Cable Construction
| Conductor | 1.0mm² to 1.5mm²: Class 5 tinned copper conductor according to BS EN 60228 (previously BS 6360) 2.5mm² and above: Class 2 tinned copper conductor according to BS EN 60228 (previously BS 6360) |
| Insulation | Halogen free elastomer EPR Type GP4 according to BS 7655 |
| Inner Sheath | HOFR (Heat and Oil Resistant and Flame Retardant), halogen-free elastomer Type SW4 according to BS 7655 |
| Armour | Galvanized steel wire braid* |
| Outer Sheath | HOFR (Heat and Oil Resistant and Flame Retardant), halogen-free elastomer Type SW4 according to BS 7655 |
| Bedding | Suitable tape between the braid and outer sheath |
| Note | * Tinned copper wire braid version available on request |
Dimensions
| No. of Cores | Conductor Class | Nominal Cross Sectional Area mm² | Nominal Thickness of Insulation mm | Nominal Thickness of Inner Sheath mm | Nominal Diameter of Steel Wires in Braid mm | Nominal Thickness of Outer Sheath mm | Nominal Overall Diameter mm | Nominal Weight kg/km |
|---|---|---|---|---|---|---|---|---|
| 2 | 5 | 1 | 0.8 | 1 | 0.3 | 1.2 | 11.6 | 200 |
| 2 | 5 | 1.5 | 0.8 | 1.1 | 0.3 | 1.2 | 12.4 | 241 |
| 2 | 2 | 2.5 | 0.8 | 1.1 | 0.3 | 1.2 | 13.4 | 283 |
| 2 | 2 | 4 | 1 | 1.2 | 0.3 | 1.3 | 15.6 | 387 |
| 2 | 2 | 6 | 1 | 1.2 | 0.3 | 1.4 | 16.9 | 476 |
| 2 | 2 | 10 | 1 | 1.3 | 0.3 | 1.4 | 19.2 | 627 |
| 2 | 2 | 16 | 1 | 1.4 | 0.3 | 1.5 | 22 | 853 |
| 2 | 2 | 25 | 1.2 | 1.5 | 0.3 | 1.7 | 26.1 | 1212 |
| 2 | 2 | 35 | 1.2 | 1.6 | 0.3 | 1.8 | 28.8 | 1532 |
| 2 | 2 | 50 | 1.4 | 1.7 | 0.45 | 2 | 33 | 2038 |
| 2 | 2 | 70 | 1.4 | 1.9 | 0.45 | 2.1 | 37.1 | 2680 |
| 2 | 2 | 95 | 1.6 | 2.1 | 0.45 | 2.3 | 42.2 | 3593 |
| 2 | 2 | 120 | 1.6 | 2.2 | 0.45 | 2.5 | 46.2 | 4291 |
| 2 | 2 | 150 | 1.8 | 2.3 | 0.45 | 2.6 | 50.5 | 5120 |
| 2 | 2 | 185 | 2 | 2.5 | 0.45 | 2.8 | 55.7 | 6404 |
| 2 | 2 | 240 | 2.2 | 2.8 | 0.45 | 3.1 | 62.8 | 8210 |
| 2 | 2 | 300 | 2.4 | 3 | 0.45 | 3.3 | 69.1 | 10016 |
| 3 | 5 | 1 | 0.8 | 1.1 | 0.3 | 1.2 | 12.2 | 237 |
| 3 | 5 | 1.5 | 0.8 | 1.1 | 0.3 | 1.2 | 12.9 | 263 |
| 3 | 2 | 2.5 | 0.8 | 1.1 | 0.3 | 1.3 | 14.1 | 323 |
| 3 | 2 | 4 | 1 | 1.2 | 0.3 | 1.3 | 16.3 | 439 |
| 3 | 2 | 6 | 1 | 1.2 | 0.3 | 1.4 | 17.7 | 547 |
| 3 | 2 | 10 | 1 | 1.3 | 0.3 | 1.5 | 20.4 | 743 |
| 3 | 2 | 16 | 1 | 1.4 | 0.3 | 1.6 | 23.3 | 1029 |
| 3 | 2 | 25 | 1.2 | 1.6 | 0.3 | 1.8 | 27.8 | 1515 |
