On Fri, 14 Jan 2005 14:12:07 +0800, Old Nick
vaguely proposed a theory
.......and in reply I say!:

remove ns from my header address to reply via email

hmm....unusually slow response.

HOWEVER. I realised (and meant to post) that it may well have nothing
to do with voltage drop, but simply the cable's ability to carry the
current without burning up the shop. Hence although the original cable
is short, to carry the 400A it has to be large.

I am going with 50mm^2. It is not that much more expensive and cannot
hurt.

I have googled unsuccessfully. I have data about voltage drops etc.
But what is acceptable?

Is there anywhere that I can find what are of wire I need, given my
expected current and length of wire?