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Earth Fault Loop Impedance with Safety Generator

Former Community Member
Former Community Member
Do I take this into consideration? If so how do I size wire in a building with a safety generator? What is my "Ze" when the supply switches from DNO to the safety generator? How do diesel generators behave during faults?


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  • Former Community Member
    0 Former Community Member
    I needed that rule of thumb! 10% sounds reasonable, or if you can get an instant pickup value around the gen's 5 cycle L-E value.


    Correct me if I'm wrong, but for an L-E fault, a generator will output 1000% of the FLC for a few cycles before dropping. Is there any truth to this?
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  • Former Community Member
    0 Former Community Member
    I needed that rule of thumb! 10% sounds reasonable, or if you can get an instant pickup value around the gen's 5 cycle L-E value.


    Correct me if I'm wrong, but for an L-E fault, a generator will output 1000% of the FLC for a few cycles before dropping. Is there any truth to this?
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