Cable construction
| Conductor | Class 5 flexible tinned copper conductor according to BS EN 60228 (previously BS 6360) |
| Insulation | 4A, 4C: EPR-HOFR (Ethylene Propylene Rubber - Heat and Oil Resistant and Flame Retardant) Type FR1 according to BS 7655 4D, 4E, 4F: EPR-HOFR (Ethylene Propylene Rubber - Heat and Oil Resistant and Flame Retardant) Type FR2 according to BS 7655 |
| Bedding | PET (Polyester Type) |
| Sheath | CPE (Chlorinated Polyethylene) rubber compound |
Dimensions - Coil End Lead TYPE 4 BS 6195 Cable
| No. of Cores | Nominal Cross Sectional Area mm² | Nominal Thickness of Insulation mm | Nominal Overall Diameter mm | Nominal Weight kg/km |
|---|---|---|---|---|
| Coil End Lead Type 4A Cable - 300/500V | ||||
| 1 | 1.5 | 0.8 | 4 | 29 |
| 1 | 2.5 | 0.9 | 4.6 | 42 |
| 1 | 4 | 1 | 5.4 | 61 |
| 1 | 6 | 1 | 6.5 | 88 |
| 1 | 10 | 1.2 | 7.9 | 141 |
| Coil End Lead Type 4C Cable - 600/1000V | ||||
| 1 | 10 | 1.5 | 8.5 | 130 |
| 1 | 16 | 1.5 | 9.6 | 190 |
| 1 | 25 | 1.6 | 8.5 | 290 |
| 1 | 35 | 1.6 | 12.8 | 380 |
| 1 | 50 | 1.7 | 14.8 | 510 |
| 1 | 70 | 1.8 | 17.2 | 750 |
| 1 | 95 | 2 | 19.7 | 935 |
| 1 | 120 | 2.2 | 21.9 | 1160 |
| 1 | 150 | 2.3 | 24.1 | 1450 |
| 1 | 185 | 2.4 | 26.3 | 1770 |
| 1 | 240 | 2.4 | 28.3 | 2260 |
| 1 | 300 | 2.6 | 33 | 2760 |
| 1 | 400 | 2.8 | 37.4 | 3880 |
| 1 | 500 | 3.2 | 38 | 4650 |
| 1 | 630 | 3.3 | 43 | 6220 |
| Coil End Type 4D Cable - 1.9/3.3kV | ||||
| 1 | 2.5 | 2.8 | 8.5 | 100 |
| 1 | 4 | 2.8 | 9.1 | 115 |
| 1 | 6 | 2.8 | 10.3 | 141 |
| 1 | 10 | 2.8 | 11.3 | 216 |
| 1 | 16 | 2.8 | 12.4 | 288 |
| 1 | 25 | 2.8 | 13.8 | 392 |
| 1 | 35 | 2.8 | 15.2 | 509 |
| 1 | 50 | 2.8 | 17.1 | 682 |
| 1 | 70 | 2.8 | 19.2 | 894 |
| 1 | 95 | 3 | 22 | 1168 |
| 1 | 120 | 3 | 23.5 | 1433 |
| 1 | 150 | 3 | 25.5 | 1734 |
| 1 | 185 | 3 | 27.5 | 2073 |
| 1 | 240 | 3 | 30.6 | 2657 |
| 1 | 300 | 3 | 33.8 | 3279 |
| 1 | 400 | 3 | 37.8 | 4229 |
| Coil End Type Lead 4E Cable - 3.8/6.6kV | ||||
| 1 | 16 | 5 | 17.2 | 408 |
| 1 | 25 | 5 | 18.6 | 527 |
| 1 | 35 | 5 | 20 | 656 |
| 1 | 50 | 5 | 22.1 | 832 |
| 1 | 70 | 5 | 24.2 | 1053 |
| 1 | 95 | 5 | 26.3 | 1304 |
| 1 | 120 | 5 | 27.8 | 1634 |
| 1 | 150 | 5 | 29.8 | 1894 |
| 1 | 185 | 5 | 32.1 | 2242 |
| 1 | 240 | 5 | 35.1 | 2842 |
| Coil End Type 4F Cable - 6.35/11kV | ||||
| 1 | 25 | 7.6 | 24.1 | 764 |
| 1 | 35 | 7.6 | 25.5 | 911 |
