Which Earthing do i have?

[Hightowermark]

Yes i have a RCD as the main switch it's a '30ma Trip' and '100a load'

 

[ban-all-sheds]

Well - that's OK, but it's a bit inconvenient to have the entire installation on one RCD - the usual approach with TT installations is a split-load board, with a 30mA RCD protecting the socket circuits, but with the main incomer a 100mA time-delayed RCD, so that a fault on something associated with a socket doesn't take out the lights etc. There are more sophisticated ways of doing it, with multiple RCBOs, but that starts to get expensive, and the normal 100mA/30mA split board is regarded as satisfactory by most people.

Have you got any home improvements coming up which would require a new CU? How long have you lived there? When was the wiring last inspected?

 

[Hightowermark]

Lived here about 16 months (had it 19m), the electrics were tested about a 14m ago as i extended the kitchen ring it tripped the very next day so called my friends dad who is a sparky. (turns out to be it was the drill i was using) and not my wiring So that was nice.

But he did mention that the Cu has a very sestive RCD and if it kept tripping he'll change it that was 14m ago and had heard a peep.

I want to change it in a few years as it's only got 7 points and 6 are in use, so it's not enough as i want garden electrics and that would have none free.