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PostPosted: Mon Oct 02, 2017 8:22 pm 
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Hi,
I'm replacing a standard bathroom fan on a pull switch with a timer fan which is activated from the light switch. The old pull switch isn't now needed and neither is the live cable that feeds that switch. How can I find where the other end of that live feed goes to so that I can remove the cable that isn't now needed? Is it just a case of trial and error with a multitester?

Any advice would be greatly appreciated.

Thanks


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PostPosted: Mon Oct 02, 2017 8:56 pm 
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possibly the ceiling rose :dunno:
is it dead with the lighting supply turned off ??

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PostPosted: Mon Oct 02, 2017 9:03 pm 
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Seems to be from a different room. Still live when lighting supply off.


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PostPosted: Mon Oct 02, 2017 10:11 pm 
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dont forget upstairs is a possibility from a socket if on the ground floor

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PostPosted: Mon Oct 02, 2017 10:49 pm 
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Mountainman wrote:
Hi,
I'm replacing a standard bathroom fan on a pull switch with a timer fan which is activated from the light switch. The old pull switch isn't now needed and neither is the live cable that feeds that switch. How can I find where the other end of that live feed goes to so that I can remove the cable that isn't now needed? Is it just a case of trial and error with a multitester?


How will you power the fan if you remove the cable?

The easiest way (in theory) to find the other end of a cable is to follow it. I know its easier said than done, but short of using a cable tracer anything else is just a guess. You could always leave the switch there for when the timer on the fan fails (as they often do)

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PostPosted: Tue Oct 03, 2017 6:30 am 
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Thanks both. The new fan will be powered from the light switch.

Guess it's just going to take a bit of time to work it out .


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PostPosted: Tue Oct 03, 2017 7:16 am 
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Mountainman wrote:
Thanks both. The new fan will be powered from the light switch.



You can't power a fan from a light switch*

A light switch has two wires (Not counting earth) One wire is live, the other wire is switched live (It goes live when the switch is operated, hence its name)

Normally when installing a fan with timer over run a 3 core+ earth cable is taken from the light to the fan via a fan isolator switch.
One core is permanent live
One core is permanent neutral
One core is switched live



* Unless the supply comes down to the switch and back out, in which case it will be 2 cables, it is done this way, but not often.

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PostPosted: Tue Oct 03, 2017 9:32 am 
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Yep. Understood that. Just had planned to do it a different way I.e. Taking live from ceiling rose and switched live from light switch. But actually your approach works better. Planning to use twin and earth plus a double insulated single core rather than 3 core.

Thanks for your help.


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PostPosted: Tue Oct 03, 2017 9:35 am 
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Slight complication is the fan requires protection of live and switched live via a fuse, but should be able to work that in.


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