Current Carrying Capacities & Other Technical Tables

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T E C H N I C A L TA B L E S

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TABLE 17Current-carrying capacities and associated voltage drops for single-core p.v.c.insulated cable, non armoured, with or without sheath (copper conductors)

0Conductor operating temperature 70 C

Conductorcross-sectional

area

2 cable,single-phasea.c., or d.c.

3 or 4 cables,three-phase

a.c.

2 cable,single-phasea.c., or d.c.


a.c.

Flat or vertical (2cables, single-phasea.c., or d.c., or 3 or 4cables three-phase)

Trefoil(3 cables

three phase)

CurrentCarryingCapacity

Volt dropper ampereper metre







Volt drop per ampereper metre

CurrentCarryingCapacity Single

phase d.c Three

phase2mm

1.01.52.54.06.0

10.016.025.035.0

50.070.095.0

120.0150.0185.0240.0300.0400.0500.0630.0

A

1417243241557497

119

145185230260

-------

mV

42.028.017.011.07.14.22.71.71.3

0.970.710.560.48

a.c

-------

A

1214212937516687

106

125160195220

-------

d.c

0.910.630.450.36-------

mV

37.024.015.09.26.23.72.31.51.1

0.820.590.450.380.340.300.270.250.240.230.22

A

195240300350410470560660800910

1040

---------

mV

0.950.680.520.440.390.350.360.330.300.280.26

---------

mV

0.910.630.450.360.290.240.180.140.12

0.0860.068

---------

mV

0.850.620.490.430.390.360.380.350.330.310.30

---------

A

170210260300350400480570680770880

---------

mV

0.800.590.420.340.290.250.220.190.170.160.15

---------

Correction Factors:

For Ambient Temperature

0 0 0 0 0 0 0 0Ambient temperatures 25 C 35 C 40 C 45 C 50 C 55 C 60 C 65 C Correction factor 1.06 0.94 0.87 0.79 0.71 0.61 0.50 0.35

-------

mV

37.024.015.09.26.23.72.31.51.1

0.840.620.480.42

A

17213040506890

118145

175220270310355405480560680800910

mV

42.028.017.011.07.14.22.71.71.3

0.930.650.480.400.340.290.240.220.200.180.17

a.c d.c

0.910.630.450.360.290.240.180.140.120.0860.068

A

16202636456181

106130

160200240280320365430500610710820



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TABLE II

Conductorcross-sectional

area











2mm

1.01.52.54.06.0

10.016.025.035.050.0

70.095.0

120.0150.0185.0240.0300.0400.0

A mV A mV A A mV

Correction Factors:



One twin cable,with or without

protectiveconductor

single-phasea.c., or d.c.

One three-corecable, with or

without protectiveconductor, orone four-core

cable, three-phase


protectiveconductor



without protectiveconductor, or onefour-core cable,

three-phase


protectiveconductor



without protectiveconductor, or onefour-core cable,

three-phase

141824324053707998-

--------

42.028.017.011.07.14.22.71.81.3-

--------

121621293649627086-

--------

37.024.015.09.26.23.72.31.61.1-

--------

16202836466485

108132163

207251290330380450520600

mV

42.028.017.011.07.14.22.71.81.3

0.92a.c. d.c.0.65 0.640.48 0.460.40 0.360.32 0.250.29 0.230.25 0.180.23 0.140.22 0.11

A

1317243240547190

115140

176215251287330392450520


mV

37.024.015.09.26.23.72.31.61.1

0.81

0.570.420.340.290.240.200.180.17

-------

114139172

218265306348400474548632

-------

1.81.3

0.92a.c. d.c..065 0.640.48 0.460.40 0.360.32 0.250.29 0.230.25 0.180.23 0.140.22 0.11

A-------

95122148

186227265302348413474548


mV

-flat-cables

-only- "- "- "- "1.61.1

0.81

0.570.420.340.290.240.200.180.17

Current-carrying capacities and associated voltage drops for twin andmulticore p.v.c. insulated cables, non armoured, (copper conductors)


7.1


TABLE III


Correction Factors:


0 0 0 0 0 0 0 0 0 0Ambient temperatures 25 C 35 C 40 C 45 C 50 C 55 C 60 C 65 C 70 C 75 C Correction factor 1.05 0.95 0.89 0.82 0.75 0.68 0.61 0.53 0.43 0.30


A



A


mV


A


A mV

Current-carrying capacities and associated voltage drops for twin and multicorecables insulated with impregnated paper (BS 6480), lead-sheathed oraluminium-sheathed, armoured or non-armoured, with or without serving(copper conductor)


Normalcross-sectional

area ofconductor*2

One twin cable,single-phase a.c., or d.c.

