In article ,
Lobster writes:
Andrew Gabriel wrote:
You haven't said what type of earthing your system is.

At the risk of provoking a
"what-the-hell-are-doing-rewiring-for-if-you-don't-know-this-for-chrissakes-get-a-pro-in"-type
response, what significance does the earthing system have on the circuit
design? In mine, it's provided by the armoured sheath of the main
supply cable; have to say I don't know any more than that. Do I need to
find out?

If the system was a TT system with your own earth rod, the
use of RCD's would have to be different.

--
Andrew Gabriel