Power Cable

Power Cable-Technical Details

Single core XLPE insulated cables, non-armoured, with or without shrath (copper conductors)

Currect carrying capacity (Amperes):

BS5467
BS7211

Ambient temperature:30C
Conductor operating temperature:90C

Con-ductor cross-sectional area

Reference Method4
(enclosed in conduit in thermally insulating wall etc.)

Reference Method3 (enclosed in conduit on a wall or in trunking etc)

Reference Method1 (clipped direct)

Reference Method11 (on a perforated cable tray horizontal or vertical)

Reference Method12 (Free air)

Hori-zontal flat spaced

Vertical flat spaced

Trefoil

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 & touching

3 or 4 single-phase a.c. or d.c. flat & touching

2 cables, single-phase a.c. or d.c. flat & touching

3 or 4 cables three-phase a.c. flat & touching or trefoil

2 cables, single-phase a.c. or d.c. or 3 cables three-phase

3 cables, tre foil three-phase a.c.

mm2

50
70
95
120
150
185
240
300
400
500
630
800
1000

149
189
228
263
300
341
400
459

135
170
205
235
270
206
358
410

189
240
290
336
375
426
500
513
683
783
900

168
214
259
299
328
370
433
493
584
666
764

228
293
355
413
476
545
644
743
868
990
1130
1288
1443

209
268
326
379
436
500
590
681
793
904
1033
1179
1323

293
308
375
436
505
579
686
794
915
1044
1191
1358
1520

215
279
341
398
461
530
630
730
849
973
1115
1275
1436

274
351
426
495
570
651
469
886
1065
1228
1423
1581
1775

246
318
389
453
524
600
711
824
984
1150
1338
1485
1671

209
270
330
385
445
511
606
701
820
936
1069
1214
1349

NOTE:	1.	Where the conductor is to be protected by a semi-enclosed fuse to BS 3036, see Appendis 5(4)
	2.*	Where a conductor operates at a temperature exceeding 70C it shall be ascertained that the equipment connected to the conductor is suitable for the conductor operating temperature
	3.	Where cables in this table are connected to equipment or accessories designed to operate at a temperature not exceeding 70C, the current ratings given in the equivalent table for 700C PVC insulated cables (BS6004, BS6346) shall be used.
	4.	The current carrying capacity in columns 2 to 5 are also applicable to flexible cables to BS7211 Tables 3(b) where the cables are used in fixed installations
	5.	For cables in rigid PVC conduit, the values stated in Table A6(1) are applicable

Voltage drop (per ampere per metre):

Conductor operating temperature: 90C

Conductor crosss-sectional area

2 cables d.c.

2 cables-single phase a.c.

3 or 4 cables-three-phase a.c.

Reference Methods 3 & 4 (Enclosed in conduit etc. In or on a wall

Reference Methods 1 & 11 (Clipped direct or on trays, touching)

Reference Method 12 (Spaced*)

Reference Method 3 & 4 (Enclosed in conduit etc. In or on a wall)

Reference Methods 1, 11 & 12 (In trefoil)

Reference Methods 1 & 11 (Flat touching)

Reference Method 12 (Flat spaced*)

mm2

50
70
95
120
150
185
240
300
400
500
630
800
1000

0.99
0.68
0.49
0.39
0.32
0.25
0.190
0.155
0.120
0.093
0.072
0.056
0.045

1.00	.29	1.05
.70	.28	.75
.51	.27	.58
.41	.26	.48
.33	.26	.43
.27	.26	.37
.21	.26	.33
.175	.25	.31
.140	.25	.29
.120	.25	.28
.10	.25	.27
-	-	-
-	-	-

.99	.18	1.00
.68	.175	.71
.49	.17	.52
.39	.165	.43
.32	.165	.36
.26	.165	.30
.20	.16	.25
.16	.16	.22
.13	.155	.20
.105	.155	.185
.086	.155	.145
.072	.15	.17
.063	.15	.165

.99	.27	1.0
.68	.26	.73
.49	.26	.56
.39	.25	.47
.32	.25	.41
.25	.25	.36
.195	.25	.31
.155	.25	.29
.125	.24	.27
.098	.24	.26
.078	.24	.25
.064	.24	.25
.054	.24	.24

.87	.25	.90
.60	.24	.65
.44	.23	.50
.35	.23	.42
.29	.23	.37
.23	.23	.32
.185	.22	.29
.150	.22	.27
.125	.22	.25
.10	.22	.24
.088	.21	.23
-	-	-
-	-	-

.86	.155	.87
.59	.15	.61
.43	.145	.45
.36	.140	.37
.28	.14	.31
.22	.14	.26
.17	.14	.22
.14	.14	.195
.11	.135	.175
.09	.135	.16
.074	.135	.15
.062	.13	.145
.055	.13	.14

.86	.18	.87
.59	.175	.62
.43	.17	.46
.36	.165	.38
.28	.165	.32
.22	.165	.28
.17	.165	.24
.135	.16	.21
.11	.16	.195
.088	.16	.18
.071	.16	.17
.059	.155	.165
.05	.155	.165

.86	.26	.89
.59	.25	.65
.43	.25	.49
.34	.24	.42
.28	.24	.37
.22	.24	.33
.17	.24	.29
.135	.24	.27
.11	.24	.26
.085	.24	.25
.068	.23	.24
.055	.23	.24
.047	.23	.24

NOTE:

*Spacings larger than those specified in Method 12 (See Appendix 7) will result in larger voltage drop

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