I'm only going on our panel, which is perhaps slightly non-standard due to another UK electricity quirk [1], but was done by an electrician last year so is up t

I'm only going on our panel, which is perhaps slightly non-standard due to another UK electricity quirk [1], but was done by an electrician last year so is up to regulations at least. It has a split in the bus, so there are two RCDs, one on the left with a couple of breakers and one on the right with the rest of the breakers, and a separator in the middle. Like: supply in -> R-B-B | B-B-B-B-B-R <- supply in C R R | R-R R R R C neutral -> D-K-K | K-K-K-K-K-D <- neutral [1] The quirk of our board is that the left hand breaker is driven by a separate supply cable from the meter, which is only turned on between midnight and 7am. In this way, we get cheaper electricity at night which is used for storage heaters and immersion water heater. However, we no longer have the storage heaters, so it doesn't really make sense. This set up is called Economy 7 (http://en.wikipedia.org/wiki/Economy_7 http://en.wikipedia.org/wiki/Economy_7). Also, @alextingle, I didn't know that you were meant to have two separate circuits, although that makes sense. Lots of things are required to be RCD protected in the UK, so as you say, it makes sense just to put everything behind an RCD. We don't get any nuisance trips, which I attribute to a generally higher standard of wiring, earthing etc. in the UK, although that could just be jingoism :) (I did once live in the US and some of the literally fraying wiring connected to two pin sockets with no earthing in the house I lived in scared me.)