GB 8877-1988 Safety requirements for installation, use and maintenance of household electrical appliances
Some standard content:
National Standard of the People's Republic of China
Safety requirements for the installation and operation and maintenance of household electrical appliancesUDC 621. 3-7
GB 8877--88
In order to ensure the personal safety of users of household electrical appliances, it is necessary to put forward further requirements for a series of links such as the production, selection, sale, installation, use, maintenance and repair of household electrical appliances. The direct readers of this standard are relevant professionals. The guidance of household electrical appliance users is achieved by stipulating the contents of the instruction manual.
Scope of application
This standard is applicable to household electrical appliances and household electronic appliances used in the home. This standard does not apply to special places such as garages and appliances used in open or semi-open places. Household appliances used in bathrooms need to be specified separately. 2 Terms
The definitions of terms used in this standard are as follows: 2.1 Basic insulation
Insulation on live parts that provides basic protection against electric shock. 2.2 Supplementary insulation
Independent insulation used in addition to basic insulation to prevent electric shock in the event of damage to basic insulation. 2.3 Double insulation
Insulation that has both basic insulation and supplementary insulation. 2.4 Reinforced insulation
Independent insulation structure with a degree of protection equivalent to double insulation. NOTE: The term "insulating structure" does not mean that the insulation must be homogeneous. It may consist of several insulating layers that cannot be tested separately like basic insulation or supplementary insulation.
2.5 Live parts
Conductors or conductive parts that are energized during normal use, including neutral conductors, but by convention, excluding protective neutral conductors (PEN conductors).
NOTE: This term does not necessarily imply a risk of electric shock. 2.6 Exposed conductive parts
Conductive parts of electrical equipment that can be touched. It is not energized in normal conditions, but may be energized in the event of a fault. NOTE: Conductive parts of electrical equipment that can only be energized through exposed conductive parts in the event of a fault are not considered to be exposed conductive parts. 2.7 Electrical equipment
Any object for generating, transforming, transmitting, distributing or using electricity, such as milk motors, transformers, electrical appliances, measuring instruments, protection devices, equipment for wiring systems, and electrical appliances.
2.8 Electrical installation
Approved by the National Bureau of Standards on March 2, 1988
Implementation on October 1, 1988
GB 8877 -- 88
A combination of electrical equipment with matching characteristics to achieve one or more specific purposes. 2.9 External conductive parts
Conductive parts that are not part of the electrical installation and are easily introduced into the potential (usually the ground potential). 2.100 Class electrical appliances
Electric appliances that rely on basic insulation to prevent the risk of electric shock. It has no means of connection for grounding protection. 2.11 [Class electrical appliances
The protection against electric shock of this class of electrical appliances not only relies on basic insulation, but also requires an additional safety precaution. The method is to connect the exposed conductive parts of the appliance to the protective grounding conductor installed in the fixed line. 2.12 Class H appliances
This type of appliance not only relies on basic insulation but also has additional insulation for protection against electric shock. After the basic insulation is damaged, it relies on additional insulation for protection. The method is to use double insulation or reinforced insulation structure, without the need to connect protective wires or measures that rely on installation conditions.
2.13 Class I appliances
This type of appliance relies on safe voltage for protection against electric shock, and no voltage higher than the safe voltage is generated in any part of the appliance.
2.14 Mobile household appliances
Household appliances that can be moved while working or can be easily moved from one place to another when connected to the power supply. 2.15 Fixed household appliances
Household appliances that are used in a fixed manner or weigh more than 18kg and have no carrying handles. 2.16 Fixed-mounted household appliances
Household appliances that are fastened to a bracket or a specific position. 2.17 Instructions for use
is a tool composed of words, symbols, diagrams, tables, etc., which are used to convey product information and explain relevant issues to users.
Instructions for use include: instruction manual, instructions on the product or packaging, and explanatory labels (including nameplates). 2.18 Neutral conductor
A conductor connected to the neutral point of the system for transmitting electrical energy. Note: In some cases, the functions of the neutral conductor and the protective conductor can be combined under specified conditions and the same conductor can be used. 2.19 Protective conductor
A wire required by certain anti-electric shock protection measures to make electrical connections with any of the following parts. Exposed conductive parts;
External conductive parts;
Main grounding terminal;
Grounding electrode;
Power supply grounding point or artificial neutral point.
