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Electrical Transformer Calculator

The Construction Monkey Transformer Calculator lets you figure out electrical characteristics of your system given a specific transformer size. By inputting the primary and secondary electrical system characteristics and the transformer properties Construction Monkey will calculate the disconnect size and feeder size for both the primary and secondary.

Make your selections below and the form will automatically update the values.

Enter Information

Primary Side of Transformer

Voltage/Phase:

Transformer Information

Primary Configuration:

Transformer Size:

Secondary Configuration:

Seconday Side of Transformer

Voltage/Phase:

Wire Properties

Phase/Neutral Material:

Ground Material:

Results

Enter information and click on the "Calculate" button to get the results.

Rough Visualization

Primary



	Transformer Ground:



Secondary

Notes:

¹Maximum conduit size is 4"

²Conduit is assumed to be EMT

³Maximum wire size is 500MCM

³Overcurrent Sizes are based on NEC Table 450.3(B)

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No guarantees are made as to the accuracy of the calculation or compliance with local codes. Verify all calculations with a professional engineer. If you find an error, or have a suggestion, please send us an email.