SL, N and L any good UK Electrical theory book?

There is a colour code, this changed as we harmonised with Europe, it was red, yellow and blue are phase colours, Europe was brown and two blacks, then we moved to brown, black and grey, with single phase often the phase colours are over sleeved with red (old) and brown (new) and all the phases are called collectively line, then we have neutral which was black and is now blue, so there can be a problem with the black and blue wires, but yellow has always been a phase colour.

Again earth was green but now it is green/yellow. Never has yellow been earth so what is the problem?
 
From your description, it would seem the old fitting had a supply to the passive not switched via the wall switch and a switched supply (ie override) to the lamp that was.

So, if you changed the wiring in the new fitting so the supply to it is via the wall switch, how did you preserve the override function?
 
All sorted. So I disconnected the RED from the Switch and the Bulk Head side. Used the CPC for the earth. The BulkHead end had the CPC cut short so used a spare Yellow Green to connect to CPC. Yellow (RED sleeved) is now SL.

333rocky333 said:
What colour was being used as neutral, was it blue.
Click to expand...
Yes
 
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