Note: The protective conductor is represented by the symbol PE and is distinguished by specified colors. 2.20 Protective neutral conductor (PEN conductor)
A grounding conductor that has both the functions of a neutral conductor and a protective conductor. Note: The abbreviation PEN is a combination of the symbol PE for protective conductor and the symbol N for neutral conductor. 2.21 Places without indirect contact danger
People in this place cannot touch the exposed conductive part of an electrical appliance and any external conductive part (including the ground and the wall) at the same time, nor can they touch the exposed conductive parts of two electrical appliances at the same time. Protective conductors are strictly prohibited in this place. 2.22 Professionals
People who have received professional education, have professional knowledge and experience, and can identify the electrical appliances they operate and use that may be dangerous. 524
3 Classification of household appliances
3.1 Classification by protection against electric shock
Class 0 appliances
Class 1 appliances
Class H appliances
Class I appliances
GB 8877-88
Note: The classification numbers are not used to reflect the safety level of the appliances, but only to reflect the means of achieving safety. 3.2 Classification by enclosure protection grade
For specific requirements of each grade, see the classification of enclosure protection grades in GB4208. The following grades are recommended for household appliances: IP20～IP24
IP30～IP34
IP41IP44
Note: See Appendix A for the code description of the above grades. 4 Reasonable selection of household appliances
4.1 Under normal room conditions, Class I, Class II and Class IIII appliances must be selected from the perspective of protection against electric shock, and appliances with a grade of not less than IP20 should be selected from the perspective of shell protection.
4.2 Class 0 appliances are only allowed in places where there is no danger of indirect electric contact. 4.3 In kitchens, toilets or similar places, Class I, Class II or Class II appliances must be selected from the perspective of protection against electric shock; appliances with a grade of not less than IP24 should be selected from the perspective of shell protection. 4.4 For appliances that come into direct contact with human skin and hair during use, Class II or Class III appliances must be selected from the perspective of protection against electric shock. 5 Sales of household appliances
5.1 Sales departments shall not purchase and sell household appliances that have not been tested and qualified by national or nationally recognized quality inspection departments. 5.2 The sale of household appliances with a warranty period must be carried out after the warranty unit is determined. 5.3 When selling household appliances, instruction manuals must be attached, and instruction manuals must be included in the inspection items of the quality inspection department. 5.4 The sales outlets for household electrical appliances shall be approved by the industrial and commercial administration departments and shall be subject to regular inspections. Sales personnel shall be familiar with and understand the performance indicators and usage requirements of household electrical appliances, and shall be able to fairly and correctly guide buyers to purchase household electrical appliances. 5.5 When applying for sales advertisements for household electrical appliances to radio stations, television stations, newspapers and other publicity media, a copy of the product certificate issued by the national or nationally recognized quality inspection department shall be submitted. The advertising undertaking department shall check whether the content of the advertisement is consistent with the product manual. 6 Installation of fixed household appliances
6.1 Fixed household appliances shall be installed by professionals. 6.20 Class fixed household appliances can only be installed in places where there is no danger of indirect contact. 6.31 The protective wire or protective wire terminal of fixed household appliances must be fixedly connected to the fixed protective conductor in the building, and plug-in method shall not be used. If the wire connection is made of different metals, measures to prevent electrochemical corrosion shall be taken. 6.4 Fixed household appliances that generate high temperatures during operation shall not be installed near combustibles. 7 Requirements for power supplies and electrical installations in buildings 7.1 The allowable deviation range of the power supply voltage of household appliances with a rated voltage of 220V is +5
%, and the allowable deviation range of the power supply voltage of household appliances with a rated voltage of 42V and below is ±10%. 7.2 Except for rooms where Class 1 appliances are not used now or in the future, or all rooms are places where there is no danger of indirect contact with electricity, the electrical lines in the building 525
GB887788
must be equipped with dedicated protective conductors. And the protective conductors and protective equipment (fuses, low-voltage circuit breakers, leakage current action protectors, etc.) must meet the corresponding provisions in the electrical engineering design standards. 7.3 The necessary number of power sockets should be set up in the building. In residential rooms of 10m2 and above, one socket position should be set on each of the two walls where household appliances are most likely to be used. In rooms of 2 to 10m, one socket position should be set (except for bathrooms). 7.4 In residential rooms, each socket position must allow users to use Class 1 or Class 1 household appliances at will. 7.5 Residences with Class 1II household appliances must be equipped with special sockets that comply with the provisions of GB1002 "Single-phase plug socket types, basic parameters and dimensions".
