Want to Know More?
Tyler Voss Membership & Communications Specialist+1 314 993 2220tvoss@easa.com
SEND ME MORE INFORMATIONJOIN EASA
SEARCH THE RESOURCE LIBRARY
Try Asking Eddy!EASA's AI assistant is ready to help 24/7/365 in the language of your choice.
EASA.COM/EDDY
REGISTER FOR UPCOMING TRAINING
LEARN MORE GO TO LEARNING CENTERBUY RENEWVIEW/MANAGE ENROLLMENT INFO
Need an Accredited service center?Find a service center that has proven they repair electric motors in accordance with ANSI/EASA's AR100.
VIEW THE LISTLEARN MORE ABOUT THE PROGRAM
DOWNLOAD ACCREDITATION CHECKLISTACCREDITED? VIEW YOUR RECORDS
2025 Session RecordingsRevisit the events of this year's convention! Rewind 2025 includes recordings, slides and papers that all add to your value in attending.
ACCESS THE RECORDINGS
Engage locallyEASA's international membership is divided into 10 Regions that are made up of 32 Chapters.
EXPLORE CHAPTERS & EVENTS NEAR YOUCHAPTER OFFICER RESOURCES
SEARCH THE ONLINE STORE
CUSTOM BRANDED PRODUCTSDOWNLOADS YOU HAVE PURCHASEDVIEW YOUR PURCHASED TRAININGVIEW CONVENTION RECORDINGS
Jim Bryan EASA Technical Support Specialist (retired)
There are many misconceptions about Service Factor (SF) in the industry. Some feel it is meant for temporary excursions into overload conditions; others consider it to be an allowance for permanent overload. The truth is that it is neither. As defined in the EASA Technical Manual and NEMA MG1, the definition of service factor is:
"A multiplier which, when applied to rated power, indicates a permissible power loading that may be carried under the conditions specified for the service factor."
The NEMA MG1-2011 theory of SF says that a motor is thermally capable of overload to that point within the insulation class at normal service conditions.
Since any increase in load increases the current, this overload will increase the operating temperature of the motor. For every increase of 10ºC, the motor winding expected life is reduced by one-half. It does not matter what the source of that increase in temperature is; overload, poor ventilation, low voltage or high ambient temperature are just a few.
LOGIN TO DOWNLOAD THE ARTICLE