Insulation resistance Live to Earth on lighting circuit dead short

[Lilyrose08]

Hi all, Tested a lighting circuit recently and got live to earth dead short and neutral to earth dead short on insulation resistance all loads were still connected there was a fluorescent fitting on the circuit and signs of green goo in switches and ceiling roses and the MCB was not tripping. Do you think a load would give me a dead short between live and earth like the fluorescent fitting ?

 

[Deleted member 9648]

Probably a N-E fault but if there's a load it'll read through it and you'll also get L-E reading

 

[telectrix]

further investigation required. dis circuit completely from CU and start again. with loads in circuit a L-E will affect N-E asnd vice versa.

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dammn it, wirepuller . faster fingers. LOL.:63:

 

[Lilyrose08]

They want me to rewire the circuit anyway so I had to leave the light on the non Rcd side to re-energise it but they don't want it re-wired until may - so I told them I cant sign it off until its re-wired. What would you do in this situation ?

 

[Deleted member 9648]

They want me to rewire the circuit anyway so I had to leave the light on the non Rcd side to re-energise it but they don't want it re-wired until may - so I told them I cant sign it off until its re-wired. What would you do in this situation ?

Rarely takes long to trace a N-E on a lighting circuit.....but it's probably been there for years anyway.....your call.

 

[chrish_1977]

Just write a letter detailing what you found and that they told you to leave it until the rewire was carried out

 

[trev]

They want me to rewire the circuit anyway so I had to leave the light on the non Rcd side to re-energise it but they don't want it re-wired until may - so I told them I cant sign it off until its re-wired. What would you do in this situation ?

Why pay you to rewire the circuit, why not pay you to find the fault? It'll probably be cheaper, I'm surprised you didn't suggest that mate

 

[Lilyrose08]

I did offer that but they want the whole house re-wired as they have got green goo dripping from a lot of accessories and the lighting is lacking cpc's. I think ill send them a danger notice to cover my arse. Just a quick question how dangerous is a neutral to earth fault ?????

 

[Des 56]

Lillyrose I will presume you are not that experienced,at either testing or fault finding,why not try and find the fault on a pay as you succeed deal

There is danger whenever a system is at fault and whatever that fault happens to be
Its best to start as you would be expected to go on,get the problem sorted,then move on, rather than trying to explain it away on a bit of paper

 

[telectrix]

how can there be a N-E fault when there's no cpc??????? or have i missed something???

 

[Lilyrose08]

There is cpc's in the circuit just the switch lines are lacking them for some reason.

 

[Hobsoni]

Mate, there is nothing better than getting paid to look for someone else's faults.

 

[Kamikaze]

Lilyrose08, I assume you insulation resistance tested the circuit while it was still connected to the board. If it was on a TN-CS system then you would have got a reading through the components of the light fitting and the pme link. So there might not be a fault at all. Did you disconnect the neutral and earth at the board before you did the test?

 

[bigbaddave]

how can there be a N-E fault when there's no cpc??????? or have i missed something???

I missed that one....

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Something smells funny here...

 

[Geordie Spark]

I missed that one....

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Something smells funny here...

That'll be the green goo ................... or the B.S.

 

[Brightspark2]

As said if loads where still connected then youll be getting a false reading through them...