This standard specifies the minimum requirements and general rules for marking the rated values ​​and other characteristics of electrical equipment, so that electrical equipment connected to any power supply can be correctly and safely selected and installed. GB 17285-1998 Safety requirements for marking the rated values ​​of electrical equipment GB17285-1998 standard download decompression password: www.bzxz.net

GB17285--1998
This standard is equivalent to IEC1293:1994 in terms of technical content. This standard is the basic standard for electrical safety. The technical content equivalent to IEC is conducive to the integration with international safety technology. Appendix A and Appendix B of IEC1293 are for reference. According to GB/T1.1, this standard classifies Appendix A and Appendix B as indicative appendices.
In view of the lack of standard basis for the two examples of "single-phase three-wire system with one phase conductor, one neutral conductor and one protective conductor" and "three-phase five-wire system with separate neutral conductor and protective conductor" in Appendix A of IEC1293. According to the classification method of IEC364-3 according to live conductors, this standard changes them in Appendix A to "single-phase two-wire system with one phase conductor, one neutral conductor and one protective conductor" and "three-phase four-wire system with separate neutral conductor and protective conductor". This standard is proposed by the Ministry of Labor of the People's Republic of China. This standard is under the jurisdiction of the Mechanical Science Research Institute of the Ministry of Machinery Industry. This standard was drafted by the Mechanical Science Research Institute of the Ministry of Machinery Industry. The main drafters of this standard are Li Shilin, Guo Ting and Yang Fu. 412
GB17285—1998
IEC Foreword
1) IEC (International Electrotechnical Commission) is composed of national electrotechnical committees (IEC National Committees) and is an international organization engaged in standardization. The purpose of IEC is to promote international cooperation on all issues of standardization in the fields of electrical and electronic engineering. IEC publishes international standards for this purpose and other activities. The work of standard formulation is entrusted to technical committees. Any national committee interested in this topic can participate in such formulation work. International, governmental and non-governmental organizations associated with IEC can also participate in such formulation. IEC and the International Organization for Standardization (ISO) work closely together under the terms of mutual agreement. 2) All national technical committees show special interest in the resolutions or agreements of formal documents prepared by IEC technical committees. The topics involved should reflect international consensus as much as possible. 3) They are published in the form of standards, technical reports or guidelines and are recommended for international use. In this sense, these resolutions or agreements have been accepted by the National Committees. 4) In order to promote international unification, the IEC National Committees agree to use IEC International Standards as clearly as possible in their national and regional standards. Any differences between the corresponding national and regional standards and IEC standards should be clearly stated in the corresponding national and regional standards.
5) IEC does not provide recognized marking procedures and cannot be responsible for any equipment claiming to comply with an IEC standard. International Standard IEC1293 was prepared by IEC Technical Committee 16 (Terminal Marking and Other Marking). This version of the standard is based on the following documents:
16(CO)75
Voting Report
16(CO)77
A full report on the vote in favor of this standard can be found in the voting report in the table above. Annexes A and B are for reference only.
National Standard of the People's Republic of China
Safety requirements for marking power supply ratings of electrical equipment
Marking of electrical equipment with ratings related to electrical supply-Safety requirements1Scope
GB17285—1998
idtIEC1293:1994
This standard specifies the minimum requirements (see Note 1) and general rules for marking the ratings and other characteristics of electrical equipment (see Note 2) so that electrical equipment connected to any power supply can be correctly and safely selected and installed. The purpose of this standard is to:
provide general requirements for marking the characteristics related to any power supply system, such as voltage, current, frequency and power; and to provide a unified method for marking the electrical ratings of products for each technical committee. The relevant technical committees may generally apply this basic safety standard when specifying the minimum requirements for marking the ratings of electrical equipment, accessories and components connected to any power supply. The relevant technical committees may specify some additional requirements for the marking of power supply characteristics. NOTE
1 For further marking, see ISO/IEC Guide 51 [1]. 2 For the definition of electrical equipment, see IEC50 (826). 2 Referenced standards
The following standards contain provisions that, through reference in this standard, constitute the provisions of this standard. At the time of publication of this standard, the versions indicated are valid. All standards are subject to revision and parties using this standard should investigate the possibility of using the latest versions of the following standards. GB156-93 Standard voltage (eqvIEC38:1983) GB3101--93 General principles for quantities, units and symbols (eqvISO31-0:1992) GB/T4026-92 General rules for the identification and use of alphanumeric systems for terminals and specific conductor terminals of electrical equipment (eqvIEC445:1988)
