Controls Energy

Three-phase Lighting Load Balance Calculator

Estimate phase currents and load imbalance from entered three-phase lighting watts.

Lighting calculator Controls Energy Updated August 26, 2026

Inputs

Results

Total load -- W
Phase A current -- A
Phase B current -- A
Phase C current -- A
Calculation details
Total load
-- W
Phase A current
-- A
Phase B current
-- A
Phase C current
-- A
Average phase current
-- A
Current imbalance
-- %
Balanced within entered threshold
--
Important notes
  • Use actual circuit grouping, product wattage, measured power factor, neutral loading, protective device data, and design constraints.
  • This calculator provides planning support only and is not an installation approval or certification.

Formulas

  • \(\displaystyle I_{\mathrm{phase}} = P_{\mathrm{phase}} / (V_{\mathrm{LN}} \times PF)\)
  • \(\displaystyle I_{\mathrm{avg}} = (I_A + I_B + I_C) / 3\)
  • \(\displaystyle \mathrm{imbalance}_{\%} = (I_{\max} - I_{\min}) / I_{\mathrm{avg}} \times 100\)

Estimate phase currents and load imbalance from entered three-phase lighting watts.

Three-phase Lighting Load Balance Calculator is a planning aid. Keep the target source, product data, measurement method, and project assumptions with the result. Confirm compliance, installation, certification, and safety decisions with the responsible professional.