3-Phase Power Formula

W = V × A × √3

V = Voltage, A = Amperage, √3 = 1.732 (phase constant).

The 80% NEC Rule

For continuous loads like servers, the NEC requires you never exceed 80% of a circuit's rated capacity. This is code — not optional.

Three-Phase Power

Three-phase uses three alternating currents offset by 120 degrees, providing more stable power and higher density than single-phase at the same amperage.

Per-Phase Breakdown

Each phase leg in a balanced 3-phase system carries approximately one-third of total load — critical for PDU branch circuit planning.

Results are estimates. Verify against vendor specs before deployment. Full disclaimer

Power Phase & PDU Calculator

Size PDU circuits and calculate NEC 80% safe load derating.

Input Voltage (V)

Circuit Amperage (A)

Phase Type

Total Apparent Power

Safe Load (80% Derated)
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