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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

    gkenyon: 
     

    If the circuit supplies a CU, then it's no longer a ring final circuit by definition.

     

    That started a thought experiment in my head:

    Starting with a ‘ring final’ type circuit - you could  fit a FCU on the ‘ring’ then feed two (or more) further FCUs from that FCU (if you wanted a ‘master’ switch, and then further switching of additional equipment which required fusing at a lower level).  Electrically, that's pretty much the same as feeding a 2-way CU from the ring if a FCU is used.  Is this arrangement then no longer a ‘ring final’ circuit, and if not then how does it differ fundamentally from feeding 2 x twin sockets from an FCU on a ring - the fuses just end up in the plugtops and not the FCUs?

    I'm not saying you should do this by the way…….

    A ring final circuit can have multiple fused and unfused spurs, with unfused spurs feeding multiple outlets and ‘look’ very much not like a ‘ring’ by the time you have finished with it!

    Jason.

Reply
  • 0

    gkenyon: 
     

    If the circuit supplies a CU, then it's no longer a ring final circuit by definition.

     

    That started a thought experiment in my head:

    Starting with a ‘ring final’ type circuit - you could  fit a FCU on the ‘ring’ then feed two (or more) further FCUs from that FCU (if you wanted a ‘master’ switch, and then further switching of additional equipment which required fusing at a lower level).  Electrically, that's pretty much the same as feeding a 2-way CU from the ring if a FCU is used.  Is this arrangement then no longer a ‘ring final’ circuit, and if not then how does it differ fundamentally from feeding 2 x twin sockets from an FCU on a ring - the fuses just end up in the plugtops and not the FCUs?

    I'm not saying you should do this by the way…….

    A ring final circuit can have multiple fused and unfused spurs, with unfused spurs feeding multiple outlets and ‘look’ very much not like a ‘ring’ by the time you have finished with it!

    Jason.

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