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Electrical Wire and Cable

Short Circuit Current Rating and Fault Level Current

The Correct Method to be used When Testing an Electrical Installation for Earth Loop Impedance: Accurately Measuring the Value of Zs at a Remote End of a Circuit.

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Guide to Testing an Electrical Installation for Earth-Loop-Impedance
Electric Question: Whilst writing, I would appreciate your views on the argument that reducing the value of Ze ie. by say the use of a cpc in parallel with an SWA, will have the reactive result of potentially presenting a higher fault level current (KA) – of course the cpc can always be disconnected if Ze is to high, or of course the prospective short circuit current rating of protective devices could always be increased – given the option(s), what course of action would you take?

Background: Bob, a Contractor from Middlesex, England.

Dave’s Reply:
Thanks for your electrical question Bob. The following information will assist you with Earth Loop Impedance:

Testing for Ze, Zdb and Zs

digital-voltage tester


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One Response to “Short Circuit Current Rating and Fault Level Current”
  1. Sparky john says:

    If you mean the db ze well yes a earth wire in parallel is the answer.