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ANSI/EASA Standard AR100-2015: Recommended Practice for the Repair of Rotating Electrical Apparatus

Publication date: 
August 2015
Type of media: 

The American National Standards Institute (ANSI) has approved revisions in EASA’s Recommended Practice for the Repair of Rotating Electrical Apparatus. Designated as ANSI/EASA AR100-2015, the document is an updated version of ANSI/EASA AR100-2010. The first Recommended Practice to receive ANSI status was ANSI/EASAAR100-1998.

ANSI requires that standards be re-approved at least every five years. The Technical Services Committee proposed over 60 changes to the Recommended Practice (ANSI/EASA AR100-2010), and the ANSI canvass (acceptance) group added over 30 more proposals. ANSI approved the revised standard and designated it as ANSI/EASA AR100-2015.

The most significant changes to AR100 were the following:

  • Clause 1.12 (new): Added a recommendation to indicate an authorization to ship for a completed repair.
  • Clause 2.6: Changed balance quality level for machines rated above 2500 rpm to level G1.0; machines rated 2500 rpm and below remain at grade 2.5. (Note: This change will affect service centers that are in the EASA Accreditation Program or are considering accreditation. Effective August 2016, the balance level of G1.0 for motors rated above 2500 rpm will be a requirement for the Accreditation Program.)
  • Clause 3.3: Added temperature limits of 700°F (370°C) for cores with organic coreplate and 750°F (400°C) for inorganic coreplate.
  • Clause 4.2.7 (previously 4.2.8): Changed evaluation criteria for bearing insulation test, noting that there is no industry consensus for bearing insulation in motors supplied by variable frequency drives.
  • Clause 4.3.1: Winding resistance and surge tests should now be per-formed on every repair; previously they were optional. Insulation resistance test also should be performed on every repair. (Note: This change will affect service centers that are in the EASA Accreditation Program or are considering accreditation. Effective August 2016, a calibrated surge tester will be a required pieced of equipment for the Accreditation Program.)
  • Clauses 4.3.3 and 4.3.4: Insulation resistance test should now be performed on every repair; previously it was an option.
  • Clause 4.5: Added that motors should be secured on a base plate or on a resilient pad for the no-load test. Also, added recommendations for testing AC motors and DC motors that operate at above base speed.
  • Table 4-5: Unfiltered vibration limits revised to conform to current NEMA and IEC standards values.

ANSI recognizes only one standard on a topic; therefore, ANSI/EASA AR100 is the American standard for repair of rotating electrical apparatus.The Recommended Practice is an important publication to distribute both internally and to customers.

Also, you can order printed copies so that you and everyone at your repair facility will have this comprehensive set of guidelines — in bound form — for handy reference. It is also an attractive, professional handout for distribution to your customers. 

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