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Topic Title: Cables in Safe Zones
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Created On: 11 July 2013 11:28 AM
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 11 July 2013 11:28 AM
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Avatar for Legh.
Legh

Posts: 3472
Joined: 17 December 2004

Being a Friday, well to me anyway

What would be your consensus about running cables under dot and dab on a gable wall along the line of the roof joists?

Legh

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 11 July 2013 11:56 AM
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AJJewsbury

Posts: 11284
Joined: 13 August 2003

If I'm picturing this right - interior wall of a room with a sloping ceiling? I don't think it's entirely clear from 522.6.101, but my reckoning is that the 'top of wall' safe zone is the top 150mm of the wall regardless of the angle it meets the ceiling (or anything else).

My guess is that the 150mm should still be measured vertically, so if the ceiling was at 45 degrees you'd get a band about 106mm wide measured perpendicular to the ceiling surface.

I reckon the safe zone should likewise drop around perlins and such like where they form the top edge of the wall.

- Andy.
 11 July 2013 04:06 PM
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Avatar for Legh.
Legh

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Joined: 17 December 2004

Thanks Andy,
I thought the same although the hypotenuse length formed by the perpendicular seems a little 'Building Control officer' thinking, then I suppose that's who we have to keep sweet....

Legh

-------------------------
Why do we need Vernier Calipers when we have container ships?

http://www.leghrichardson.co.uk

"Science has overcome time and space. Well, Harvey has overcome not only time and space - but any objections."
 11 July 2013 08:19 PM
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MrOther

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If the ceiling slopes, then the ceiling zone slopes with it relative to the degree of slope keeping a distance of 150mm.
 11 July 2013 08:39 PM
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Rulland

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Are you sure?, I reckon BC would have us use Pythagoras's theorem as it's so much easier than common sense prevailing isn't it.

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