Use the following information as a handy reference when selecting and applying dry type transformers within your environment.

Minimum data needed to select a transformer:

Minimum data needed to select a transformer:

• Load voltage (secondary voltage)
• Load requirement
• Three-phase (three wire or four wire)
• Single-phase (two wire or three wire)
• (load always determines phase of transformer)
• Load current (use table to convert to kVA or formula)
• Single-phase formula: Volts x Current = VA
• Three-phase formula: Volts x Current x ?3
• System voltage and frequency (primary voltage)
• Mounting location

Specific applications:

• Feeding distribution panel
• Feeding distribution panel with harmonic content
• Non-linear energy efficient transformer
• Feeding multiple distribution panels with harmonic content
• Harmonic mitigation energy efficient transformers
• Small change in voltage