GB/T4728.2-1998 Graphical symbols for electrical schematics Part 2 Symbol elements, qualifiers and other commonly used symbols (eqvIEC 617-2:1983)
GB/T 5465.2-1996 Graphical symbols for electrical equipment (neqIEC 417:1973, Supplement G:1985, Supplement K:1991) IEC 27 Text symbols used in electrotechnical technology IEC 50 (826):1982 International Electrotechnical Vocabulary (IEV) Chapter 826 Electrical Installations in Buildings First Revision (1990) IEC 1082-1:1991 Preparation of electrical technical documents Part 1 - General requirements ISO 1000:1989 Recommendations for the use of SI units, their multiples and certain other units ISO 7000:1989 Graphical symbols for equipment Index and summary *For numbers in square brackets, refer to the bibliography in Appendix B. Approved by the State Administration of Technical Supervision on March 20, 1998 414
Implementation on January 1, 1999
3 Marking requirements
3.1 Basic requirements
GB17285-1998
Electrical equipment should be marked with electrical ratings in an appropriate manner, such as nameplates or labels. Such markings should be clearly visible, easy to read, and durable during the expected life of the equipment. Markings should not be set on parts that are intended to be removed. Except for housing parts that are temporarily removed during equipment installation and reassembled after installation (see Notes 1, 2 and 3). Some equipment requires input and output characteristics to be marked. In some cases, the markings of input and output characteristics are provided by the relevant technical committee.
Some electrical equipment can be designed to be used at more than one supply voltage or frequency; for some equipment, the user is required to make adjustments on the equipment so that it can be used on a power supply system with a given nominal voltage; some equipment is designed to work at several nominal voltages or within a certain voltage range without any adjustment. All of the above equipment needs to be marked accordingly. The details of the marking method should be specified by the relevant technical committee. The marking of the equipment should be consistent with the provisions of IEC1082-1 ​​for the preparation of electrical technical documents. The standard abbreviations specified in GB/T4026 or the standard graphic symbols specified in GB/T4728 and GB/T5465.2 or ISO7000 should be used as the marking of rated values.
Physical quantity instruments can be expressed in numerical values ​​and their decimal multiples and divisors, followed by the unit symbols specified in GB3101, IEC27 and ISO1000.
Dimensions and tolerances should be expressed in a way that is not easy to be misunderstood (see Note 4). NOTE
1 The material, form and location of the marking or any further requirements are the responsibility of the relevant technical committee. 2 Additional marking may be given on the packaging or in the equipment manual. 3 If durability testing of the marking is required, it shall be specified by the relevant product standard. 4 For examples, see Part 3 of the IEC/ISO Guidelines [2]. 3.2 Marking of electrical equipment characteristics
As specified in 3.1, the equipment shall be marked with rated values ​​and other characteristics related to any power supply. In order to ensure the correct and safe use of the equipment, the technical committees shall select the characteristics listed in 3.2 as required. Unnecessary ratings and other characteristics may be omitted.
For products that are too small to accommodate a rating plate, it is advisable to use color or other methods in accordance with the standards, or to use recognized code markings.
3.2.1 Characteristics of the power supply system
The equipment shall have the following characteristic markings of the power supply system to which it is connected: - Type of power supply system (AC, DC), see GB156, number of phase conductors (e.g. 1, 2, 3);
- Other specific conductors (e.g. N, M, PE, see GB/T4026); - Voltage consistent with the power supply system (see GB156). Capital letters without periods shall be used
Graphic symbols may be used instead of alphanumeric symbols in accordance with the provisions of GB/T5465.2. Examples of recommended application of these rules, as well as examples of application of the order of characteristic arrangement and slash separators \/\, are all shown in Appendix A Table A1. Single lines cannot be used as symbols to replace direct current (DC) markings (see Table 02-02-03 of GB/T4728.2). 3.2.2 Rated values ​​of equipment
- Rated voltage, volt (V);
- Rated frequency, hertz (Hz);
- Rated current, ampere (A);
GB 17285-1998
Rated input and/or output power, watt (W) or volt-ampere (VA). Standard multiple abbreviations are allowed, as shown in Table A1 of Appendix A. Note: The relevant technical committee may specify more characteristic markings, for example: - marking IP code L3 according to GB4208; marking equipment protection class against electric shock according to GB/T12501 [4]. 3.3 Order of rated values ​​and other characteristics
If it is necessary to follow the prescribed order or due to space limitations, such as the writing space is limited to one line, the following order is recommended: Characteristics of the power supply system (3.2.1)
Rated values ​​and unit symbols (3.2.2)
- Other characteristics.
