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
Current Rating
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 cable size.


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