Do you mean 3 core and earth ,one cable ?
Is it a straight length and how long?
T&E in conduit is fine for a straight length but if you try to pull it round a bend it gets harder.
If it is a straight length of conduit then 1.5 T&E will go into a 20mm conduit but you need to consider all factors in any design.
What sort of conduit do you have in mind?
I think the real question is "why do you want conduit at all?".Anything that fits 3 x 1.5 T&E cables really
For 3 x 1.5 mm² T+E?20mm oval conduit is fine.
Even if it is 20 mm oval conduit with 3 x 1.5 mm² T+E in it. At the least, I think I would probably change 'can' to 'may'!Conduit is good, it can assist in future wiring alterations.
That's certainly true of singles in appropriate conduit. However, maybe I've been unlucky, but my experiences of trying to 'change things' when one has T+E in (particularly plastic) conduit are not very happy ones, even when there is just one T+E in the conduit, and far worse when there is more than one cable.Ok then, MAY. When it comes to concealed wiring, conduit is a godsend for changing things, especially when correcting DIY work, so I always promote conduit!!
Well, I have very rarely installed T+E in conduit myself (other than the occasional 'drainpipe' to get several cables through!), so whenever I have been trying to 'make changes', it has been someone else's work that I've been trying to change!I see. Some people (I'm not suggesting you) don't install it right.
If it can be done, it obviously is an advantage. Was this a single T+E cable, or multiple ones?Only yesterday I was able to utilise an existing conduit in a wall, which saved destroying a recently plastered wall.
One might say that the same could be said of some of the diabolical work that gets done - 'thinking of the next electrician' (and all the hours of work he'll get paid for when trying to sort out the mess)When installing wiring, always think of the next man - it could be you.
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