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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
    Our total floor area to be heated is 950 m2. This works out at about  390A! This does not leave us with much left.


    So it looks lke we are going to need more power to the building.


    Thoughts?


    Regards

    ​​​​​​​Simon
Reply
  • 0
    Our total floor area to be heated is 950 m2. This works out at about  390A! This does not leave us with much left.


    So it looks lke we are going to need more power to the building.


    Thoughts?


    Regards

    ​​​​​​​Simon
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