| 3 | 2 | 35 | 1.2 | 1.7 | 0.45 | 1.9 | 31.4 | 2032 |
| 3 | 2 | 50 | 1.4 | 1.8 | 0.45 | 2 | 35 | 2547 |
| 3 | 2 | 70 | 1.4 | 2 | 0.45 | 2.2 | 39.6 | 3340 |
| 3 | 2 | 95 | 1.6 | 2.2 | 0.45 | 2.4 | 45.5 | 4514 |
| 3 | 2 | 120 | 1.6 | 2.3 | 0.45 | 2.6 | 49.3 | 5408 |
| 3 | 2 | 150 | 1.8 | 2.5 | 0.45 | 2.8 | 54.3 | 6587 |
| 3 | 2 | 185 | 2 | 2.7 | 0.45 | 3 | 59.9 | 8197 |
| 3 | 2 | 240 | 2.2 | 2.9 | 0.45 | 3.2 | 67 | 10475 |
| 3 | 2 | 300 | 2.4 | 3.2 | 0.45 | 3.5 | 74.1 | 12878 |
| 4 | 5 | 1 | 0.8 | 1.1 | 0.3 | 1.2 | 12.9 | 262 |
| 4 | 5 | 1.5 | 0.8 | 1.1 | 0.3 | 1.3 | 13.9 | 301 |
| 4 | 2 | 2.5 | 0.8 | 1.1 | 0.3 | 1.3 | 15.1 | 384 |
| 4 | 2 | 4 | 1 | 1.2 | 0.3 | 1.4 | 17.7 | 532 |
| 4 | 2 | 6 | 1 | 1.3 | 0.3 | 1.5 | 19.4 | 673 |
| 4 | 2 | 10 | 1 | 1.4 | 0.3 | 1.6 | 22.3 | 917 |
| 4 | 2 | 16 | 1 | 1.5 | 0.3 | 1.7 | 25.6 | 1287 |
| 4 | 2 | 25 | 1.2 | 1.7 | 0.45 | 1.9 | 31.3 | 1999 |
| 4 | 2 | 35 | 1.2 | 1.8 | 0.45 | 2 | 34.2 | 2525 |
| 4 | 2 | 50 | 1.4 | 1.9 | 0.45 | 2.2 | 38.7 | 3159 |
| 4 | 2 | 70 | 1.4 | 2.1 | 0.45 | 2.4 | 43.7 | 4226 |
| 4 | 2 | 95 | 1.6 | 2.3 | 0.45 | 2.6 | 50.2 | 5718 |
| 4 | 2 | 120 | 1.6 | 2.5 | 0.45 | 2.8 | 54.6 | 6876 |
| 4 | 2 | 150 | 1.8 | 2.7 | 0.45 | 3 | 60.1 | 8357 |
| 4 | 2 | 185 | 2 | 2.9 | 0.45 | 3.2 | 66.3 | 10406 |
| 4 | 2 | 240 | 2.2 | 3.2 | 0.45 | 3.5 | 74.6 | 13363 |
| 4 | 2 | 300 | 2.4 | 3.5 | 0.45 | 3.8 | 82.4 | 16433 |
| 5 | 5 | 1.5 | 0.8 | 1.1 | 0.3 | 1.3 | 14.8 | 351 |
| 5 | 2 | 2.5 | 0.8 | 1.2 | 0.3 | 1.3 | 16.3 | 441 |
| 7 | 5 | 1.5 | 0.8 | 1.2 | 0.3 | 1.3 | 16.8 | 452 |
| 7 | 2 | 2.5 | 0.8 | 1.2 | 0.3 | 1.4 | 18.6 | 577 |
| 12 | 5 | 1.5 | 0.8 | 1.3 | 0.3 | 1.5 | 20.1 | 621 |
| 12 | 2 | 2.5 | 0.8 | 1.4 | 0.3 | 1.6 | 22.6 | 836 |
| 19 | 5 | 1.5 | 0.8 | 1.4 | 0.3 | 1.6 | 24.1 | 888 |
| 19 | 2 | 2.5 | 0.8 | 1.5 | 0.3 | 1.7 | 27.1 | 1202 |
| 27 | 5 | 1.5 | 0.8 | 1.6 | 0.3 | 1.8 | 27.5 | 1162 |
| 27 | 2 | 2.5 | 0.8 | 1.7 | 0.45 | 1.9 | 31.4 | 1714 |
| 37* | 5 | 1.5 | 0.8 | 1.7 | 0.45 | 1.9 | 32.1 | 1608 |
* Based on Standard
Class 2 Stranded Conductors for Single Core and Multi-Core Cables
| Nominal Cross Sectional Area mm² | Minimum No. Of Wires In Conductor | Maximum Resistance of Conductor At 20ºC |
|---|---|---|
| Circular | Annealed Copper Conductor | |
| Cu | Metal-Coated Wires ohms/km | |
| 2.5 | 7 | 7.56 |
| 4 | 7 | 4.7 |
| 6 | 7 | 3.11 |
| 10 | 7 | 1.84 |
| 16 | 7 | 1.16 |
