RCD faults

[rwood1981]

ok really strange had a customer today who I did a mains change for last week. Everything can be fine and then after a few hours left hand side of board trips. this covers lighting (with no earth!!) and 1 ring main. ring con ok. My initial thoughts was the fridge so plugged this in to other ring socket on right side to see if that tripped it. Left hand then tripped (ok not fridge) Got it down to a faulty laptop charger they said they had trouble with tripping when they took it on hols. That tripped the right side where no faults reported to date.
After this happened the rcd will not reset as if there is now borrowed neutrals but all was ok before charger was plugged in. Even with neutrals out it will not reset if there is load on left hand rcd. cant get my head around it maybe as it was getting on a bit and the charger seems to have put faults on right hand side rcd. any ideas please help!!!

 

[Pete999]

Were the tests, pre CU change satisfactory?

 

[Leesparkykent]

Neutral-earth fault on one the circuits. Not necessarily on the rcd that's tripping. What about the control wiring for the heating/hot water? Could the tripping coincide with the times this is set to come on?

 

[rwood1981]

Were the tests, pre CU change satisfactory?

one fault open circuit Neutral on right hand side ring as it is now That's it

 

[rwood1981]

Neutral-earth fault on one the circuits. Not necessarily on the rcd that's tripping. What about the control wiring for the heating/hot water? Could the tripping coincide with the times this is set to come on?

They did say it was happening at night more so this was my original thought I tried stat up and down all ok. Its a combi

 

[rwood1981]

Its just strange how suddenly the side where there was no problems is suddenly problematic??

 

[Leesparkykent]

They did say it was happening at night more so this was my original thought I tried stat up and down all ok. Its a combi

PIR on outside lighting?

 

[rwood1981]

PIR on outside lighting?

not a bad shout although no earth on lighting and I has happened during the day. I'm backmondy so may as well further investigate heatng controls

 

[Pete999]

one fault open circuit Neutral on right hand side ring as it is now That's it

Did you not rectify the fault?

 

[rwood1981]

yes sored fault

 

[sparksburnout]

not a bad shout although no earth on lighting and I has happened during the day. I'm backmondy so may as well further investigate heatng controls

Strange name.

 

[Deleted member 9648]

Once again I'm left at a loss that the last thing that seems to be mentioned is an IR test....that's the first thing I'd do.

 

[Octopus]

not a bad shout although no earth on lighting and I has happened during the day. I'm backmondy so may as well further investigate heatng controls

how exactly does no Earth on the lighting circuit affect this?

 

[PEG]

ok really strange had a customer today who I did a mains change for last week. Everything can be fine and then after a few hours left hand side of board trips. this covers lighting (with no earth!!) and 1 ring main. ring con ok. My initial thoughts was the fridge so plugged this in to other ring socket on right side to see if that tripped it. Left hand then tripped (ok not fridge) Got it down to a faulty laptop charger they said they had trouble with tripping when they took it on hols. That tripped the right side where no faults reported to date.
After this happened the rcd will not reset as if there is now borrowed neutrals but all was ok before charger was plugged in. Even with neutrals out it will not reset if there is load on left hand rcd. cant get my head around it maybe as it was getting on a bit and the charger seems to have put faults on right hand side rcd. any ideas please help!!!

Hi dude,what is a "mains change"? I know sea-change,sex-change,ex-change and spare-change...but me mains has remained maintained :cheesy:

 

[Octopus]

A fault on 1 side of an RCD board can trip the other RCD.

Do you have a clamp meter?