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CURRENT CARRYING CAPACITIES DEPENDING ON CONDUCTOR DIAMETER
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CURREN
T C
ARRYIN
GC
APA
CITIES
C U R R E N T- C A R R Y I N GC A PA C I T I E Sa n d o t h e r
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.
3 or 4 cables,three-phase
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
CurrentCarryingCapacity
Volt dropper ampereper metre
Volt dropper ampereper metre
CurrentCarryingCapacity
Volt dropper ampereper metre
CurrentCarryingCapacity
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
Volt dropper ampereper metre
CurrentCarryingCapacity
076075MicCom
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TABLE II
Conductorcross-sectional
area
CurrentCarryingCapacity
Volt dropper ampereper metre
CurrentCarryingCapacity
Volt dropper ampereper metre
Volt dropper ampereper metre
CurrentCarryingCapacity
CurrentCarryingCapacity
Volt dropper ampereper metre
CurrentCarryingCapacity
CurrentCarryingCapacity
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:
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
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
One twin cable,with or without
protectiveconductor
single-phasea.c., or d.c.
One three-corecable, with or
without protectiveconductor, or onefour-core cable,
three-phase
One twin cable,with or without
protectiveconductor
single-phasea.c., or d.c.
One three-corecable, with or
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
Volt dropper ampereper metre
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
Volt dropper ampereper metre
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)
0Conductor operating temperature 70 C
7.1
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TABLE III
Volt dropper ampereper metre
Correction Factors:
For Ambient Temperature
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
CurrentCarryingCapacity
A
Volt drop per ampereper metre
CurrentCarryingCapacity
A
Volt dropper ampereper metre
mV
CurrentCarryingCapacity
A
CurrentCarryingCapacity
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)
0Conductor operating temperature 80 C
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.
One three- orfour-core cable,
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
Volt drop per ampereper metre
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
Normalcross-sectional
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
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TABLE VCurrent-carrying capacities and associated voltage drops for single-corep.v.c insulated cables, non-armoured, with sheath (aluminium conductors)
0Conductor operating temperature 70 C
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
CurrentCarryingCapacity
CurrentCarryingCapacity
Volt dropper ampereper metre
Volt dropper ampereper metre
CurrentCarryingCapacity
Volt dropper ampereper metre
CurrentCarryingCapacity
Volt dropper ampereper metre
CurrentCarryingCapacity
Volt dropper ampereper metre
CurrentCarryingCapacity
2mm A mV
Normalcross-sectional
area ofconductor
2 cable,single phasea.c., or d.c.
3 or 4 cables,three-phase
a.c.
2 cable,single phasea.c., or d.c.
3 or 4 cables,three-phase
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
------
Volt dropper ampereper metre
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
0Conductor operating temperature 70 C
Current-carrying capacities and associated voltage drops for twin andmulticore armoured p.v.c. insulated cables (aluminium conductors)
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
A
Normalcross-sectional
area ofconductor*2
One twin cable,single-phasea.c., or d.c.
One three- orfour-core cable,
three-phase
One twin cable,single-phasea.c., or d.c.
One three- orfour-core cable,
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
Volt dropper ampereper metre
CurrentCarryingCapacity
Volt drop per ampereper metre
CurrentCarryingCapacity
Volt dropper ampereper metre
CurrentCarryingCapacity
CurrentCarryingCapacity
a.c. d.c.
Volt drop per ampereper metre
a.c. d.c.
7.5
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TABLE VII
Current-carrying capacities and associated voltage drops for twin andmulticore armoured p.v.c. insulated cables (copper conductors)
0Conductor operating temperature 70 C
Conductorcross-
sectionalarea
One twin cable,single-phasea.c., or d.c.
One three- orfour-core cable,
three-phase
One twin cable,single-phasea.c., or d.c.
One three- orfour-core cable,
three-phase
A A mV A A mV
a.c. d.c.
2mm mV
Volt dropper ampereper metre
CurrentCarryingCapacity
Volt drop per ampereper metre
CurrentCarryingCapacity
Volt dropper ampereper metre
CurrentCarryingCapacity
CurrentCarryingCapacity
Volt drop per ampereper metre
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:
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
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
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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
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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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