I am going to install a ring main in my back room, and will be laying the 2.5mm cabling in PVC conduit. Can I fit both 2.5mm t&e in one 20mm PVC conduit, and will there be any room for a 1.5mm lighting cable, or will I have to use 2 lengths of 20mm conduit?
Steve
What conduit are you using? Sounds like the round section stuff like this:
Can you describe your application - are you wanting surface-mounted wiring rather than (eg) burying it under plaster? If so, trunking is the stuff - something like:
David
Yes you can, but it'll be "interesting" getting it through any inspection elbows/tees without kinking/scuffing it.
I don't think you'll get away with that
Just about for short runs. Corners and Tees will be difficult though.
No chance!
Conduit is really designed for "singles" - not PVC clad cable.
What are you trying to achieve?
I have a 2in perimeter trench around the floor to lay the cable in, and will fill the trench with concrete once the cable is laid
I pity the poor bugger who is going to rewire that in 20 yrs ;)
P.
Then you would be better off using ducting designed for burying in concrete floors. It would make rewiring much easier at a later date too. Your local electrical wholesaler should be able to supply it.
Colin Bignell
I would be tempted to use the absolute maximum size of conduit I could get in.
32mm PP drain pipe is cheap and works well.On Sat, 1 Apr 2006 13:56:15 +0000 (UTC) someone who may be "Lawrence Zarb" wrote this:-
Why not do it properly, with suitably sized conduit or trunking? This would have inspection hatches where appropriate (certainly at the corners and where the junctions for the sockets are) and draw strings. Given that you will have mechanical protection up to the sockets why not wire the circuits with singles, rather then twin & earth? Then it can be extended and new circuits added with ease.
Is the lighting circuit just passing through the room?
You can go a lot longer than 20 years between rewires. I fell sorry for the poor buggers who will have to rewire the chipboard floored houses that they throw up now.
Adam
And is not a safe practice
I've got 2x2.5mm T&E and 1x1 mm T&E down a 20mm conduit. It is very tight and seriously not recommended. Obviously it is better to use singles. However, I had 100m of T&E and 0m of singles.
Christian.
Buried in concrete?
And no Stanley knife?! :-)
David
Yes Stanley knife. No insulated earth cable, just CPC which is no good!
Christian.
Ah, true! (But you can buy 3mm earth sleeving for 2GBP per kilometre from Screwfix: wonder if that would be allowed? Although making diy insulated earth cable would almost be as much fun as stuffing T&E down conduit...
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