insulation resistance

[steve.t.]

carried out an IR test on a lighting circuit, the E to N was 299, E to L was 299 but N to L was 0.03, only had time to complete that test while doing other work, going back tomorrow. Any suggestions on what it could be would be apreciated. The 1.5m t&e looked in god condition in attic.

 

[Bradzz]

looks like you are going to have to brake down the lighting circuit, and test each section, P/N fault, might of striped back section when pulling through joist?
All lamps out, any aerial boosters connected to lighting, does the loft light have a neon
switch.
Does the down stairs lighting have a Separate Neutral, to up stairs?

 

[Goody]

FCU with neon, transfomer (for low voltage spotlights), choke (for tube lights) or extractor fan with timer?

Best of luck.

 

[steve.t.]

no neon switches or transformers, a few junction boxes up there that i checked for loose connections

 

[Electricalserv]

Got to be something on them circuits in my opinion mate. Have you tried L/N-E?

 

[steve.t.]

its a bungalow, just 1 circuit

 

[tony mc]

As above any outside lights PIR my money is on something is still connected neon bulb etc.

 

[steve.t.]

no, didnt try L/N and E

 

[Electricalserv]

no, didnt try L/N and E

Give it a go...

 

[tony mc]

On your previous results L N /E will be clear as there will be no PD.

 

[i=p/u]

ariel booster

 

[Sparky Ninja]

L/N - E would be covered with the L - E & N - E test.

It looks like you still have something in the circuit. You need to find the midway point, split the circuit and chase down the problem.

 

[i=p/u]

can you do a test where you measure resistance and then convert into meters and tells you where fault is, im sure ive read this process before in a book

 

[Electricalserv]

The best bet is as described. Halfing the circuit and going either left to right (whichever way the fault goes) and halfing again until the fault is identified. There is definately asomething still on that circuit. I said to do the L/N-E as this test would almost certainly identify if there was something still on the circuit giving bad readings!

 

[i=p/u]

L/N-E would bypass any neons yeah? if you do find isit acceptable to just open the circuit?? ie. switch