Guru
Joined: 26/09/2020
Location: AustraliaPosts: 712
| Posted: 07:45am 22 Feb 2025 |
The rules have changed now for RCDs as well. The new RCDs are Type A. They are designed for circuits that have switchmode power supplies that may have a DC component on the circuit.
So all new RCDs and all upgrades have to have Type A RCDs.
I have seen RCDs trip from dust on the back of power points, as others have said from critters such as Rats chewing wires ( I have come across many bare wires in houses where the sheathing and insulation has been eaten)
So you will have to do the test as you suggested, turn each breaker off, then turn on one at a time to find which circuit has the fault.
good luck
Pete