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Topic Title: Some design Critique needed!
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Created On: 24 January 2013 07:29 PM
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 24 January 2013 07:29 PM
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earthing

Posts: 56
Joined: 17 December 2008

Hello,

I would dearly like some feedback on my proposed solution for a new shed supply.

Its a PME supply, shed is timber framed installed less than a foot from the gable end wall and the run is 28m. Current fuse board has no RCD protection and the earthing and bonding are 10mm. The main fuse is a 60 amp 1361.

My proposed solution is to install a metal clad 32 amp isolator and run a 4mm two core armoured cable to the garage. The armourings will act as the downstream cpc. I was planning on feeding the 32 amp isolator via 16mm double insulated meter tails installed in pvc trunking.

In the shed itself, potentially in the future a water supply may be needed as the shed is being used to manage business affairs. I decided to install a TT system and insulate /terminate the incoming earth armourings.

I have not proposed to install rcd protection for the downstream armoured but have done so for the shed final circuits.

Any feedback much appreciated!!

Daniel
 24 January 2013 07:47 PM
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Avatar for OMS.
OMS

Posts: 19455
Joined: 23 March 2004

Originally posted by: earthing

Hello,

I would dearly like some feedback on my proposed solution for a new shed supply.

Its a PME supply, shed is timber framed installed less than a foot from the gable end wall and the run is 28m. Current fuse board has no RCD protection and the earthing and bonding are 10mm. The main fuse is a 60 amp 1361.

OK


My proposed solution is to install a metal clad 32 amp isolator and run a 4mm two core armoured cable to the garage. The armourings will act as the downstream cpc. I was planning on feeding the 32 amp isolator via 16mm double insulated meter tails installed in pvc trunking.

Overcurrent protection and earth/fault short circuit protection on the SWA.?

16mm2 is a bit mental for a 32A supply with 4.0mm2 conductors


In the shed itself, potentially in the future a water supply may be needed as the shed is being used to manage business affairs. I decided to install a TT system and insulate /terminate the incoming earth armourings.

OK - where does the water supply come from and will it be metallic ?


I have not proposed to install rcd protection for the downstream armoured but have done so for the shed final circuits.

OK - no real problem with that - ensure you keep good seperation between the armouring and the shed earth marshalling terminal


Any feedback much appreciated!!

See above


Daniel


Regards

OMS

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