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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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    UKPN:

     An industrial unit from the 1960s, hence the TPN 150 amp service .It then seems in later years this became a collection of offices hence the multi cut outs. 

    Are the (12) meters still installed? 

    If there are to be that number of "units" and depending on the maximum power requirement, the ideal and cost effective solution may be to upgrade the existing cut outs and most likely upgrade the incomer, (which would be a minimum of 200 amp) I note the tails are insulated and sheathed, so modern.

    It appears there is a satisfactory Ze. 

    The space heating seems to be a general installation so likely to be part of a landlords supply.


    This project depends on as always, the maximum power reqd. This will be declared to the DNO and they will take it from there. 

    If the required load exceeds the available capacity, as a starter a new cable will be need to be laid. Depending on condition, they may require a Ryefield. The consumers switchgear may need to be renewed. 

    Earthing and bonding will almost certainly need upgrading to (TNS) new standards. 


    Pretty straight forward really. Good luck with that.

    Regards, UKPNZap

     


    Thank you, again invaluable information.

    I may have more questions, forgive me.


    Regards

    Simon


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  • 0
    UKPN:

     An industrial unit from the 1960s, hence the TPN 150 amp service .It then seems in later years this became a collection of offices hence the multi cut outs. 

    Are the (12) meters still installed? 

    If there are to be that number of "units" and depending on the maximum power requirement, the ideal and cost effective solution may be to upgrade the existing cut outs and most likely upgrade the incomer, (which would be a minimum of 200 amp) I note the tails are insulated and sheathed, so modern.

    It appears there is a satisfactory Ze. 

    The space heating seems to be a general installation so likely to be part of a landlords supply.


    This project depends on as always, the maximum power reqd. This will be declared to the DNO and they will take it from there. 

    If the required load exceeds the available capacity, as a starter a new cable will be need to be laid. Depending on condition, they may require a Ryefield. The consumers switchgear may need to be renewed. 

    Earthing and bonding will almost certainly need upgrading to (TNS) new standards. 


    Pretty straight forward really. Good luck with that.

    Regards, UKPNZap

     


    Thank you, again invaluable information.

    I may have more questions, forgive me.


    Regards

    Simon


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