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Performing an Insulation Resistance Test

  • March 2023
  • Number of views: 6330
  • 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

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

Related articles

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