Network Cable in conduit under screed

Why use conduit, any plumbing pipe will do.

I had a detached garage built many years ago and asked the builder to drop in a 'duct' between the house and the garage foundations. He did using 100mm soil pipe. Great until you try to pull a couple of cables through it and discover that he laid it in sections without proper joints and included two right angle bends in the middle to avoid other services! A very difficult cable pull! Also acted like a drain and filled with water too! Carefully check what the builder does...
 
ban-all-sheds said:
But also run the sizes through this: http://www.rm-electrical.com/technical/conduit-and-trunking-capacity-chart/
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Interesting. I can but presume that those tables will have been fairly well validated, but I have to say that I am a little surprised that such an approach always work. The implication seems to be that any combination of cables will fit in a conduit of a particular size, provided only that the sum of the 'factors' for the cables is no greater than the 'factor' for the conduit - which, intuitively, I would not necessarily have expected to always 'work' - what do you think?

Kind Regards, John
 
Tipper said:
Why use conduit, any plumbing pipe will do.

I had a detached garage built many years ago and asked the builder to drop in a 'duct' between the house and the garage foundations. He did using 100mm soil pipe. Great until you try to pull a couple of cables through it and discover that he laid it in sections without proper joints and included two right angle bends in the middle to avoid other services! A very difficult cable pull! Also acted like a drain and filled with water too! Carefully check what the builder does...
Click to expand...

100mm within my concrete slab would concern me structurally. Perhaps unnecessarily. I am going to get these which are super cheap. Also I should be able to get some nice smooth large radius turns using a blowtorch to bend them which I would not be able to do with a 100mm soil pipe.

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You really don't want to go to a blowtorch for bending this type of conduit! Just some warmth from a hair dryer can be quite sufficient to make it easier to form gentle curves, using the bending spring as mentioned.
 
PBC_1966 said:
You really don't want to go to a blowtorch for bending this type of conduit! Just some warmth from a hair dryer can be quite sufficient to make it easier to form gentle curves, using the bending spring as mentioned.
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I've probably been watching too many people on youtube torching pipe. Hair dryer and spring it is.
 
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