Production tools

Power calculators

Ohm's law · Line loss · Three-phase load balancing · Circuit Breaker game ↗

Solve for any value — fill in two, get the third

Result

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W = A × V  ·  A = W ÷ V  ·  V = W ÷ A

Estimate voltage drop and power loss over a cable run

Voltage drop

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Voltage at load

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Power lost in cable

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NEC copper resistance values. Single-phase AC. Round-trip length used for calculation.

Enter load in amps for each circuit — assign to a phase

Circuit / load Amps Phase

Phase totals

0A

Phase A

0A

Phase B

0A

Phase C

A
B
C

Balance status

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Total load

—

Max imbalance

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Imbalance under 10% is generally acceptable. Over 20% risks overloading a single phase and tripping breakers. Neutral carries the imbalance current.