Change light switch to a room pir

[djkev60]

Evening everyone
Hopefully someone can help
Trying to replace a light switch with a room pir. Stuck on the wiring
Which terminals should I remove and connect to the PIR please.
Thanks in advance
I have attached pics to help

 

[ericmark]

I look at the colours of wires connected to termials marked N and L, with this in mind I would want to test. There is nothing to say red is line or black is neutral, so all may be OK, but I would want to test.

 

[JohnD]

Is the old one a double switch? Is it a dimmer? Is it a 2-way switch? Are you in UK? Show us pics of front and back.

Light switches mostly often have L and SL and do not need N

Colours are probably meaningless.

Have you got the instructions for the new one?

 

[RandomGrinch]

Looks like a double pole switch to me...

Are you in UK?

Well, the switch is marked as made in the UK!

Possibly two lights controlled by the same switch, but could be separated?

 

[JohnD]

Looks like a double pole switch to me...

Oh yes

Unusual for a light switch.

 

[sparkwright]

Looks like a double pole switch to me...

Indeed, and wired up incorrectly too - if polarity is to be believed.

 

[RandomGrinch]

Indeed, and wired up incorrectly too - if polarity is to be believed.

I wouldn't say 'Incorrectly' exactly - it looks to me as if a live and switched live pair are using the L poles and another L and SL are using the N poles.
that's why I suspect two lights/lighting circuits are being controlled by the same switch, or possibly it's an interesting way of separating an extractor fan from the lighting circuit?

Some clarification from the OP could be helpful!

 

[djkev60]

AHH I think you hit the nail on the head.
It also operates a extractor.
It's only a single switch to a bathroom
I'm going to test the cables to help explain what's live etc so hopefully you can help. I was just expecting two wires but then found this which confused me.

 

[JohnD]

Is the old one a double switch? Is it a dimmer? Is it a 2-way switch? Are you in UK? Show us pics of front and back.

Light switches mostly often have L and SL and do not need N

Colours are probably meaningless.

Have you got the instructions for the new one?

Photos?

 

[djkev60]

So N2 is always live n1 is only live when switched on. Nothing else shows a positive
Does this help at all guys

 

[JohnD]

So N2 is always live n1 is only live when switched on. Nothing else shows a positive
Does this help at all guys

What sort of tester did you use?

There is no "positive" on AC mains.