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Position: Chinese Standard in English/GB/T 12501-1990
GB/T 12501-1990   Classification of electrical and electronic equipment with regard to protection against electric shock (English Version)
Standard No.: GB/T 12501-1990 Status:abolished remind me the status change

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Language:English File Format:PDF
Word Count: 1500 words Price(USD):184.0 remind me the price change

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Implemented on:1991-7-1 Delivery: via email in 1 business day
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Standard No.: GB/T 12501-1990
English Name: Classification of electrical and electronic equipment with regard to protection against electric shock
Chinese Name: 电工电子设备防触电保护分类
Professional Classification: GB    National Standard
Issued on: 1990-11-06
Implemented on: 1991-7-1
Status: abolished
Abolished on:2005-10-14
Language: English
File Format: PDF
Word Count: 1500 words
Price(USD): 184.0
Delivery: via email in 1 business day
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. Classification of Electrical and Electronic Equipment with regard to Protection against Electric Shock This standard was developed by reference to the international standard IEC 536 (1976) Classification of Electrical and Electronic Equipment with regard to Protection against Electric Shock. 1 Subject Content and Application Scope This standard specifies the classification and definition of low-voltage electrical and electronic equipment intended for connection to an external power supply, with regard to protection against electric shock in the event of an insulation failure. This standard is applicable to electrical and electronic equipment with rated voltage not exceeding 660V AC r.m.s. If necessary, there is possibility of using it for higher voltages and other purposes in the related standard. This standard is applicable to electrical and electronic equipment for use by the general public in homes, offices, workshops, schools, farms and the like, and for medical and dental purposes. This standard is applicable to open-type equipment, that is to say equipment itself not provided with the protection against contact with live parts. 2 Normative References GB 2900.1 Electrotechnical Terminology - Fundamental Terms GB 3805 Safety Voltage GB 4208 Degrees of Protection Provided by Enclosure GB 4776 Electrical Safety Terminology 3 Terms 3.1 basic insulation insulation applied to live parts to provide basic protection against electric shock 3.2 supplementary insulation independent insulation applied in addition to basic insulation in order to provide protection against electric shock in the event of a failure of basic insulation 3.3 double insulation insulation comprising both basic insulation and supplementary insulation 3.4 reinforced insulation a single insulation system provides a degree of protection against electric shock equivalent to double insulation Note: the term "insulation system" does not imply that the insulation must be one homogeneous piece. It may comprise several layers which cannot be tested singly as supplementary or basic insulation. 3.5 safety impedance an impedance connected between live parts and accessible conductive parts, of such value that the current, in normal use and under likely fault conditions in the equipment, is limited to a safe value, and which is so constructed that the reliability is maintained throughout the life of the equipment 3.6 safety extra-low voltage (SELV) a voltage which does not exceed 50V AC r.m.s. between conductors, or between any conductor and earth, in a circuit which is isolated from the supply mains by means such as a safety isolating transformer or converter with separate windings Notes: ① Limitation to SELV in different industries is specified in the related professional standard. ② See GB 3805 for the limitation to voltages when direct contact with live part is involved. ③ The voltage limit shall not be exceeded either at full load or no-load, but it is assumed, for the purpose of this definition, that any transformer or converter is operated at its rated supply voltage. 4 Classes of Equipment The class numbers are not intended to reflect the safety level of the equipment, but only the means by which the safety is obtained. According to this classification, the protection against electric shock is provided by surrounding environment, equipment itself or power supply system. See Table A1 of Annex A. Equipment protection not against electric shock is specified in other national standard, e.g. degree of protection provided by enclosure is detailed in GB 4208. 4.1 Class 0 equipment Equipment in which protection against electric shock only relies upon basic insulation; this implies that there are no means for the connection of accessible conductive parts, if any, to the protective (earthing) conductor in the fixed wiring of the installation, reliance in the event of a failure of the basic insulation being placed upon the environment. 4.2 Class I equipment Equipment in which protection against electric shock does not rely on basic insulation only, but which includes an additional safety precaution in such a way that means are provided for the connection of accessible conductive parts to the protective (earthing) conductor in the fixed wiring of the installation. Notes: ① For equipment intended for use with a flexible cord or cable, this provision includes a protective (earthing) conductor as part of the flexible cord or cable. ② Where relevant standards permits, any component is at least subject to basic insulation and equipped with earthing terminal, but the power cord is not equipped with earthing conductor and the plug is not equipped with earthing pin, so it cannot be introduced to the power socket with earthing contact, provided that the protective conductor is not connected with the protective (earthing) conductor in fixed wiring, the protection is then equivalent to that of Class 0, but the earthing provisions of the equipment in all other respects shall fully comply with the requirements of Class I.
1 Subject Content and Application Scope 2 Normative References 3 Terms 4 Classes of Equipment Annex A (Informative Reference) Table for Principal Characteristics of Equipment and Precautions for Safety Additional Explanation
Referred in GB/T 12501-1990:
*GB2900.1-
*GB3805-
*GB 4208-2008 Degrees of Protection Provided By Enclosure (IP Code)
*GB 4776-1984 Electrical safety terminology
*DL/T 1705-2017 Phosphate ester fire-resistant-determination of ageing-closed cup amethod
*DL/T 5003-2017 Code for design of dispatch automation in power system
*SH/T 3024-2017 Design Specification for Environmental Protection in Petrochemical Industry
*HG/T 20203-2017 Code for construction and acceptance of chemical machine installation engineering (General purpose requirement)
*WS 233-2017 General biosafety standard for causative bacteria laboratories
*GB/T 1596-2017 Fly ash used for cement and concrete
*GB 5009.26-2016 Determination of N-nitrosamines in foods
*GB 12695-2016 Good manufacturing practice for drink factory
*GB/T 15670.8-2017 Toxicological test methods for pesticides registration- Part 8:Acute eye irritation/corrosion test
*QJD 3147-2011 General Technical Specification for Packaging of Domestic Parts
GB/T 12501-1990 is referred in:
*GB/T 7321-2017 Sample preparation for testing of shaped refractory products
*GB 34330-2017 Identification standards for solid wastes General rules
*CQC11-463426-2017 Safety Certification Rules for Cables of Electric Vehicles Conductive Charging Systems
Code of China
Standard
GB/T 12501-1990  Classification of electrical and electronic equipment with regard to protection against electric shock (English Version)
Standard No.GB/T 12501-1990
Statusabolished
LanguageEnglish
File FormatPDF
Word Count1500 words
Price(USD)184.0
Implemented on1991-7-1
Deliveryvia email in 1 business day
Detail of GB/T 12501-1990
Standard No.
