LV Transformers

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Frequently Asked Questions

FA101694 - How to Calculate the Required Capacity kVA Rating or Amperage Capacity for Single and Three Phase Transformers

FA105006 - How do you calculate the maximum possible Available Fault Current at the secondary of a Transformer?

FA101887 - What is the difference between a Transformer's "temperature rise" and its "insulation class"?

FA120629 - What is the standard sound level (in dB) of Transformers of various kVA ratings?

FA101784 - What is the difference between Sealed Resin Epoxy Encapsulated Transformers and Ventilated Transformers that otherwise have similar parameters (kVA, voltage)?

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Section 14 - Transformers

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Minimum data needed to select a transformer

Load voltage(secondary voltage)
Load requirement(load always determines phase of transformer)	Three-phase (three wire or four wire) Single-phase (two wire or three wire)
Load Current(use table to convert to kVA or formula)	Single Phase formula: Volts x Current = VA Three Phase formula: Volts x Current x 1.73 = VA Convert VA to kVA by dividing by 1000
System voltage and frequency(primary voltage)
Mounting Location