| Conductor | Class 5 flexible copper conductor according to BS EN 60228 (previously BS 6360) |
| Insulation | EPR (Ethylene Propylene Rubber) Type EI4 according to BS EN 50363 |
| Sheath | PCP (Polychloroprene) Type EM2 according to BS EN 50363 |
Dimensions
| No. of Cores | Nominal Cross Sectional Area mm² | Nominal Thickness of Insulation mm | Nominal Overall Diameter mm | Nominal Weight kg/km | A2 Glands Brass | A2PL Gland Plastic |
|---|---|---|---|---|---|---|
| 1 | 1.5 | 0.8 | 5.8 | 52 | 20/16 | 20S |
| 1 | 2.5 | 0.9 | 6.5 | 67 | 20/16 | 20S |
| 1 | 4 | 1 | 7.4 | 92 | 20/16 | 20S |
| 1 | 6 | 1 | 8.1 | 119 | 20S | 20S |
| 1 | 10 | 1.2 | 9.8 | 185 | 20S | 20S |
| 1 | 16 | 1.2 | 11.35 | 258 | 20 | 20 |
| 1 | 25 | 1.4 | 13.3 | 375 | 25 | 20 |
| 1 | 35 | 1.4 | 14.6 | 485 | 25 | 25 |
| 1 | 50 | 1.6 | 17.2 | 669 | 25 | 25 |
| 1 | 70 | 1.6 | 19.35 | 892 | 32 | 32 |
| 1 | 95 | 1.8 | 22.2 | 1160 | 32 | 32 |
| 1 | 120 | 1.8 | 24.3 | 1436 | 32 | 32 |
| 1 | 150 | 2 | 25.9 | 1748 | 40 | 40 |
| 1 | 185 | 2.2 | 29.7 | 2142 | 40 | 40 |
| 1 | 240 | 2.4 | 31.5 | 2698 | 50S | 50S |
| 1 | 300 | 2.6 | 36.5 | 3348 | 50 | 50S |
| 1 | 400 | 2.8 | 40.4 | 4293 | 50 | 50 |
| 1 | 500 | 3 | 42.6 | 5262 | 50 | 50 |
| 1 | 630 | 3 | 47.2 | 6790 | 63S | 63S |
| 2 | 1 | 0.8 | 8.1 | 94 | 20S | 20S |
| 2 | 1.5 | 0.8 | 9 | 120 | 20S | 20S |
| 2 | 2.5 | 0.9 | 10.7 | 173 | 20S | 20S |
| 2 | 4 | 1 | 12.3 | 239 | 20 | 20 |
| 2 | 6 | 1 | 13.8 | 313 | 25 | 25 |
| 2 | 10 | 1.2 | 18.6 | 563 | 32 | 25 |
| 2 | 16 | 1.2 | 21.7 | 830 | 32 | 32 |
| 2 | 25 | 1.4 | 25.8 | 1211 | 40 | 40 |
| 3 | 1 | 0.8 | 8.74 | 117 | 20S | 20S |
| 3 | 1.5 | 0.8 | 9.68 | 147 | 20S | 20S |
| 3 | 2.5 | 0.9 | 11.48 | 123 | 20 | 20 |
| 3 | 4 | 1 | 13.2 | 297 | 25 | 25 |
| 3 | 6 | 1 | 14.78 | 390 | 25 | 25 |
| 3 | 10 | 1.2 | 19.9 | 705 | 32 | 32 |
| 3 | 16 | 1.2 | 23.31 | 1031 | 32 | 32 |
| 3 | 25 | 1.4 | 27.7 | 1512 | 40 | 40 |
| 3 | 35 | 1.4 | 30.2 | 1907 | 50S | 50S |
| 3 | 50 | 1.6 | 35.8 | 2651 | 50 | 50S |
| 3 | 70 | 1.6 | 40.1 | 3484 | 50 | 50 |
| 3 | 95 | 1.8 | 46.4 | 4594 | 63S | 63S |
| 4 | 1 | 0.8 | 9.63 | 142 | 20S | 20S |
| 4 | 1.5 | 0.8 | 10.63 | 180 | 20S | 20S |
| 4 | 2.5 | 0.9 | 12.6 | 260 | 20 | 20 |
| 4 | 4 | 1 | 14.6 | 336 | 25 | 25 |
| 4 | 6 | 1 | 16.4 | 449 | 25 | 32 |
| 4 | 10 | 1.2 | 21.8 | 883 | 32 | 32 |
| 4 | 16 | 1.2 | 25.4 | 1138 | 40 | 40 |
| 4 | 25 | 1.4 | 30.7 | 1714 | 50S | 50 |
| 4 | 35 | 1.4 | 33.4 | 2204 | 50S | 50 |
| 4 | 50 | 1.6 | 39.6 | 3029 | 50 | - |
| 4 | 70 | 1.6 | 44.9 | 4121 | 63 | - |
| 4 | 95 | 1.8 | 51.9 | 5361 | 63 | - |
| 5 | 1.5 | 0.8 | 11.8 | 206 | 20 | 20L |
| 5 | 2.5 | 0.9 | 14 | 297 | 25 | 25 |
