fitting a PIR sensor (4 wires)

[gwynnjones]

I recently purchased a LAP PIR sensor

LAP Indoor & Outdoor White PIR Recessed Standalone Sensor 360° - Screwfix

Order online at Screwfix.com. Polycarbonate. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

I presently have 4 wires where the old pull cord was (picture attached). Could someone please explain where the neutral wires are? The wiring is about 30 years old.

 

[westward10]

There doesn't appear to be any.
You can't just connect it with those Wagos unenclosed in the ceiling space.

 

[telectrix]

1st thought is that it's either used the cpc,s as neutral or is wired L-E. best get a spark to look at it (or an undertaker. sparks are cheaper).

 

[SJD]

The wiring looks like single & earth, often used e.g. in the 1960's, instead of twin & earth. Since there was no need for N at the switch, it didn't need to be taken there. Likely there will be single sheathed N cables at the light fittings. (This wiring looks to be more than 30 years old to me.)

As westward mentions, the connections need to be enclosed - I'm guessing the connections were in the now-removed pull cord switch. Either they need to go back into whatever switch is fitted there, or be enclosed e.g. in a Wagobox.

If you need a N for a PIR, you'll need to run a new cable that includes it, e.g. from the light fitting.

 

[gwynnjones]

Thank you everyone for your feedback. I have placed the cables into a Wagobox and I will call an electrician.