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Conductor Colour Codes
Harmonised colours from Table 51.
Single phase
Line: brown. Neutral: blue. Protective conductor: green-and-yellow.
Three phase
L1 brown, L2 black, L3 grey, N blue. Old colours (red, yellow, blue, black) must be marked with a warning notice at the consumer unit where mixed (514.14.1).
Key regulations
Table 51514.14.1