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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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    Don't forget Cmin these days. 411.4.4's requirement is that Zs x Ia ≤ Uo x Cmin.


    Where Ia is the current causing automatic operation of the device in the required time, and for a conventional DNO supply Cmin is 0.95.


       - Andy.
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    Don't forget Cmin these days. 411.4.4's requirement is that Zs x Ia ≤ Uo x Cmin.


    Where Ia is the current causing automatic operation of the device in the required time, and for a conventional DNO supply Cmin is 0.95.


       - Andy.
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