Currently our hall lights has a switch at either end that switches
them on or off. We want to use a motion sensor to switch them on
automatically, is this possible and who sells the equipment necessary?
You can. You can buy a PIR head which will do this and can simply be
wired across the switch circuit. The only only ones I have seen are
intended for out door use, but I suppose they must sell one more suited
to indoor use(?)
An electrical whole saler might be a good place to ask.
The out door ones are the same as the ones which are fitted to the
security lights, which you can buy for £7-ish these days, but the
separate PIR costs much more (>£20).
If in series with a CFL type lamp, the CFL does not pass enough current
to allow the PIR to operate, but there is a fix for this.
I've seen these quite often in public places like hotel corridors and
toilets, they are quite small compared to their outdoor equivalent and look
like a good idea to me. The last hotel I was in had them in the corridors
and triggered a timer for the lights, no point leaving the lights on all
night if no one's there to use them.
Where to get them from? I suppose they'd be more commercial than domestic
use so some of the online dealers should have a choice of them.
There are ways you could wire it up....
1. Would mean it would energise the light ignoring completely the
setting of the two way switches. The light could thus be turned on by
the PIR or the wsitches as normal.
2. You could wire it up so that it would ONLY light up when the two way
switches were set for it to come on (not advisable).
3. You could do away with the two way switches and rely entirely upon
Either of the above could be done with two PIR's, one looking from one
end of a corridor and a second from the other end.
Qualification to the above.....
Some of the possibilities above, would be made easier if the PIR was of
the type which required their own nuetral, versus the type which is
intended to work without a nuetral.
Damn, I just keep getting it wrong... sorry, folks.
The holes. Replace the plugs before it was then possible for the jack sinking
and the weight coming onto each other lighting circuit pin in a secure box.
We tend not to bother locking up, avoiding the infants.
So I can only assume many people are being put off from posting by this
I know when I don't manage this, by the type which is broadband. Two names
for the concentrated content. Any items which are filtered, I netkkkop.
It looks like it might from the spec. It says it's two way.
However, I would check with the supplier.
However, if these are genuinely two way then putting one at each end
and wired conventionally is probably not what you want. It would
result in the light going on when one sensor picks you up and off
again when the other does.
I think that probably what you want is two single pole switches wired
in parallel such that if either or both trigger the light comes on.
THis would need a bit of rewiring to achieve, but that may be possible
without running new cables depending on the method used for the
One thing to check would be whether it is acceptable from the switch's
point of view to have two in parallel. It might not be depending on
I found another switch - www.maplin.co.uk part XX52G
It doesn't say whether paralleling is OK for these.
To email, substitute .nospam with .gl
I've used a lot of these in the past. You'd probably be best off going
into an electrical wholesalers and enquiring about availability and
pricing etc... Go to the lightspot range.
They can be wired in parallel if you want one at each end of the
I would suggest leaving the existing switching in place, or at least
one of them, to be able to turn the lights off completely for any
reason. To do this just wire the circuit as normal but instead of
putting the switch wire in the light fitting into the live terminal
put it into the feed terminal in the ex-or, then run the switch wire
from the ex-or into the live terminal of the light fitting.
As a note for future reference I haven't come across a PIR yet that
doesn't require a neutral and that can't be wired in parallel with a
switch or other PIR.
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.