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High PFC issues

Former Community Member
Former Community Member

Hi all,

First post coming in…

I have a installation that we have been asked to Test, I conducted the usual tests for the Ze & Pfc.  I got 0.4 ohms & 11.7kA respectively.  Its a commercial block and the transformer is behind a locked door about 20m away, so probably reasonable to assume it’s accurate.  So here is my question given the absence of 15kA RCBO’s and the rarity 15kA MCB’s, what are my options?

Thanks in advance.

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    Even if the Ze is a typo for 0.04 ohms, the figures still do not correspond.

    AFAIK, testers measure EFLI. They then do the sums using Ohm's law. 230/0.04 = 5750. Assuming a 3-phase supply and PEFC ≈ PSSC, if you use the rule of thumb of doubling the single phase PSSC, that does give 11.5 kA.

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  • 0

    Even if the Ze is a typo for 0.04 ohms, the figures still do not correspond.

    AFAIK, testers measure EFLI. They then do the sums using Ohm's law. 230/0.04 = 5750. Assuming a 3-phase supply and PEFC ≈ PSSC, if you use the rule of thumb of doubling the single phase PSSC, that does give 11.5 kA.

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