Frequently Asked Questions

This section is for informational purposes only and should not be used as a design tool or to generate technical specifications. For further details, please contact CTI and discuss with a representative for clarification. Search for terms or questions by entering words or phrases in the text box and clicking Search, by selecting a category from the drop-down list and clicking Show. Then simply click on the linked term or question below.

View All Transformer Terms

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Question: What is needed when specifying a transformer?

Answer: •Single or three phase •Primary voltage(s) and connection (e.g., delta) •Secondary voltage(s) and connection (e.g., wye) •KVA rating (if known) •Frequency (e.g., 60 Hz or 50/60 Hz) •Duty cycle (if known) •Heat rise (limitations, if any, are important) •Insulation class (e.g. class "H") •Primary(ies) amperage (if known) •Secondary(ies) amperage (a must) •Transformer use and type (application description) •No-load voltage •Percent regulation •Percent impedance •Dimensional restrictions (if any) •Watts loss (if known) and limitations (if any) •Terminal style (e.g., "Lugs", "board", "Allen-Bradley", etc.) •Enclosure type (if needed) •Lead positioning (if needed) •Mounting dimensions (if applicable)

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