"Lurch" wrote in message ...

On 25 May 2004 11:09:27 -0700,
(Lobster) strung together this:

is there any other info needed to assess the correct earth size?

Nope, that's it.

That's not quite true because of the note above Table 54H in the regs which
says "Local public electricity supply network conditions may require a
larger conductor" - so, strictly speaking, you should check with the
relevant distributor to see if they require a larger size.

I've no idea how often this applies, but when I used to have dealings with
the old Eastern Electricity on such matters they certainly preferred the use
of 16mm^2 main bonding. The issue may also come up in London, where fault
levels tend to be higher.

Given that you need a reel of 16 mm^2 cable for the main earthing conductor,
you may as well use the same size for main bonding, just to be on the safe
side, and avoid having to carry a reel of 10mm^2 as well.

--
Andy