| 1 | 50 | 7.6 | 27.3 | 1114 |
| 1 | 70 | 7.6 | 29.4 | 1344 |
| 1 | 95 | 7.6 | 31.5 | 1610 |
| 1 | 120 | 7.6 | 33.3 | 1919 |
| 1 | 150 | 7.6 | 35.3 | 2248 |
| 1 | 185 | 7.6 | 37.3 | 2616 |
| 1 | 240 | 7.6 | 40.3 | 3252 |
Class 5 Flexible Copper Conductors for Single Core and Multi-Core Cables
| Nominal Cross Sectional Area mm² | Maximum Diameter of Wires in Conductor mm | Maximum Resistance of Conductor At 20ºC |
|---|---|---|
| Plain Wires ohms/km | ||
| 1.5 | 0.26 | 13.3 |
| 2.5 | 0.26 | 7.98 |
| 4 | 0.31 | 4.95 |
| 6 | 0.31 | 3.3 |
| 10 | 0.41 | 1.91 |
| 16 | 0.41 | 1.21 |
| 25 | 0.41 | 0.78 |
| 35 | 0.41 | 0.554 |
| 50 | 0.41 | 0.386 |
| 70 | 0.51 | 0.272 |
| 95 | 0.51 | 0.206 |
| 120 | 0.51 | 0.161 |
| 150 | 0.51 | 0.129 |
| 185 | 0.51 | 0.106 |
| 240 | 0.51 | 0.0801 |
| 300 | 0.51 | 0.0641 |
| 400 | 0.51 | 0.0486 |
| 500 | 0.61 | 0.0384 |
| 630 | 0.61 | 0.0287 |
Current Carrying Capacity in Free Air
| Nominal Cross Sectional Area mm² | Maximum Continuous Current Rating | ||
|---|---|---|---|
| Single Cable Amps | 2 Cables Bunched Amps | 3 Cables Bunched Amps | |
| 1.5 | - | 25 | 22 |
| 2.5 | - | 34 | 30 |
| 4 | - | 46 | 41 |
| 6 | - | 58 | 53 |
| 10 | - | 80 | 73 |
| 16 | - | 108 | 97 |
| 25 | 166 | 147 | 128 |
| 35 | 206 | 182 | 160 |
| 50 | 250 | 220 | 197 |
| 70 | 321 | 282 | 254 |
| 95 | 391 | 343 | 311 |
| 120 | 455 | 398 | 364 |
| 150 | 525 | 459 | 422 |
| 185 | 602 | 523 | 485 |
| 240 | 711 | 618 | 577 |
| 300 | 821 | 713 | 670 |
| 400 | 989 | 855 | 790 |
| 500 | 1140 | 986 | 908 |
| 630 | 1323 | 1141 | 1047 |
De-Rating Factors
| Ambient Temperature °C | 25 | 30 | 35 | 40 | 45 | 50 | 55 | 60 | 65 |
| DE-RATING FACTOR | 1.14 | 1.09 | 1.05 | 1.00 | 0.95 | 0.90 | 0.84 | 0.77 | 0.71 |
Ambient temperature: 40ºC
Conductor operating temperature: 90ºC
Notes
The current-carrying capacities in this appendix are based upon the following reference ambient temperatures:
1. For non-sheathed and sheathed cables in air, regardless of the installation method: 30ºC
2. For buried cables, either directly in the soil or in ducts in the ground: 20ºC
The current rating shown are based on conservative assumptions, and therefore, in some instances, may be adjusted according to the ambient installation and operating conditions.
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