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Three-Phase Load Balance Calculator

Compare three measured or scheduled phase currents and show total, average, extremes, spread and peak deviation. It does not judge installation compliance.

Inputs

Phase currents

Range: 0–100,000 A

Enter RMS line current for L1 from a load schedule or measurement. Use the same operating condition and current basis for all three phases.

Range: 0–100,000 A

Enter RMS line current for L2 using the same operating condition as L1 and L3.

Range: 0–100,000 A

Enter RMS line current for L3 using the same operating condition as L1 and L2.

Result

Average phase current (A)
20.00
Maximum deviation from average (%)
0.00
Maximum deviation from average (A)
0.00
Highest phase current (A)
20.00
Lowest phase current (A)
20.00
Highest-to-lowest spread (A)
0.00
Sum of phase currents (A)
60.00

Formula

Calculation logic

Formula definitions and substituted values.

Before relying on the result

  • Compare phase currents after adding loads
  • Quantify current imbalance from a known phase schedule
  • Use the spread as a planning signal when reviewing the user-entered phase allocation.

Related calculators

Use the spread as a planning signal when reviewing the user-entered phase allocation.