Insulation: does anyone know?
09 March 2012, 03:20 PM
#2
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Don't think it matters, under and over in various places in our loft. Would end up being a major re-wiring job if it all had to go under or over. Don't think the companies that supply and fit loft insulation would have a particularly easy time of it otherwise.
09 March 2012, 03:40 PM
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I may well stand to be corrected.
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09 March 2012, 07:25 PM
#8
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De-rating - can be done either by limiting the current in the wire (maybe a lesser-rated fuse on that circuit - or MCB, or whatever these things are called these days!) or by uprating the cable so that the current it can support is a lot more than that it will actually carry. The object being, as you can imagine, to limit the temperature it gets to.
I'm sure a chat with a friendly sparky will set you straight. Or more time on Google ....
Dave
09 March 2012, 09:16 PM
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If it's a lighting ring main, the wiring is likley to be over rated for the current so the additional insulation is likley to have little effect on the resistance.
Even a shower cable at 20A can still go under as the time it is on is likley to be short so again , it is not likley to over heat. Ideally though, it should go over.
The issue of hidden cables is just the same as cables in walls - look or scan before you drill/cut!
Steve
Even a shower cable at 20A can still go under as the time it is on is likley to be short so again , it is not likley to over heat. Ideally though, it should go over.
The issue of hidden cables is just the same as cables in walls - look or scan before you drill/cut!
Steve
09 March 2012, 09:20 PM
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Just asked my brother in law who is a sparky, he says makes no difference.
It never even occurred to me personally, I have reinsulated my loft and boarded over the top of it, the wires are under the whole lot.
It never even occurred to me personally, I have reinsulated my loft and boarded over the top of it, the wires are under the whole lot.