[M0FYA Andy]

Originally Posted by David Simpson

I suspect, Andy, that all the oversize hobbit buildings on the site have their own RCD controlled Consumer Unit. Thus will trip off everything when a duffer does something silly with mains equipment, or even problems with lighting. Extra caution with thatched rooves & timber construction.
On the other hand, many modern domestic CU's have split MCB circuitry buss bars, where only ring mains, cooker, imm'n heater, shower, etc. are rcd protected. Lighting circuitry is often un-rcd'd so that residents can still see what the heck is going on in an emergency. Or you can just have the lights next to your fuse cupboard, passageways & halls, and exits left un-rcd'd.
(RCD = Residual Current Device, sometimes called "Earth Fault Trip").

Regards, David

I still suspect it was a fabrication! Funny that the BBC's equipment kept running...……….

Andy