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17th wiring regs revision Question

Discuss 17th wiring regs revision Question in the Electrical Courses at TilersForums; I will be doing my 2382-10 in the coming weeks, got stuck on a question about fault current, not sure if I have been doing too much revision and my ...

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17th wiring regs revision Question

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I will be doing my 2382-10 in the coming weeks, got stuck on a question about fault current, not sure if I have been doing too much revision and my brain has gone.Anyway question is:The fault current due to an earth fault of negligible impedance in a 400v 3 phase, 4 wire circuit, having an earth fault loop impedance of 0.3 ohms. The choices are: A 1383 AB 767 AC 124.5 AD 72 A B is the given answer , do not understand how the answer has been arrived upon, I am obviously missing a formula, can anybody help?

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