Some advice please

[hightower]

I'm a bit confused why a rewire is being taked about with results of 2-3Mohms? I realise that HT will probably find that the 2-3Mohms is only on one circuit after disconnecting the neutrals but even if they were on most circuits this is still >2'000'000 ohms of resistance to earth which does not even require investigation.

Sorry HT, I've read it a little slower this time and I see that you were probably realting the re-wire more to the contribution to earth leakage for each circuit.

I think I would do more testing and investigations and I bet you find a circuit or appliance that is causing more earth leakage than the others, you could then recitify that and give the install a few more years until the chap has passed on.

I find our approach to death pretty barbaric, we keep someone alive with tubes in every orifice and force feed them whilst they are in pain. A massive rewire seems a bit akin to this, causing huge disruption when it may well not be necessary. Fault find further and then a board change with RCBO's if really necessary.

To be fair, if you got called to a house and you were getting 2-3MOhms on each circuit you would probably suggest a rewire. 2Mohm doesn't REQUIRE investigation, but I wouldn't be happy working on an install ordinarily with readings as low as that. Yep, it might be fine for the now, but how long does that cable have left?

As I've said, I think in this instance I'd be happy to replace the board in a bid to get a few more years out of the wiring - but that wouldn't be my go to in every situation. I've taken on board what people have said about splitting the neutrals, and I've yet to get back for that. However, I did clamp the earth and turn each circuit on one at a time - and each circuit was individually contributing to earth leakage. Added to the fact this guy claims the problem has gotten progressively worse over 6 years tells me there's a general breakdown of insulation.

 

[Deleted member 26818]

Thought it was said, that the earth leakage increased as each circuit was energised?

 

[Dave OCD]

To be fair, if you got called to a house and you were getting 2-3MOhms on each circuit you would probably suggest a rewire. 2Mohm doesn't REQUIRE investigation, but I wouldn't be happy working on an install ordinarily with readings as low as that. Yep, it might be fine for the now, but how long does that cable have left?

As I've said, I think in this instance I'd be happy to replace the board in a bid to get a few more years out of the wiring - but that wouldn't be my go to in every situation. I've taken on board what people have said about splitting the neutrals, and I've yet to get back for that. However, I did clamp the earth and turn each circuit on one at a time - and each circuit was individually contributing to earth leakage. Added to the fact this guy claims the problem has gotten progressively worse over 6 years tells me there's a general breakdown of insulation.

I'm sorry if you've already mentioned it HT but are the cables as far as you know all PVC insulated ? Any sign of rubber anywhere and it would definitely want rewiring with the age that would be now.

 

[hightower]

Thought it was said, that the earth leakage increased as each circuit was energised?

It was said, hence each circuit must be individually contributing to the overall leakage.

I'm sorry if you've already mentioned it HT but are the cables as far as you know all PVC insulated ? Any sign of rubber anywhere and it would definitely want rewiring with the age that would be now.

I've not seen rubber, but I haven't done a massive amount of digging about