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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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

Performing an Insulation Resistance Test

March 2023
Number of views: 7369
Article rating: 4.0

Recording duration: 7 minutes

This video explains how to check the ground insulation of an AC motor winding using the insulation resistance (IR) test. The IR test is usually the first electrical test because it indicates if the motor winding can withstand further testing, or the machine can return to service. This video shows:

How to select the megohmmeter and IR test voltage
How to connect the megohmmeter to the winding and ground the leads
How to perform the IR test and for how long
How to safely discharge the winding
How to correct the IR test result to the standard temperature of 40°C and determine if it is acceptable

Related Resources

EASA AC Three-Phase Service Order FormAn easy-to-use, 4-page service order worksheet providing places to record the most important motor repair data.

ANSI/EASA AR100

More information on this topic can be found in ANSI/EASA AR100

EASA Technical Manual

More information on this topic can be found in EASA's Technical Manual

Section 2: AC Machines
Section 7: Electrical Testing

Related Reference and Training Materials

Principles of Medium & Large AC Motors (NEMA Standards)

Section 12: Test & Inspection Procedures

Principles of Medium & Large AC Motors (IEC Standards)

Section 12: Test & Inspection Procedures

How To Wind Three-Phase Stators interactive training software

Lesson 2: Core Testing

Categories: Technical topics, AC motors, Stators/windings, Winding insulation, Repair procedures & tips, Testing, Motor testing, Electric Motor Repair Tips Videos

Tags: Motor testing Insulation resistance (IR) test

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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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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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