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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
    But could the incomer in question be a fused neutral?

    I doubt they ever put a fused N on a 3-phase system - too much risk of frying loads with 415V L-N. AFAIK even in the old days N was only fused after the transition to '2-wire' circuits.


       - Andy.
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  • 0
    But could the incomer in question be a fused neutral?

    I doubt they ever put a fused N on a 3-phase system - too much risk of frying loads with 415V L-N. AFAIK even in the old days N was only fused after the transition to '2-wire' circuits.


       - Andy.
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