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Estimate minimum box volume using common NEC-style conductor volume allowances.

Estimate conduit fill percentage from conductor outside diameter, quantity and conduit inside diameter.

Estimate a fuse size from load current and continuous-load allowance.

Convert kilowatts to mechanical horsepower.

Convert mechanical horsepower to kilowatts.

Estimate motor current from horsepower, voltage, efficiency and power factor.

Estimate motor full-load current from kW, voltage, efficiency and power factor.

Calculate transformer turns ratio and secondary turns.

Estimate required capacitor-bank kVAr and equivalent delta-connected capacitance.

Estimate reactive power compensation needed to improve power factor.