One three- orfour-core cable,

three-phase

One twin cable,single-phase a.c., or d.c.


three-phase

a.c. d.c.

2mm507095

120150185240300400

165205255295335390460525610

mVmV

0.950.660.490.400.330.280.240.210.20

0.950.660.470.360.300.240.190.150.12


a.c. d.c.

mVmV

0.950.660.490.400.330.280.240.210.20

0.950.660.470.360.300.240.190.150.12

145180225260300345410470545

0.820.580.430.350.280.240.200.180.17

200250305355405465555635735

170215265305350405480550640

0.820.580.430.350.280.240.200.180.17

7.2

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TABLE IVCurrent-carrying capacities and associated volt drops andmasses supported, for flexible cords to BS 6500


area of conductor

Maximum diameter of wires

forming conductor

Current-carryingCapacity, d.c. OrSingle-phase a.c,

or three-phrase a.c.

Volt drop per ampere per metre

d.c. or single-phase a.c.

three-phase a.c.

Maximum mass supportableby twin flexible cord

(see IEE Regulation 523-32)

2mm0.5

0.751.0

1.251.52.54.0

mV0.210.210.210.260.260.260.31

A36

1013152025

mV 83564335311811

mV 72.048.037.029.026.016.09.6

Kg2355555

Correction factor for ambient temperature

600C rubber and p.v.c cords

Ambient temperature 350C 400C 450C 500C 550CCorrection factor 0.96 0.92 0.87 0.71 0.50

850C rubber cords having a h.o.f..r. sheath or a heat-resisting p.v.c sheath

Ambient temperature 350C 550C 600C 650C 700C To 500C Correction factor 1.0 0.96 0.83 0.67 0.47

1500C rubber cords

Ambient temperature 350C 1250C 1300C 1350C 1400C 1450C To 1200C Correction factor 1.0 0.96 0.85 0.74 0.60 0.42

Glass-fibre cords

Ambient temperature 350C 1550C 1600C 1650C 1700C 1750C To 1500C

7.3


TABLE VCurrent-carrying capacities and associated voltage drops for single-corep.v.c insulated cables, non-armoured, with sheath (aluminium conductors)


Correction Factors:














2mm A mV


area ofconductor

2 cable,single phasea.c., or d.c.


a.c.

2 cable,single phasea.c., or d.c.


a.c.

Flat or vertical(2 cables,

single-phasea.c., or d.c.,

or 3 or 4 cablesthree-phase)

Trefoil(3 cables

three-phase)

162535507095

120150185240300380480600

A

607896

120150175205235

------


a.c d.c

mV

4.52.92.11.61.2

0.930.800.73

------

mV

4.52.82.01.51.0

0.750.600.49

------

526783

100125150175200

------

3.92.51.81.41.0

0.800.700.64

------

A

7294

115143181223261298345411476554643737

mV

4.52.82.11.51.1

0.770.620.510.420.340.290.260.230.21

mV

4.52.82.01.51.0

0.750.600.490.390.290.230.190.150.12

A

6585

105123156193225259290361419465541616

mV

3.92.51.81.3

0.930.690.560.480.400.340.300.280.260.24

A

---

155190235275320370440510584677776

A

---

140170205235270310370435490570648

mV

---

1.30.900.670.540.450.370.300.250.220.200.18

---

1.51.1

0.800.650.550.460.430.380.350.320.30

mV

1ph

mV

---

1.51.0

0.750.600.490.390.290.230.190.150.12

d.c.

