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Hi, I want to wire in a timer switch to a bathroom extractor fan. The extractor fan is currently wired to the light switch or more specifically line on the ceiling rose terminal.
I would like to keep the fan coming on with the lights and have an additional timer switch on the wall next to the light switch that a person can press after a shower or bath and extraction will work for 15mins more with the light being able to be switched off. Currently I need to go back and manually turn the light off which is a pain.
The fan did not come with a timer and with a blank page to work from I prefer the idea of it not being an automatic timer that way if someone is using the bathroom for a minute or so the fan doesn't need to come on for 15 minutes.
I can't find any products with a quickly adjustable timer dial to mount on the wall and don't think that's the best solution anyway. Perhaps a humidity sensor would be the most hassle free however I've decided to go with the Elkay 3 wire master timer pushbutton switch and will set it for 15mins.
Can anyone advise if its acceptable to use a relay in a lighting circuit, best practise for mounting and if the below picture would work?
I'd have one switched live going to com 1 on first relay and the other switched live from timer going to com 1on second relay. Just imagine the light in the picture is swapped for the extractor fan.
The only thing that concerns me is if the light is on and someone presses the timer then both normally open contacts would come on and would that cause any problems? Would electricity travel from 1 relay to the other and towards the opposing switch? I assume it would but can this cause overheating or likewise.
The other thing is all the live feeds will be coming from the lighting circuit but does this then become two separate circuits or is it still classed as the same circuit?
I want this to work so any suggestions would be good and it needs to be this setup unless there is a different electrical component that can be used instead of a relay?
Thanks.
I would like to keep the fan coming on with the lights and have an additional timer switch on the wall next to the light switch that a person can press after a shower or bath and extraction will work for 15mins more with the light being able to be switched off. Currently I need to go back and manually turn the light off which is a pain.
The fan did not come with a timer and with a blank page to work from I prefer the idea of it not being an automatic timer that way if someone is using the bathroom for a minute or so the fan doesn't need to come on for 15 minutes.
I can't find any products with a quickly adjustable timer dial to mount on the wall and don't think that's the best solution anyway. Perhaps a humidity sensor would be the most hassle free however I've decided to go with the Elkay 3 wire master timer pushbutton switch and will set it for 15mins.
Can anyone advise if its acceptable to use a relay in a lighting circuit, best practise for mounting and if the below picture would work?
I'd have one switched live going to com 1 on first relay and the other switched live from timer going to com 1on second relay. Just imagine the light in the picture is swapped for the extractor fan.
The only thing that concerns me is if the light is on and someone presses the timer then both normally open contacts would come on and would that cause any problems? Would electricity travel from 1 relay to the other and towards the opposing switch? I assume it would but can this cause overheating or likewise.
The other thing is all the live feeds will be coming from the lighting circuit but does this then become two separate circuits or is it still classed as the same circuit?
I want this to work so any suggestions would be good and it needs to be this setup unless there is a different electrical component that can be used instead of a relay?
Thanks.
- TL;DR
- Are relays acceptable in UK domestic lighting circuit.