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GB/T 42125.3-2024: Safety requirements for electrical equipment for measurement, control and laboratory use - Part 3: Particular requirements for refrigerating equipment
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Safety requirements for electrical equipment for measurement, control and laboratory use - Part 3: Particular requirements for refrigerating equipment
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GB/T 42125.3-2024
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Basic data | Standard ID | GB/T 42125.3-2024 (GB/T42125.3-2024) | | Description (Translated English) | Safety requirements for electrical equipment for measurement, control and laboratory use - Part 3: Particular requirements for refrigerating equipment | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | N20 | | Classification of International Standard | 19.080 | | Word Count Estimation | 42,498 | | Date of Issue | 2024-10-26 | | Date of Implementation | 2026-11-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 42125.3-2024: Safety requirements for electrical equipment for measurement, control and laboratory use - Part 3: Particular requirements for refrigerating equipment
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ICS 19.080
CCSN20
National Standard of the People's Republic of China
Safety requirements for electrical equipment for measurement, control and laboratory use
Part 3.Particular requirements for refrigeration equipment
measurement,control,andlaboratoryuse-Part 2-011.Particular
Released on October 26, 2024
Implementation on November 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction IV
1 Scope and Purpose 1
2 Normative references 2
3 Terms and Definitions 2
4 Experiment 3
5 Signs and Documents 5
6 Protection against electric shock 8
7.Protection against mechanical hazards 8
8 Mechanical stress resistance 8
9 Prevent the spread of fire 8
10 Temperature limits and heat resistance of the device 9
11 Protection against hazards from fluids and solid foreign matter 10
12 Protection against radiation (including laser sources), sound pressure and ultrasonic pressure 17
13 Protection against released gases and substances, explosions and implosions 17
14 Components and Assemblies17
15 Protection using interlocking devices 18
16 Hazards caused by application 18
17 Risk Assessment 18
Appendix 19
Appendix G (Informative) Leakage and rupture caused by fluid pressure 20
Appendix AA (Normative) Non-sparking "n" type electrical apparatus 21
Appendix BB (Informative) Hazards associated with refrigeration systems and refrigerants 22
Appendix CC (Informative) Safety requirements for components and piping 24
Appendix DD (Informative) Information and marking requirements for equipment containing flammable refrigerants 29
Reference 32
Preface
This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents"
Drafting.
This document is Part 3 of GB/T 42125 "Safety requirements for electrical equipment for measurement, control and laboratory use".
The following parts have been published.
--- Part 1.General requirements;
--- Part 2.Particular requirements for laboratory equipment for heating materials;
--- Part 3.Particular requirements for refrigeration equipment;
--- Part 4.Particular requirements for climate and environmental tests and other temperature regulation equipment;
--- Part 5.Particular requirements for laboratory centrifuges;
--- Part 7.Safety requirements for hand-held and hand-operated probe assemblies for electrical measurement and test;
--- Part 10.Particular requirements for insulation resistance measurement and dielectric strength test equipment;
--- Part 14.Particular requirements for automatic and semi-automatic equipment for laboratory use for analytical and other purposes;
--- Part 18.Particular requirements for control equipment;
--- Part 19.Particular requirements for electric control valve actuators.
This document is equivalent to IEC 61010-2-011.2019 "Safety requirements for electrical equipment for measurement, control and laboratory use Part 2-011
Part 1.Special requirements for refrigeration equipment.
The following minimal editorial changes have been made to this document.
--- To coordinate with the existing standard, the name of the document is changed to "Safety requirements for electrical equipment for measurement, control and laboratory use Part 3.
Particular requirements for refrigeration equipment";
--- Deleted the informative Appendix L "Term Index".
Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents.
This document was proposed by the China Machinery Industry Federation.
This document is under the jurisdiction of the National Technical Committee for Safety Standardization of Measurement, Control and Laboratory Electrical Equipment (SAC/TC338).
