360° White Microwave Sensor Surface Mount fitting

mani222 · Post by **mani222** » Thu Apr 25, 2024 9:16 pm

Hi guy's I'm looking to fit this light sensor, there are four terminals on the sensor

mani222 · Post by **mani222** » Thu Apr 25, 2024 9:18 pm

But only two wires in my light switch, blue going to L1 and brown com

mani222 · Post by **mani222** » Thu Apr 25, 2024 9:20 pm

Do I need to add a 4 core cable going from light to sensor?

mani222 · Post by **mani222** » Thu Apr 25, 2024 9:20 pm

Someone-Else · Post by **Someone-Else** » Thu Apr 25, 2024 9:38 pm

If you did install a 4 core, where would the other two go?

In short, you have a normal switch, 2 wires. One is permanent live, the other goes live when you operate the switch (Pull the string) this one is called switched live.

Your movement sensor requires Live, Neutral and switched live. You would have to do some re wiring, or put the switch back.

Neelix · Post by **Neelix** » Thu Apr 25, 2024 9:39 pm

That sensor needs a neutral, which you don’t have at your switch

mani222 · Post by **mani222** » Thu Apr 25, 2024 9:56 pm

Thanks both, can I pull natural from the light fixture?

ericmark · Post by **ericmark** » Thu Apr 25, 2024 10:09 pm

I am sure you could pull in another cable, however I would look at putting the PIR next to light which has got line and neutral wires, and leave old switch where it is.

Not sure why you want a PIR, there are some advertised to work without a neutral.

mani222 · Post by **mani222** » Thu Apr 25, 2024 10:27 pm

OK Which of the four terminals should I use, say at the switch would I connect to L and N on sensor and new neutral to N-Load on sensor?