Example: 3/N/PE/400/230V50Hz.
To avoid confusion, a horizontal line can be used to separate the vertically arranged ratings (see Table A1). 3.4 Expression of numerical values
Each mark shall consist of a numerical value and its unit symbol. The unit symbol may be omitted if it will not cause confusion. 3.4.1 Single value
Each rated value shall consist of:
a numerical value;
a unit symbol.
Example: 60kV.
3.4.2 Two or more numerical values
Equipment that requires manual adjustment during operation to apply to one of several input characteristic ratings shall be marked as follows: several numerical values ​​in sequence separated by slashes, and a unit symbol.
Example: 24/12/6 V.
For equipment with various voltages or frequencies that can automatically convert values, the capital letters AUTO should be immediately after the mark. The AUTO mark can be replaced by the following graphic symbols: Example:
ISO 7000-0017 @
230/110VAUTO
230/110v@
1 Switches or other selectors used to set different values ​​on electrical equipment should be clearly marked so that the set value can be clearly and unmistakably indicated. 2 It is recommended to use a descending numerical sequence.
3.4.3 Range of values ​​
For equipment with a certain range of rated values ​​(such as rated voltage), if it can be used within the specified upper and lower limits and their range without any adjustment, it should be marked with: - the upper and lower limits separated by three dots () or a hyphen (-); - the unit symbol.
Example 6 V.12 V
6 V-12 V
6·12 V
6—12 V
1 See 3.1 for consistency and continuity between equipment marking and documentation. 2 It is recommended to use an increasing numerical sequence.
4 Application
Examples of markings that comply with the requirements of Clause 3 are given in Table A1 of Annex A. Further applications should be derived from these examples. 417
DC current 10 A
AC current 1 kA
DC voltage 230 V
AC voltage 400 V
DC or AC voltage 250 V
DC voltage range 0 to 400 V
Single-phase two-wire system with two phase conductors 230 VGB 17285- 1998
Appendix A
(Suggestive appendix)
Example graphic symbol for rating marking of power supply for electrical equipment
- = 230 V
== 20-400 V
2 230V
Single-phase two-wire system with one phase conductor, one neutral conductor and one protective conductor230V50Hz
Single-phase three-wire system with two phase conductors and one neutral conductor220/110V, 60Hz
DC three-wire system220V
Three-phase three-wire system400V
Three-phase four-wire system with neutral conductor480/277VThree-phase four-wire system with separate neutral and protective conductors400/230VSmall accessories for AC voltage250V, 16ANote
The symbol PE is not used in the United States and Canada.
2The unit symbol can be omitted if it does not cause mixing slip. 418
1/N/PE
230V50Hz
(see note 1)
220/110V
2/M =-= 220V
3 400V
480/277V
3/N/PE
400/230V
(See Note 1)
(See Note 2)
250V16A
DC 230 V
AC400V
AV/DC 250 V
DC .*400 V
2AC230 V
1/N/PEAC
230V50Hz
(See Note 1)
220/110 V 60 Hz
2/M DC 220 V
3AC400 V
480/277V
3/N/PEAC
400/230V
(See Note 1)
(See Note 2)
or AC250V16A
Current type
DC or AC
Terminal connection
Neutral conductor
Protective conductor
Equipment category
—Class 1
1)Symbol in GB/T5465.2.
2) Letter symbols in GB/T4026.
GB17285-1998
Table A2 Examples of letter codes and graphic symbols
Appendix B
(Suggestive Appendix)
［1］ISO/IEC Guide 51:1990 Guidelines for standards including safety content ISO/IEC Guide Part 3:1989 Drafting and presentation of international standards [2]
Graphic symbols 1)
IEC number
IEC529:1989
Degrees of protection provided by enclosures (IP code) (adopted by my country as GB4208-93) [4]IEC536:1976
Classification of protection against electric shock of electrical and electronic equipment (adopted by my country as GB/T12501--90) 4192)
- Other characteristics.
