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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
    There is nothing unusual in one incoming cable serving several sets of cut out fuses and meters.

    A "100 amp" cut out indicates that it is suitable for fuses of UP TO 100 amps. It might contain a 100 amp fuse, or might contain a smaller fuse such as 60 amp or 80 amp, or less commonly 40 amp.


    The total fuse ratings often exceed the available capacity, on the grounds that few consumers use the maximum, and that even if a consumer DOES use the maximum, their neighbours hopefully will not.


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  • 0
    There is nothing unusual in one incoming cable serving several sets of cut out fuses and meters.

    A "100 amp" cut out indicates that it is suitable for fuses of UP TO 100 amps. It might contain a 100 amp fuse, or might contain a smaller fuse such as 60 amp or 80 amp, or less commonly 40 amp.


    The total fuse ratings often exceed the available capacity, on the grounds that few consumers use the maximum, and that even if a consumer DOES use the maximum, their neighbours hopefully will not.


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