Prospective Fault Current

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Couleddie

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Just going through the questions on my 17th edition coursework. This one is driving me nuts. Must have researched this for hours but still can't work out how to get the answer:

The prospective fault current at the supply terminals of a TNCS system with maximum external earth loop impedance is:

A Approx 760 Amps

B Approx 660 Amps

C Approx 560 Amps

D Aprox 460 Amps

I don't particularly want the answer, just how to work it out.

 
PFC = Uo/Ze = 230/0.35 = 657.14A

Approximately 660A or 0.660kA

 
Assuming that it is a 230V Single-Phase supply. :)

 
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