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Topic Title: Zones
Topic Summary: safe ?
Created On: 13 October 2015 08:03 PM
Status: Read Only
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 13 October 2015 08:03 PM
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Ampman

Posts: 1264
Joined: 06 February 2006

Evening ,

i first fixed a extension for a builder 2 weeks ago which included outside lights either side of the patio doors , i ran wiring internal & drilled out to the lights as ive always done for past 20 + years .

builder said building inspector requires these cables to be steel capped ( cos of curtain rail fixings etc ... )

the said cables are 150mm from the edges of walls so are in safe zone anyway , cables will be rcd protected ,

any body eles see a problem with this ?

i read the regs & they state that the zone extends on the reverse side of the wall but only if wall 100 mm thick or less , the walls in the extension are 300mm including cavity ,

cheers

should the capping be earthed ?
 13 October 2015 08:12 PM
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perspicacious

Posts: 7854
Joined: 18 April 2006

should the capping be earthed ?

http://www.theiet.org/forums/f...d=63107&enterthread=y

Regards

BOD
 13 October 2015 08:20 PM
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Ampman

Posts: 1264
Joined: 06 February 2006

cheers Bod,

thanks ,
 13 October 2015 08:21 PM
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AJJewsbury

Posts: 15838
Joined: 13 August 2003

If cables definitely are <150mm from the sides the inspector clearly isn't working to BS 7671 requirement. Steel capping is unlikely to satisfy BS 7671 for mechanical protection - nails easily piece it after all - and even if earthed it wouldn't satisfy the requirements for concentric earthed protection either (has to be conduit, trunking or certain specified cable types).

It could be that the inspection is simply making a "suggestion", probably based more on his experience than bookwork, that steel capping may well provide some protection from relatively blunt DIY masonry drill. Or perhaps he expects the walls to be wet plastered and is thinking of protection from the plasterer's trowel.

- Andy.
 13 October 2015 08:24 PM
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AJJewsbury

Posts: 15838
Joined: 13 August 2003

i read the regs & they state that the zone extends on the reverse side of the wall but only if wall 100 mm thick or less , the walls in the extension are 300mm including cavity

I think that's just there to avoid the problem with thin walls where a cable serving an accessory in one room would also be <50mm deep from the surface of the wall of the room on the other side of the wall.
- Andy.
 13 October 2015 08:36 PM
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aligarjon

Posts: 3854
Joined: 09 September 2005

If there is a chance they might get hit by curtain poles take them sideways to the corner then up. (presuming they come through lower of course) After all its you that will have to put it right if they get hit.

Gary

-------------------------
Specialised Subject. The Bleedin Obvious. John Cleese
 13 October 2015 09:21 PM
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mikejumper

Posts: 2416
Joined: 14 December 2006

Originally posted by: Ampman
builder said building inspector requires these cables to be steel capped ( cos of curtain rail fixings etc ... )

the said cables are 150mm from the edges of walls so are in safe zone anyway , cables will be rcd protected ,

any body eles see a problem with this ?


I don't.
But the building inspector obviously sees a potential problem and has given a reason.

For a small amount of effort you can keep the inspector happy and get him / her on your side.

I'd fit the steel capping and perhaps double them up.
I wouldn't earth them.
 14 October 2015 07:27 PM
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Zoro

Posts: 300
Joined: 31 July 2011

Cable to BS8436 is useful for lighting when Safe Zones are not available, no need to cap either.

.
 14 October 2015 07:33 PM
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daveparry1

Posts: 7729
Joined: 04 July 2007

Steel capping would do bugger all as far as nails, drills or screws are concerned!
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