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When using a 3-core cable in the new harmonised colours on a single-phase installation, which core can I use for the CPC and which for the Neutral?

April 26, 2017cable Colours core CPC Harmonised installation Neutral single-phase

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When using a 3-core cable in the new harmonised colours on a single-phase installation, which core can I use for the CPC and which for the Neutral?

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Technically, when any cable is over-sleeved or marked (with the exception of single-core green/yellow which must not be over-sleeved or marked), the over-sleeving or marking takes precedence over any colour underneath and therefore any combination can be used. However, a convention has been generally accepted of over-sleeving or marking the black with green/yellow (CPC) and the grey with blue (Neutral). This has been done with the aim of helping to disassociate the colour Black with Neutral.