This document was drafted by. Beijing Medical Device Inspection Institute (Beijing Medical Bioprotection Equipment Inspection and Research Center), Zhejiang Xuezhong
Carbon Environmental Technology Co., Ltd., Mechanical Industry Instrumentation Comprehensive Technical and Economic Research Institute, Qingdao Haier Biomedical Co., Ltd., Thermo Fisher Scientific
Fisher Scientific (China) Co., Ltd., Jiangsu Institute of Metrology (Jiangsu Energy Measurement Data Center), Beijing Medical Device Evaluation
Inspection Center, Liaoning Medical Device Inspection and Testing Institute, Bingshan Songyang Biotechnology (Dalian) Co., Ltd.
The main drafters of this document are. Feng Lei, Xu Yijun, Liu Xiaojing, Liang Zhenshi, Liu Zhanjie, Kong Ning, Shao Yuda, Chen Ran, Wang Bo, Liu Fazhu,
Chen Haitao and Xu Yueming.
introduction
GB/T 42125 "Safety requirements for electrical equipment for measurement, control and laboratory use" is planned to consist of 20 parts.
--- Part 1.General requirements. The purpose is to specify the general safety requirements of electrical equipment for measurement, control and laboratory use and their accessories
Require.
--- Part 2.Particular requirements for laboratory equipment for material heating. The purpose is to specify the special requirements for laboratory equipment for material heating.
Safety requirements.
--- Part 3.Particular requirements for refrigeration equipment. The purpose is to specify the special safety requirements for refrigeration equipment used in measurement, control and laboratory
Require.
--- Part 4.Climate and environmental tests and special requirements for other temperature regulation equipment. The purpose is to specify climate and environmental tests
Special safety requirements for testing and other temperature regulating equipment.
--- Part 5.Particular requirements for laboratory centrifuges. The purpose is to specify special safety requirements for laboratory centrifuges.
--- Part 6.Particular requirements for test and measuring circuits. The purpose is to specify special safety requirements for test and measuring circuits.
--- Part 7.Safety requirements for hand-held and hand-operated probe assemblies for electrical measurement and testing. The purpose is to specify the safety requirements for hand-held and hand-operated probe assemblies.
Safety requirements for head assemblies and related accessories.
--- Part 8.Particular requirements for hand-held and hand-operated current sensors for electrical measurement and testing. The purpose is to specify the requirements for hand-held and hand-operated current sensors.
Special safety requirements for current sensors.
--- Part 9.Particular requirements for household and professional handheld multimeters capable of measuring mains voltage.
Particular safety requirements for hand-held multimeters for household and professional use for measuring mains supply voltage.
--- Part 10.Particular requirements for insulation resistance measurement and dielectric strength test equipment. The purpose is to specify the output voltage AC
Safety requirements for equipment used for insulation resistance measurement and dielectric strength testing at 50 V or DC 120 V and above.
--- Part 11.Particular requirements for sterilizers and washer-disinfectors for processing medical materials.
Particular safety requirements for sterilizers and washer-disinfectors.
--- Part 12.Particular requirements for laboratory mixing and stirring equipment. The purpose is to specify electric stirring equipment used for mechanical stirring and stirring
Particular safety requirements for laboratory equipment and its accessories.
--- Part 13.Particular requirements for laboratory atomic spectrometers with thermal atomization and ionization.
Particular safety requirements for atomization and ionization atomic spectrometers.
--- Part 14.Particular requirements for automatic and semi-automatic equipment for laboratory analysis and other purposes. The purpose is to specify the
Particular safety requirements for automatic and semi-automatic equipment for analytical and other purposes.
--- Part 15.Particular requirements for cabinet X-ray systems. The purpose is to specify special safety requirements for cabinet X-ray systems.
--- Part 16.Particular requirements for in vitro diagnostic (IVD) medical devices. The purpose is to specify the intended use for in vitro diagnostic medical purposes
Special requirements for medical devices.
--- Part 17.Particular requirements for equipment used by children in educational institutions. The purpose is to specify the requirements for the use of equipment by student operators in educational institutions.
Particular safety requirements for electrical equipment and accessories.
--- Part 18.Particular requirements for control equipment. The purpose is to specify the special requirements and related requirements for control equipment used in industrial environments
identification test.
--- Part 19.Particular requirements for electric control valve actuators. The purpose is to specify the requirements for electric control valve actuators installed in industrial processes or discrete control
Safety requirements for electric control valve actuators and solenoid coils in environments.
