TABLE T3 - 1-CORE CABLES HAVING XLPE or LSHF INSULATION, ARMOURED.
(COPPER CONDUCTOR) 600/1000V
  Ambient temperature: 30°C
Ground temperature: 15°C
CURRENT- CARRYING CAPACITY (AMP) Conductor operating temperature: 90°C
Size of Conductor
Reference Method 1
(clipped direct)
Reference Method 11
(on perforated cable tray)
Reference Method 12
(free air)
In single-way ducts
Laid direct in ground
2-cables,
1-phase ac or dc flat & touching
3 or 4 cables,
3-phase ac flat & touching
2 cables,
1-phase ac or dc flat & touching
3 or 4 cables,
3-phase ac flat & touching
3 cables,
3-phase ac trefoil touching
2 cables, 1-phase ac or dc flat ducts touching
3 cables,
3-phase ac, trefoil ducts touching
2 cables, 1 phase ac or dc touching
3 cables, 3 phase ac, trefoil touching
1
2
3
4
5
6
7
8
9
10
mm²
A
A
A
A
A
A
A
A
A
50
237
220
253
232
222
255
235
275
235
70
303
277
322
293
285
310
280
340
290
95
367
333
389
352
346
365
330
405
345
120
425
383
449
405
402
410
370
460
390
150
488
437
516
462
463
445
405
510
435
185
557
496
587
524
529
485
440
580
490
240
656
579
689
612
625
550
500
670
560
300
755
662
792
700
720
610
550
750
630
400
853
717
899
767
815
640
580
830
700
500
962
791
1016
851
918
690
620
910
770
630
1082
861
1146
935
1027
750
670
1000
840
800
1170
904
1246
987
1119
828
735
1117
931
1000
1261
961
1345
1055
1214
919
811
1254
1038
 
TABLE T3a
VOLTAGE DROP (PER AMP PER METER)
Size of Conductor
2 Cables dc
2 Cables, 1-phase ac
3 or 4 cables, 3-phase ac
2 cables, 1 phase ac
3 or 4 cables,
3 phase ac,
touching
Reference Methods
1 & 11 (touching)
Reference Methods
1, 11 & 12
(in trefoil touching)
Reference Methods
1 & 11
(flat & touching)
In
ducts
In
ground
In
ducts
In
ground
1
2
3
4
5
6
7
8
9
mm²
mV/A/m
mV/A/m
mV/A/m
mV/A/m
mV/A/m
mV/A/m
mV/A/m
mV/A/m
 
 
r
x
z
r
x
z
r
x
z
 
 
 
 
50
0.98
0.99
0.21
1
0.86
0.18
0.87
0.84
0.25
0.88
1.10
0.99
0.93
0.86
70
0.67
0.68
0.20
0.71
0.59
0.17
0.62
0.60
0.25
0.65
0.80
0.70
0.70
0.61
95
0.49
0.51
0.195
0.55
0.44
0.17
0.47
0.46
0.24
0.52
0.65
0.53
0.56
0.46
120
0.39
0.41
0.190
0.45
0.35
0.165
0.39
0.38
0.24
0.44
0.55
0.43
0.48
0.37
150
0.31
0.33
0.185
0.38
0.29
0.160
0.33
0.31
0.23
0.39
0.50
0.37
0.43
0.32
185
0.25
0.27
0.185
0.33
0.23
0.160
0.28
0.26
0.23
0.34
0.45
0.31
0.39
0.27
240
0.195
0.21
0.180
0.28
0.18
0.155
0.24
0.21
0.22
0.30
0.40
0.26
0.35
0.23
300
0.155
0.17
0.175
0.25
0.145
0.150
0.21
0.17
0.22
0.28
0.37
0.24
0.32
0.21
400
0.115
0.145
0.170
0.22
0.125
0.150
0.195
0.160
0.21
0.27
0.35
0.21
0.30
0.19
500
0.093
0.125
0.170
0.21
0.105
0.145
0.180
0.145
0.20
0.25
0.33
0.20
0.28
0.18
630
0.073
0.105
0.165
0.195
0.092
0.145
0.170
0.135
0.195
0.24
0.30
0.19
0.26
0.17
800
0.056
0.09
0.160
0.190
0.086
0.140
0.165
0.130
0.180
0.23
0.28
0.18
0.24
0.16
1000
0.045
0.092
0.155
0.180
0.080
0.135
0.155
0.125
0.170
0.21
0.26
0.17
0.22
0.15
Note: r = conductor resistance at operating temperature,
z = impedance, x = reactance