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Topic Title: zone advice please guys
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Created On: 24 July 2016 06:06 PM
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 26 July 2016 07:01 PM
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weirdbeard

Posts: 3116
Joined: 26 September 2011

Just take a pic of first fix and print it out with cert, then it's connected on paper as well as in theory

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 26 July 2016 08:17 PM
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AJJewsbury

Posts: 15838
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so a zone is created on the opposite side to the wall of an accessory ? i never work to that as seems crazy.

I suspect you're thinking about that the wrong way around. Say you had a partition wall built using 63mm CLS studs - you drop a cable vertically down through the centre of the nogins to a switch - so 30-40mm deep from the plasterboard surface - less than 50mm deep, but all within zones you say so fine. But no says Mr DIYer, I was drilling less than 50mm deep from the other side of the wall - where there isn't a switch to warn me of the cable's presence. What that bit of the reg is doing is giving you a get-out clause so you don't have to start putting in dummy switches or enclosing cables in steel conduit (or BS 8436 cable, or MICC, or...) just because the wall/partition is a bit on the thin side.
- Andy.
 26 July 2016 08:33 PM
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goldenboy1818

Posts: 812
Joined: 22 February 2011

Thanks Andy. What do you think about the issue of me trying to get these cables in a zone
 26 July 2016 08:49 PM
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geoffsd

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I think it would be better to call the cable routes 'danger' zones.

That is - horizontally or vertically from an accessory is a 'danger' zone where there are likely to be cables.
Similarly in a <100mm. thick wall or partition, the other side is likely also to be a 'danger' zone where the cable may be encountered,

Along with the 150mm. from ceiling or corner, these are the only zones allowed to be used as 'danger' zones.
 26 July 2016 08:56 PM
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AJJewsbury

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Like I said before, I'd be happy enough with a socket (or other accessory) 'marking' the zone for your cables (regardless of the precise wording of the regs - it seems no less safe to me). Or if you can get them within 6" of a corner, you could use the edge zone without further ado. Failing that you've got all the concentric earth options...
- Andy.
 26 July 2016 08:58 PM
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aligarjon

Posts: 3854
Joined: 09 September 2005

Originally posted by: AJJewsbury

so a zone is created on the opposite side to the wall of an accessory ? i never work to that as seems crazy.


I suspect you're thinking about that the wrong way around. Say you had a partition wall built using 63mm CLS studs - you drop a cable vertically down through the centre of the nogins to a switch - so 30-40mm deep from the plasterboard surface - less than 50mm deep, but all within zones you say so fine. But no says Mr DIYer, I was drilling less than 50mm deep from the other side of the wall - where there isn't a switch to warn me of the cable's presence. What that bit of the reg is doing is giving you a get-out clause so you don't have to start putting in dummy switches or enclosing cables in steel conduit (or BS 8436 cable, or MICC, or...) just because the wall/partition is a bit on the thin side.

- Andy.




The reg doesn't stipulate a stud partition, it says a wall up to 100mm thick, admittedly most blocks or bricks alone are probably 100mm without the plaster so most would be more than 100mm.


Gary

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Specialised Subject. The Bleedin Obvious. John Cleese
 26 July 2016 09:00 PM
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aligarjon

Posts: 3854
Joined: 09 September 2005

Originally posted by: goldenboy1818

Thanks Andy. What do you think about the issue of me trying to get these cables in a zone


Well you have 2 choices, fit the socket like you wanted to in the first place. ( Thats what i would do).

Or re-route the cables to the corner presuming you can't get them 50mm into the wall.

Gary

-------------------------
Specialised Subject. The Bleedin Obvious. John Cleese
 26 July 2016 09:02 PM
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AJJewsbury

Posts: 15838
Joined: 13 August 2003

The reg doesn't stipulate a stud partition, it says a wall up to 100mm thick, admittedly most blocks or bricks alone are probably 100mm without the plaster so most would be more than 100mm.

Indeed - I was just using the stud partition as an example. That said, my first house had internal walls built of cinder/breeze blocks just 2" think (discovered the hard way when the drill went straight through the wall )
- Andy.
 27 July 2016 02:16 PM
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carolpalmer

Posts: 4
Joined: 27 July 2016

Partition seems to be practical. Go for steel runners and stud
IET » Wiring and the regulations » zone advice please guys

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