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Spur of a boiler supply

Discussion in 'Electricians' Talk' started by deanno, Jan 2, 2021 at 10:09 AM.

  1. deanno 日本小朋友的性教育课日本小朋友的性教育课,三姨今晚让你拥个够三姨今晚让你拥个够

    deanno New Member

    The FCU is the only supply on 1 kitchen wall and I wish to add 2 double sockets for a washing machine and dishwasher, also for 2 lights. There is no separate mcb for the boiler. There is only 1 line in and then 1 to the boiler. Could I spur of the line in and add as per my diagram.

    Attached Files:

  2. nigel willson

    nigel willson Screwfix Select

    Insufficient info I’m afraid. Need to know how all wiring is connected, ring or radial, size of MCB feeding this setup
  3. deanno

    deanno New Member

    32a MCB and there is only 1 supply cable coming into the boiler FCU. There is no separate MCB for this, its on the the downstairs socket MCB
  4. Dave_C

    Dave_C New Member

    According to this page:


    both a dishwasher and washing machine can draw up to 10 amps each, so I wouldn't be comfortable putting them both (plus the boiler and lights) on a 13A fuse. In practice it might be OK, but there is always a chance they will try to draw their maximum current simultaneously.

    Also, your diagram is putting the 5A FCU first. You would need a 13A FCU first (i.e. connected to the downstairs sockets), and then the sockets and two 5A FCUs (one for the boiler, one for the lights) connected to the load side of that first FCU.

    Personally (but I am only DIY) I would try and trace where the boiler FCU connects to your downstairs sockets circuit and try and pull through a second cable to extend the ring (assuming it's a ring). Is it on an interior wall, perhaps with sockets on the other side? Which direction does the cable going into the FCU come from?
  5. Bazza

    Bazza Screwfix Select

    If I understand your outline properly, you have an FCU that is already a spur from a ring final. (The one that feeds the boiler).

    You can’t spur off that. There’s no point having a 5A FCU feeding all the rest of it!

    You could change that FCU fuse to 13A. On the load side you could connect your sockets and another FCU for the boiler. But you’ll be limited to 13A, and that’s not going to be enough for WM+DW even before you add boiler and lights!!
    You need to rethink snd find a way to extend a ring final, or bring a whole new circuit in.

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