2 feeds off 60amp for Kitchen

Discussion in 'Electricians' Talk' started by Kiev, Sep 15, 2020.

  1. Kiev

    Kiev New Member

    Hello,

    Can I have some advice please?

    I'm replacing a big old ****-off Rangemaster oven, which runs off it's own 60amp feed, with the following:

    2 x 3.6 kw Ovens
    1 x 7.4 Induction hob

    All 3 items need to be hardwired. At the moment, there is a nice big rotary isolator in between the 60amp box and the cooker.

    My questions is:

    Can I simply put in a junction box after the isolator and split the feed to 3 Cooker Outlet Plates - 1 double for the 2 ovens and 1 single for the hob?

    Thanks
     
  2. nigel willson

    nigel willson Screwfix Select

    Would say no. Cables feeding said appliances would require 16mm cable . Put in small consumer unit fuse down ect ect
     
    Kiev likes this.
  3. spirits are real 2016

    spirits are real 2016 Screwfix Select

    What size is the cable supplying the range at the moment..
     
    Kiev likes this.
  4. Kiev

    Kiev New Member

    Big.

    Given the size of the cable insulation, I would assume it's 16mm
     
  5. unphased

    unphased Screwfix Select

    My thoughts are, as its such a hefty supply, and you have a decent size cable, you can very easily run all three appliances off the circuit. You would struggle to find a junction box rated at 60A so my suggestion would be to install a dual cooker outlet plate and connect that to the 16mm2 T&E and then wire off that in 6mm2 T&E to a single cooker outlet next to it. Wire the two ovens off the dual outlet and the hob off the single.
     
    Kiev likes this.
  6. Kiev

    Kiev New Member

  7. Bazza

    Bazza Screwfix Select

    Kiev likes this.
  8. Coloumb

    Coloumb Screwfix Select

    I'm not convinced 6mm on a 60a fuse is workable. 2.5mm cpc size will most likely be too small.
     
  9. unphased

    unphased Screwfix Select

    Fixed load situation, Ben. It's probably the physical connection of 3 x 6 in the terminal that will be a challenge.
     
    Last edited: Sep 16, 2020
  10. Coloumb

    Coloumb Screwfix Select

    It's not the load current it's the fault current.
     
  11. unphased

    unphased Screwfix Select

    Fault current will be the same irrespective of the cable size. Its more an overload problem. The cable won't overload because the load is fixed. Short-circuit would easily pop the 60A breaker.
     
    sparko69 likes this.
  12. Coloumb

    Coloumb Screwfix Select

    The short ctt. will for sure pop the breaker but the let through energy of a 60 a breaker, I would imagine, would be more than the 2.5mm cpc is designed for.
     
  13. unphased

    unphased Screwfix Select

    That's a fair point. I wouldn't know for sure without doing calcs.
     
  14. metrokitchens

    metrokitchens Screwfix Select

    Henley blocks and use singles all 6mm in trunking?
    Just a ‘kitchen fitters’ thoughts.
     
  15. unphased

    unphased Screwfix Select

    Hmm, not a bad idea metro.
     
  16. metrokitchens

    metrokitchens Screwfix Select

    Cheers. When the cables are bigger than the pipes I ain’t gonna touch it :)
     
  17. Bazza

    Bazza Screwfix Select

    Henley block is designed for “double insulated” cables like meter tails.

    We don’t know what sort of cable is envisaged. You cannot connect T&E to a Henley block in a compliant way, because the outer sheath must be inside the enclosure where the joint is made.
     
  18. unphased

    unphased Screwfix Select

    Good point Bazza. Didn't think that through. :rolleyes:
     
  19. metrokitchens

    metrokitchens Screwfix Select

    I did consider that issue hence the trunking idea. Perhaps put the Henley blocks in an enclosure..
    Or just use three of the metal connector blocks, often used for main bonding, fixed in an adaptable box.
    16mm in one entry and three sets of 6mm singles exiting via round conduit.
     
    Last edited: Sep 16, 2020
  20. unphased

    unphased Screwfix Select

    Or maybe enclose the Henley inside a box? Take the cables in through glands. It could be designed with thought.
     

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