On Sat, 07 Apr 2007 20:12:55 +0100, Owain
mused:

Lurch wrote:
You *must* run the lives, neutral and earth together in one conduit or
cable.
Says who?

"Single-core cables (without armour) enclosed in conduits or trunking
must be bunched so that the outgoing and return circuits are enclosed in
the same conduit or trunking. This must be accepted as a gnereal rule
for all ac circuits ... If single-core cables are enclosed in separate
metal conduit, trunking or metal armouring, the resultant induction
losses could be very marked, and cause considerable voltage drop and
overheating of the cables and the enclosure. A voltage drop of 90%, and
consuderable overheating, has been known when single-core cables,
enclosed separately in magnetic metal have been connected to an ac
supply" "Modern Wiring Practice", Steward & Stubbs, 10th Ed

Okay they talk about metallic conduit, but I think it would be Good
Practice to adopt anyway.

Yes, where possible\practicable, but I was under the impression it was
for metallic conduits and enclosures only so was just wondering what
your source was.

Cheers for quoting the source.
--
Regards,
Stuart.