Transformer Sizing Calculator

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Inputs
Result
250kVA

Connected load is 235 kVA. After demand, growth, loading margin, and ambient derating, the required rating is 247 kVA.

Demand load165 kVA
Design load198 kVA
Ambient derate100%
Secondary FLC361 A
Next checks
  • Use secondary current for first-pass breaker, cable, and busbar checks.
  • Confirm transformer standard series, impedance, cooling class, harmonics, inrush, and local code before procurement.
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