Lights off a Fire Alarm

I never said it was terribly uncommon. That isn't the same thing as it not being an allowable practice.
But with the level of inspections that took place in the new school building, nothing went unnoticed. They insisted sockets were raised by about 4inches in many rooms which invooled loads of work for Sparks, plasterers, floorers and decorators. I'm sure that non compliant wiring colours would have been rejected.
 
I just checked a 14th regs 1976
it says

Table B5.4A

Live of ac single phase circuit - red (or yellow or blue *)

then below the table it says

* as alternatives to the use of red, if desired, in large instalations, up to the final distribution board.
So ristaerd, I take it the words UP TO seems your correct at least after 1976
Im sure Securespark has an older edition
 
I know I am!

It is a common misconception that it was allowed.
Yep I bow to the information offered here. I have spoken to a colleague who has an incomplete selection of books back to 8th (he is 3rd of 4 generations of sparks), He says it looks like it changed around the time ph3 changed from green to blue in the 50's. His words, not mine so please no backlash. He also added that he did a lot of schools work and the spec was for phase colours to be used throughout the 60's and 70's and that included white, at least till the end on the 60's.
 

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