Hi, as part of a kitchen re-fit I had to have the consumer unit replaced and new earths provided. The work was carried out by the kitchen fitter's electrician. To say I was less than impressed with the electrician would be an understatement, but that's a different story!
He told me it was not unusual after a consumer unit is changed for earth leakage problems to be highlighted by the sensitivity of modern RCD units. However, after the changeout I was lucky it seems, as there were no apparent problems.
Today I decided to replace the dining room light fitting. When I unscrewed the rose, I noticed that one of the earth wires was disconnected. I reconnected it when I fitted the replacement rose, but when the RCD was switch on again, the RCD group switch (MCD?) tripped out. Disconnecting the earth again allowed it all to work again.
Using a meter, I discovered that there was no earth on the earth wire coming from the direction of the supply. Checking the next ceiling rose along, the cloakroom, I found the earth in there had also been disconnected. Note these weren't wires broken off, but terminals unscrewed and earth wires removed.
I know I wouldn't have left them like that, so it looks like when the consumer unit was changed, the electrician had problems with the downstairs RCD lighting circuit tripping. Rather than sort the problem out he disconnected the earths to get round it - and left it that way.
I'm guessing the earths are pretty important! However, it's just possible I suppose that maybe when modern RCD are fitted they're not. Before I go back to the electrician, who I don't trust one little bit, I want to be sure I've got my facts right.
What would be the view of the forum on earths left disconnected on lighting circuits to prevent RCD's tripping?