Example: 3/N/PE/400/230V50Hz.
To avoid confusion, a horizontal line can be used to separate the vertically arranged ratings (see Table A1). 3.4 Expression of numerical values ​​
Each mark shall consist of a numerical value and its unit symbol. The unit symbol may be omitted if it will not cause confusion. 3.4.1 Single value
Each rated value shall consist of:
a numerical value;
a unit symbol.
Example: 60kV.
3.4.2 Two or more numerical values ​​
Equipment that requires manual adjustment during operation to apply to one of several input characteristic ratings shall be marked as follows: several numerical values ​​separated by slashes in order, and unit symbol.
Example: 24/12/6 V.
For equipment with various voltages or frequencies that can automatically convert values, the capital letters AUTO should be immediately after the mark. The AUTO mark can be replaced by the following graphic symbols: Example:
ISO 7000-0017 @
230/110VAUTO
230/110v@
1 Switches or other selectors used to set different values ​​on electrical equipment should be clearly marked so that the set value can be clearly and unmistakably indicated. 2 It is recommended to use a descending numerical sequence.
3.4.3 Range of values ​​
For equipment with a certain range of rated values ​​(such as rated voltage), if it can be used within the specified upper and lower limits and their range without any adjustment, it should be marked with: - the upper and lower limits separated by three dots () or a hyphen (-); - the unit symbol.
Example 6 V.12 V
6 V-12 V
6·12 V
6—12 V
1 See 3.1 for consistency and continuity between equipment marking and documentation. 2 It is recommended to use an increasing numerical sequence.
4 Application
Examples of markings that comply with the requirements of Clause 3 are given in Table A1 of Annex A. Further applications should be derived from these examples. 417
DC current 10 A
AC current 1 kA
DC voltage 230 V
AC voltage 400 V
DC or AC voltage 250 V
DC voltage range 0 to 400 V
Single-phase two-wire system with two phase conductors 230 VGB 17285- 1998
Appendix A
(Suggestive appendix)
Example graphic symbol for rating marking of power supply for electrical equipment
- = 230 V
== 20-400 V
2 230V
Single-phase two-wire system with one phase conductor, one neutral conductor and one protective conductor230V50Hz
Single-phase three-wire system with two phase conductors and one neutral conductor220/110V, 60Hz
DC three-wire system220V
Three-phase three-wire system400V
Three-phase four-wire system with neutral conductor480/277VThree-phase four-wire system with separate neutral and protective conductors400/230VSmall accessories for AC voltage250V, 16ANote
The symbol PE is not used in the United States and Canada.
2The unit symbol can be omitted if it does not cause mixing slip. 418
1/N/PE
230V50Hz
(see note 1)
220/110V
2/M =-= 220V
3 400V
480/277V
3/N/PE
400/230V
(See Note 1)
(See Note 2)
250V16A
DC 230 V
AC400V
AV/DC 250 V
DC .*400 V
2AC230 V
1/N/PEAC
230V50Hz
(See Note 1)
220/110 V 60 Hz
2/M DC 220 V
3AC400 V
480/277V
3/N/PEAC
400/230V
(See Note 1)
(See Note 2)
or AC250V16A
Current type
DC or AC
Terminal connection
Neutral conductor
Protective conductor
Equipment category
—Class 1
1)Symbol in GB/T5465.2.
2) Letter symbols in GB/T4026.
GB17285-1998
Table A2 Examples of letter codes and graphic symbols
Appendix B
(Suggestive Appendix)
［1］ISO/IEC Guide 51:1990 Guidelines for standards including safety content ISO/IEC Guide Part 3:1989 Drafting and presentation of international standards [2]
Graphic symbols 1)
IEC number
IEC529:1989
Degrees of protection provided by enclosures (IP code) (adopted by my country as GB4208-93) [4]IEC536:1976
Classification of protection against electric shock of electrical and electronic equipment (adopted by my country as GB/T12501--90) 4192)
- Other characteristics.
Example: 3/N/PE/400/230V50Hz.
To avoid confusion, a horizontal line can be used to separate the vertically arranged ratings (see Table A1). 3.4 Expression of numerical values ​​
Each mark shall consist of a numerical value and its unit symbol. The unit symbol may be omitted if it will not cause confusion. 3.4.1 Single value
Each rated value shall consist of:
a numerical value;
a unit symbol.
