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Topic Title: running cables behind external render ?
Topic Summary: safe zones ?
Created On: 06 July 2013 02:54 PM
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 06 July 2013 02:54 PM
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aligarjon

Posts: 2923
Joined: 09 September 2005

I have a customer that wants me to run cabling around an external wall to external lights before the walls are rendered. I can run the cable in the equivalent of the internal safe zones. (through from switch and strait up to light 1 then horizontally to next light) is this permitted ? I am struggling to find anything in the regs either way other than it feels rough . I would be tempted to do it with swa but that would be a nightmare to terminate and conduit probably too deep which leaves me T+E behind betal capping or in oval ducting. The circuit is rcd protected. The bedrooms have the dreaded laminate flooring .

Gary

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Specialised Subject. The Bleedin Obvious. John Cleese
 06 July 2013 04:13 PM
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daveparry1

Posts: 6381
Joined: 04 July 2007

I don't see why not, the permitted zones are not specified as being internal only are they. As a matter of interest, why did you mention metal capping? I suppose it would give a bit more protection from the renderers's trowel but i'm just checking that you don't think it will be any more compliant than plastic,

Dave.
 06 July 2013 04:45 PM
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geoffsd

Posts: 392
Joined: 15 June 2010

Accessories on the other side of the wall only count if the wall is 100mm. thick or less.

Can't earthed metallic sheath cable be used?
 06 July 2013 05:07 PM
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peteTLM

Posts: 3233
Joined: 31 March 2005

Originally posted by: geoffsd

Accessories on the other side of the wall only count if the wall is 100mm. thick or less.



Can't earthed metallic sheath cable be used?


BS8436 cable

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Lack of planning on your part doesn't make it an emergency on mine....

Every man has to know his limitations- Dirty Harry
 06 July 2013 05:40 PM
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daveparry1

Posts: 6381
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Geoffsd, I don't think the accessories will be on the other side of the wall? Th op is talking about external lights with external cabling,

Dave.
 06 July 2013 06:49 PM
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perspicacious

Posts: 7267
Joined: 18 April 2006

Would installing YT1 mini-trunking for the plasterer to render flush up to either side of it so that it remains obvious, be acceptable?

Regards

BOD
 06 July 2013 07:13 PM
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geoffsd

Posts: 392
Joined: 15 June 2010

Originally posted by: daveparry1

Geoffsd, I don't think the accessories will be on the other side of the wall? The op is talking about external lights with external cabling,

Yes, you're right - Sorry.

Misread 'through from switch and straight up (to light 1)'
 06 July 2013 09:46 PM
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jcm256

Posts: 1942
Joined: 01 April 2006

Install pvc cable on an outside wall then plaster over, it might be a small point , but you will want to consider penetrating damp, big fluxions in temperature, trellis or lattice drilled screwed or nailed to the outside wall, degeneration of cables in contact with cement, (although they say modern PVC cables not affected as much as older cables). I would say get a bit of pyro or guardian Ali-Tube/LSZH Cable BS8436 and the chances that this install will be less open to degeneration.

(What ever happened to the rule you must be able to withdrawn cables from containment for future renewal).
 06 July 2013 10:41 PM
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aligarjon

Posts: 2923
Joined: 09 September 2005

thanks for the replies guys.

I think there might be a problem with plastic trunking expanding etc breaking the seal of the render and getting water behind it ?

I know what you mean JCM , they don't seem to worry about it when they dot and dab all these houses and just clip down the walls. its common practice right or wrong.

The capping is just a bit of protection from the trowel as you say Dave.

I think i'm going to turn this one down though, it just seems really rough to me.

Gary

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Specialised Subject. The Bleedin Obvious. John Cleese
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