Quote:
Originally Posted by TonyDuell
"If I see a switchboard where the incoming wires are black and blue, how do know if it's 'blue phase' on the old colours or 'black phase' on the new?"
"You check it. As you would no matter what the colours are."
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Yes, that's the best advice, don't take anything for granted.
I have found where mating old and new harmonised colour wiring in a 2-way lighting circuit, I've wrapped brown tape around the red wire, grey tape around the blue wire and black tape around the yellow wire. This hopefully avoids confusion for the next person, but still best in all cases, to prove the correct routing of any wiring.
Regards,
Symon.