| 5 | 4 | 1 | 16.2 | 422 | 25 | 25 |
| 5 | 6 | 1 | 18.2 | 567 | 32 | 32 |
| 5 | 10 | 1.2 | 24 | 1010 | 40 | 40 |
| 5 | 16 | 1.2 | 28.2 | 1400 | 40 | 40 |
| 5 | 25 | 1.4 | 33.9 | 2096 | 50S | 50 |
| 5 | 35 | 1.4 | 37.2 | 2700 | 50 | 50 |
| 5 | 50 | 1.6 | 44 | 3730 | 63S | 63S |
| 7 | 1.5 | 0.8 | 15.13 | 315 | 25 | 25 |
| 7 | 2.5 | 0.9 | 17.6 | 445 | 25 | 32 |
| 12 | 1.5 | 0.8 | 18.2 | 493 | 25 | 32 |
| 12 | 2.5 | 0.9 | 21.4 | 702 | 32 | 32 |
| 19 | 1.5 | 0.8 | 22.1 | 710 | 32 | 32 |
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 | 0.21 | 19.5 |
| 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 and Mass Supportable (1mm² to 2.5mm²)
| Nominal Cross Sectional Area mm² | Current Carrying Capacity | Maximum Mass Supportable By Twin Flexible Cable (See Regulations 522.7.2 and 559.6.1.5 of the 17th Edition of IEE Wiring Regulations) kg | |
|---|---|---|---|
| Single-Phase AC Amps | Three-Phase AC Amps | ||
| 1 | 10 | 10 | 5 |
| 1.5 | 16 | 16 | 5 |
| 2.5 | 25 | 20 | 5 |
Voltage Drop (1mm² to 2.5mm²)
| Nominal Cross Sectional Area mm² | DC or Single-Phase AC mV/A/m | Three-Phase AC mV/A/m |
|---|---|---|
| 1 | 46 | 40 |
| 1.5 | 32 | 27 |
| 2.5 | 19 | 16 |
Conductor Operating Temperature: 60°C
Current Carrying Capacity (4mm² and above)
| Nominal Cross Sectional Area mm² | 60°C Conductor Operating Temperature | 85°C Conductor Operating Temperature ** | ||||
|---|---|---|---|---|---|---|
| Single-Phase AC or DC | Three-Phase AC | Single-Phase AC or DC | Three-Phase AC | |||
| 1 Two Core Cable, With or Without Protective Conductor Amps | 2 Single Core Cables Amps | 1 Three Core, Four Core or Five Core Cable Amps | 1 Two Core Cable, With or Without Protective Conductor Amps | 2 Single Core Cables Amps | 1 Three Core, Four Core or Five Core Cable Amps | |
| 4 | 30 | - | 26 | 41 | - | 36 |
| 6 | 39 | - | 34 | 53 | - | 47 |
| 10 | 51 | - | 47 | 73 | - | 64 |
| 16 | 73 | - | 63 | 99 | - | 86 |
| 25 | 97 | - | 83 | 131 | - | 114 |
| 35 | - | 140 | 102 | - | 192 | 140 |
| 50 | - | 175 | 124 | - | 240 | 170 |
| 70 | - | 216 | 158 | - | 297 | 216 |
| 95 | - | 258 | 192 | - | 354 | 262 |
| 120 | - | 302 | 222 | - | 414 | 303 |
| 150 | - | 347 | 255 | - | 476 | 348 |
| 185 | - | 394 | 291 | - | 540 | 397 |
| 240 | - | 471 | 343 | - | 645 | 467 |
| 300 | - | 541 | 394 | - | 741 | 537 |
| 400 | - | 644 | - | - | 885 | - |
| 500 | - | 738 | - | - | 1017 | - |
| 630 | - | 861 | - | - | 1190 | - |
Ambient Temperature: 30°C
Conductor Operating Temperature: 60°C/85°C
The above table is for 60°C conductor operating temperature is in accordance with T4F1A of the 17th Edition of IEE Wiring Regulations.
