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Topic Title: Losing Heat through Wiring Accessories.
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Created On: 09 March 2019 01:49 pm
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09 March 2019 01:49 pm
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Zoomup

Posts: 6117
Joined: 20 February 2014

Is this possible in the U.K?

http://www.bing.com/videos/sea...AC15ACF32&FORM=VDQVAP

Z.
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09 March 2019 02:26 pm
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broadgage

Posts: 3170
Joined: 07 August 2007

Probably a lesser problem in the UK because our winters are less cold than in many parts of the USA, our electrical boxes are smaller and less numerous, and our walls are more solid.

Still worth considering though.

Think twice about applying extra thermal insulation in or around electrical boxes, remembering that UK regulations allow much higher cable loadings, and thus higher operating temperatures, than are allowed in the USA.

If designing my own home I would place electrical outlets on inside walls so far as possible.
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09 March 2019 05:44 pm
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AJJewsbury

Posts: 17795
Joined: 13 August 2003

Also consider the related problem of condensation - especially where a flush box cuts through a vapour barrier (e.g. with foil backed plasterboard). I've seen some back boxes from I think Germany that had membrane grommets specifically to stop warm moist air getting into the thermal insulation.

- Andy.
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09 March 2019 06:03 pm
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dustydazzler

Posts: 3068
Joined: 19 January 2016

This particular video was shot in America by the looks.

They are usually fully timber framed houses , the older style house have little to no wall insulation

Newer houses in Canada and America get a good spray with foam cavity insulation spayed between the joist uprights or packed full or itchy insulation and then sealed with vapour barrier like plastic sheeting

Back boxes that break the vapour barrier require a special plastic shroud and are tapped up then the back box is fitted
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09 March 2019 08:48 pm
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aligarjon

Posts: 4053
Joined: 09 September 2005

I have worked in many modern houses and extensions where you can literally feel a draft coming through the back boxes because of the dot and dab on the solid walls.


Gary

-------------------------
 Specialised Subject. The Bleedin Obvious. John Cleese
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IET » Wiring and the regulations » Losing Heat through Wiring Accessories.

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