GB/T 12501-1990
English Name
Classification of electrical and electronic equipment with regard to protection against electric shock
Chinese Name
电工电子设备防触电保护分类
Chinese Classification
Professional Classification
GB
ICS Classification
Issued by
Issued on
1990-11-06
Implemented on
1991-7-1
Status
abolished
Superseded by
Superseded on
Abolished on
2005-10-14
Superseding
Language
English
File Format
PDF
Word Count
1500 words
Price(USD)
184.0
Keywords
GB/T 12501-1990, GB 12501-1990, GBT 12501-1990, GB/T12501-1990, GB/T 12501, GB/T12501, GB12501-1990, GB 12501, GB12501, GBT12501-1990, GBT 12501, GBT12501
Introduction of GB/T 12501-1990
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. Classification of Electrical and Electronic Equipment with regard to Protection against Electric Shock This standard was developed by reference to the international standard IEC 536 (1976) Classification of Electrical and Electronic Equipment with regard to Protection against Electric Shock. 1 Subject Content and Application Scope This standard specifies the classification and definition of low-voltage electrical and electronic equipment intended for connection to an external power supply, with regard to protection against electric shock in the event of an insulation failure. This standard is applicable to electrical and electronic equipment with rated voltage not exceeding 660V AC r.m.s. If necessary, there is possibility of using it for higher voltages and other purposes in the related standard. This standard is applicable to electrical and electronic equipment for use by the general public in homes, offices, workshops, schools, farms and the like, and for medical and dental purposes. This standard is applicable to open-type equipment, that is to say equipment itself not provided with the protection against contact with live parts. 2 Normative References GB 2900.1 Electrotechnical Terminology - Fundamental Terms GB 3805 Safety Voltage GB 4208 Degrees of Protection Provided by Enclosure GB 4776 Electrical Safety Terminology 3 Terms 3.1 basic insulation insulation applied to live parts to provide basic protection against electric shock 3.2 supplementary insulation independent insulation applied in addition to basic insulation in order to provide protection against electric shock in the event of a failure of basic insulation 3.3 double insulation insulation comprising both basic insulation and supplementary insulation 3.4 reinforced insulation a single insulation system provides a degree of protection against electric shock equivalent to double insulation Note: the term "insulation system" does not imply that the insulation must be one homogeneous piece. It may comprise several layers which cannot be tested singly as supplementary or basic insulation. 3.5 safety impedance an impedance connected between live parts and accessible conductive parts, of such value that the current, in normal use and under likely fault conditions in the equipment, is limited to a safe value, and which is so constructed that the reliability is maintained throughout the life of the equipment 3.6 safety extra-low voltage (SELV) a voltage which does not exceed 50V AC r.m.s. between conductors, or between any conductor and earth, in a circuit which is isolated from the supply mains by means such as a safety isolating transformer or converter with separate windings Notes: ① Limitation to SELV in different industries is specified in the related professional standard. ② See GB 3805 for the limitation to voltages when direct contact with live part is involved. ③ The voltage limit shall not be exceeded either at full load or no-load, but it is assumed, for the purpose of this definition, that any transformer or converter is operated at its rated supply voltage. 4 Classes of Equipment The class numbers are not intended to reflect the safety level of the equipment, but only the means by which the safety is obtained. According to this classification, the protection against electric shock is provided by surrounding environment, equipment itself or power supply system. See Table A1 of Annex A. Equipment protection not against electric shock is specified in other national standard, e.g. degree of protection provided by enclosure is detailed in GB 4208. 4.1 Class 0 equipment Equipment in which protection against electric shock only relies upon basic insulation; this implies that there are no means for the connection of accessible conductive parts, if any, to the protective (earthing) conductor in the fixed wiring of the installation, reliance in the event of a failure of the basic insulation being placed upon the environment. 4.2 Class I equipment Equipment in which protection against electric shock does not rely on basic insulation only, but which includes an additional safety precaution in such a way that means are provided for the connection of accessible conductive parts to the protective (earthing) conductor in the fixed wiring of the installation. Notes: ① For equipment intended for use with a flexible cord or cable, this provision includes a protective (earthing) conductor as part of the flexible cord or cable. ② Where relevant standards permits, any component is at least subject to basic insulation and equipped with earthing terminal, but the power cord is not equipped with earthing conductor and the plug is not equipped with earthing pin, so it cannot be introduced to the power socket with earthing contact, provided that the protective conductor is not connected with the protective (earthing) conductor in fixed wiring, the protection is then equivalent to that of Class 0, but the earthing provisions of the equipment in all other respects shall fully comply with the requirements of Class I.
Contents of GB/T 12501-1990
1 Subject Content and Application Scope 2 Normative References 3 Terms 4 Classes of Equipment Annex A (Informative Reference) Table for Principal Characteristics of Equipment and Precautions for Safety Additional Explanation
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Keywords:
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