Transformer kVA Chart
A transformer kVA chart is useful only after the load kVA and design margin are known. The calculator computes those values and rounds to a standard rating family.
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Single-phase kVA
kVA = V * I / 1000
Three-phase kVA
kVA = sqrt(3) * V_LL * I / 1000
After the chart
After selecting a kVA size, check full-load current, voltage drop, conductor/raceway fill, grounding and available fault current.
Related pages
- Transformer kVA calculator - load kVA, design margin and standard size rounding.
- Conduit fill calculator - raceway fill from conductor count, area and conduit size.
- Voltage drop calculator - feeder voltage drop and conductor-size screening.
- Short-circuit current calculator - available fault current from transformer impedance.