Hi all
Hope you can help me. I have a split load MEM CU, a few months ago, I started getting occasional RCD trips. Recently these have become more frequent and I'm now trying to get to the bottom of what's causing it.
I have 2 MCBs on the RCD protected side of the board and 4 on the non RCD protected side. The protected ones are: socket ring main, cooker. The non-RCD protected are: 2 x lighting ring, smoke detector, water heater.
I've tried the following to trace the issue:
Isolating appliances - fridge freezer powered from cooker socket, cooker turned off at cooker socket and socket ring main isolated at MCB. Trip still occured.
Swapped cooker circuit with water heater circuit so that I could power fridge freezer from non-RCD protected circuit and avoid defrosting. Note my cooker is only a single over so the 16A water heater MCB should be sufficient. Can now isolate both RCD protected circuits at MCBs. Trip still occurs even with both RCD protected circuits isolated by their MCBs.
Removed many (not every) socket and fused spur faceplate to check for water ingress. No evidence of water in any of them.
Measured neutral to earth resistance (with CU off at main switch) of each circuit with the neutrals removed from the bus bar. All circuits reported open loop so no clue as to potential earth leakage from here.
Electrician popped round and tested the RCD which is working fine and not tripping early.
I'm waiting for him to get back to me with a date as to when he can do a full investigation.
In the mean time are there any more things you guys can suggest I could try. The trips are getting more frequent and driving me mad although at least the fridge freezer is no longer defrosting.
Could it be electrical noise from the fridge freezer triggering the RCD even though it is not on an RCD protected circuit?
Thanks
Russ
Hope you can help me. I have a split load MEM CU, a few months ago, I started getting occasional RCD trips. Recently these have become more frequent and I'm now trying to get to the bottom of what's causing it.
I have 2 MCBs on the RCD protected side of the board and 4 on the non RCD protected side. The protected ones are: socket ring main, cooker. The non-RCD protected are: 2 x lighting ring, smoke detector, water heater.
I've tried the following to trace the issue:
Isolating appliances - fridge freezer powered from cooker socket, cooker turned off at cooker socket and socket ring main isolated at MCB. Trip still occured.
Swapped cooker circuit with water heater circuit so that I could power fridge freezer from non-RCD protected circuit and avoid defrosting. Note my cooker is only a single over so the 16A water heater MCB should be sufficient. Can now isolate both RCD protected circuits at MCBs. Trip still occurs even with both RCD protected circuits isolated by their MCBs.
Removed many (not every) socket and fused spur faceplate to check for water ingress. No evidence of water in any of them.
Measured neutral to earth resistance (with CU off at main switch) of each circuit with the neutrals removed from the bus bar. All circuits reported open loop so no clue as to potential earth leakage from here.
Electrician popped round and tested the RCD which is working fine and not tripping early.
I'm waiting for him to get back to me with a date as to when he can do a full investigation.
In the mean time are there any more things you guys can suggest I could try. The trips are getting more frequent and driving me mad although at least the fridge freezer is no longer defrosting.
Could it be electrical noise from the fridge freezer triggering the RCD even though it is not on an RCD protected circuit?
Thanks
Russ