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External wall insulation and mains supply

Former Community Member
Former Community Member

I'm having external wall insulation installed on my house, and the mains supply to the house is via an overhead cable. The insulation installers have put the insulation over the mains supply cable, i.e. where it's clipped to the wall between bracket and meter box. The DNO is Western Power. 

My question is, is covering the mains PME cable with 90mm of insulation acceptable practice? 

Thanks, Pete

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  • 0

    If the cable belongs to Western power they will know if it is 35mm2 or 25mm2 or another, perhaps imperial, older  size. They should also know the fuse rating in your house, and therefore the maximum load you may draw.

    These two pieces of information  allow the suitability of the cable to be assessed - anything else is just guesswork - it may be slightly oversized,  and run cold at your maximum demand, it may be only just about OK in fresh air, and overheat significantly in normal use once lagged.

    Their daytime general enquiries number is  0800 096 3080 you should be sitting comfortably and ready to allow a bit of time to get past the “have a nice day”  screen before you get to someone technical who can advise.

    Mike.

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  • 0

    If the cable belongs to Western power they will know if it is 35mm2 or 25mm2 or another, perhaps imperial, older  size. They should also know the fuse rating in your house, and therefore the maximum load you may draw.

    These two pieces of information  allow the suitability of the cable to be assessed - anything else is just guesswork - it may be slightly oversized,  and run cold at your maximum demand, it may be only just about OK in fresh air, and overheat significantly in normal use once lagged.

    Their daytime general enquiries number is  0800 096 3080 you should be sitting comfortably and ready to allow a bit of time to get past the “have a nice day”  screen before you get to someone technical who can advise.

    Mike.

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