Discuss Nuisance tripping. in the Electrical Forum area at ElectriciansForums.net

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Hi - if the IR tests are “in the meg Ohms” then it’s likely to be attached equipment. Perhaps turn everything on (plus boiler) and ramp test the tripping RCD. If it now trips below 15mA, start unplugging.
 
Hi - I second ramp test....however....one recent upgrade had the same issue, all tests ok. had customer to unplug anything not in use, tested all appliances...narrowed it down to possibly a cooker fault (still too random to actually id the fault ) new cooker, no issues. Sometimes it is not always black and white. Why not try another rcbo and move a circuit off the main RCD.
 
Several things spring to mind:

That IR reading is far too low for new wire
Did you wire it or just test it
Do you know which circuit has the low reading
Why a big dual board in a new home
Have you ramp tested the rcds
Could you reconfigure the board for rcbo's
Do you have outside circuits

Etc etc
 
Several things spring to mind:

That IR reading is far too low for new wire
Did you wire it or just test it
Do you know which circuit has the low reading
Why a big dual board in a new home
Have you ramp tested the rcds
Could you reconfigure the board for rcbo's
Do you have outside circuits

Etc etc
think OP's remit was a CU change.
 
I read post #3 where he mentioned "existing circuit"
 
If you talked through with the customer about their choices re RCBO and RCD CU's and explained how situations like this can occur (nuisance tripping/earth leakage) I dont think you owe them anything unless they want you to investigate at their cost.

If on the other hand you didn't talk through options then they are going to blame your work so you'll need to find the faulty appliance/fault at your cost.

Previous advice is as ever, great.

Good luck.
 

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