Colour standard for 2 way switch

[JohnW2]

Cal me dense, but I can't think of a typical situation where three phase would consist of a blue conductor sleeved black.

How about red/yellow/blue over-sleeved with, say, brown/grey/black respectively ?

I'm not saying that it's likely to be done, but it would result in blue conductor having a black sleeve

Kind Regards, John

 

[sparkwright]

How about red/yellow/blue over-sleeved with, say, brown/grey/black respectively ?

I'm not saying that it's likely to be done, but it would result in blue conductor having a black sleeve

Kind Regards, John

Typically, an non-harmonised blue would be sleeved harmonised grey.

Harmonised black would typically go over the non-harmonised yellow.

 

[JohnW2]

Typically, an non-harmonised blue would be sleeved harmonised grey. ... Harmonised black would typically go over the non-harmonised yellow.

Maybe 'typically' but as far as I am aware there are no rules, and practices vary.

Lets face it, there are often discussions, revealing clear differences in views/practices, about which of black and grey should be used as a neutral, when required.

Kind Regards, John

 

[SUNRAY]

Cal me dense, but I can't think of a typical situation where three phase would consist of a blue conductor sleeved black.

Depends what colour the other wires are.
if it was brown, grey, blue (as it happens correct colurs for DC... unless changed in recent editions) &E

 

[SUNRAY]

Maybe 'typically' but as far as I am aware there are no rules, and practices vary.

Lets face it, there are often discussions, revealing clear differences in views/practices, about which of black and grey should be used as a neutral, when required.

Kind Regards, John

There are, I jumped in with keeping it black until I happend to work on an old circuit which had been extended with harmonised cable and suddenly I found a very good reason as earthy yellow became black and neutrally blue became grey. it all dropped neatly into place.