Fault finding (Electrical)

MadMacs · 15 May 2007 at 20:24

Hey, wounder if someone can help me.
On friday I got my "fault finding practical assessment" (2330 level 3)

Anyways on the continuity of a radial and lighting circuit, why do we only test R1+R2 and not the neutral?

How would we be able to tell if there was an open neutral?

I realise this is probably not the best place to ask but can't be bothered to register on an electrical forum just to ask that!

Thanks

shimy182 · 15 May 2007 at 21:30

i think its because neutral will be tested as a result of testing R1 and R2, i dont think i got the question...

MadMacs · 15 May 2007 at 22:20

shimy182 said:
i think its because neutral will be tested as a result of testing R1 and R2, i dont think i got the question...

Lol, not to worry registered on an electrical forum and got the answer!

r1= Live
r2 = earth

But apparently you do test neutral when fault finding

Adam_151 · 15 May 2007 at 22:41

I've never worked out why we never test R1+Rn as part of normal testing either, it would be easy enough to do and would pick up neutrals that are loose etc that could lead to overheating, maybe its not a significant enough problem to warrent it.

Anyway r1+r2 is significant because you are proving earth continutity and polarity (and you can add it to Ze if you really have to and get Zs, but better to just use it as an indication that the earth is complete and the Zs tester can be fetched)

MadMacs · 16 May 2007 at 17:52

For the exam we will just be doing continuity, insulation resistance, polarity and a visual.

Got a ring, radial and lighting to test.

Gonna go into college tomorrow for a bit of practice.
I'd be ok if I was just doing testing on my own but when there is an assessor watching you, Puts you under pressure a bit.