Wiring colours in uk

[Jazz carne]

I am Uk based: I have brown, blue and black wire on the extractor fan. From the power source I have brown, grey and black wires... please how I connect them to the extractor. All help be great.. thank you

 

[westward10]

The question is, which should they use?

Grey - that is another phase colour!

Now if only there were a standards organisation that could specify this...

Grey is a line colour unless it is identified otherwise. Neutral can any of the colours under the sun provided it is sleeved/marked with blue.

 

[davesparks]

The question is, which should they use?

Grey - that is another phase colour!

Now if only there were a standards organisation that could specify this...

Traditionally core numbers 1 and 2 were used for lives and core number 3 was always used for neutral in this kind of arrangement.
1 being brown (red)
2 being black (yellow)
3 being grey (blue)

So the blue was always used as neutral therefore the logical choice is grey for neutral.

 

[pc1966]

Traditionally core numbers 1 and 2 were used for lives and core number 3 was always used for neutral in this kind of arrangement.
1 being brown (red)
2 being black (yellow)
3 being grey (blue)

So the blue was always used as neutral therefore the logical choice is grey for neutral.

Good point, as it puts the earth between the live pair and the neutral which would lead to better RCD protection against insulation breakdown.

Does anyone know if this is documented in IET docs or in training, etc?

 

[davesparks]

Good point, as it puts the earth between the live pair and the neutral which would lead to better RCD protection against insulation breakdown.

Does anyone know if this is documented in IET docs or in training, etc?

That sounds like nonsense to me, trying to create a technical reason for something where there isn't one. That would only apply to T&E anyway.

No it isn't documented in any IET documents as there is no formal requirement either way, as long as cables are properly marked it will comply.