"Andrew Chesters" wrote in message
...
PhilÅ wrote:
"Fred" wrote in message
...

"PhilÅ" wrote in message
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wrote in message

...

"PhilÅ" wrote:

Hello

I have just installed a bathroom fan which is on a timer...

Problem is...

fixed 240 V is from a 3A spur of the a socket ring on the RCB.

the light feed is not on the RCB.

So when connected up the neutrals are now common and the RCB is
tripping..

I take it I now have to connect the lighting ring to the RCB??


You should have taken all the feeds to the bathroom fan from a single
circuit, I'm pretty sure your wiring contravenes the IEE regs and, as
you've discovered, it doesn't work either!

--
Chris Green

Chris

If I take them from the mains ring (common) then this contravenes IEE is
dangerous, as the lighting ring could be switched off and the light
live,

so

I am to take it all from the lighting ring...



I don't want to sound offensive I would suggest you get professional help
in.

You should never take a live feed of one circuit and a effectively a
neutral
of another. If your case there is no longer a neutral current so
there'll
immediately be an imbalance of current in the live and neutral flowing
through the RCD. It will trip as soon as you put any load on any
circuit.




fairy muff, I will forget the timer option, and just connect the fan up
to the lighting thingy..

Cheers


Can you run a 3 core and earth to the fan? One core switched with the
bulb, an other to provide power for the timed run with the third as
neutral. This is how they are intended to work, but with the changes to
bathroom regs, I'm not sure what would be required any more.

Andrew

I think I might do that??.

Have to find suitable cable.

The fan does not have any place for a earth??.