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Old incomer connected to four 3 phase cutouts help

Simon M
Hi all,


I have a very old incomer entering the building that then feeds to 4 x 3ph cutouts. You can see two of the 3ph cutouts in the pic.
9f8642aebed8db60e40f7a2578ffd3a3-original-02.jpg


The incomer says on it  - BI Callender's - 4E 150 x 3. I assume this means 3 x 150 Amps? Please do correct me if I am wrong.


1. What is the maximum power I can draw from this system?


2. If each of the 4 Three phase cutouts were loaded with 100 Amp fuses and I was to pull close to that from each fuse. what would happen to the incomer as this would equate to 1200 Amps!


3. Is connecting 4 3ph cutouts to this old beast a reasonable thing to do? Or is it ridiculous?


Many thanks

Simon
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  • 0
    A total of 150 amps per phase MIGHT suffice for electric heating or might not.

    What is the floor area to be heated ? how well insulated is it ? And as has already been said is electricity to be included in the rent or service charge or will it be metered.

    If not metered, then expect very liberal use.


    Panel heaters vary a lot in loading, but about 8 to 10 amps is common. So allowing for other loads, you should be ok for about ten or a dozen heaters on each phase.

    What about water heating ? Are any showers to be fitted ? Any energy intensive processes likely, table top pottery kilns, or any electrically powered catering to be allowed.

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  • 0
    A total of 150 amps per phase MIGHT suffice for electric heating or might not.

    What is the floor area to be heated ? how well insulated is it ? And as has already been said is electricity to be included in the rent or service charge or will it be metered.

    If not metered, then expect very liberal use.


    Panel heaters vary a lot in loading, but about 8 to 10 amps is common. So allowing for other loads, you should be ok for about ten or a dozen heaters on each phase.

    What about water heating ? Are any showers to be fitted ? Any energy intensive processes likely, table top pottery kilns, or any electrically powered catering to be allowed.

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