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PFC, PEFC and PSCC explained

PFC is a general fault-current term. PEFC and PSCC describe earth-fault and short-circuit fault-current checks.

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Quick answer

PFC is a general fault-current term. PEFC and PSCC describe earth-fault and short-circuit fault-current checks.

How to do it

  1. PEFC relates to a line-to-earth fault path.
  2. PSCC relates to a line-to-neutral or line-to-line short circuit path.
  3. The highest relevant value is commonly used for protective device suitability.
  4. Use the calculator for simple estimates and record your assumptions.

Worked example

230 V ÷ 0.35 Ω = 657 A, or 0.66 kA.

Common mistakes

  • Using an assumed Ze without checking.
  • Confusing PSCC, PEFC and the highest prospective fault current.
  • Recording an estimate where a measured value is required.

When this is not suitable

Do not use this instead of proper testing, standards, competent judgement or safety-critical design checks.

Related next tools

Next useful power and electrical tools for this check.

ElectricalEarth Fault Loop Impedance CalculatorEstimate Zs from Ze and R1+R2, compare against a max Zs value, and show fault current. ElectricalR1+R2 CalculatorWork out R1+R2 from measured Zs and Ze, with simple support values for certificates and notes. ElectricalBasic Voltage Drop CalculatorQuick voltage drop estimate from current, length, supply voltage and resistance per metre.

Keep the result together

Use the calculator first, then add the result to a Project Sheet if you need a clean printable summary.

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