Motor Testing Reference

IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery

Updated 2026-10-13

Edition timelineIEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery: 201320112012201320142015IEEE Recommended Practice for Testing Insulation Resistance of Electric MachineryIEEE 43-2013IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery2013
Edition timeline. Editions recorded for this standard from the publisher's catalog. The filled dot marks the edition listed as current.
Edition timeline: edition years from the publishers' catalogs; editions without a four-digit year are listed but not plotted.
StandardEditionKindCurrentRecord
IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery2013Approvalstd.ieee-43.approved
IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery2013Editionstd.ieee-43.edition.2013
IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery2013Revision ofstd.ieee-43.revision-of

IEEE 43-2013 is the IEEE recommended practice for testing the insulation resistance of electric machinery, published under the full title IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery. [1] [2] It describes direct-voltage procedures for measuring the insulation resistance and polarization index of stator and rotor windings and explains how the results are interpreted. [3] The IEEE catalog lists the 2013 edition as an inactive-reserved standard. [4]

Scope

The publisher's catalog describes the document as covering direct-voltage procedures for insulation resistance and polarization index measurements on stator and rotor windings, together with the interpretation of the results. [3] Within the text, the scope reaches the armature and field windings of synchronous machines, induction machines, direct-current machines and synchronous condensers, and leaves out fractional-horsepower machines. [Electrical Testing Reference] The stated purposes are to define the two tests, to name the factors that affect the readings, to recommend uniform test conditions and to give a basis for interpreting results. [Electrical Testing Reference]

Edition history

The 2013 edition is a revision of IEEE 43-2000. [5] It was approved on December 11, 2013 and published on March 6, 2014. [6] [2] The document was sponsored by the Electric Machinery Committee of the IEEE Power and Energy Society. [7]

Status

The IEEE catalog lists IEEE 43-2013 with the status Inactive-Reserved Standard and records March 21, 2024 as its inactivation date. [4]

Structure

Clause 4 of IEEE 43-2013 deals with safety, and clause 5 sets out the insulation resistance and polarization index test procedures, including the choice of test voltage. [8] [9] Clause 6 treats the factors that influence the readings, such as surface condition, moisture, temperature and test voltage. [10] Clause 7 covers the conditions recorded at the time of test, clause 8 the winding connections, and clause 9 the measuring instruments and methods. [11] [12] Clause 10 covers the application of the test voltage, including allowance for the drop across a protective resistor. [13]

Clause 11 addresses the interpretation of results, and clause 12 gives recommended minimum values for insulation resistance and polarization index. [14] [Electrical Testing Reference] [Electrical Testing Reference] An informative annex, Annex A, describes variants of the polarization index based on shorter reading times. [15] [Electrical Testing Reference]

Related tests

The recommended practice is the method reference for the insulation resistance test and for the polarization index of rotating machine windings. [Electrical Testing Reference] [Electrical Testing Reference] The dielectric absorption ratio used for rotating machinery in ANSI/NETA ATS-2025 corresponds to one of its informative variants. [Electrical Testing Reference] [Electrical Testing Reference]

