In article , Dark
Angel writes

"Lobster" wrote in message...
I've seen plenty of non-split-load CU's for sale complete with RCDs at the
likes of Screwfix (eg http://tinyurl.com/bb2ej); I understand it's not a
good idea to have all circuits protected by an RCD, but when/why would it
be actually against regs to fit one of these as a whole-house CU?

I don't know about being "against the regs" but certain items, such as
immersion heaters, can cause "nuisence trips" even though there's nothing
wrong with them. That's why they should be connected to a non-rcd fed
source.


If theres nothing wrong with them, then they won't cause an RCD trip.
When they do cause RCD trips then there is something starting to go
wrong with them!.....
--
Tony Sayer