Hi there
My company are about to have the works fix wire tested.
They say they will need to test the light circuits as the system as never been tested.
This can be done from the fuse board and not at the lights.
The lights are controled by a 2 wire 12vdc system and use hf ballists.
How will they test the insulation? without removing the lamps and not shorting out the fittings
Or is test not requred.
regards
wayne.

Insulation tests can be done by shorting L & N and just testing between that and earth (not an ideal test, but acceptable, especially in an existing installation).

There's more to I & T than just insulation testing though - presuming that the lights are mains powered (and it's just the control side that's 12V) then I'd expect a loop test - or earth continuity at the least - done at the lights (at least at the last one on each circuit). (Unless then entire system is class II, which is probably unlikely).

- Andy.

Hi , good question.

I am assuming that it is 0-10v controlling the ballasts.

I installed 22 fluorescent fittings using 0-10v a short while ago and it did cross my mind how I would test these if they were existing fittings.

As it was I tested the cabling before I connected the fittings.

I was not sure what would happen if I left the ballasts connected with the 0-10v cables.

Would the ballasts get damaged ? .

Regards

Hi there
Ive asked this question ,as ive had some electricains to quote for a full test and they say they can carry out the tests without having to go up to the fittings?
I find this to be strange as when i sat 2391 you could not test loop at the db it had to be done at the end of line fitting.
Have i missed some new way of testing ,its been along time since my corse.
regards
wayne

just go round and r2 the fittings via a wander lead connected to the db

If this is for a PIR I could imagine them dropping kicking a lot of the tests into the "Extent & Limitations" box.