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High PFC

Pete Murphy
Hello,
I’m looking for help interpreting readings at a single-phase domestic CU, TNC-S. V= 241.6
Ze = 0.06Ω, main switch open, main earth disconnected.
I’ve taken the PFC readings twice now.
  1. PEFC = 2.2kA, PSC =4.0kA

  • PEFC = 2.7kA, PSC =6.0kA

These readings were from the supply side of the closed main switch with main and supp. earth connected. I took one set of PSC readings direct from the (6kA) RCBO’s of which the highest was 5.9kA.
Seems a large difference for a combined earth and neutral.
Main fuse is BS1361 type 2 so no problems there but before I spend £300 plus for 10kA breakers am I missing something here?
Thanks for any comments,

Pete

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  • 0
    Hello Chris,

    Yes, 2 lead tests for all but as you say the arithmetic doesn't tally. I'm back in the (empty) apartment on Wednesday so time to do it again. It's a city centre not far from the transformer so the low Ze/high PFC makes sense but not the rest of it.

    Just thought, the meter's been recently calibrated so I'll check it against my known readings at home.

    Thanks for your time,

    Pete
Reply
  • 0
    Hello Chris,

    Yes, 2 lead tests for all but as you say the arithmetic doesn't tally. I'm back in the (empty) apartment on Wednesday so time to do it again. It's a city centre not far from the transformer so the low Ze/high PFC makes sense but not the rest of it.

    Just thought, the meter's been recently calibrated so I'll check it against my known readings at home.

    Thanks for your time,

    Pete
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