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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
    Only the owner can see the google drive image you are linking to - you presumably are logged into your google account and can see it. Sadly we can't...


    You can upload files to the forum server and then we can all see them.  In the composing post window, it is the button next to the smily face that looks like a temperature chart that allows you to upload an image, or the paper clip that allows you to attach a local file.


    It may well be 3* 150amp fuses in the cut-out but it is an odd number, but then BI go back to the days of rewireable service fuses, and fused neutrals, so anything is possible. If it was new 150mm2 cable size comes to mind, but this will be well and truly pre-metric I assume.


    Lets see it, and the size of the incoming cable. (but in flats it is quite common to see several flats each with 60A or 80A fuse, on a 100A incomer... normally without issues.)

    mike.

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  • 0
    Only the owner can see the google drive image you are linking to - you presumably are logged into your google account and can see it. Sadly we can't...


    You can upload files to the forum server and then we can all see them.  In the composing post window, it is the button next to the smily face that looks like a temperature chart that allows you to upload an image, or the paper clip that allows you to attach a local file.


    It may well be 3* 150amp fuses in the cut-out but it is an odd number, but then BI go back to the days of rewireable service fuses, and fused neutrals, so anything is possible. If it was new 150mm2 cable size comes to mind, but this will be well and truly pre-metric I assume.


    Lets see it, and the size of the incoming cable. (but in flats it is quite common to see several flats each with 60A or 80A fuse, on a 100A incomer... normally without issues.)

    mike.

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