adding a pir detector

[gabrielh]

Hi, can anyone help please. I have a pir in a shower block for the lights, there is a blind spot and I need to fit an extra pir to cover. I've got two neutral wires attached to the existing pir into one connection and two lives in seperate conections and a seperate earth.

Can anyone advise how to cut into this and extend so that the lights will work if either pir detects.

Thanks

 

[Steve]

With identical wiring. IE you need a 3 core and earth between the two PIRs and replicate the connections.

 

[bongos]

Hi, can anyone help please. I have a pir in a shower block for the lights, there is a blind spot and I need to fit an extra pir to cover. I've got two neutral wires attached to the existing pir into one connection and two lives in seperate conections and a seperate earth.

Can anyone advise how to cut into this and extend so that the lights will work if either pir detects.

Never usued a PIR but i'm guessing the neutral is looped in at the fitting, where you will also have a live feed supplying it and a switched live onto the light.

EDIT: As Steve suggests.

 

[Steve]

I expect most PIRs have neutral connection, as most use a pair of contacts, rather than solid state circuitry (they could be used to switch fluorescent loads which wouldnt like electronic control etc)

 

[gabrielh]

Thanks very much, seems simple enough

 

[Taylortwocities]

You can do it like this

 

[Steve]

You could loop in and out of as many PIRs and lights as you wish in theory with that design TTC. The only constraint is the individual PIR rating - each PIR must be rated for the entire load connected.

 

[Taylortwocities]

I know.

The diagram was (as they say) one I prepared earlier!

 

[ban-all-sheds]

And what's great is that it needs no connection to a supply!

Think of the money savings!!

 

[Taylortwocities]

Ahh, but my diagram is in response to the OP's requirement to ADD a PIR to an existing one. I'm assuming that the existing one already has a supply.........

I have another diagram that has a supply, and an over-ride switch on it. But I didn't want to confuse things more than they probably will be as they usually are around here....

 

[ban-all-sheds]