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.
Primary Side of Transformer
Seconday Side of Transformer
Enter information and click on the "Calculate" button to get the results.
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)
Labor Forecasts that include three (3) scientific data points: Remaining Hours, Jobsite Productivity Performance, and Qualified Expert Opinions. These are combined utilizing our proprietary algorithm to provide you with the most probable forecasted labor hours.
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.