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- Light circuits are wired in a radial circuit configuration, unlike socket-outlets that can be wired in either radial or ring configuration. A radial circuit does not loop back to the MCB in the Consumer Unit or distribution board. The best cable to use in a domestic dwelling for a standard light circuit is 1.5mm square twin and earth PVC cable, supplied from typically a 5A, 10A or 16A MCB depending on the load and amount of lights on the circuit. 16A MCB's for lighting is more used in commercial dwellings where larger and more light fittings are used. This article will focus on a standard light circuit using 1.5mm PVC "
6242yh". Its not uncommon to use 1.0mm(square) cable for shorter circuits with smaller loads to save money on cable. By calculating the maximum circuit length and load you will be able to decide on what cable size the best is to use. Using 1.0mm(square) cable might be a bit cheaper but considering future alterations its always better to use a 1.5mm for later extensions and adding of heavier loads. A 1.5mm square cable would typically be fed from a 5A,6A or 10A MCB and have a maximum cable length of 108, 90 and 52 meters respectively. 108 meters sound very long but once the cable is routed through your house's canvis will turn out not to be that long.
Once the radial circuit is fed through your house via each room to each light point, feed a cable(Twin and Earth) from each light point to the switch in that room.
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