In article ,
Andy Wade wrote:
For a separate earth like this you will need 4mm^2 green & yellow
single-core earth wire. The cable type is called 6491X, but just ask
for "4 mil earth". You'll find that it has seven strands, not one, BTW.

If this is now the 'legal' size, does it mean the 1mm earth built in to
most lighting TW&E is not satisfactory?

--
*Certain frogs can be frozen solid, then thawed, and survive *

Dave Plowman London SW 12
RIP Acorn