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New standard GB/T 12350-2022 on Safety Requirements of Small-Power Motors

13. October 2022

On November 1, 2022, the new GB standard GB/T 12350-2022 on Safety Requirements of Small-Power Motors will be implemented. This standard replaces the previous version GB/T 12350-2009.

The standard was developed in accordance with the regulations in GB/T 1.1-2020 Directives for Standardization -Part 1: Rules for the Structure and Drafting of Standardizing Documents.
Among others, the following changes are applied:

  • The following sentence has been deleted: “This does not apply to control motors (e.g., servomotor, autosynchronous motor, rotary transformer, tachogenerator, and induction phase shifter, etc.)” (see clause 1)
  • Added definitions of the following terms: “functional isolation,” “operating voltage,” and “fixed supply in batches” (see 3.12, 3.14, and 3.15).
  • The following statements were added: “rated speed range” and “rated output power range”; “for products intended to be supplied in batches, the information on the nameplate may be applied by spraying on the code or by other similar methods.”(see 4.1)
  • Direct current symbol “DC” was added (see 4.7)
  • The limits of thermal classes 200 (class N) and 220 (class R) have been added (see 10.2)
  • The minimum operating temperature requirements for insulating materials or insulating sleeves used to support live parts have been deleted (see 11.2 of the 2009 edition)
  • The test requirements for poor contact of insulating materials have been deleted (see 14.2.1 of the 2009 edition)
  • The limit requirement for clearance at an operating voltage of more than 300 V has been added (see 15.2)
  • The limit requirement for creepage distance at operating voltages of “>630 and ≤800” is added (see 15.3)
  • The non-applicable grounding situations have been modified and added (see 16.1; 16.1 of the 2009 edition);ii
  • The limit requirements of thermal classification 200 (class N) and 220 (class R) in the temperature rise test have been added (see
  • The limit requirement for bearing temperature “the temperature of the plain bearing and the rolling bearing shall not exceed 80℃ and 95℃ respectively” has been added (see 17.3.2)
  • Added the limits of thermal classification 200 (class N) and 220 (class R) in abnormal test (see 18.2).
  • “Domestic motors with electronic circuits shall be subjected to the test in accordance with 19.11 in GB 4706.1-2005 together with the complete machine” has been deleted (see 18.6 of the 2009 edition)
  • The test requirements for motors with controls have been added (see 20.2.1)
  • The Electrical strength test requirements “for the insulated winding of the motor with a rated voltage below 100 V, the test voltage (r.m.s) is 500 V+2UN,” was changed (see 20.2.2; 20.2.2 of the 2009 edition)
  • The requirements for leakage current limitation of industrial motors have been added (see section 21 and 22.2)
  • The basis for the inertum impulse withstand voltage test was changed as GB/T 5171.1, GB/T 5171.21, and GB/T 5171.22 (see 26.2; 26.2 of the 2009 edition)

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MPR Author

About the author: Verena Numssen is managing director of MPR China Certification GmbH
Publisher: MPR China Certification GmbH

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