Ask The Trades - Which earth for a SWA armouring?

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Ask The Trades › DIY Forum › Electrical Questions › Which earth for a SWA armouring?

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Which earth for a SWA armouring? (Read 2942 times)

Flashbang

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Which earth for a SWA armouring?
Oct 27^th, 2011, 6:22pm

Hi
A 6mm2 2c SWA runs from the 32A MCB and RCD protected consumer unit in the property approx. 25-30mtrs to a medium size shed. The cable is to be buried and covered with tape and sand then back filled. At the shed will be a 'local' distribution board with its own RCD and MCBs feeding the lighting and up to six double sockets.
It has been suggested that at the shed end a separate earth rod should be installed to proved the main earth for the shed.

Question is..... which end of the SWA armouring should be connected to which earthing terminal - Main property, Shed end or both?

« Last Edit: Oct 27^th, 2011, 6:23pm by Flashbang »

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Lectrician

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Re: Which earth for a SWA armouring?
Reply #1 - Oct 27^th, 2011, 6:33pm

If you rod the shed, you must earth the SWA at the house end, isolating by glanding into a plastic enclosure or CU at the shed.

The SWA would be fed from a non-rcd protected way in the house.

This is only usually done with PME supplies, and even then is not strictly required unless there are extraneous conductive parts in the shed that require main protective bonding (and even then you could use 10mm SWA instead and bond them).

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CWatters Super Member Offline "Daddy fick it" says James Posts: 5150 Total Thanks: 58 For This Post: 0 Gender:	Re: Which earth for a SWA armouring? Reply #2 - Oct 28^th, 2011, 10:39am I forget who first pointed me to this link but perhaps worth putting in the FAQ.. It redirects to a .pdf file. http://www.google.co.uk/url?sa=t&rct=j&q=electrical%2Binstallations%2Boutdoors%2...
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Flashbang Junior Member Offline I've been P'eeeeeeed Posts: 117 Total Thanks: 0 For This Post: 0 Gender:	Re: Which earth for a SWA armouring? Reply #3 - Oct 28^th, 2011, 1:54pm Thanks chaps.
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