Multicore 90°C Thermosetting Insulated and Thermoplastic Sheathed Cables, Non Armoured (COPPER CONDUCTORS)

Tables Apply to: 6241B, H6242B, H6243B

CURRENT-CARRYING CAPACITY (amperes)

Conductor Cross Sectional Area
Reference Method A
Reference Method B
Reference Method C (clipped direct)
Reference Method E (free air or on a perforated cable tray etc horizontal or vertical)
(enclosed in conduit in thermally insulating wall etc.)
(enclosed in conduit on a wall or in trunking etc.)
1 two-core cable*, single-phase a.c. or d.c.
1 three- or four-core cable*, three-phase a.c.
1 two-core cable*, single-phase a.c. or d.c.
1 three- or four-core cable*, three-phase a.c.
1 two-core cable*, single-phase a.c. or d.c.
1 three- or four-core cable*, three-phase a.c.
1 two-core cable*, single-phase a.c. or d.c.
1 three- or four-core cable*, three-phase a.c.
1
2
3
4
5
6
7
8
9
(mm2)
(A)
(A)
(A)
(A)
(A)
(A)
(A)
(A)
1
14.5
13
17
15
19
14
21
18
1.5
18.5
16.5
22
19.5
24
22
26
23
2.5
25
22
30
26
33
30
36
32
4
33
30
40
35
45
40
49
42
6
42
38
51
44
58
52
63
54
10
57
51
69
60
80
71
86
75
16
76
68
91
80
107
96
115
100
25
99
89
119
105
138
119
149
127
35
121
109
146
128
171
147
185
158
50
145
130
175
154
209
179
225
192
70
183
164
221
194
269
229
289
246
95
220
197
265
233
328
278
352
298
120
253
227
305
268
382
322
410
346
150
290
259
334
300
441
371
473
399
185
329
295
384
340
506
424
542
456
240
386
346
459
398
599
500
641
538
300
442
396
532
455
693
576
741
621
400
-
-
625
536
803
667
865
741

* with or without a protective conductor.

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 4D2A) must be used (see also Regulation 523.1)

VOLTAGE DROP (per ampere per metre)

Conductor Cross Sectional Area
Two-core cable d.c.
Two-core cable single-phase a.c.
Three- or four-core cable, three-phase a.c.
1
2
3
4
(mm2)
(mV/A/m)
(mV/A/m)
(mV/A/m)
1
46
46
40
1.5
31
31
27
2.5
19
19
16
4
12
12
10
6
7.9
7.9
6.8
10
4.7
4.7
4
16
2.9
2.9
2.5


r
x
z
r
x
z
25
1.85
1.85
0.16
1.9
1.6
0.14
1.65
35
1.35
1.35
0.155
1.35
1.15
0.135
1.15
50
0.98
0.99
0.155
1
0.86
0.135
0.87
70
0.67
0.67
0.15
0.69
0.59
0.13
0.6
95
0.49
0.5
0.15
0.52
0.43
0.13
0.45
120
0.39
0.4
0.145
0.42
0.34
0.13
0.37
150
0.31
0.32
0.145
0.35
0.28
0.125
0.3
185
0.25
0.26
0.145
0.29
0.22
0.125
0.26
240
0.195
0.2
0.14
0.24
0.175
0.125
0.21
300
0.155
0.16
0.14
0.21
0.14
0.12
0.185
400
0.12
0.13
0.14
0.19
0.115
0.12
0.165

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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