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PostPosted: Sat Oct 28, 2017 2:10 pm 
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Just doing a bit of reading for my own amusement, I came across these rules for putting cables in walls. I'm a little confused, so would welcome some clarification.

"A cable concealed in a wall or partition must

a) be at least 50mm from the surface [note 1]

b) have earthed armouring or an earthed metal sheath (eg SWA, a BS 8436 cable or MICC cable)

c) be enclosed in earthed steel conduit or trunking

d) be provided with mechanical protection (3mm steel is deemed sufficient to meet this requirement)"

http://wiki.diyfaq.org.uk/index.php/Cable_Routes_and_Protection

So, fitting a light switch in a brick wall does the cable need to be encased in earthed conduit?

Some years ago I installed a light switch on a solid wall in preparation for plastering. I covered it with a thin strip of steel purpose made for the job. It wasn't 3mm thick nor was it earthed. Is this now illegal?


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PostPosted: Sat Oct 28, 2017 2:30 pm 
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Read it all.
ie.

OR
e) be installed in a safe zone .
The 17th edition also requires cables in the safe zone to have 30mA RCD protection if not installed as per a, b, c or d.
Note 1 - If the wall or partition is made from or partially made from metal then the cable will require RCD protection or be installed as b), c) or d) above


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PostPosted: Sat Oct 28, 2017 4:15 pm 
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As said some ands and so ors so when protecting with a 30 mA RCD which will operate within 40 mS and having cables in the safe zones then it does not need an outer earthed covering.

Where is does require it, then the covering has to comply, I don't know why YY cable is not included on the list, much is common sense but some bits don't seem to follow that idea.


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PostPosted: Sat Oct 28, 2017 5:39 pm 
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In reality 99% of sparkles run cabling in the loft that’s covered by glass wool. They run cables in stud partitions that are covered in glass wool. Never see conduit used in domestic instances nowadays or new build houses.


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PostPosted: Sat Oct 28, 2017 6:16 pm 
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Permitted zones are horizontally and vertically within the width/height of the socket/switch whatever and require no protection. outside of that over 50mm depth and/or protected by suitable conduit/capping.

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PostPosted: Sat Oct 28, 2017 8:48 pm 
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Cheers, guys. When I read 'safe zone' I immediately thought of the bathroom zones, so didn't think it applied to stud walls. I guess as long as there's an RCD back at 'base' then you're pretty well covered.


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