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Ring Final

With reference to 433.1.204 and cable as installed has min capacity of 20A if protected by a 30A or 32A. If the protective device is reduced to 20A how is the new minimum as installed capacity calculated or arrived at ? I've been looking in the Electrical Installation Design Guide, but the answer is avoiding my eyes.
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  • perspicacious:

    Hello Chris


    This quote I suppose that the overloading could occur in say a commercial kitchen in a restaurant or pub.is Zoom's, hence my italicisation of it!


    Twenty years ago I inspected and tested some 50 or so pubs and couldn't believe that a manufacturer made a twin deep fat fryer each having a 3 kW element and it came with two separate 13 A plugs. These would inevitably be plugged into the nearest double socket-outlet. The manufacturer's logic being that they wouldn't sell any if a dedicated 32 A circuit had to be installed as per the traditional cooker.


    I also learned to only have packeted condiments with a pub meal ...


    Interesting wiring of yours but fairly typical I'm afraid.................


    It was just a general question about rings in commercial kitchens. Yes, there must be 13 A sockets at the very least for small equipment, but radial may be a better option.


    I wonder whether the fryers' installation instructions specified two single 13 A sockets.


    I noticed when I was in Italy once, that those complimentary bowls of nuts in bars always had a teaspoon so that customers kept their fingers out.


    I do not quite see how my wiring could be any different - the CU is where it is and where else would you put the washing machine and tumble drier? Once again, radial may be the better option.


Reply
  • perspicacious:

    Hello Chris


    This quote I suppose that the overloading could occur in say a commercial kitchen in a restaurant or pub.is Zoom's, hence my italicisation of it!


    Twenty years ago I inspected and tested some 50 or so pubs and couldn't believe that a manufacturer made a twin deep fat fryer each having a 3 kW element and it came with two separate 13 A plugs. These would inevitably be plugged into the nearest double socket-outlet. The manufacturer's logic being that they wouldn't sell any if a dedicated 32 A circuit had to be installed as per the traditional cooker.


    I also learned to only have packeted condiments with a pub meal ...


    Interesting wiring of yours but fairly typical I'm afraid.................


    It was just a general question about rings in commercial kitchens. Yes, there must be 13 A sockets at the very least for small equipment, but radial may be a better option.


    I wonder whether the fryers' installation instructions specified two single 13 A sockets.


    I noticed when I was in Italy once, that those complimentary bowls of nuts in bars always had a teaspoon so that customers kept their fingers out.


    I do not quite see how my wiring could be any different - the CU is where it is and where else would you put the washing machine and tumble drier? Once again, radial may be the better option.


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