Discuss Is this design exceptable for a Bathroom fan extractor. in the UK Electrical Forum area at ElectriciansForums.net
Hi! Thanks . Would you be able to post an a design pic of what you are saying i should follow. Thanks for your time and help.I assume the feed is coming in from the FCU at the top right? Is the fan an on/off or a timed one? If timed you will want to be sure the switched and permanent live run to the fan.
If this is a bathroom, presumably that's not a standard ceiling rose but a suitable bathroom light?
Whats confusing is the manufacturers demanding a FCU be fitted. Currantly the old fan runs on a light circuit with no FCU and islolator. I was going to just fit a 3 pole isolator at the pull cord. But if it requires a FCU i will need to redesign and incorporate the FCU. Thanks for your time and help.I assume the feed is coming in from the FCU at the top right? Is the fan an on/off or a timed one? If timed you will want to be sure the switched and permanent live run to the fan.
If this is a bathroom, presumably that's not a standard ceiling rose but a suitable bathroom light?
Is this what you mean i should follow.It's electrically OK, but it would be better to eliminate the junction box and take the feeds for the fan and the light back to the 3A switch/fuse.
There's no switch for the fan, so I take it that it's an automatic one with a humidistat?
You've labelled the pull cord "3 pole isolator". It's single pole and not an isolator with the wiring you show.. It's a switch
Currantly the fan runs on light circuit.Is this what you mean i should follow.
Great! Thanks for the advice.A 3pole fan isolator could be used in place of the junction box to enable all poles to be isolated (it does what says on the tin!
The intermediate 3 pole isolator 'junction' would not be needed.
As long as the 'fuse' also incorporates a DP switch (i.e. an ordinary switched fused connection unit), and is placed either inside the bathroom, (outside of the zones), or preferably, immediately outside of the bathroom door the triple pole isolator is not needed.Is this what you mean i should follow.
Yes this circuit is from thr mains power and is not powered by lighting circuit . Thanks .As long as the 'fuse' also incorporates a DP switch (i.e. an ordinary switched fused connection unit), and is placed either inside the bathroom, (outside of the zones), or preferably, immediately outside of the bathroom door the triple pole isolator is not needed.
This circuit does not actually have a light included.
How is this design?It's electrically OK, but it would be better to eliminate the junction box and take the feeds for the fan and the light back to the 3A switch/fuse.
There's no switch for the fan, so I take it that it's an automatic one with a humidistat?
You've labelled the pull cord "3 pole isolator". It's single pole and not an isolator with the wiring you show.. It's a switch
That's almost right. (I assume we're ignoring earth for the purposes of the diagram but that it will be there)How is this design?
Thanks thats great! Yes earthing was ommitted for diagram. Click mode gride switch. Need to look into that to.That's almost right. (I assume we're ignoring earth for the purposes of the diagram but that it will be there)
The 2 core to the pull cord will be permanent live to and switched live back, so the feed to the light will need to come from the junction box, not the pull cord, so you have switched live and neutral to it.
Many fans don't have the requirement for a 3A fuse, assuming they are running from a 6A MCB, so sometimes it's easier to pick the fan more carefully.
It is also possible to do it with existing lighting wiring, with a Click Mode grid switch, which can contain an isolator and a fuse - or even an isolator and 2 fuses if you need to fuse feed and switched feed separately (though that needs a two gang wide switch).
One of these along with one of these can fit into a single gang 3 grid front - so if you can tap into the wiring before it gets to the switch that covers things.Thanks thats great! Yes earthing was ommitted for diagram. Click mode gride switch. Need to look into that to.
Thanks for all your help . Much appreciated.One of these along with one of these can fit into a single gang 3 grid front - so if you can tap into the wiring before it gets to the switch that covers things.
If not, then you can get the isolator and 2 fused spurs into a two gang front
Just depends which is easier in the circumstances really - if there is RCD protection on a local socket circuit but not the lighting then the switched FCU method as you've drawn is a neat way to ensure the required RCD protection on the fan and bathroom light.
Is this fused spur RCD protected ok to install in bathroom safe zone? Morning.Thanks for all your help . Much appreciated.
Also is it safe to run surface mounted pvc trunking in zone 2 in the bathroom?Is this fused spur RCD protected ok to install in bathroom safe zone? Morning.
Any of the 'standard' fittings like this are regarded as IP20, which can't be used in zone 1 or 2 (so up to 60cm from the side of the bath). Outside of that they are ok for general use in a bathroom as long as they are not likely to be sprayed with water.Is this fused spur RCD protected ok to install in bathroom safe zone? Morning.
Reply to Is this design exceptable for a Bathroom fan extractor. in the UK Electrical Forum area at ElectriciansForums.net
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