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teaboyjim
Is it ever acceptable lay electrical cables in the screed?
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Maybe in conduit
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teaboyjim
I've been told it's bad practice and wanted to clarify
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Ask your "very bad" person, why not?
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Who's signing off the documentation "someone" or the electrician.
It's fine in the screed, in conduit.
After all, that's how purpose-built flats were built.
After all, that's how purpose-built flats were built.
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teaboyjim
If the electrician did it in screed then he would do the work and sign it off.
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You need to find out why he frowns on such behaviour.
Regulation 522.6.4: “A wiring system buried in a floor shall be sufficiently protected to prevent damage caused by the intended use of the floor.”
It is very common to install cables in round high impact conduit in screeds. The conduit is usually fixed to the floor screed with galvanised saddles without the spacer bar. Ideally the conduit would have hand pulled bends at the walls and be terminated at accessories with a female adaptor.
Some firms spec galvanised conduit for floors, but the regs do not specifically require it, the regulation above is quite woolly. The regulation following the one above references suspended joisted floors, and does require a depth of 50mm or earthed steel conduit, but it doesn’t reference solid floors at all, just joisted.
It is very common to install cables in round high impact conduit in screeds. The conduit is usually fixed to the floor screed with galvanised saddles without the spacer bar. Ideally the conduit would have hand pulled bends at the walls and be terminated at accessories with a female adaptor.
Some firms spec galvanised conduit for floors, but the regs do not specifically require it, the regulation above is quite woolly. The regulation following the one above references suspended joisted floors, and does require a depth of 50mm or earthed steel conduit, but it doesn’t reference solid floors at all, just joisted.
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teaboyjim
I think they thought it was a hazard to someone breaking or cutting the floor in the future.
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teaboyjim
Thanks for such a spot on answer. These are all decisions I have to make now as I'm now in the process of making a plan of the job.
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When extensions are built it's pretty common for first fix wiring to go across the concrete floor slab before insulation goes down and screened over. Damn nuisance when electricians run cable diagonally - means having to cut insulation.
When I was building orangeries I got our electricians to run cables tight against the walls - they used plastic copex which they ran upto the sockets. We then laid 50 celetex leaving it short of the copex, then another layer over the top.
If you are running cables in a screed laid on concrete -I wouldn't recommend going across the middle of the room - that creates a weak point in the screed likely to cause a crack.
If it's in a kitchen, can you lay as much of the cable as poss surface mount behind units? - or is this an existing kitchen
When I was building orangeries I got our electricians to run cables tight against the walls - they used plastic copex which they ran upto the sockets. We then laid 50 celetex leaving it short of the copex, then another layer over the top.
If you are running cables in a screed laid on concrete -I wouldn't recommend going across the middle of the room - that creates a weak point in the screed likely to cause a crack.
If it's in a kitchen, can you lay as much of the cable as poss surface mount behind units? - or is this an existing kitchen
That argument could be applied to any cable buried in any structure, be it a wall or a floor.
How do you think all the floor 13amp and data sockets in offices were wired, other than buried in the floor.
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