Motor tolerance
- Thread starter kdubya
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LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Where's Bob with that chart?
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
I believe it it is the one in this link.
http://www.netaworld.org/files/neta-journals/NWsp05TechBrief.pdf
robbietan
Senior Member
- Location
- Antipolo City
For steady state conditions, NEMA specifies that motors should run from plus/minus 10% of its nameplate voltage without any difference in efficiency or performance. In this case, that is 249.3V to 304.7V for a 277V motor or that would be 432V to 528V for a 480V motor
Voltage sags (or swells) we define them as events lasting for less than a half cycle to one minute where the voltage value increases (or decreases) from 11% to 90% of the utilization voltage. I believe a motor can withstand an event without getting damaged.
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