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Supply options for hot food counter installation

hertzal123

I have been asked to wire a set of 4 hot counters ,each comprising a heated cupboard,,heated well and heat lamps on a gantry over each unit.

The units are all joined together and are fed from a built in 3 phase board.All elements and stats to be fitted in the workshop.

I can see 2 possible ways to wire this.

A:Fit 3 mcbs in each unit and run 1 cable back to mcb board,4 cables in total.Disadvantage,mcb in board in series with mcbs in each unit.

B:Run 3 cables to each unit supplied from mcb board(with suitable warning labels)No mcbs inside units,but 12 cables/circuits required.

Thought that option B was the correct procedure but would welcome any advice.

                                                                                              Regards,

                                                                                                     Hz

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  • 0
    hertzal123 said:
    fed from a built in 3 phase board

    Not sure that I get this. If the board is built in, why not have one circuit per heater?

    I don't have a problem with MCBs in series. From the sound of it, overload cannot occur, so they are for fault protection only. A fault should be a very rare occurrence and would it really matter if the upstream MCB had to be re-closed?

  • 0 in reply to Chris Pearson

    The big problem with those things is that they are on for a long time, get hot and may well all come on at once so the de-rating of adjacent MCBs should apply and too much diversity may not be wise

    I'm assuming that each counter is sized for manning by a single person so is 16-20A each (that can be split between the phases or ganged onto one ) and if they are 3 phase or not the controls on each one them allow selection of  the upper/lower heat etc If they are the kind where the heat from below can be a water bath, then the elements can be the kind that trip RCDs so not too many on one final circuit.

    Quite often you see them plugged in in via single or 3 phase BS4343 style sockets depending on the variant, to allow isolation and  pulling out to clean under or behind.

    Mike

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  • 0 in reply to Chris Pearson

    The big problem with those things is that they are on for a long time, get hot and may well all come on at once so the de-rating of adjacent MCBs should apply and too much diversity may not be wise

    I'm assuming that each counter is sized for manning by a single person so is 16-20A each (that can be split between the phases or ganged onto one ) and if they are 3 phase or not the controls on each one them allow selection of  the upper/lower heat etc If they are the kind where the heat from below can be a water bath, then the elements can be the kind that trip RCDs so not too many on one final circuit.

    Quite often you see them plugged in in via single or 3 phase BS4343 style sockets depending on the variant, to allow isolation and  pulling out to clean under or behind.

    Mike

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