Missing neutral for the Bathroom Fan Installation

[Papillion]

Hi,
I am newly qualified and would very much appreciate some advice on this. I few days ago I've purchased one of those low noise bathroom extractor fans with a timer and humidity sensor and run a three core cable from it to the loft which I was planning to connect to the 3 pole isolator.

Once in the loft, on closer inspection by removing part of the floor boards, the wiring for the bathroom light has a conductor from the pull cord switch with the (a)red wire connected to the live (brown) of the light and (b)black wire connected together with the red coming from the next light and both connected to the neutral (blue) of the light.

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There doesn't seem to be a neutral wire coming from the next light and the extractor fan needs a permanent live, neutral and switched live to connect. Any advice on how to wire this would be greatly appreciated.

 

[accordfire]

if you have ever done intermediate wiring you would know about wiring colours blue and yellow are used there respectively for strapping and switching

Yes, James, I've done a little, in the last 25 years or so. Blue and yellow used to be the colours, but that stopped a few years back when CENCELC harmonisation came upon us. Blue was replaced by Black, and yellow by Grey. Solid green hasn't been used as a CPC colour since, ISTR the 70's.

It was a question, was all - no need to be so defensive.....

 

[james hanley]

apologies mate i didn t realise i was being so defensive.

 

[denpicardo]

The most common way to install a new exhaust fan is to put it in place of an existing ceiling light, controlling it from the light's wall switch.If you are really ready to take some step by step instructions,I can give you a little more time tonight and can talk you through this.Since I have some time invested in your project,I would love to see it resolved too.

 

[malcolmsanford]

Um...did I miss something in the colour coding somewhere?

Where do you get four core mains cable with a yellow core and a green core?

If you mean four core flex, it's not suitable for a lighting final anyway, and the colours would be Brown, Black, Grey, and Green/Yellow striped....

If you mean 3 Core and Earth, well, that's pretty well Brown Black Grey, and bare CPC sheathed green/yellow striped.

Bit puzzled as to where you get the colours from....

Why not suitable as long as you apply regulation 521.9.1

 

[telectrix]

Yes, James, I've done a little, in the last 25 years or so. Blue and yellow used to be the colours, but that stopped a few years back when CENCELC harmonisation came upon us. Blue was replaced by Black, and yellow by Grey. Solid green hasn't been used as a CPC colour since, ISTR the 70's.

It was a question, was all - no need to be so defensive.....

surely it was yellow replaced by black and blue by grey, or is it me getting confused now

 

[JUD]

surely it was yellow replaced by black and blue by grey, or is it me getting confused now

That's more like it

 

[accordfire]

surely it was yellow replaced by black and blue by grey, or is it me getting confused now

That's what I like about this place - nobody is afraid to point out an idiot when they see one lol!

That was me concentrating very hard on the theory that black would no longer be associated with neutral, and I wrote the very opposite! Just proof that I really am a moron!

For the record, - Red became Brown, Blue became GREY, and Yellow became BLACK......

Now flagellating myself repeatedly with a harmonised piece of 3&E!

 

[james hanley]

gees a job mate i can dae that!! lol