Single Core 90°C Thermosetting Insulated Cables, Unarmoured, With or Without Sheath (COPPER CONDUCTORS)

Tables Apply to: 6491B, 6181XY

CURRENT-CARRYING CAPACITY (amperes)

Conductor Cross Sectional Area
Reference Method A (enclosed in conduit in thermally insulating wall etc.)
Reference Method B (enclosed in conduit on a wall or in trunking etc.)
Reference Method C (clipped direct)
Reference Method F (in free air or on a perforated cable tray etc horizontal or vertical etc.)
Reference Method G (in free air)
2 cables, single-phase a.c. or d.c.
3 or 4 cables, three-phase a.c.
2 cables, single-phase a.c. or d.c.
3 or 4 cables, three-phase a.c.
2 cables, single-phase a.c. or d.c. flat and touching
3 or 4 cables, three-phase a.c. flat and touching or trefoil
2 cables, single-phase a.c. or d.c. flat
3 cables, three-phase a.c. flat
3 cables, three-phase a.c. trefoil
2 cables, single-phase a.c. or d.c. or 3 cables three-phase a.c. flat
Horizontal
Vertical
1
2
3
4
5
6
7
8
9
10
11
12
(mm2)
(A)
(A)
(A)
(A)
(A)
(A)
(A)
(A)
(A)
(A)
(A)
1
14
13
17
15
19
17.5
-
-
-
-
-
1.5
19
17
23
20
25
23
-
-
-
-
-
2.5
26
23
31
28
34
31
-
-
-
-
-
4
35
31
42
37
46
41
-
-
-
-
-
6
45
40
54
48
59
54
-
-
-
-
-
10
61
54
75
66
81
74
-
-
-
-
-
16
81
73
100
88
109
99
-
-
-
-
-
25
106
95
133
117
143
130
161
141
135
182
161
35
131
117
164
144
176
161
200
176
169
226
201
50
158
141
198
175
228
209
242
216
207
275
246
70
200
179
253
222
293
268
310
279
268
353
318
95
241
216
306
269
355
326
377
342
328
430
389
120
278
249
354
312
413
379
437
400
383
500
454
150
318
285
393
342
476
4036
504
464
444
577
527
185
362
324
449
384
545
500
575
533
510
661
605
240
424
380
528
450
644
590
679
634
607
781
719
300
486
435
603
514
743
681
783
736
703
902
833
400
-
-
683
584
868
793
940
868
823
1,085
1,008
500
-
-
783
666
990
904
1,083
998
946
1,253
1,169
630
-
-
900
764
1,130
1,033
1,254
1,151
1,088
1,454
1,362
800
-
-
-
-
1,288
1,179
1,358
1,275
1,214
1,581
1,485
1,000
-
-
-
-
1,443
1,323
1,520
1,436
1,349
1,775
1,671

NOTES :

  • Where a conductor operates at a temperature exceeding 70°C it must be ascertained that the equipment connected to the conductor is suitable for the conductor operating temperature (see Regulation 512.1.2)
  • Where cables in this table are connected to equipment or accessories designed to operate at a temperature not exceeding 70°C, the current ratings given in the equivalent table for 70°C thermoplastic insulated cables (Table 4D1A) must be used (see also Regulation 523.1)

VOLTAGE DROP (per ampere per metre)

Conductor Cross Sectional Area
2 cables d.c
2 cables, single-phase a.c.
3 or 4 cables, three-phase a.c.
Reference Methods A&B (enclosed in trunking)
Reference Methods C&F (clipped direct, on tray, or in free air)
Reference Methods A&B (enclosed in conduit or trunking)
Reference Methods C,F & G (clipped direct, on tray or in free air)
Cables touching
Cables spaced*
Cables touching, trefoil
Cables touching, flat
Cables spaced*, flat
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)
1
46
46
46
46
40
40
40
40
1.5
31
31
31
31
27
27
27
27
2.5
19
19
19
19
16
16
16
16
4
12
12
12
12
10
10
10
10
6
7.9
7.9
7.9
7.9
6.8
6.8
6.8
6.8
10
4.7
4.7
4.7
4.7
4
4
4
4
16
2.9
2.9
2.9
2.9
2.5
2.5
2.5
2.5


