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Determining Max Zs For Time Current Curve

Former Community Member
Former Community Member
How do you determine the max Zs when the manufacturer does not list or specify the maximum permitted earth fault loop impedance? TN system.


https://library.industrialsolutions.abb.com/publibrary/checkout/GES-6119D?TNR=Time%20Current%20Curves%7CGES-6119D%7CPDF&filename=GES6119.pdf
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    Note that the figures in the BS are far too pessimistic. Real maker's data is often an order of magnitude quicker - so the apparent let-through energy is not as high as BS7671 suggests, and reduced CPC T and E is OK after all. Whew..

    Mike
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    Note that the figures in the BS are far too pessimistic. Real maker's data is often an order of magnitude quicker - so the apparent let-through energy is not as high as BS7671 suggests, and reduced CPC T and E is OK after all. Whew..

    Mike
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