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Garage supply

Former Community Member
Former Community Member

Hi all,

 

I’ve recently been asked for advice and found myself reluctant to give an answer without a second opinion.

Question - 

Is it possible to run in a garage supply using 4mm SWA off the house ring and protect the garage via a CU - 25A RCD with 16A and 6A MCB for sockets and lighting? 

The garage is located at the very back of the house, the DB is at the very front and there is one ring circuit for the upstairs and downstairs (Kitchen is on its own ring).

My personal opinion would be to run in a new supply from the board in the house, however accessibility is supposedly an issue and the house has been recently renovated. For which reason this method of supply has been suggested. 
 

Many thanks in advance,

 

Jack 

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  • 0

    Agreed - and by the definition of final circuit in BS 7671, a circuit downstream of an FCU where the branch cable can't be protected by a B32, is effectively a final circuit in its own right …

    The differentiator is required, of course, because of the way that Reg 433.1.204 is written, basically if it's not a ring final circuit (which a distribution circuit can't be) then protection against overcurrent for BS 1363 accessories is all down to the designer, you can't rely on the “standard circuit” acceptance because it's no longer a ring final circuit.

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  • 0

    Agreed - and by the definition of final circuit in BS 7671, a circuit downstream of an FCU where the branch cable can't be protected by a B32, is effectively a final circuit in its own right …

    The differentiator is required, of course, because of the way that Reg 433.1.204 is written, basically if it's not a ring final circuit (which a distribution circuit can't be) then protection against overcurrent for BS 1363 accessories is all down to the designer, you can't rely on the “standard circuit” acceptance because it's no longer a ring final circuit.

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