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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

    Really, it all hinges on how much load will be used in the garage. A few lights and a double socket for the lawnmower once a week is no worse than adding the same socket indoors for a desk with sewing machine and a table lamp. Fed from the ring, please with Isolation indoors, either as a fused spur or a double pole switch, is then perfectly OK.  It can then be isolated if there is a problem.

    there may be a 6A breaker and a 16A, but the load  maybe 13A or less .. (does it even need a CU, could it be just sockets with the light switch as a fused spur ?)

    But if the load is significant,  perhaps a DIYer /  car enthusiast doing welding, using air tools, running a fan heater  lathe whatever, or even a washer and tumble plus that lawnmower, then the picture changes, and the risk of problems increases. If there may ever be a car charge point added, it all changes again and we worry about TT and earth rods.

    If done from the ring for starters, perhaps do it in a layout so the end of the cable is available for a later upgrade  to a dedicated 32A radial if ever need be. At planning stage, that requires not much more than an over sized  box and maybe some glands.

    Mike.

Reply
  • 0

    Really, it all hinges on how much load will be used in the garage. A few lights and a double socket for the lawnmower once a week is no worse than adding the same socket indoors for a desk with sewing machine and a table lamp. Fed from the ring, please with Isolation indoors, either as a fused spur or a double pole switch, is then perfectly OK.  It can then be isolated if there is a problem.

    there may be a 6A breaker and a 16A, but the load  maybe 13A or less .. (does it even need a CU, could it be just sockets with the light switch as a fused spur ?)

    But if the load is significant,  perhaps a DIYer /  car enthusiast doing welding, using air tools, running a fan heater  lathe whatever, or even a washer and tumble plus that lawnmower, then the picture changes, and the risk of problems increases. If there may ever be a car charge point added, it all changes again and we worry about TT and earth rods.

    If done from the ring for starters, perhaps do it in a layout so the end of the cable is available for a later upgrade  to a dedicated 32A radial if ever need be. At planning stage, that requires not much more than an over sized  box and maybe some glands.

    Mike.

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