--- Part 20.Particular requirements for industrial communication circuits and communication port interconnections. The purpose is to specify the requirements for installation in process or discrete control
Particular safety requirements for industrial communication circuits in an environment.
Note. The correspondence between each part and the IEC 61010 series standards is as follows.
--- Part 1 corresponds to IEC 61010-1;
--- Part 2 corresponds to IEC 61010-2-010;
--- Part 3 corresponds to IEC 61010-2-011;
--- Part 4 corresponds to IEC 61010-2-012;
--- Part 5 corresponds to IEC 61010-2-020;
--- Part 6 corresponds to IEC 61010-2-030;
--- Part 7 corresponds to IEC 61010-031;
--- Part 8 corresponds to IEC 61010-2-032;
--- Part 9 corresponds to IEC 61010-2-033;
--- Part 10 corresponds to IEC 61010-2-034;
--- Part 11 corresponds to IEC 61010-2-040;
--- Part 12 corresponds to IEC 61010-2-051;
--- Part 13 corresponds to IEC 61010-2-061;
--- Part 14 corresponds to IEC 61010-2-081;
--- Part 15 corresponds to IEC 61010-2-091;
--- Part 16 corresponds to IEC 61010-2-101;
--- Part 17 corresponds to IEC 61010-2-130;
--- Part 18 corresponds to IEC 61010-2-201;
--- Part 19 corresponds to IEC 61010-2-202;
--- Part 20 corresponds to IEC 61010-2-203.
IEC 61010-2-010, together with IEC 61010-2-011 and IEC 61010-2-012, addresses the application of heating and
Special hazards during cooling process. The three documents are organized as follows.
IEC 61010-2-010 specifically addresses the hazards associated with equipment containing heating systems
IEC 61010-2-011 specifically addresses the hazards associated with equipment containing refrigeration systems
IEC 61010-2-012
Specifically addresses the hazards associated with combined equipment that contains both heating and cooling systems that interact with each other.
equipment and heating or cooling systems alone present additional or more severe hazards; this document also addresses the
Hazards associated with handling materials exposed to elements such as radiation, high humidity, carbon dioxide, and mechanical movement
Guidelines for Correctly Selecting 3 Related Documents
For equipment that only includes a material heating system and does not include a cooling system or other environmental factors, the requirements of IEC 61010-2-010 must be met.
The requirements of IEC 61010-2-011 and IEC 61010-2-012 do not need to be met; similarly, for a system that only contains a refrigeration system and does not contain material heating,
Equipment that is subject to thermal systems or other environmental factors must meet the requirements of IEC 61010-2-011 and does not need to meet the requirements of IEC 61010-2-010 and IEC 61010-
However, for equipment that contains both a material heating system and a cooling system, or for equipment where the material being processed in the intended application will be
When a large amount of heat is introduced into the cooling system, it is necessary to determine the
If the interaction between the heating and cooling functions does not create additional or more severe hazards,
or more serious danger, then the two functions need to meet the requirements of IEC 61010-2-010 and IEC 61010-2-011 respectively; otherwise, if
If additional or more serious hazards are generated, or the equipment also contains other processing elements for materials, the equipment must meet IEC 61010-2-012
rather than meeting the requirements of IEC 61010-2-010 or IEC 61010-2-011.
What are the dangers of refrigeration systems?
The refrigeration system consisting of a motor-compressor, a condenser, an expansion device and an evaporator (as shown in Figure 101) includes but is not limited to the following.
Typical hazards described.
---The maximum temperature of the low-pressure side of the motor-compressor (return air temperature). The motor-compressor uses refrigerant to cool the motor, and it is necessary to ensure
The maximum temperature on the low voltage side shall not exceed the insulation rating of the motor under the most unfavorable conditions.
---The maximum pressure at the low-pressure side inlet of the motor-compressor. The motor-compressor housing directly bears this pressure, so the motor-
The compressor casing must be designed to withstand the most adverse pressure conditions while providing suitable pressure vessels.
Safety margin.
--- Maximum temperature on the high-pressure side of the condenser. Under the most unfavorable conditions, if the operator is exposed to this temperature or the insulation deteriorates, the condenser
The temperature on the high pressure side of the device may cause a dangerous temperature change.