Residences with Class 1 household appliances that need to be used in multiple places should be equipped with a safe voltage power supply circuit that meets the electrical engineering design standards, and install the necessary number of special sockets in each place of use. Residences with only a few Class 2 household appliances should use a power supply device that integrates a safety isolation transformer, a special socket and a 220V plug that meets national standards. The 220V plug must not be separated from the transformer and the socket and then connected with a wire. 7.6 Class 2 household appliances must not be connected with a protective wire. 8 Use of household appliances wwW.bzxz.Net
8.1 The user of the appliance should read and understand the instruction manual in detail and use the appliance in accordance with the requirements of the instruction manual. 8.2 When using mobile appliances, the plug of the appliance must be fully inserted into a fixed power socket. 8.3 When it is necessary to plug several electrical appliances into one socket at the same time, a two-pin three-way plug or a socket converter that converts a three-hole socket into multiple sockets can be used, but the pins of the socket converter must be directly inserted into the fixed power socket. The number of sockets after conversion should not exceed four. After using a three-way or converter, the total rated current value of the connected electrical appliances should not exceed the rated current value of the original fixed socket. 8.4 The power supply to electrical appliances should not be drawn from the lamp head with a socket. 8.5 For electric heating appliances without automatic control, the power supply should be cut off when personnel leave the site and do not use the appliances. 8.6 For electrical appliances that can generate harmful radiation, personnel must maintain a safe distance specified in the manual from the working electrical appliances. 8.7 Electrical appliances that generate high temperatures during operation must not be placed near flammable items for use. 8.8 When an electrical appliance produces abnormal noise, odor or temperature, it should be stopped immediately. 8.9 Do not operate the switch of an electrical appliance or plug in or unplug the power plug with wet hands. 8.10 Non-professionals are not allowed to use tools to disassemble electrical appliances and change internal wiring. When unplugging the plug from the socket, hold the plug directly with your hand and do not apply tension to the power cord. 8.11
8.12 It is prohibited to replace the fuse with other metal wires other than the fuse. 8.13 When household appliances are only protected by fuses, they shall not be replaced with fuses larger than the original specifications. When household appliances are protected by low-voltage circuit breakers or leakage current operated protectors, their setting values shall not be changed without recalculation by professionals according to the anti-electric shock protection standards.
When household appliances do not have separate protection devices and all household appliances are protected by the total protection device of each household, the total protection device shall also comply with the requirements of this article.
9 Maintenance
9.1 In order to ensure the quality of maintenance, a strict maintenance system must be established, and the products after maintenance must meet the requirements of household appliance safety standards.
9.2 Units that repair household appliances must hold a "maintenance license", and unlicensed units are not allowed to engage in repair work. The "maintenance license" is issued by the quality supervision departments of various places. The conditions for issuance are as follows: the unit should have sufficient maintenance equipment, and the accuracy of the instruments and meters should meet the standard requirements. 8.
b. The technical person in charge of the unit must be a person who has passed the examination of the quality supervision department. 9.3 In order to ensure the quality of maintenance and clarify responsibilities, the repair unit must establish a repair registration card in duplicate (one copy for the repair unit and one for the user). The main contents of the repair registration card are:
Repair date;
Repair content;
Name and signature of the technical person in charge of the repair unit, warranty period.
GB8877-88
9.4 The repair unit of household appliances shall have a warranty period of at least three months after the repair of household appliances that have exceeded the manufacturer's warranty period. 9.5 The manufacturer must provide the repair unit with qualified spare parts and repair guides required for maintenance (at least including electrical circuit diagrams, disassembly and assembly methods, specifications and models of replaceable parts, etc.). The repair unit should promptly feedback product quality information to the manufacturer. 9.6 When repairing an electrical appliance during the manufacturer's warranty period, the repair unit shall not change the original design performance and parameters, nor shall it use substitute materials with performance lower than the original materials and parts that do not meet the original specifications. When repairing an electrical appliance beyond the manufacturer's warranty period, the original level of protection against electric shock and the level of enclosure protection must be maintained. 9.7 When repairing an electrical appliance, if insulation damage, cracked flexible cable or flexible wire sheath, falling off of the protective wire, cracking of plugs, sockets, switches and other electrical devices are found, they must be repaired proactively to eliminate the hidden dangers. 9.8 After repair, all household electrical appliances must be inspected for insulation resistance. For major repairs, a withstand voltage test must be performed. The insulation resistance value must meet the requirements of household electrical appliance safety standards. 527
GB 8877-88
Appendix A
Explanation of grade code
(Supplement)
A1 The code indicating the protection grade usually consists of the characteristic letter IP and two characteristic numbers. x
Second characteristic numeral
First characteristic numeral
Characteristic letters
The first characteristic numeral refers to the prevention of human body from touching or approaching the live parts inside the enclosure and touching the moving parts (except for smooth rotating shafts and similar parts), and preventing solid foreign objects from entering the enclosure. The second characteristic numeral refers to the prevention of water from entering the enclosure to a harmful degree. A2 The meaning of the characteristic numerals related to the recommended level of this standard is shown in the table below. The meaning of the first characteristic numeral
Can prevent solid foreign objects with a diameter greater than 12mm and a length not greater than 80mm from entering the enclosure.
