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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Electrical Questions >> PIR's https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1233740915 Message started by Hoopsman on Feb 4^th, 2009, 9:48am

Title: PIR's
Post by Hoopsman on Feb 4^th, 2009, 9:48am

I have a large room in a house (6m X 3m) where there are 16 12V spotlights. The owner would like to have 2 PIR's fitted in the room, so that when the room is not being used the lights go out and when they walk into the room the lights come on. Is it possible to connect 2 PIR's to one switch? :-?

Title: Re: PIR's
Post by Zambezi on Feb 4^th, 2009, 11:43am

You get different types of PIRs, some can be connected to achieve what you want to do. Most need a neutral connected to the PIR so bear that in mind because quite often light switches don't have a neutral running to them.

Title: Re: PIR's
Post by LSpark on Feb 4^th, 2009, 9:43pm

You get what's called occupancy sensors, which are still PIR detectors but are specifically designed for the purpose that you require. All the ones I've fitted thus far require a neutral to operate though.

If no neutral is available AND you can't put one in, then perhaps a wireless type solution would suit you.

Title: Re: PIR's
Post by CWatters on Feb 5^th, 2009, 8:39am

Bear in mind the lights may go out if they sit still in the room.

Title: Re: PIR's
Post by londonman on Feb 5^th, 2009, 8:47am

CWatters wrote on Feb 5^th, 2009, 8:39am:

Bear in mind the lights may go out if they sit still in the room.

Made me smile! Visions of elderly ladies sat stationary around a table, oiuja board in front.

"Is there anybody there? Is there anybody there?"

Then the lights go out !!!! ;D

Title: Re: PIR's
Post by JerryD on Feb 5^th, 2009, 10:36pm

...........and as soon as one of them leaps up screaming, the lights come back on!

;D ;D