---

1.340.950.720.600.510.450.430.390.370.340.33

mV

3ph

7.4

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TABLE VI


Current-carrying capacities and associated voltage drops for twin andmulticore armoured p.v.c. insulated cables (aluminium conductors)

Correction Factors:



A


area ofconductor*2

One twin cable,single-phasea.c., or d.c.


three-phase



three-phase

2mm A

6383

100124157185

-----

mV

4.52.92.11.61.1

0.79-----

mV

4..52.92.01.51.0

0.77-----

A

556788

105138166195219257304347

mV

3..92.51.81.3

0.930.680.540.450.370.300.25

A

6687

105130165195

-----

mV

4..52.12..91.61.1

0.79-----

mV

4..32..92.01..51.0

0.77-----

587193

110145175205230270320365

mV

3..92..51..81..3

0..930.680.540.450.370.300.25

162535507095

120150185240300








a.c. d.c.


a.c. d.c.

7.5


TABLE VII

Current-carrying capacities and associated voltage drops for twin andmulticore armoured p.v.c. insulated cables (copper conductors)


Conductorcross-

sectionalarea



three-phase



three-phase

A A mV A A mV

a.c. d.c.

2mm mV









mV

1.52.54.06.0

10.016.025.035.050.0

70.095.0

120.0150.0185.0240.0300.0400.0

202937486686

115142168

209257295337390461523589

29.018.012.07.44.32.71.81.3

0.92

0.650.480.400.320.290.250.230.22

0.640.460.360.250.230.180.140.11

a.c. d.c.0.650.480.400.320.290.250.230.22

0.640.460.360.250.230.180.140.11

18243141567397

119147

180219257295333399451523

25.016.09.66.33.82.31.61.1

0.81

0.570.420.340.290.240.200.180.17

---

506990

121149180

220270310355410485550620

---

7.34.32.71.81.3

0.92

---

425877

102125155

190230270310350420475550

---

6.33.82.31.61.1

1.81

0.570.420.340.290.240.200.180.17

Correction Factors:



7.6

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TABLE VIII

LAY RATIOS FOR ALUMINIUM STANDARD CONDUCTOR

1 2 3 4 5 6 7 8 9 10 11

7

19

37

61

91

10

10

10

10

10

14

16

17

17

17

-

-

-

10

10

-

-

-

14

14

-

-

-

10

-

-

-

-

13

-10

10

10

10

-

14

16

16

16

- -

14

-

15

15

-

10

10

10

-

min max maxmin min maxmaxmin min max

Number of wires inConductor

Lay ratio

6 wire layer 12 wire layer 18-wire layer 24- wire layer 30 wire layer

7.7


TABLE IX

MassPer Km

kg

StandardDiameter

mm

CrossSectionalArea of

Standarddiameter

wire2mm

TensileStrength

2N/mm

StandardResistance

oat 20Per Km

MinimumBreakingLoad forDiameter

Wire.