Notes

  1. IEEE 43-2013. The publisher catalog gives the full title of IEEE 43-2013 as IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery. Value: IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery. Datum std.ieee-43.title
  2. IEEE 43-2013. IEEE 43-2013 is the 2013 edition of the IEEE document titled IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery, published on 2014-03-06. Value: 2013. Datum std.ieee-43.edition.2013
  3. IEEE 43-2013. The recommended practice describes direct-voltage procedures for measuring the insulation resistance and polarization index of stator and rotor windings and explains how to interpret the results. Datum std.ieee-43.scope
  4. IEEE 43-2013. The IEEE catalog lists IEEE 43-2013 with the status Inactive-Reserved Standard, with an inactivation date of 2024-03-21. Value: Inactive-Reserved Standard. Datum std.ieee-43.status
  5. IEEE 43-2013, clause Front matter. IEEE 43-2013 is a revision of IEEE 43-2000. Value: 2013. Datum std.ieee-43.revision-of
  6. IEEE 43-2013, clause Front matter. The 2013 edition of IEEE 43 was approved on 2013-12-11. Value: 2013. Datum std.ieee-43.approved
  7. IEEE 43-2013, clause Front matter. IEEE 43-2013 was sponsored by the Electric Machinery Committee of the IEEE Power and Energy Society. Datum std.ieee-43.sponsor
  8. IEEE 43-2013, clause 4. Clause 4 of IEEE 43-2013 deals with safety during insulation resistance testing. Datum std.ieee-43.structure.safety
  9. IEEE 43-2013, clause 5. Clause 5 of IEEE 43-2013 sets out the insulation resistance and polarization index test procedures and the choice of test voltage. Datum std.ieee-43.structure.procedure
  10. IEEE 43-2013, clause 6. Clause 6 of IEEE 43-2013 covers the factors that affect insulation resistance readings, among them surface condition, moisture, temperature and test voltage. Datum std.ieee-43.structure.factors
  11. IEEE 43-2013, clause 7, 8. Clause 7 of IEEE 43-2013 covers the conditions recorded at the time of test, and clause 8 covers the winding connections used for the test. Datum std.ieee-43.structure.conditions
  12. IEEE 43-2013, clause 9. Clause 9 of IEEE 43-2013 describes the instruments and methods for measuring insulation resistance. Datum std.ieee-43.structure.instruments
  13. IEEE 43-2013, clause 10. Clause 10 of IEEE 43-2013 covers how the test voltage is applied and held, including allowance for the drop across a protective resistor. Datum std.ieee-43.structure.voltage-application
  14. IEEE 43-2013, clause 11, 12. Clause 11 of IEEE 43-2013 covers the interpretation of test results, and clause 12 gives recommended minimum values. Datum std.ieee-43.structure.interpretation
  15. IEEE 43-2013, clause Annex A. Annex A of IEEE 43-2013 is informative and describes variants of the polarization index. Datum std.ieee-43.structure.annex-a

Data records

  • The 2013 edition of IEEE 43 was approved on 2013-12-11. Value: 2013. Source: IEEE 43-2013, clause Front matter. Verified 2026-10-13. Record std.ieee-43.approved
  • IEEE 43-2013 is the designation of the document titled IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery. Value: IEEE 43-2013. Source: IEEE 43-2013. Verified 2026-10-13. Record std.ieee-43.designation
  • IEEE 43-2013 is the 2013 edition of the IEEE document titled IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery, published on 2014-03-06. Value: 2013. Source: IEEE 43-2013. Verified 2026-10-13. Record std.ieee-43.edition.2013
  • IEEE 43-2013 is a revision of IEEE 43-2000. Value: 2013. Source: IEEE 43-2013, clause Front matter. Verified 2026-10-13. Record std.ieee-43.revision-of
  • The recommended practice describes direct-voltage procedures for measuring the insulation resistance and polarization index of stator and rotor windings and explains how to interpret the results. Source: IEEE 43-2013. Verified 2026-10-13. Record std.ieee-43.scope
  • IEEE 43-2013 was sponsored by the Electric Machinery Committee of the IEEE Power and Energy Society. Source: IEEE 43-2013, clause Front matter. Verified 2026-10-13. Record std.ieee-43.sponsor
  • The IEEE catalog lists IEEE 43-2013 with the status Inactive-Reserved Standard, with an inactivation date of 2024-03-21. Value: Inactive-Reserved Standard. Source: IEEE 43-2013. Verified 2026-10-13. Record std.ieee-43.status
  • Annex A of IEEE 43-2013 is informative and describes variants of the polarization index. Source: IEEE 43-2013, clause Annex A. Verified 2026-10-13. Record std.ieee-43.structure.annex-a
  • Clause 7 of IEEE 43-2013 covers the conditions recorded at the time of test, and clause 8 covers the winding connections used for the test. Source: IEEE 43-2013, clause 7, 8. Verified 2026-10-13. Record std.ieee-43.structure.conditions
  • Clause 6 of IEEE 43-2013 covers the factors that affect insulation resistance readings, among them surface condition, moisture, temperature and test voltage. Source: IEEE 43-2013, clause 6. Verified 2026-10-13. Record std.ieee-43.structure.factors
  • Clause 9 of IEEE 43-2013 describes the instruments and methods for measuring insulation resistance. Source: IEEE 43-2013, clause 9. Verified 2026-10-13. Record std.ieee-43.structure.instruments
  • Clause 11 of IEEE 43-2013 covers the interpretation of test results, and clause 12 gives recommended minimum values. Source: IEEE 43-2013, clause 11, 12. Verified 2026-10-13. Record std.ieee-43.structure.interpretation
  • Clause 5 of IEEE 43-2013 sets out the insulation resistance and polarization index test procedures and the choice of test voltage. Source: IEEE 43-2013, clause 5. Verified 2026-10-13. Record std.ieee-43.structure.procedure
  • Clause 4 of IEEE 43-2013 deals with safety during insulation resistance testing. Source: IEEE 43-2013, clause 4. Verified 2026-10-13. Record std.ieee-43.structure.safety
  • Clause 10 of IEEE 43-2013 covers how the test voltage is applied and held, including allowance for the drop across a protective resistor. Source: IEEE 43-2013, clause 10. Verified 2026-10-13. Record std.ieee-43.structure.voltage-application
  • The publisher catalog gives the full title of IEEE 43-2013 as IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery. Value: IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery. Source: IEEE 43-2013. Verified 2026-10-13. Record std.ieee-43.title

