In article ,
wrote:
Can you use the cable
without it's external white rubber sheath when it is inside plastic
conduit ? This would obviously give a lot more room and make feeding a
single wire at a time easier. The PVC conduit itself must surely be
performing the same if not far better job than the white sheath.

Yes, it is normal practice to use unsheathed cable inside conduits.
There are special lubricants available to make it easier to feed cable
through conduits (tallow comes to mind, is that right?)

IIRC, single cable has rather thicker insulation than those used inside
TW&E.

--
*Eagles may soar, but weasels don't get sucked into jet engines *

Dave Plowman London SW 12
RIP Acorn