These circuit diagrams use the BS 7671:2001 harmonised colour coding with the triple-and-earth colours of brown, black and grey for the lines. For clarity all earth wires are omitted. They show the physical connections with • or •• as appropriate. They use brown and blue for the line and neutral feeds to the circuit. They use twin-brown and earth for the feed to the first 2-way switch. Any unused wires are terminated with the x symbol.
note: These circuits are only recommendations and the contractor remains responsible for their own work.
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