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ANSI/EASA AR100-2020 cover

ANSI/EASA Standard AR100-2020
ANSI/EASA AR100-2020: Recommended Practice for the Repair of Rotating Electrical Apparatus is a must-have guide to the repair of rotating electrical machines. It establishes recommended practices in each step of the rotating electrical apparatus rewinding and rebuilding processes.

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Questions?

For information about ANSI/EASA AR100 or questions about the work on this standard, contact:

Mike Howell, PE
EASA Technical Support Specialist
+1 314 993 2220
mhowell@easa.com

ANSI Accredited Standards Developer Information

Space heating to prevent motor damage from condensation

  • July 2013
  • Number of views: 13737
  • Article rating: 4.2

Jim Bryan
EASA Technical Support Specialist (retired)

From time to time, the subject of space heating comes up to address issues caused by condensation in idle motors (or generators). Many feel that a motor can receive more harm from being idle than if it is in service. This is especially true in humid environ­ments where condensation can have a negative impact on winding insulation material and machined surfaces. 

Condensation forms when the temperature falls below the dew point. This meteorological term refers to the amount of water vapor the air can hold. The higher the humidity, the closer the ambient temperature will be to the dew point. This becomes a condensation problem when warm, moist air cools, especially at nightfall.

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EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual
  • Section 2: AC Machines
  • Section 5: Electronics

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)
  • Section 11: Motor Accessories & Terminal Boxes

Principles of Medium & Large AC Motors (IEC Standards)
  • Section 11: Motor Accessories & Terminal Boxes

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EASA Rewind Study cover

The Effect of Repair/Rewinding on Premium Efficiency/IE3 Motors
Tests prove Premium Efficiency/IE3 Motors can be rewound without degrading efficiency.

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EASA Good Practice Guide

Good Practice Guide to Maintain Motor Efficiency
Based on the 2019 and 2003 Rewind Studies of premium efficiency, energy efficient, IE2 (formerly EF1) and IE3 motors

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