** 85°C Table is in accordance with Table 4H2A of the 16th Edition of IEE Wiring Regulations.
The current ratings arranged are for cables in free air but may also be used for cables resting on the surface. If the cable is to be wound on a drum on load the ratings should be reduced in accordance with Note 2 below and for cables which may be covered, see Note 3.
Note 2: Flexible cables wound on reeling drums
The current ratings of cables used on reeling drums are to be reduced by the factors below:
A. Radial Type Drum
-Ventilated: 85%
-Unventilated: 75%
B. Ventilated Cylindrical Type Drum
-1 Layer of cable: 85%
-2 Layer of cable: 65%
-3 Layer of cable: 45%
-4 Layer of cable: 35%
A Radial Type Drum is where spiral layers of cable are accommodated between closely spaced fittings. If fitted with solid flanges the ratings given should be reduced and the drum is described as non-ventilated. If the flanges have suitable apertures the drum is described as ventilated.
A ventilated cylindrical cable drum is where layers of cable are accommodated between widely spaced flanges and the drum and end flanges have suitable ventilating apertures.
3. Where cable may be covered or coiled up whilst on load, or in air movement over the cable restricted, the current rating should be reduced.
It is not possible to specify the amount of reduction but the table of rating factors for reeling drums can be used as a a guide.
Voltage Drop (4mm² and above)
| Nominal Cross Sectional Area mm² | Two Core Cable, DC mV/A/m | Two Core Cable, Single-Phase AC mV/A/m | 1 Three Core, Four Core or Five Core Cable, Three-Phase AC mV/A/m | 2 Single Core Cables, Touching | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| DC mV/A/m | Single-Phase AC mV/A/m | ||||||||||
| 4 | 12 | 12 | 10 | - | - | ||||||
| 6 | 7.8 | 7.8 | 6.7 | - | - | ||||||
| 10 | 4.6 | 4.6 | 4 | - | - | ||||||
| 16 | 2.9 | 2.9 | 2.5 | - | - | ||||||
| 25 | 1.8 | 1.8 | 0.175 | 1.85 | 1.55 | 0.15 | 1.55 | - | - | - | - |
| 35 | - | - | - | - | 1.1 | 0.15 | 1.15 | 1.31 | 1.31 | 0.21 | 1.32 |
| 50 | - | - | - | - | 0.83 | 0.145 | 0.84 | 0.91 | 0.91 | 0.21 | 0.93 |
| 70 | - | - | - | - | 0.57 | 0.14 | 0.58 | 0.64 | 0.64 | 0.2 | 0.67 |
| 95 | - | - | - | - | 0.42 | 0.135 | 0.44 | 0.49 | 0.49 | 0.195 | 0.53 |
| 120 | - | - | - | - | 0.33 | 0.135 | 0.36 | 0.38 | 0.38 | 0.19 | 0.43 |
| 150 | - | - | - | - | 0.27 | 0.13 | 0.3 | 0.31 | 0.31 | 0.19 | 0.36 |
| 185 | - | - | - | - | 0.22 | 0.13 | 0.26 | 0.25 | 0.25 | 0.19 | 0.32 |
| 240 | - | - | - | - | 0.17 | 0.13 | 0.21 | 0.19 | 0.195 | 0.185 | 0.27 |
| 300 | - | - | - | - | 0.135 | 0.125 | 0.185 | 0.15 | 0.155 | 0.18 | 0.24 |
| 400 | - | - | - | - | - | - | - | 0.115 | 0.12 | 0.175 | 0.21 |
| 500 | - | - | - | - | - | - | - | 0.09 | 0.099 | 0.17 | 0.2 |
| 630 | - | - | - | - | - | - | - | 0.068 | 0.079 | 0.17 | 0.185 |
Conductor Operating Temperature: 60°C
r = Resistive Component
x = Reactive Component
z = Impedance Value
* A larger voltage drop will result if the cables are spaced
De-Rating Factors
| Ambient Temperature °C | 35 | 40 | 45 | 50 | 55 |
| DE-RATING FACTOR | 0.91 | 0.82 | 0.71 | 0.58 | 0.41 |
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