Existing garage supply query

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28 Feb 2007
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My garage is fed from the non-rcd side of my CU. The 3 way board in the garage has a 2 pole rcd main switch. does the swa, running under my concrete path need Rcd protection itself? or is it ok as it is?
 
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No, not the swa itself. There are only certain circumstances where it would be:-

1]If the house earthing system was TT then all circuits need RCD protection.
2]Under new regulations if any non-armoured cable in the house feeding the swa was buried less than 50mm. (Assuming the swa didn't go right back to the CU)
 

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