--- Maximum pressure at the high-pressure side outlet of the motor-compressor. from the refrigerant components downstream of the motor-compressor to the expansion device
Directly bear the pressure, so the design rating of these components must ensure that they can withstand the pressure under the most adverse conditions, and at the same time
The force container provides an appropriate safety margin.
---Maximum control temperature. the soaking temperature condition for releasing heat, which may affect the maximum temperature of the low-pressure side of the motor-compressor and
If the operator is exposed to such temperature or the insulation deteriorates, it will cause a temperature hazard.
Whether it is the overall heating function of the equipment or the heat release of the cooled material, the impact under the most unfavorable conditions needs to be evaluated.
--- When the refrigeration system is operating under the most unfavorable conditions, including any defrost cycle that may be applicable, the equipment should establish a stable current
consumption.
The most unfavorable conditions of the equipment need to be determined, including the most unfavorable normal use conditions and the most unfavorable test results under single fault conditions.
Figure 101 Schematic diagram of a refrigeration system including a condenser
The selection process is shown in Figure 102.
Figure 102 Selection process flow chart
This document should be combined with GB/T 42125.1-2024 "Safety requirements for electrical equipment for measurement, control and laboratory use Part 1.General
Requirements》.
The part of this document marked "applicable" indicates that the corresponding clauses of GB/T 42125.1-2024 are applicable to this document; the part of this document marked "replaces" indicates that the corresponding clauses of GB/T 42125.1-2024 are applicable to this document.
The part marked as "modified" indicates that the provisions of this document shall prevail; the part marked as "added" in this document indicates that in addition to complying with GB/T 42125.1-
In addition to the corresponding provisions of GB/T 42125.1-2024, the provisions added in this document must also be complied with.
The number of the article added to this document begins with 101, such as 3.1.101, and the number of the appendix added to this document begins with AA, such as Appendix AA,
Appendix BB.
Safety requirements for electrical equipment for measurement, control and laboratory use
Part 3.Particular requirements for refrigeration equipment
1 Scope and Purpose
Except for the following, Chapter 1 of GB/T 42125.1-2024 is applicable.
1.1.1 Equipment to which this document applies
replace.
Replace the second paragraph with the following.
This document specifies the special safety requirements for the following types a) to c) of electrical equipment and their accessories, regardless of whether these equipment and their accessories are intended to be used.
Wherever the equipment contains a refrigeration system and directly controls the refrigeration system, whether the refrigeration system is an integral part of the equipment or
It is independent of the device.
This document specifies all requirements for refrigeration systems using no more than 150g of flammable refrigerant per stage.
For flammable refrigerants injected in excess of this amount, additional requirements beyond the current scope of this document apply.
Increase.
Add the following after the last paragraph.
NOTE 101 Examples of refrigeration equipment include, but are not limited to, laboratory equipment such as laboratory refrigerators, freezers, and refrigerated display cabinets.
Equipment, in whole or in part, may fall within the scope of this document and of one or more other parts of IEC 61010.
In certain cases, the requirements of those other parts also apply. In particular, if the equipment is intended to be used as a centrifuge, the requirements of IEC 61010-2-020 apply.
However, if the equipment includes a cooling system and a heating function, when they are combined they may create additional hazards that are more severe than when they are separated.
When risks arise, IEC 61010-2-012 may apply instead of this document.
Further information is provided in the selection process flow chart (Figure 102) and guidelines in the Introduction.
1.1.2 Equipment not included in the scope of this document
Increase.
Add the following new item after item j).
aa) Transcritical refrigerant systems (using CO2) or systems using ammonia (NH3) as the refrigerant.
1.2 Purpose
1.2.1 Aspects included in the scope of this document
replace.
Replace the first paragraph with the following.
The purpose of this document is to ensure that refrigeration equipment is designed and constructed in a manner that provides operators with information on the specific hazards associated with refrigeration systems.
Provide adequate protection for personnel, bystanders, trained maintenance personnel and the surrounding environment.
Increase.
Add the following note after the existing note.
NOTE 101 A list of hazards associated with refrigeration systems and refrigerants is given in Appendix BB.
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