Lobster wrote:
You haven't said what type of earthing your system is.

what significance does the earthing system have on the circuit
design?

Lots.

If you don't understand the difference between TT, TN-C, TN-C-S, etc
then you really should not be doing the job.

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 you intend to do the re-cabling yourself then your follow-up
certificate which will be required may prove to be very expensive. If
you've hot-wired the earthing within the installation wrong then it will
need to be ripped out and started over. It will be cheaper and easier to
do the wiring correctly the first time.

Andrew

--
Please note that the email address used for posting
usenet messages is configured such that my antispam
filter will automatically update itself so that the
senders email address is flagged as spam. If you do
need to contact me please visit my web site and
submit an enquiry - http://www.kazmax.co.uk