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Deleted member 26818
There’s nowhere in BS7671 that says Black must be used for Earth, and Grey for Neutral.
This is just an idea put forward by the NICEIC, and their reason is to disassociate Black from Neutral.
Unfortunately, they have never explained why we should disassociate Black from Neutral.
To answer the OP, use whatever colour you like, as long as you use the same colour at each end of the cable.
Identify the conductors at the terminations, either by colour or alphanumerically.
This is just an idea put forward by the NICEIC, and their reason is to disassociate Black from Neutral.
Unfortunately, they have never explained why we should disassociate Black from Neutral.
To answer the OP, use whatever colour you like, as long as you use the same colour at each end of the cable.
Identify the conductors at the terminations, either by colour or alphanumerically.