 1 StrandedGIwire3.9 PowerJunctionBox 2separate 6Sq.mm 1 StrandedGIwireE LTMotors1 LTMotorsupto2.2kw 2separate 6Sq.mm 1 StrandedGIwire2 LTMotors3.7kwto15kw 2separate 16Sq.mm 1 StrandedGIwire3 LTMotors15kwto45kw 2separate 25x3mm 1 GIFlat4 LTMotorsabove45kw 2separate 50x6mm 1 GIFlatF FieldInstrument1 Pullcordswitches 2separate 6Sq.mm 1 StrandedGIwire2 BeltSwaySwitches 2separate 6Sq.mm 1 StrandedGIwire3 ZerospeedSwitches 2separate 6Sq.mm 1 StrandedGIwire4 ChuteJamSwitches 2separate 6Sq.mm 1 StrandedGIwire5 BeltWeighSwitch 2separate 6Sq.mm 1 StrandedGIwire6 SlipSwitches 2separate 6Sq.mm 1 StrandedGIwire7 MonoralHoist 2separate 25x6mm 1 GIFlat8 PJBforMotors 2separate SameasMotor 1 GIFlat9 CJB for Motors 2 separate 6 Sq mm 1 Stranded GI wire9 CJBforMotors 2separate 6Sq.mm 1 StrandedGIwire

DOC.NO.-EL00007,REV-02 5 OF 42 PLANT CONCUCTOR

total earthing system

Documents