Example: 60kV.
3.4.2 Two or more numerical values ​​
Equipment that requires manual adjustment during operation to apply to one of several input characteristic ratings shall be marked as follows: several numerical values ​​separated by slashes in order, and unit symbol.
Example: 24/12/6 V.
For equipment with various voltages or frequencies that can automatically convert values, the capital letters AUTO should be immediately after the mark. The AUTO mark can be replaced by the following graphic symbols: Example:
ISO 7000-0017 @
230/110VAUTO
230/110v@
1 Switches or other selectors used to set different values ​​on electrical equipment should be clearly marked so that the set value can be clearly and unmistakably indicated. 2 It is recommended to use a descending numerical sequence.
3.4.3 Range of values ​​
For equipment with a certain range of rated values ​​(such as rated voltage), if it can be used within the specified upper and lower limits and their range without any adjustment, it should be marked with: - the upper and lower limits separated by three dots () or a hyphen (-); - the unit symbol.
Example 6 V.12 V
6 V-12 V
6·12 V
6—12 V
1 See 3.1 for consistency and continuity between equipment marking and documentation. 2 It is recommended to use an increasing numerical sequence.
4 Application
Examples of markings that comply with the requirements of Clause 3 are given in Table A1 of Annex A. Further applications should be derived from these examples. 417
DC current 10 A
AC current 1 kA
DC voltage 230 V
AC voltage 400 V
DC or AC voltage 250 V
DC voltage range 0 to 400 V
Single-phase two-wire system with two phase conductors 230 VGB 17285- 1998
Appendix A
(Suggestive appendix)
Example graphic symbol for rating marking of power supply for electrical equipment
- = 230 V
== 20-400 V
2 230V
Single-phase two-wire system with one phase conductor, one neutral conductor and one protective conductor230V50Hz
Single-phase three-wire system with two phase conductors and one neutral conductor220/110V, 60Hz
DC three-wire system220V
Three-phase three-wire system400V
Three-phase four-wire system with neutral conductor480/277VThree-phase four-wire system with separate neutral and protective conductors400/230VSmall accessories for AC voltage250V, 16ANote
The symbol PE is not used in the United States and Canada.
2The unit symbol can be omitted if it does not cause mixing slip. 418
1/N/PE
230V50Hz
(see note 1)
220/110V
2/M =-= 220V
3 400V
480/277V
3/N/PE
400/230V
(See Note 1)
(See Note 2)
250V16A
DC 230 V
AC400V
AV/DC 250 V
DC .*400 V
2AC230 V
1/N/PEAC
230V50Hz
(See Note 1)
220/110 V 60 Hz
2/M DC 220 V
3AC400 V
480/277V
3/N/PEAC
400/230V
(See Note 1)
(See Note 2)
or AC250V16A
Current type
DC or AC
Terminal connection
Neutral conductor
Protective conductor
Equipment category
—Class 1
1)Symbol in GB/T5465.2.
2) Letter symbols in GB/T4026.
GB17285-1998
Table A2 Examples of letter codes and graphic symbols
Appendix B
(Suggestive Appendix)
［1］ISO/IEC Guide 51:1990 Guidelines for standards including safety content ISO/IEC Guide Part 3:1989 Drafting and presentation of international standards [2]
Graphic symbols 1)
IEC number
IEC529:1989
Degrees of protection provided by enclosures (IP code) (adopted by my country as GB4208-93) [4]IEC536:1976
Classification of protection against electric shock of electrical and electronic equipment (adopted by my country as GB/T12501--90) 4191. Consistency and continuity between marking and documentation on equipment. 2. The use of increasing numerical order is recommended.
4. Application
Examples of markings that meet the requirements of Chapter 3 are given in Table A1 of Appendix A. Further applications should be derived from these examples. 417
DC current 10 A
AC current 1 kA
DC voltage 230 V
AC voltage 400 V
DC or AC voltage 250 V
DC voltage range 0 to 400 V
Single-phase two-wire system with two phase conductors 230 VGB 17285- 1998
Appendix A
(Suggestive appendix)
Example graphic symbol for rating marking of power supply for electrical equipment
- = 230 V
== 20-400 V
2 230V
Single-phase two-wire system with one phase conductor, one neutral conductor and one protective conductor230V50Hz
Single-phase three-wire system with two phase conductors and one neutral conductor220/110V, 60Hz
DC three-wire system220V
Three-phase three-wire system400V
Three-phase four-wire system with neutral conductor480/277VThree-phase four-wire system with separate neutral and protective conductors400/230VSmall accessories for AC voltage250V, 16ANote
The symbol PE is not used in the United States and Canada.