N

1.70

1.80

2.10

2.25

2.50

2.67

2.80

2.89

2.96

3.10

3.23

3.25

3.40

3.78

4.22

4.39

4.65

2.27

2.55

3.46

3.98

4.91

5.60

6.16

6.56

6.88

7.55

8.19

8.30

9.08

11.22

13.99

15.14

16.98

6.13

6.87

9.35

10.7

13.26

15.117

16.63

17.72

18.58

20.40

22.13

22.42

24.54

30.33

37.81

40.91

45.90

211.5

196.5

210.7

182.1

175.5

205

201.4

198.2

193.2

178.8

166.6

165.1

163.7

160.4

160.1

160.1

159.0

12.451

11.106

8.159

7.100

5.758

5.048

4.590

4.309

4.107

3.745

3.449

3.407

3.113

2.519

2.021

1.867

1.664

480

500

730

714

862

1150

1240

1300

1320

1350

1365

1370

1490

1800

2240

2410

2700

7.8

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TABLE X

NOMINALALUMINIUM

AREA

2mm

SECTIONALAREA

2mm

TENSILESTRENGHT

2N/mm

STANDING& WIRE

DIAMETER

mm

APPROXIMATEOVERALLDIAMETER

mm

APPROXIMATEMASS PER

kg

CALCULATIONDC

RESISTANCEAT

o20 C/km

CALCULATIONBREAKING

LOAD

N

16

25

35

50

50

70

95

100

100

120

150

150

185

240

300

300

400

400

500

630

7/1.70

7/2.10

7/2.50

7/3.10

19/1.80

19/2.10

19/2.50

7/4.39

19/2.67

19/2.80

19/3.25

37/2.25

37/2.50

61/2.25

19/4.65

61/2.50

37/3.78

61/2.89

61/3.23

91/2.96

15.88

24.23

34.34

52.83

48.32

65.77

93.22

106.0

106.33

116.93

157.6

147.04

181.53

242.42

322.7

299.28

415.2

399.94

499.58

625.88

5.1

6.3

7.5

9.3

9.0

10.5

12.5

13.17

13.35

14.0

16.25

15.74

17.50

20.25

23.25

22.50

26.45

26.01

29.07

32.56

44.0

66.0

94.0

145.0

133.0

181.0

256.0

290.0

292.0

322.0

434.0

405.0

500.0

670.0

888.0

827.0

1145.0

1105.0

1380.0

1733.0

1.802

1.181

0.833

0.5419

0.595

0.437

0.308

0.2702

0.2699

0.246

0.1825

0.196

0.159

0.119

0.08916

0.097

0.6944

0.72

0.058

0.046

3,192

4,854

5,732

8,977

9,025

13,1761

15.559

16.026

20,759

22,382

24,728

25,097

30,299

39,199

48,735

47,324

63,270

71,370

74,938

108,108

201.0

200.3

166.9

166.9

186.8

200.3

166.9

151.1

195.2

191.4

156.9

170.7

166.9

161.7

151.0

158.1

152.4

178.5

150.0

172.72

7.9


TABLE XI

Test Method Property under test Requirements Insulation Sheath

A, B 2Minimum tensile strength (N/mm ), B Minimum elongation at break (%)

C. 1

C.1

C.2, C.3

Properties after ageing in air o

7 days at 80 + 2 C Tensile strength

2Minimum value (N/mm ) Minimum variation from unaged Value (%) Elongation at break Minimum Value (%) Maximum variation from unaged value (%)

2Loss of mass (max) (mg/cm )

D. 1, D.2,) D,3_)

oHot pressure test temperature ( C) Maximum deformation (%) 80+2

E.1, E.2 Heat shock test Temperature at which specimen shall not

ocrack ( C)

C.4

Non – contamination test o

7 days at 80 +2 C Tensile strength

2Minimum value (N/mm ) Maximum variation from unagedvalue (%)

Elongation at break Minimum Value (%) Maximum variation from unagedvalue (%)

Minimum insulation resistance constant (K value) at 20o C (M?KM) at 70 o C

1 2 1A 2A12.5 10 12.5 10125 150 125 150 12.5 20 125 20 2.0

10 20 150 20 2.0

12.5 20 125 20 2.0

10

20

150 20 2.0

80 +2 50

70+2 50

80+250

70+2 50

150+2

150+2

150+2 150+2

12.5 20 125 20

10 20 150 20

-- -- --- ---

-- --

--- ---

70

380

-- --

0.037 0.037 -- --

7.10 TABLE XII

Type of insulation or sheathTest

Method

B

C.2,

C.3

C.1

D.4

E.1

F.2

Property under test

2Minimum tensile strength (N/mm ) Minimum elongation at Break (%) Loss of mass after ageing 7 days at

o80+ 2 C 2(mg/cm )

Elongation at break after ageing 7 o

Days at 135 +2 C Minimum value (%) Tensile strength after ageing 7 days

oat 100 +2 C

2Minimum value (N/mm ) Maximum variation From unaged value (%) Elongation at break

oAfter ageing 7 days at 100+2 C Minimum value (%) Variation from Unaged value (%)

Maximum hot deformation (%)

Heat shock test Temperature at o

which specimen shall not crack ( C)

Minimum insulation resistance oconstant (K value) at 20 C

mSkm

3 18.5

125

-

2.0

- - - - -

30

150

350

4 7.5

150

- -

65 - - - -

65

150

0.35

5 12.5

100 -

-

65

-

-

-

-

30

150

180

6 6

125 -

2.0

-

-

-

-

-

65

150

0.0035

7 7.5

125 -

2.0

-

-

-

-

-

65

100

0.0035

8

-

7.5

150

2.0

-

-

-

-

-

65

120

0.0035

9 12.5

150 -

-

-

12.5

25

-

150

25

40

150

0.0035

7.11

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