On Sat, 25 Nov 2006 13:50:56 GMT someone who may be Guy King
wrote this:-

Except that on a split-load CU the lighting circuit won't have a RCD.

Having read the rest of this sub-thread, the question is, "so what?"
An earth fault that develops on its own isn't that common and of it
was installed properly there will be supplementary bonding.

The supplementary point is that not all ring mains have RCDs.


--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54