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Cable Sizes for Building Installation
The following is a guide to the ratings and typical usage of fixed mains distribution wiring as used in buildings.
| Cable Size mm2 |
Current Rating Amps |
Circuit Applications |
| 1 | 16 | Lighting |
| 1.5 | 20 | Lighting and 15A single sockets |
| 2.5 | 28 | Ring main and 20A radial mains |
| 4 | 36 | 30A Radial mains |
| 6 | 46 | Cookers and Showers |
| 10 | 64 | Cookers |
| 16 | 85 | Electricity meters |
| 25 | 108 | Electricity meters |
 Safety Note |
For a detailed explanation of the cable rating the reader is advised to consult
the IEE Wiring Regulations, alternatively consult a qualified electrician. The specific installation conditions may affect the selection of the cable type and size. |