Good job they don't "have a guess" at 5/10/20 pair or more Blue instrument cables I've seen that done where a so called spark makes his own colour code up on a site, caused many a problem at commissioning time lol
 
I cannot believe that my apprentices tutor at college (Leeds college of Building) is actually teaching his students to use black as neutral with a blue sleeve and grey for switched wire or strapper in a 3 core cable 2-way circuit.

He is adamant he is right and my apprentice is worried he will fail his exam as I have told him I NEVER want to see a black wire used as a neutral in any of our work.....EVER!

There is no sense in this at all.
 
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Title
3 core - what colour do you use as a switch wire?
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Electrical Wiring, Theories and Regulations
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smity,
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gutterball,
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