| 25 | 7 | 0.734 |
| 35 | 7 | 0.529 |
| 50 | 19 | 0.391 |
| 70 | 19 | 0.27 |
| 95 | 19 | 0.195 |
| 120 | 37 | 0.154 |
| 150 | 37 | 0.126 |
| 185 | 37 | 0.1 |
| 240 | 37 | 0.0762 |
| 300 | 61 | 0.0607 |
Class 5 Flexible 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 20°C | |
|---|---|---|---|
| Plain Wires ohms/km | Metal-Coated Wires ohms/km | ||
| 1 | 0.21 | 19.5 | 20 |
| 1.5 | 0.26 | 13.3 | 13.7 |
Current Carrying Capacity
| Nominal Cross Sectional Area mm² | Single Core Amps | 2 Core Amps | 3 and 4 Core Amps | 5 Core Amps | 7 Core Amps | 10 Core Amps | 12 Core Amps | 16 Core Amps | 19 Core Amps | 20 Core Amps | 24 Core Amps | 27 Core Amps | 30 Core Amps | 37 Core Amps |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 18 | 15 | 13 | 10.5 | 9 | 8 | 8 | 7 | 7 | 7 | 6 | 6 | 6 | 5 |
| 1.5 | 23 | 20 | 16 | 12 | 10 | 9 | 9 | 8 | 7 | 7 | 6.5 | 6.5 | 6 | 6 |
| 2.5 | 30 | 26 | 21 | 16 | 15 | 13 | 12 | 11 | 10 | 10 | 9.5 | 9 | 9 | 8 |
| 4 | 40 | 34 | 28 | - | - | - | - | - | - | - | - | - | - | - |
| 6 | 52 | 44 | 36 | - | - | - | - | - | - | - | - | - | - | - |
| 10 | 72 | 61 | 50 | - | - | - | - | - | - | - | - | - | - | - |
| 16 | 96 | 82 | 67 | - | - | - | - | - | - | - | - | - | - | - |
| 25 | 127 | 108 | 89 | - | - | - | - | - | - | - | - | - | - | - |
| 35 | 157 | 133 | 110 | - | - | - | - | - | - | - | - | - | - | - |
| 50 | 196 | 167 | 137 | - | - | - | - | - | - | - | - | - | - | - |
| 70 | 242 | 206 | 169 | - | - | - | - | - | - | - | - | - | - | - |
| 95 | 293 | 249 | 205 | - | - | - | - | - | - | - | - | - | - | - |
| 120 | 339 | 288 | 237 | - | - | - | - | - | - | - | - | - | - | - |
| 150 | 389 | 331 | 272 | - | - | - | - | - | - | - | - | - | - | - |
| 185 | 444 | 377 | 311 | - | - | - | - | - | - | - | - | - | - | - |
| 240 | 522 | 444 | 365 | - | - | - | - | - | - | - | - | - | - | - |
| 300 | 601 | 511 | 421 | - | - | - | - | - | - | - | - | - | - | - |
Ambient Air Temperature of 45°C
De-Rating Factors
| Ambient Temperature °C | 35 | 40 | 45 | 50 | 55 | 60 | 65 | 70 | 75 | 80 |
| DE-RATING FACTOR | 1.1 | 1.05 | 1 | 0.94 | 0.88 | 0.82 | 0.74 | 0.67 | 0.58 | 0.47 |
Where more than six bunched cables on cable trays, in cable conduits, pipes or trunking are to expected to operate simultaneously full rated capacity, a correction of 0.85 should be applied
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