GB/T 12350-2022 English PDF (GBT12350-2022)

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GB/T 12350-2022: Safety requirements of small power motors
GB/T 12350-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.160.30
CCS K 20
Replacing GB/T 12350-2009
Safety requirements of small power motors
ISSUED ON: APRIL 15, 2022
IMPLEMENTED ON: NOVEMBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 4 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms and definitions ... 9 
4 Marking and description ... 11 
5 Base and enclosure... 14 
6 Mechanical assemblies and parts ... 15 
7 Anti-corrosion ... 17 
8 Electrical connection ... 17 
9 Connecting pieces ... 20 
10 Internal wiring ... 20 
11 Electrical insulation support ... 22 
12 Evaluation of insulation systems ... 22 
13 Brush holder ... 23 
14 Non-metallic parts ... 24 
15 Clearance and creepage distance ... 27 
16 Grounding ... 28 
17 Temperature rise test ... 29 
18 Abnormal test ... 35 
19 Endurance test ... 37 
20 Insulation resistance and electrical strength ... 38 
21 Leakage current at operating temperature ... 40 
22 Damp heat test ... 42 
23 Start ... 43 
24 Components ... 43 
25 Electromagnetic compatibility ... 45 
26 Additional requirements ... 47 
27 Inspection rules ... 48 
Appendix A (Normative) Centrifugal switch ... 50 
Appendix B (Normative) Motor running capacitors ... 51 
Appendix C (Normative) Motor start capacitors ... 53 
Appendix D (Normative) Thermal motor protectors ... 55 
Appendix E (Normative) Thermal-links ... 56 
References ... 57 
Safety requirements of small power motors
1 Scope
This document specifies the general safety requirements of small power motors.
This document applies to small power motors (hereinafter referred to as the motors)
specified in GB/T 5171.1; it also applies as a reference to the implementation of
other similar motors.
2 Normative references
The following documents are normatively referenced in this document and are
indispensable for its application. For dated references, only the version
corresponding to that date is applicable to this document; for undated references, the
latest version (including all amendments) is applicable to this document.
GB/T 755, Rotating electrical machines - Rating and performance
GB/T 1971, Rotating electrical machines - Terminal markings and direction of
rotation
GB/T 2423.3, Environmental testing - Part 2: Testing method - Test Cab: Damp
heat, steady state
GB/T 2423.4, Environmental testing for electric and electronic products - Part 2:
Test method - Test Db: Damp heat, cyclic (12h+12h cycle)
GB/T 2423.55, Environmental testing for electric and electronic products - Part 2:
Test methods - Test Eh: hammer tests
GB/T 2900.25, Electrotechnical terminology - Rotating electrical machines
GB/T 2900.27, Electrotechnical terminology - Small-power motor
GB/T 3667.1-2016, AC motor capacitors - Part 1: General - Performance, testing
and rating - Safety requirements - Guide for installation and operation
GB/T 3667.2-2016, AC motor capacitors - Part 2: Motor start capacitors
GB/T 4207, Method for the determination of the proof and the comparative
tracking indices of solid insulating materials
GB/T 17626.2, Electromagnetic compatibility - Testing and measurement
techniques - Electrostatic discharge immunity test
GB/T 17626.4, Electromagnetic compatibility - Testing and measurement
techniques - Electrical fast transient/burst immunity test
GB/T 17626.5, Electromagnetic compatibility – Testing and measurement
techniques－Surge immunity test
GB/T 17948.1, Rotating electrical machines – Functional evaluation of insulation
systems – Test procedures for wire-wound windings – Thermal evaluation and
classification
GB/T 17948.2, Functional evaluation of insulation systems for rotating electrical
machines – Test procedures for wire-wound windings – Classification of changes
and insulation component substitutions
JB/T 6742, The commutator of small power motors
JB/T 9547-2011, Specification for centrifugal starting switch use of single-phase
motor
JB/T 13609, Specification for electronic starting switcher used for single-phase
motors
IEC 60384-14:2016, Fixed capacitors for use in electronic equipment – Part 14:
Sectional specification – Fixed capacitors for electromagnetic interference
suppression and connection to the supply mains Sectional specification – Fixed
capacitors for electromagnetic interference suppression and connection to the
supply mains)
3 Terms and definitions
Terms and definitions determined by GB/T 2900.25, GB/T 2900.27, GB 4706.1 and
GB/T 5171.1, as well as the following, are applicable to this document.
3.1 Creepage distance
The shortest path distance along the surface of insulating material between two
conductive parts, or between a conductive part and an accessible surface.
3.2 Clearance
The shortest spatial distance between two conductive parts, or between a conductive
part and an accessible surface.
3.3 Enclosure
Easy-to-reach motor surfaces, including the surfaces of motor junction box and other
parts. Excluding hard-to-reach parts.
3.4 Component
Special accessories for motors.
Examples: centrifugal switch, capacitor, thermal protector, etc.
3.5 Insulator
A component used to insulate and support conductors.
3.6 Diameter of motor
Diameter measured on the circumscribed circle of the motor stator casing, excluding
the dimensions of the motor’s radiation ribs, junction boxes and welds.
3.7 Pollution degree
Expected degree of contamination of the microenvironment, represented by
numbers.
Note: Pollution degree 1: non-pollution, or only dry, non-conductive pollution,
which is of no effect.
Pollution degree 2: only non-conductive pollution in general; but occasional
short-lived conductive pollution by must-be-expected condensation.
Pollution degree 3: conductive pollution; or conductive pollution changed
from dry non-conductive pollution due to expected condensation.
Pollution degree 4: persistent conductive pollution, for example, caused by
conductive dust or rain or snow.
3.8 Basic insulation
Insulation applied to live parts to provide basic protection against electric shock.
3.9 Supplementary insulation
Separate insulation additionally applied to basic insulation in order to provide
protection against electric shock in the event of failure of the basic insulation.
3.10 Double insulation
Insulation system consisting of basic insulation and supplementary insulation.
3.11 Reinforced insulation
e) symbols of the nature of power supply, except those marked with the rated
frequency;
f) rated current (Unit: A);
g) rated output power or rated output power range (unit: W or kW); the motor
with rated torque is only marked with rated output torque or rated output
torque range:
-- For motors that are completely fitted with other equipment and devices and
cannot be separated separately, such as vacuum cleaner motors and drainage
pump motors, it is allowed to mark the input power; it shall be indicated on
the nameplate that the power is input power;
-- The rated output power range or rated output torque range is only applicable
to motors with stepless speed regulation;
-- For motors with step speed regulation function, rated output power or rated
output torque shall be marked in grades;
h) rated speed or rated speed range (u...