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Determining Max Zs For Time Current Curve

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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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