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Uk regs issue

  • 12-12-2012 12:38pm
    #1
    Registered Users, Registered Users 2 Posts: 9,760 ✭✭✭


    I'm doing a bit of work in London in my sister in laws house thats being renovated. Builders seem like cowboys as do the electricians. I know things might be done different here but some stuff just seems dodgy. What's concerning me at the moment is the cooker circuit. It's wired from the mcb to the cooker switch in two 2.5 sq cables rather than one 6 sq. Does anyone know if this is acceptable practice over here? Seems to me like the electrician had no 6 sq and did this instead. Its something Ive ever seen at home.


Comments

  • Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,641 Mod ✭✭✭✭2011


    What size is the load?
    What size is the protective device?


  • Registered Users, Registered Users 2 Posts: 9,760 ✭✭✭Effects


    32A breaker. Not sure of the load yet but it's a big induction hob going in. Worried that the 2.5 might also be feeding other stuff too. Surely if one cable gets damaged then it's left with one 2.5 on a 32amp mcb.
    Already found loads of Loose connections on stuff.


  • Registered Users, Registered Users 2 Posts: 9,760 ✭✭✭Effects


    The load is 31.3A 7.2Kw for hob and 14.3A 3.3 kw for oven. Doesn't sound good to me.


  • Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,641 Mod ✭✭✭✭2011


    A 32A MCB will not provide adequate protection for a 2.5 T+ E.

    As a short term solution you could change the MCB for a 20A B type and see if it trips. At least the cable would be protected.


  • Registered Users, Registered Users 2 Posts: 378 ✭✭frankmul


    There is a rule that that you can't parallel below 10sq in the irish rules 555.1.3 but I can't see and equivalent one in he English rules.


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  • Registered Users, Registered Users 2 Posts: 9,760 ✭✭✭Effects


    It's 2 x 2.5 cables in parallel.
    Do I replace the two 2.5 sq with two 6 sq and two 32amp MCB for oven and hob or one 10sq with 40a MCB taking diversity into consideration?


  • Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,641 Mod ✭✭✭✭2011


    Effects wrote: »
    It's 2 x 2.5 cables in parallel.
    A 32A MCB is/was permitted on a ring socket circuit. I was never a fan of this, but in the UK they seemed to love it. At least it would seem that the cables may be protected. Carry put a little investigation.

    Personally I would wire a hob such as that on at least a 6sq. T+E


  • Registered Users, Registered Users 2 Posts: 9,760 ✭✭✭Effects


    Thanks guys. Really looks like some cowboy electrician ****'s going on.


  • Closed Accounts Posts: 4,431 ✭✭✭M cebee


    2011 wrote: »
    A 32A MCB is/was permitted on a ring socket circuit. I was never a fan of this, but in the UK they seemed to love it. At least it would seem that the cables may be protected. Carry put a little investigation.

    Personally I would wire a hob such as that on at least a 6sq. T+E
    the ring cct seems to be a general exception
    i would hazard a guess it's not allowed
    in bs7671 either


  • Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,641 Mod ✭✭✭✭2011


    M cebee wrote: »
    i would hazard a guess it's not allowed
    in bs7671 either

    I would think you are correct.

    As I said, I would wire this in at least a 6sq. T+E


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  • Registered Users, Registered Users 2 Posts: 378 ✭✭frankmul


    It looks like there is no rule preventing it in the English rule, it is just classified a bad workmanship.
    I'd go for 6sq too


  • Closed Accounts Posts: 4,431 ✭✭✭M cebee


    if there's dedicated 2.5's already fitted, maybe use one for the oven and a new 6sq for hob.
    -if they're separate appliances

    daft if paralleling 2.5's is allowed in uk


  • Registered Users, Registered Users 2 Posts: 9,760 ✭✭✭Effects


    Ended up running the 6sq for the hob and left the paralleled 2.5sq for the oven. Thanks for the help. Seems they do a few things differently in the UK.


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