Hi folks,
My first post so hello! I’ve just put in a Hager 10 way split load CU at my in-laws and a new main isolator switch. They previously had an old rewireable fuse board, supply is via a 60A fuse and TT earth arrangement. No issues previously that I’m aware of.
I didn’t get time to do any proper testing as it was getting late and I’m going to do these and tidy up the installation on Monday but I connected all their old circuits - 2 x ring mains, 2 x lighting circuit, 1 boiler circuit and 1 cooker circuit, 1 of each type of circuit split across each RCD.
Upon energising, the first RCD tripped with anything more than a 6a lighting circuit turned on, so the boiler and a ring main. However if I moved these two larger circuits to the other RCD, then it wouldn’t trip.
Equally, if I swapped a circuit over from the working RCD side to the tripping RCD side, it would trip.
The only circuits I haven’t tried swapping sides are the two lighting circuits.
So the issue doesn’t seem to be with any of the circuits as far as I can tell (though I’ve not tested anything yet) and I’m wondering if one of the RCDs could be faulty - either one is tripping and shouldn’t be, or the other one isn’t tripping and should be!
Any ideas, please?
Thanks!
My first post so hello! I’ve just put in a Hager 10 way split load CU at my in-laws and a new main isolator switch. They previously had an old rewireable fuse board, supply is via a 60A fuse and TT earth arrangement. No issues previously that I’m aware of.
I didn’t get time to do any proper testing as it was getting late and I’m going to do these and tidy up the installation on Monday but I connected all their old circuits - 2 x ring mains, 2 x lighting circuit, 1 boiler circuit and 1 cooker circuit, 1 of each type of circuit split across each RCD.
Upon energising, the first RCD tripped with anything more than a 6a lighting circuit turned on, so the boiler and a ring main. However if I moved these two larger circuits to the other RCD, then it wouldn’t trip.
Equally, if I swapped a circuit over from the working RCD side to the tripping RCD side, it would trip.
The only circuits I haven’t tried swapping sides are the two lighting circuits.
So the issue doesn’t seem to be with any of the circuits as far as I can tell (though I’ve not tested anything yet) and I’m wondering if one of the RCDs could be faulty - either one is tripping and shouldn’t be, or the other one isn’t tripping and should be!
Any ideas, please?
Thanks!