PIR AND SWITCH Fault

[bjl]

Hi
One of our room lights got reported flashing intermittently and then would not work. I have checked at PIR and only 150v there is 240v at switch at com and L1 when switched. Even though its only 1 way switch. 2 cables coming in grey- com, L1 -brown, L2- black
At PIR grey - neut, Black and brown - live in and out
Replaced PIR and switch and the lights still not working
Thanks

 

[DefyG]

You've replace the switch and pir but not the obvious one - the lamp?

 

[bjl]

3 lights in room none work

 

[westward10]

Did you try and bypass the PIR instead of just replacing it?

 

[Brother Blue]

What points did you measure those voltages between and what type of meter did you use to measure them?

 

[bjl]

Tried linking out pir which made no difference
Used multimeter between neutral and live in on pir and between earth and switch terminals

 

[Brother Blue]

If the multimeter is reading a true voltage then it could be a fault with the neutral

 

[bjl]

Where from the pir to the first light how would I check ?

 

[westward10]

If linking out the PIR made no difference it probably didn't need replacing. You need to do some continuity tests.

 

[DefyG]

Even though its only 1 way switch. 2 cables coming in grey- com, L1 -brown, L2- black
At PIR grey - neut, Black and brown - live in and out

2 cables coming in but grey to com, brown to L1 and black to L2 implies just one cable a 3core & cpc! what is the other cable doing?
Are any of them sleeved with brown or blue sleeving? Grey at common of switch implies a live conductor, grey at PIR you say is Neutral conductor! Dangerous situation if not identified!

Perhaps some photos?

 

[bjl]

Sorted bad connections thanks