hi all....extractor fan help please

[Screwi]

You still should have an 3P isolator switch

 

[magico]

i`ve done a search on web and can`t find one.....is it a actuall switch?

 

[breezer]

yes it is, but you obviously dont search too well, try screwfix or tlc

 

[magico]

found the switches on screwfix...crabtree 3 pole isolating switch for £7.21 or a select 10a fan isolator switch 3 pole for £1.34........whats the difference? would a 16mm back box be ok and do you think the xpelair standard 4" fan would be ok?

 

[felix]

if so can any 1 recommend one which works on a timed basis

Sorry but I took it from this that you wanted a timer fan, ie one that runs on for a preset time after you turn the light off. If that isn't what you meant and you don't want this feature then you (a) don't need three core cable and (b) don't need a three pole isolator. Standard flat twin and earth and a double pole switch will suffice.

PS: You can still use a timer fan in simple mode. Connect its permanent live and switched live terminals together.

 

[magico]

not being an electrician felix...if i need to do any electrical repairs i just turn off the lot mate.....all i wanted was when i turned the bathroom light on the fan to come on too.as there isn`t a window in there yet(no light source)whenever its used the light is on. SO do i need a switch for fan?or will it not just work off the origional light switch?

 

[felix]

SO do i need a switch for fan?or will it not just work off the origional light switch?

Elementary circuit theory says it will work if you simply connect your fan in parallel with the light bulb. Whether or not you need an isolator as well depends upon wiring regulations. That's not my area of expertise but I'm sure somebody out there will tell you (and me) before long. Watch this space.

 

[magico]

just got the plans out and this is what it ask for."Light Operated Humidstat Fan To Open To Air Above"....i take it in simple terms that i need a fan with a humidistat ceiling mounted with exhaust on roof yeah?....would this equipment do the job

http://www.screwfix.com/app/sfd/cat/pro.jsp?ts=21575&id=15722
http://www.screwfix.com/app/sfd/cat/pro.jsp?ts=22028&id=13730
http://www.screwfix.com/app/sfd/cat/pro.jsp?id=44952&ts=22153
http://www.screwfix.com/app/sfd/cat/pro.jsp?ts=22325&id=14789
and some 3 core and earth?

 

[felix]

Well you found the three pole fan isolating switch at last!

Now for the fan itself. From your very first post I took it that you wanted the fan actually inside the shower cubicle amongst all the steam and soap suds. You didn't say anything about a humidistat fan either. You'll have to get a fan which quite specifically says it's for shower CUBICLE use. They do exist. Remember that it might be subjected to a direct spray of water when somebody tries to rinse under their ears.