Forums » Electrical Engineering

NEC 277v motors

    • 17 posts
    December 25, 2019 10:19 PM PST

     Where can I find the amp loads for these 277v motors?

    • 157 posts
    December 26, 2019 8:27 AM PST

    What motors?  What is the HP of the motors and the motors should have a nameplate showing the FLA-- amps

    • 42 posts
    December 26, 2019 8:45 AM PST

     Motors rated at 277 volts are not as common as other voltages but are sometimes used within equipment that has an overall nameplate. The equipment nameplate value can be used in that situation as stated in 430.6(A)(1) Exception No. 2. If being installed as a separate motor make sure all of the other applicable rules of Article 430 are complied with, including 430.7. If there is no table value given in the NEC then the only choice is to use the nameplate value or get the value from the motor manufacturer.