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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
    Grumpy:

    Why would old storage heaters use a lot more juice than a modern panel heater given that they are both electric and therefore 100% efficient?


    Indeed, you are correct.

    I was thinking more on the lines that a panel heater can be switched off when a particular room is not in use. We anticipate not all rooms to be occupied throughout the day.

    Thus saving power. 

    The problem with storage heaters is you cannot just turn them on and get instant heat.

    I probably need to read up on space heating and what would be more suitable.


    Regards

    Simon.


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  • 0
    Grumpy:

    Why would old storage heaters use a lot more juice than a modern panel heater given that they are both electric and therefore 100% efficient?


    Indeed, you are correct.

    I was thinking more on the lines that a panel heater can be switched off when a particular room is not in use. We anticipate not all rooms to be occupied throughout the day.

    Thus saving power. 

    The problem with storage heaters is you cannot just turn them on and get instant heat.

    I probably need to read up on space heating and what would be more suitable.


    Regards

    Simon.


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