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be a better solution to bang a rod in . ( a proper one, before eng54 reads the thread.). probably got a decent Ze on the gas and water anyway.
 
My moneys on a N-E fault on the installation

agreed.
the DNO arent gonna do jack until
A. youve catagorically proved the fault is on their side of the supply or
B. other nearby properties are reporting the same problem.
and intermittant dno neutral faults will show other symptoms than rcd tripping.
 
Last edited by a moderator:
I have been reading this thread and i have been trying to remember a similar fault . It just came to me.

The rcd looks at the difference between the L and N. If you loose the neutral from the supply you then provide a false N from any bonding or earth spike or water pipe but it may not go through the RCD ....so no unbalance in the RCD. After all the earth and the neutral are really the same thing.
This is much the same as has already been stated but I am sure that I had a similar fault myself, a long time ago. This would explain why the RCD fails to trip on the button and everything else.

Isolate the CU
Disconnect the PME earth wire from the Earth block. ( stop and earth going back to the supply)
Test the voltage at the the meter or on the In connection of the CU isolator.
You need to be sure that there really in a neutral coming into the house.

I hope this helps and doesn't just confuse the situation even more

Phil
 
Incoming voltage??
Had a couple strange ones like this.
Reversed polarity, resulting in exposed parts being live!! Due to PME n-e connection.
And lost neutral, this would stop the Rcd operating as the Rcd does not have the correct voltage to operate.
Although I don't think this is the whole story for this one.
If you have done all your insulation tests this should rule out it being a internal fault, unless it's an appliance.
 
i'll put a tenner on it being a fault outside the customer's installation.
 
Crumbs cant afford that sort of money thats 2 hrs worth of labour in the present climate according to agencies
 
Well the op said he was called out to a fault
so it has been working
hes changed the main switch
DNO saying nowt to do with them
no new meter
hes done ir on circuits and all >20Meg
Im thinking it's an appliance that's started to Cause this problem it's the freezer with the lead pipe in the kitchen lol
 
or is it the rev. with a revolver in the dining room?
 

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