Can prevent fingers from touching the live parts or moving parts inside the shell. Can prevent solid foreign objects with a diameter greater than 2.5mm from entering the shell.
Can prevent tools, metal wires, etc. with a thickness (or diameter) greater than 2.5mm from touching the live parts or moving parts inside the shell. Can prevent solid foreign objects with a diameter greater than 1mm from entering the shell. It can prevent tools, metal wires, etc. with a thickness (or diameter) greater than 1mm from touching the live parts or moving parts inside the shell. 528
Connotation of the second characteristic number
No special protection
No harmful effect from dripping water (vertical dripping water)
When the shell is tilted within 15° from the normal position, vertical dripping water will never have any harmful effect
No harmful effect from water within 60° from the vertical
No harmful effect from water splashing in any direction
Additional instructions:
GB 887788
This standard is proposed by the National Electrical Safety Standardization Technical Committee. It is under the jurisdiction of the Electrical Engineering Sub-Technical Committee.
This standard is drafted by the Beijing Household Appliance Research Institute of the Ministry of Light Industry, the Guangzhou Household Appliance Research Institute of the Ministry of Machinery Industry, the Design and Research Institute of the Ministry of Machinery Industry, the Production Department of the Ministry of Water Resources and Electric Power, the Shanghai Household Appliance Wholesale Company of the Ministry of Commerce, and the Standardization Institute of the Ministry of Electronics Industry. 529For residences with Class I household appliances, a safe voltage power supply circuit that meets the electrical engineering design standards should be set up, and a necessary number of special sockets should be installed in each place of use. Only for residences with individual Class II household appliances, a power supply device consisting of a safety isolation transformer, a special socket and a 220V plug that meets national standards should be used. The method of separating the 220V plug from the transformer and the socket and then connecting them with a wire should not be used. 7.6 Class II household appliances shall not be connected with a protective wire. 8 Use of household appliances
8.1 The user of the appliance should read and understand the instruction manual in detail and use the appliance in accordance with the requirements of the instruction manual. 8.2 When using mobile appliances, the plug of the appliance must be fully inserted into a fixed power socket. 8.3 When it is necessary to plug several electrical appliances into one socket at the same time, a two-pin three-way plug or a socket converter that converts a three-hole socket into multiple sockets can be used, but the pins of the socket converter must be directly inserted into the fixed power socket. The number of sockets after conversion should not exceed four. After using a three-way or converter, the total rated current value of the connected appliances should not exceed the rated current value of the original fixed socket. 8.4 The power supply to electrical appliances should not be connected from the socket lamp holder. 8.5 For electric heating appliances without automatic control, the power supply should be cut off when personnel leave the site and do not use the appliances. 8.6 For appliances that can generate harmful radiation, personnel must maintain the safety distance specified in the instructions from the operating appliances. 8.7 Appliances that generate high temperatures during operation must not be placed near flammable items. 8.8 When an appliance produces abnormal noise, odor or temperature, it should be stopped immediately. 8.9 Do not operate the switch of an appliance or plug in or unplug the power plug with wet hands. 8.10 Non-professionals are not allowed to use tools to disassemble appliances and change internal wiring. When unplugging the plug from the socket, hold the plug directly with your hand and do not apply tension to the power cord. 8.11
8.12 It is prohibited to replace the fuse with other metal wires other than the fuse. 8.13 When household appliances are only protected by fuses, they must not be replaced with fuses larger than the original specifications. When household appliances are protected by low-voltage circuit breakers or leakage current operated protectors, their setting values shall not be changed unless they are recalculated by professionals according to the protection standards for electric shock.
When household appliances do not have separate protection devices and all household appliances are protected by the total protection device of each household, the total protection device shall also comply with the requirements of this article.
9 Maintenance
9.1 In order to ensure the quality of maintenance, a strict maintenance system must be established, and the products after maintenance must meet the requirements of the safety standards for household appliances.