Sources

  • IEEE 43-2013, IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery, 2013 edition, IEEE. Held as: Public page. Publisher page
  • IEEE 43-2013, Recommended Practice for Testing Insulation Resistance of Electric Machinery, 2013 edition, IEEE. Cited: clause Front matter; clause 4; clause 5; clause 6; clause 7, 8; clause 9; clause 10; clause 11, 12; clause Annex A. Held as: Purchased single-user copy. Publisher page

Obtaining the documents

Changelog (31 entries)
DateRevisionChange
2026-10-131created
2026-10-13created (std.ieee-43.approved)
2026-10-13reviewed (std.ieee-43.approved)
2026-10-13created (std.ieee-43.edition.2013)
2026-10-13reviewed (std.ieee-43.edition.2013)
2026-10-13created (std.ieee-43.revision-of)
2026-10-13reviewed (std.ieee-43.revision-of)
2026-10-13created (std.ieee-43.scope)
2026-10-13reviewed (std.ieee-43.scope)
2026-10-13created (std.ieee-43.sponsor)
2026-10-13reviewed (std.ieee-43.sponsor)
2026-10-13created (std.ieee-43.status)
2026-10-13reviewed (std.ieee-43.status)
2026-10-13created (std.ieee-43.structure.annex-a)
2026-10-13reviewed (std.ieee-43.structure.annex-a)
2026-10-13created (std.ieee-43.structure.conditions)
2026-10-13reviewed (std.ieee-43.structure.conditions)
2026-10-13created (std.ieee-43.structure.factors)
2026-10-13reviewed (std.ieee-43.structure.factors)
2026-10-13created (std.ieee-43.structure.instruments)
2026-10-13reviewed (std.ieee-43.structure.instruments)
2026-10-13created (std.ieee-43.structure.interpretation)
2026-10-13reviewed (std.ieee-43.structure.interpretation)
2026-10-13created (std.ieee-43.structure.procedure)
2026-10-13reviewed (std.ieee-43.structure.procedure)
2026-10-13created (std.ieee-43.structure.safety)
2026-10-13reviewed (std.ieee-43.structure.safety)
2026-10-13created (std.ieee-43.structure.voltage-application)
2026-10-13reviewed (std.ieee-43.structure.voltage-application)
2026-10-13created (std.ieee-43.title)
2026-10-13reviewed (std.ieee-43.title)

Cite this page

Cite the governing standard for the fact itself; cite this page as the finding aid.

Permanent revision URL: https://www.motortestingreference.com/standards/ieee-43/rev/1/. Current version: https://www.motortestingreference.com/standards/ieee-43/.

"IEEE Recommended Practice for Testing Insulation Resistance of Electric Machinery." Motor Testing Reference. Revision 1, 2026-10-13. https://www.motortestingreference.com/standards/ieee-43/rev/1/.