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Or just get a couple of switches.Id just get another inline fan probably as cheap as relays and enclosures
Discuss Extractor fan relay for two independent light switches in the UK Electrical Forum area at ElectriciansForums.net
Or just get a couple of switches.Id just get another inline fan probably as cheap as relays and enclosures
I clicked on the wrong oneIs that even a dual input relay, I'm even more confused now. Looks like 1 AC input switching 2 different loads depending if the input is high or low
You can fit a relay in a backbox - and you'll most likely have one already for an isolation/maintenance switch. And it'll cost (if you pick sensibly) less than some of the switches people have been suggesting, and definitely less than an extra fan.Id just get another inline fan probably as cheap as relays and enclosures
TWO different circuits requires a different solution!from two different switched live lighting circuits.
The OP only says it's two different S/L circuits - I would read that as two different S/Ls, but probably still on the same MCB.TWO different circuits requires a different solution!
When you say double pole, did you mean, double pole in each switch for the bulb a jumper from each live to the fan and fan permanent neutral. With no relays ?.Thinking a 240V AC relay activated by two independent light switches could be used to switch power to a shared inline extractor fan. The fan serves two bathrooms, just needs to be activated from two different switched live lighting circuits.
I'm aware double pole light switches could be used in this scenario but the light switches didn't pass wife test.
Anyone know of a dual input relay I could use for this purpose?
Thanks
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It's not a good idea to drive an AC relay coil with DC.Oh yes, the relay will hum when on. It's possible to add a couple of diodes so the coil operates on DC, and it's inductance will smooth out the half wave and eliminate the hum.
You are probably correct as OP doesn't make it clear how its installed, that was my original thinking in my post #6 which incidentally a circuit I had used before and didn't experience any humming (or perhaps drowned out by sound of fan)The OP only says it's two different S/L circuits - I would read that as two different S/Ls,
That's it. But both lights must be on the same circuit.When you say double pole, did you mean, double pole in each switch for the bulb a jumper from each live to the fan and fan permanent neutral. With no relays ?.
It's quite common - some applications use a purpose designed DC coil, some use an AC coil and just feed it DC. Heatmiser do the latter in their UFH control/wiring centers.It's not a good idea to drive an AC relay coil with DC.
Reply to Extractor fan relay for two independent light switches in the UK Electrical Forum area at ElectriciansForums.net
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