Wiring bathroom extractor fan from lighting circuit

dont forget the fan isolator!

 

Aye three core and earth plus a TP Fan Isolator Switch made especially for isolating the fan whilst maintenance is being carried out on the unit....

 

do I need to use 3 core and earth?


Why do you think you need 3c + earth?

 

Is it Part P notifiable?.... don't ask me I dont give a hoot.....:^O

 

You need three core, the perm live allows the fan to run on after the light has been turned off.
The isolator as said is to allow maint on the fan, so the live, switched live and neutral are all isolated from the fan

 

By asking the question it gives an idea of your depth of knowledge.

If you only want the fan to run when the light is on, then 2 core is adequate, simply link is fan.

 

bloke at work suggested 3 core and earth being part
of the solution - wanted to run it past the experts.

And if he suggested T + E what would have been the modus operandi behind his thinking....with regards to the CPC....

 

By asking the question it gives an idea of your depth
of knowledge.

If you only want the fan to run when the light is on,
then 2 core is adequate, simply link is fan.

Why the link. Fan will come on with the light, go off with the light, no run on

 

Sorry 2c+earth

 

Why the link. Fan will come on with the light, go off
with the light, no run on


fan is double insulated and has live, switched live and neutral connections

???????

 

forgot to mention the fan has overrun facility, which
i would like to utilise - if that makes a difference?

Which is why I asked if the chap had suggested T + E what was he proposing to do with the CPC?....

 

Why the link. Fan will come on with the light, go
off
with the light, no run on


fan is double insulated and has live, switched live
and neutral connections

???????


OK education time.
In general use the fan will run without the perm live ie no link required. The switch live will put the fan ON and OFF without a timer function. The link to the permanent live which would normally keep the fan running would be dead once the light was switched off so it'll be as much use as a chocolate fire guard.
Double insulation means chuff all for a control circuit.

Clear as mud now

 

Which is why I asked if the chap had suggested T + E
what was he proposing to do with the CPC?....

Had just that the other week, guy even put the test certs into LABC. They came out and bounced the job - surprise surprise

 

Need 3 core from the jb.
Perm live, the live that goes to the light fitting itself ie the live from the switch, & neutral. Then 3 core to the fan