r
x
z
r
x
z
r
x
z
r
x
z
r
x
z
r
x
z
r
x
z
25
1.85
1.85
0.31
1.9
1.85
0.19
1.85
1.85
0.28
1.85
1.6
0.27
1.65
1.6
1.165
1.6
1.6
0.19
1.6
1.6
0.27
1.65
35
1.35
1.35
0.29
1.35
1.35
0.18
1.35
1.35
0.27
1.35
1.15
0.25
1.15
1.15
0.155
1.15
1.15
0.18
1.15
1.15
0.26
1.2
50
0.99
1
0.29
1.05
0.99
0.18
1
0.99
0.27
1
0.87
0.25
0.9
0.86
0.155
0.87
0.86
0.18
0.87
0.86
0.26
0.89
70
0.68
0.7
0.28
0.75
0.68
0.175
0.71
0.68
0.26
0.73
0.6
0.24
0.65
0.59
0.15
0.61
0.59
0.175
0.62
0.59
0.25
0.65
95
0.49
0.51
0.27
0.58
0.49
0.17
0.52
0.49
0.26
0.56
0.44
0.23
0.5
0.43
0.145
0.45
0.43
0.17
0.46
0.43
0.25
0.49
120
0.39
0.41
0.26
0.48
0.39
0.165
0.43
0.39
0.25
0.47
0.35
0.23
0.42
0.34
0.14
0.37
0.34
0.165
0.38
0.34
0.24
0.42
150
0.32
0.33
0.26
0.43
0.32
0.165
0.36
0.32
0.25
0.41
0.29
0.23
0.37
0.28
0.14
0.31
0.28
0.165
0.32
0.28
0.24
0.37
185
0.25
0.27
0.26
0.37
0.26
0.165
0.3
0.25
0.25
0.36
0.23
0.23
0.32
0.22
0.14
0.26
0.22
0.165
0.28
0.22
0.24
0.33
240
0.19
0.21
0.26
0.33
0.2
0.16
0.25
0.195
0.25
0.31
0.185
0.22
0.29
0.17
0.14
0.22
0.17
0.165
0.24
0.17
0.24
0.29
300
0.155
0.175
0.25
0.31
0.16
0.16
0.22
0.155
0.25
0.29
0.15
0.22
0.27
0.14
0.14
0.195
0.135
0.16
0.21
0.135
0.24
0.27
400
0.12
0.14
0.25
0.29
0.13
0.155
0.2
0.125
0.24
0.27
0.125
0.22
0.25
0.11
0.135
0.175
0.11
0.16
0.195
0.11
0.24
0.26
500
0.093
0.12
0.25
0.28
0.105
0.155
0.185
0.098
0.24
0.26
0.1
0.22
0.24
0.09
0.135
0.16
0.088
0.16
0.18
0.085
0.24
0.25
630
0.072
0.1
0.25
0.27
0.086
0.155
0.175
0.078
0.24
0.25
0.088
0.21
0.23
0.074
0.135
0.15
0.071
0.16
0.17
0.068
0.23
0.24
800
0.056

-

0.072
0.15
0.17
0.064
0.24
0.25

-

0.062
0.13
0.145
0.059
0.155
0.165
0.055
0.23
0.24
1,000
0.045

-

0.063
0.15
0.165
0.054
0.24
0.24

-

0.055
0.13
0.14
0.05
0.155
0.165
0.047
0.23
0.24

NOTE: *Spacings larger than one cable diameter will result in a larger voltage drop.

DISCLAIMER: This information has been supplied in good faith and the upmost care has been taken to ensure the data is accurate in it's derivation from BS7671.
However, this information should not be considered as a substitute for BS7671, which should always be referred to. It remains the responsibility of the user to ensure all data and assumptions are correct and that any cable used is suitable for its intended purpose.

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