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Good Practice

RustyH

Just wondered

Does anyone else do these two things. 

1) add a radius to cables going trough and then along joists to put less stress on the cable with tight bends?

2) due to the nature of low cost manufacturing, I find the edges of the fire rated clips to be sharp enough to cut in to the insulation if any manoeuvring of cables is carry out. So I add a plastic clip at any bend or end of run, so give a "softer" fixture at any possible movement point.

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    Sorry, wasn't referring to drilling or notching loft joists, instead clipping to the sides but below the 50mm requirement. As I had read that the sides of joist can be vulnerable, so the 50mm requirement should be applied there also?

    The regs requirement is just for holes. Clipping on the side of the joist does pose a bit of a risk in terms of fixings 'just missing' the joists - if the ceiling plasterboard is already up then the risks are probably small since non-ones likely to be putting any more plasterboard fixings in - and there is a thermal advantage where there is insulation to having the cable close to the plasterboard rather than mid-way up the joist where it'll be surrounded with thermal insulation on three sides and not particularly thermally conductive timber on the fourth. So no one single answer really, just whatever's least worst for the particular circumstances.

       - Andy.

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  • 0

    Sorry, wasn't referring to drilling or notching loft joists, instead clipping to the sides but below the 50mm requirement. As I had read that the sides of joist can be vulnerable, so the 50mm requirement should be applied there also?

    The regs requirement is just for holes. Clipping on the side of the joist does pose a bit of a risk in terms of fixings 'just missing' the joists - if the ceiling plasterboard is already up then the risks are probably small since non-ones likely to be putting any more plasterboard fixings in - and there is a thermal advantage where there is insulation to having the cable close to the plasterboard rather than mid-way up the joist where it'll be surrounded with thermal insulation on three sides and not particularly thermally conductive timber on the fourth. So no one single answer really, just whatever's least worst for the particular circumstances.

       - Andy.

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