Help please...to fit bathroom in-duct fan located in attic.
I have read wiring diagram on site related to fan operation via pull cord switch but a little unsure.
Am I right doing the following ? The switched positive + neutral connect to positive + negative output side of junction box. Permanent live connect to supply side postive on junction box. Connection between junction box and fan via three pole isolator switch ?
We don’t have positive and negative with an AC supply we have phase or where single phase “line” and “neutral” normally the fan is switched on with the light I do not understand where or why you have pull cord switch? The whole reason for a three pole switch is there are normally to line feeds one switched and one always line and a timer within the fan makes to continue to run for 15 mins after turned off. This diagram http://www.ericpalmer.fsnet.co.uk/Images5/LIGHTS.JPG will give you some idea I hope.
Pull switch referred to is located in the bathroom to operate lights. I had intended using the junction box serving this switch to operate the fan when lights are switched and put a 3 pole switch between the junction box and the fan itself.
I can't quite work out what the junction box has. As standard the ceiling rose also acts as a junction box. Once one leaves the standard method it is hard to work out what you have. The diagram I directed you to is part of http://www.ericpalmer.fsnet.co.uk/Lighting.html web page maybe whole page will be of more help.
Not all fans need connection to lights some have a humidity control so only a two pole isolator will be required.
I hope that helps Eric
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