Phase 1IEC

Transformer Sizing Calculator

IEC 60076-1 / IEEE C57 / IS 1180

Select transformer kVA rating considering connected load, demand factor, future growth, altitude and ambient temperature derating. Calculates primary/secondary FLC and recommended fuse ratings.

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Results are for guidance only. All calculations must be verified by a qualified electrical engineer before implementation. Always refer to the applicable local standard and authority having jurisdiction.
Standard:

Load Data

kVA

Ratio of max demand to connected load

%

Typical: 20-25% for industrial

Transformer Data

V
V
m

Derating applied above 1000m (IEC 60076-2)

°C

Derating applied above 40°C

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