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- 8 Oct 2005
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A friend had a problem with one of her ring circuits which I sorted out quite easily (pinched neutral was tripping the RCD) and she wanted one of the spare ways connecting to a radial for a freezer on the non-RCD side ... All okay.
Whilst sorting this out though I thought the configuration of the CU rather odd (and its only a few years old).
It was a 16 way MK split load unit with 100A incomer and 80A 30ma RCD with all the right circuits in all the right places and nicely wired up.
Odd thing was, it had a 100A service fuse and 16mm tails?
1. I thought 16mm tails were only rated to 90A and they should have been upgraded to 25mm?
2. The rating of the RCD is less than the rating of the service fuse. I would have thought that the service fuse should be of equivalent (or less) rating than any of the CU components?
Any thoughts?
Whilst sorting this out though I thought the configuration of the CU rather odd (and its only a few years old).
It was a 16 way MK split load unit with 100A incomer and 80A 30ma RCD with all the right circuits in all the right places and nicely wired up.
Odd thing was, it had a 100A service fuse and 16mm tails?
1. I thought 16mm tails were only rated to 90A and they should have been upgraded to 25mm?
2. The rating of the RCD is less than the rating of the service fuse. I would have thought that the service fuse should be of equivalent (or less) rating than any of the CU components?
Any thoughts?