2The unit symbol can be omitted if it does not cause mixing slip. 418
1/N/PE
230V50Hz
(see note 1)
220/110V
2/M =-= 220V
3 400V
480/277V
3/N/PE
400/230V
(See Note 1)
(See Note 2)
250V16A
DC 230 V
AC400V
AV/DC 250 V
DC .*400 V
2AC230 V
1/N/PEAC
230V50Hz
(See Note 1)
220/110 V 60 Hz
2/M DC 220 V
3AC400 V
480/277V
3/N/PEAC
400/230V
(See Note 1)
(See Note 2)
or AC250V16A
Current type
DC or AC
Terminal connection
Neutral conductor
Protective conductor
Equipment category
—Class 1
1)Symbol in GB/T5465.2.
2) Letter symbols in GB/T4026.
GB17285-1998
Table A2 Examples of letter codes and graphic symbols
Appendix B
(Suggestive Appendix)
［1］ISO/IEC Guide 51:1990 Guidelines for standards including safety content ISO/IEC Guide Part 3:1989 Drafting and presentation of international standards [2]
Graphic symbols 1)
IEC number
IEC529:1989
Degrees of protection provided by enclosures (IP code) (adopted by my country as GB4208-93) [4]IEC536:1976
Classification of protection against electric shock of electrical and electronic equipment (adopted by my country as GB/T12501--90) 4191. Consistency and continuity between marking and documentation on equipment. 2. The use of increasing numerical order is recommended.
4. Application
Examples of markings that meet the requirements of Chapter 3 are given in Table A1 of Appendix A. Further applications should be derived from these examples. 417
DC current 10 A
AC current 1 kA
DC voltage 230 V
AC voltage 400 V
DC or AC voltage 250 V
DC voltage range 0 to 400 V
Single-phase two-wire system with two phase conductors 230 VGB 17285- 1998
Appendix A
(Suggestive appendix)
Example graphic symbol for rating marking of power supply for electrical equipment
- = 230 V
== 20-400 V
2 230V
Single-phase two-wire system with one phase conductor, one neutral conductor and one protective conductor230V50Hz
Single-phase three-wire system with two phase conductors and one neutral conductor220/110V, 60Hz
DC three-wire system220V
Three-phase three-wire system400V
Three-phase four-wire system with neutral conductor480/277VThree-phase four-wire system with separate neutral and protective conductors400/230VSmall accessories for AC voltage250V, 16ANote
The symbol PE is not used in the United States and Canada.
2The unit symbol can be omitted if it does not cause mixing slip. 418
1/N/PE
230V50Hz
(see note 1)
220/110V
2/M =-= 220V
3 400V
480/277V
3/N/PE
400/230V
(See Note 1)
(See Note 2)
250V16A
DC 230 V
AC400V
AV/DC 250 V
DC .*400 V
2AC230 V
1/N/PEAC
230V50Hz
(See Note 1)
220/110 V 60 Hz
2/M DC 220 V
3AC400 V
480/277V
3/N/PEAC
400/230V
(See Note 1)wwW.bzxz.Net
(See Note 2)
or AC250V16A
Current type
DC or AC
Terminal connection
Neutral conductor
Protective conductor
Equipment category
—Class 1
1)Symbol in GB/T5465.2.
2) Letter symbols in GB/T4026.
GB17285-1998
Table A2 Examples of letter codes and graphic symbols
Appendix B
(Suggestive Appendix)
［1］ISO/IEC Guide 51:1990 Guidelines for standards including safety content ISO/IEC Guide Part 3:1989 Drafting and presentation of international standards [2]
Graphic symbols 1)
IEC number
IEC529:1989
Degrees of protection provided by enclosures (IP code) (adopted by my country as GB4208-93) [4]IEC536:1976
Classification of protection against electric shock of electrical and electronic equipment (adopted by my country as GB/T12501--90) 419
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