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150A Ring Final Circuit

Neil Annetts

I am after some help in calculating the curent carrying capacity of a ring final circuit wired in 16mm Tri rated singles!

From the book 16mm tri rated will take 100A. circuit no more than 10 meters long, all in steel trunking / DB enclosures etc.

Supplied from a Schnieder NSX160F with a 100 - 160A TMD unit.

I know there is a way of calculating this but for the life of me i cannot remember how to do it and no amount of Googling is being productive!

Some background on the reason - 8-row schneider Prisma panel with 6x 80A Multiclip bus bars. cannot wire each back seperatley without having 6 cables per phase at the MCCB so the thought was to wire a ring around the lot.

Any help would be greatly appreciated

 

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    In general, I would say that given some diversity in the busbar loadings you are on fairly safe ground. With 160 A maximum load overall and 100A cable the only way you could overload it would probably be to load the 2 bars very close to one end at 80A each and then nothing on the rest. To work this out you need the exact cable lengths and loadings, then a fairly simple network problem, but there is not a generic solution. If you are stuck send me the details and I will give you a calculation.

    Regards

    David

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  • 0

    In general, I would say that given some diversity in the busbar loadings you are on fairly safe ground. With 160 A maximum load overall and 100A cable the only way you could overload it would probably be to load the 2 bars very close to one end at 80A each and then nothing on the rest. To work this out you need the exact cable lengths and loadings, then a fairly simple network problem, but there is not a generic solution. If you are stuck send me the details and I will give you a calculation.

    Regards

    David

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