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Single wall socket connected to two Mini Circuit Breakers.

Discussion in 'Electrics UK' started by Daniel Keenan, 18 Aug 2020.

  1. Taylortwocities

    Taylortwocities

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    At the time of installation it would have proved that wires 1&2 were the ends of ring 1. And that wires 3&4 were the ends of ring 2. He may have done this test but he mixed them up when he fitted the ends to the MCBs.
    It doesn’t reveal an interconnected ring later on.
     
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  3. Taylortwocities

    Taylortwocities

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    Yes, it is. It’s a spur, same as any other. Except the connection has been made at the MCB not at a socket. Perfectly normal.

    But, like any spur, you can only have one socket, not two or three on the one spur.
     
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  4. EFLImpudence

    EFLImpudence

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    Yes, it is protected by the fuses in the plugs - 2 x 13A = 26A - which is why only one double socket is allowed on the unfused spur.

    Just to confuse matters, although two single sockets would be the same, some say certain words in the regulations prohibit two singles.
    Electrically it would be fine.

    You can always use 4mm² cable for the unfused spur then have more sockets.
     
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  5. gman76

    gman76

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    Of course - thanks TTC. Bit of a brain fart this evening! Not being an electrician, I don't live & breath this stuff every day!
    Thanks for clearing that up.
    Luckily, I don't think the OP wants to spur from the added socket, so FCU issue averted.
    Thanks too to EFLI.
     
  6. Daniel Keenan

    Daniel Keenan

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    Thanks TCC, I understand all of this. I just want to add another socket directly to the ring from a socket that is not from a spur but was originally built with the house. That's perfectly fine isn't it?.
     
  7. Daniel Keenan

    Daniel Keenan

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    Can you add 4mm² cable to an already existing 2.5mm² final ring circuit? Does this not overload the 2.5mm² or does the circuit compensate by distributing the load evenly on both sides of the spur (which are using the 2.5mm²)?
     
  8. Taylortwocities

    Taylortwocities

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    Yes, if it is on the ring itself and not already a spur.
     
  9. Taylortwocities

    Taylortwocities

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    Really? I don’t think so.
     
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  11. EFLImpudence

    EFLImpudence

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    Yes.

    No. Not per se.

    Only evenly if in the centre of the ring - but
    27A is so near 32A that enough to overload it would have to be very near one end.

    Plus, of course, there could be two or more 2.5mm² spurs close together so the fact that one might be 4mm² does not raise any separate concerns.
     
  12. Taylortwocities

    Taylortwocities

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    Have I misunderstood this
    To me, this says that (in your opinion) you can connect a bit of 4mm² cable as a spur to a 32A protected 2.5mm² ring final. then string 5 double 13A sockets on the end of the 4mm² Cable??

    Is that what you mean?
     
  13. EFLImpudence

    EFLImpudence

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    Yes, with the already mentioned proviso that it is not too near one end that it would cause a problem - as would 5 separate spurs.
     
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  14. Taylortwocities

    Taylortwocities

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    Not according to app 15. If what you have stated is allowed then we can all connect 4mm SWA to ring finals, run it down our gardens and put consumer units on the end.
     
  15. EFLImpudence

    EFLImpudence

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    Appendix 15 is only informative and not exhaustive.

    If 32A is enough for the garden circuit, then why not? Why would you mention a consumer unit?
     
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  16. EFLImpudence

    EFLImpudence

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    Tell us why Appendix 15 apparently 'prohibits' two single sockets on a 2.5mm² unfused spur.
     
  17. sparkwright

    sparkwright

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    This is fine, if the 4mm2 is connected to a socket or joint DIRECTLY on the ring (ie not a spur), and the cable to the new 5 sockets would have to be in 4mm2 (though the very last one could be 2.5mm2.

    I also don't see a problem spurring in 4mm2, then forming an additional little ring from there onwards in 2.5mm2.


    Not that I would do much of this in reality - makes the testing a pain for a start.
     
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