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Shed Supply From Ring Main

PG
A small (7ftx5ft) shed is to be located at the rear of a house. There will be a 2ft gap between the shed and the rear of the house.
The shed is to be used as a utility room, initially, with a tumble drier and freezer It will also have a frost protection heater and lighting.  If we allow a bit of power for future or garden tool use then there could be a max demand of about 18A. There are no other services planned (no water, gas or drainage). The 230V supply is TN-C-S
The house has a lightly loaded RFC on the inside wall by the shed and the proposal is to break into the RFC and loop the RFC through the shed. The RFC is supplied from a Consumer Unit that is located near the front of the house..
Not exactly a standard arrangement, probably wouldn’t even consider it if the shed was a few more yards down the garden but I haven’t managed to locate a statement in the Wiring Regs that precludes this approach. I wouldn’t have thought twice about extending an RFC through a conservatory.
 I wondered if the Forum thought that 465.1 (Emergency Switching) could come into force, say for isolating the shed in the case of a fire but I suppose that the shed isn’t too different from another room?

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  • 0
    As a rule of thumb for rings, unfused spurs should not exceed 1/8 the cable length from the spur to the furthest point in the ring.


    I am quite happy to spur from the far point in a ring, with more than a zero length cable,  if the ring is not already excessively long, and in any case doing it in a higher cross section cable would allow you to get further before Zs and Vdrop catch you out.

    Some of these rules of thumb if  quoted without their additional caveats and  applied willy nilly can be misleading. That is probably one of them ?


    T and E in some protection would probably do if the route is on show, but a box beside the indoor socket, and bring SWA into that and work on there, in the dry, would be my personal preferred, but only that, just  a personal house style. My experience of joints outside SWA or anything else, is that they mean trouble, and should be indoors if possible.

    (could look almost like  the photos here)

    Mike.

Reply
  • 0
    As a rule of thumb for rings, unfused spurs should not exceed 1/8 the cable length from the spur to the furthest point in the ring.


    I am quite happy to spur from the far point in a ring, with more than a zero length cable,  if the ring is not already excessively long, and in any case doing it in a higher cross section cable would allow you to get further before Zs and Vdrop catch you out.

    Some of these rules of thumb if  quoted without their additional caveats and  applied willy nilly can be misleading. That is probably one of them ?


    T and E in some protection would probably do if the route is on show, but a box beside the indoor socket, and bring SWA into that and work on there, in the dry, would be my personal preferred, but only that, just  a personal house style. My experience of joints outside SWA or anything else, is that they mean trouble, and should be indoors if possible.

    (could look almost like  the photos here)

    Mike.

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