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Prospective fault current, on the same visitIs 297 the right number to write in the kA box?
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While you’re at the origin, you get the prospective fault current. It’s two readings, and the meter does the arithmetic (Ohm’s law) for you.
- PEFC — prospective earth fault current — comes with the Ze reading: same leads, line to earth.
- PSCC — prospective short-circuit current — probes on line and neutral on the supply side of the main switch. Read the current; ignore the ohms figure.
- Record the higher of the two as Ipf, in kA, on EIC page 2, just above Ze.
Jot it down as you go. A little table on scrap paper — Ze, PEFC, PSCC, and the same three at each sub-board — saves you remembering numbers while you move leads.
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