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Topic Title: Earthing Metal Portakabins
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Created On: 10 May 2013 02:12 PM
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 10 May 2013 02:12 PM
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Richard64

Posts: 231
Joined: 15 October 2009

I've had to do an EICR on an ongoing job (the present contractors have gone bust, and the client wants to know what needs putting right). I'm just doing a visual inspection and limiting it on the report.
Anyway, there is a supply to the site compound portakabins.
This has a 100ma RCD and no overload protection at the intake. It then runs to a locked cupboard, where I assume there is a DB supplying each container. There may well be overload protection in there, downstream of the supply cable.It is a TN-S supply.
My question is. As there is no reference to the local ground earth potential, should the cabins, or the supply at the MDU, be staked.
My feeling is that if the ground developes a potential (especially in wet weather) this may differ from the 'earthed cabins' and be hazardous.
Or am I just trying to be too clever?
 10 May 2013 05:34 PM
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BigRed

Posts: 558
Joined: 10 November 2006

It's TN-S, whats the loop at the cabins? Getting into the locked box is prudent here. How are things fixed in the cabins, how far away from the source are the cabins? is there a potential between the sheath earth and the cabin sides?
 11 May 2013 01:42 PM
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Richard64

Posts: 231
Joined: 15 October 2009

My understanding is that Caravans need the supply socket staking. (708.553.1.14 2nd part)
So these are not dissimilar.
Or are they?
 13 May 2013 11:17 AM
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BigRed

Posts: 558
Joined: 10 November 2006

Do people live in them, or are they for work
?
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