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Transformer sizing calculator

Compare primary and secondary full-load current, review the supported NEC maximum overcurrent protection, and carry phase and ground conductor groups into a raceway fill check.

Transformer inputs

Nameplate and protection

Enter rated kVA and winding voltages. Select the protection arrangement used for the Table 450.5(B) limit.

The displayed values are maximum permitted ratings or settings, not a required device selection.

Results

Calculate to size both windings.

Full-load current, Table 450.5(B) overcurrent limits, copper conductors, and equipment grounds will appear here when the inputs are valid and within the supported scope.