Flexible Cords
Current ratings for three phase and single phase circuits and volt drop at rated current for flexible cords to BS6500.
| Conductor Cross-Sectional Area | Current-carrying capacity | Maximum Mass Supportable † | Voltage Drop per Ampere per Metre ‡ | ||
|---|---|---|---|---|---|
| Single-Phase AC | Three-Phase AC | DC or Single-Phase AC | Three-Phase AC | ||
| mm² | A | A | kg | mV/A/m | mV/A/m |
| 0.5 | 3 | 3 | 2 | 93 | 80 |
| 0.75 | 6 | 6 | 3 | 62 | 54 |
| 1 | 10 | 10 | 5 | 46 | 40 |
| 1.25 | 13 | - | 5 | 37 | - |
| 1.5 | 16 | 16 | 5 | 32 | 27 |
| 2.5 | 25 | 20 | 5 | 19 | 16 |
| 4 | 32 | 25 | 5 | 12 | 10 |
† by twin flexible cord (see regulation 522-08-06)
‡ Conductor Operating Temperature: 60°C.
The tabulated values above are for 60°C rubber-insulated and PVC-insulated flexible cords. For 85°C rubber and 90°C PVC cords they are to be multiplied by 1.09
Correction Factors for Ambient Temperature
60°C Rubber and PVC Cords
| Ambient Temperature °C | 35°C | 40°C | 45°C | 50°C | 55°C |
|---|---|---|---|---|---|
| Correction Factor | 0.91 | 0.82 | 0.71 | 0.58 | 0.41 |
85°C rubber cords having a HOFR sheath or a heat resisting PVC sheath and for 85°C and 90°C heat-resisting PVC cords
| Ambient Temperature °C | 35 to 50°C | 55°C | 60°C | 65°C | 70°C |
|---|---|---|---|---|---|
| Correction Factor | 1.0 | 0.96 | 0.83 | 0.67 | 0.47 |