9.2 Units that repair household appliances must hold a "maintenance license", and units without a license are not allowed to engage in repair work. The "maintenance license" is issued by the quality supervision departments of various places, and the conditions for issuance are as follows: the unit should have sufficient maintenance equipment, and the accuracy of the instruments and meters should meet the standard requirements. 8.
b. The technical person in charge of the unit must be a person who has passed the examination of the quality supervision department. 9.3 In order to ensure the quality of maintenance and clarify responsibilities, the repair unit must establish a repair registration card in duplicate (one copy for the repair unit and one copy for the user). The main contents of the repair registration card are:
Repair date;
Repair content;
Name and signature of the technical person in charge of the repair unit, and warranty period.
GB8877-88
9.4 The repair unit of household appliances shall provide a warranty period of at least three months after the repair for household appliances that have exceeded the manufacturer's warranty period. 9.5 The manufacturer must provide the repair unit with qualified spare parts and repair guides required for repair (which should at least include electrical circuit diagrams, disassembly and assembly methods, specifications and models of replaceable parts, etc.). The repair unit shall promptly feedback product quality information to the manufacturer. 9.6 When repairing an appliance within the manufacturer's warranty period, the repair unit shall not change the original design performance and parameters, nor shall it use substitute materials with performance lower than the original materials and parts that do not meet the original specifications. When repairing an appliance that has exceeded the manufacturer's warranty period, the original level of protection against electric shock and the level of enclosure protection must be maintained. 9.7 When repairing electrical appliances, if insulation damage, cracked flexible cable or flexible wire sheath, falling off of protective wire, cracking of electrical devices such as plugs, sockets, switches, etc. are found, they must be repaired proactively to eliminate safety hazards. 9.8 After repair, all household electrical appliances must be inspected for insulation resistance. For major repairs, a withstand voltage test must be performed. The insulation resistance value must meet the requirements of household electrical appliance safety standards. 527
GB 8877—88
Appendix A
Explanation of grade code
(Supplement)
A1 The code indicating the protection grade usually consists of the characteristic letter IP and two characteristic numbers. x
Second characteristic number
First characteristic number
Characteristic letter
The first characteristic number refers to the prevention of human body from touching or approaching the live parts inside the shell and touching the moving parts (except smooth rotating shafts and similar parts), and preventing positive solid foreign objects from entering the shell. The second characteristic numeral refers to the prevention of water from entering the enclosure to a harmful degree. A2 The meaning of the characteristic numerals related to the recommended level of this standard is shown in the table below. The meaning of the first characteristic numeral
Can prevent solid foreign objects with a diameter greater than 12mm and a length not greater than 80mm from entering the enclosure.
Can prevent fingers from touching the live parts or moving parts in the enclosure. Can prevent solid foreign objects with a diameter greater than 2.5mm from entering the enclosure.
Can prevent tools, metal wires, etc. with a thickness (or diameter) greater than 2.5mm from touching the live parts or moving parts in the enclosure. Can prevent solid foreign objects with a diameter greater than 1mm from entering the enclosure. It can prevent tools, metal wires, etc. with a thickness (or diameter) greater than 1mm from touching the live parts or moving parts inside the shell. 528
Connotation of the second characteristic number
No special protection
No harmful effect from dripping water (vertical dripping water)
When the shell is tilted within 15° from the normal position, vertical dripping water will never have any harmful effect
No harmful effect from water within 60° from the vertical
No harmful effect from water splashing in any direction
Additional instructions:
GB 887788
This standard is proposed by the National Electrical Safety Standardization Technical Committee. It is under the jurisdiction of the Electrical Engineering Sub-Technical Committee.
This standard is drafted by the Beijing Household Appliance Research Institute of the Ministry of Light Industry, the Guangzhou Household Appliance Research Institute of the Ministry of Machinery Industry, the Design and Research Institute of the Ministry of Machinery Industry, the Production Department of the Ministry of Water Resources and Electric Power, the Shanghai Household Appliance Wholesale Company of the Ministry of Commerce, and the Standardization Institute of the Ministry of Electronics Industry. 529For residences with Class I household appliances, a safe voltage power supply circuit that meets the electrical engineering design standards should be set up, and a necessary number of special sockets should be installed in each place of use. Only for residences with individual Class II household appliances, a power supply device consisting of a safety isolation transformer, a special socket and a 220V plug that meets national standards should be used. The method of separating the 220V plug from the transformer and the socket and then connecting them with a wire should not be used. 7.6 Class II household appliances shall not be connected with a protective wire. 8 Use of household appliances
8.1 The user of the appliance should read and understand the instruction manual in detail and use the appliance in accordance with the requirements of the instruction manual. 8.2 When using mobile appliances, the plug of the appliance must be fully inserted into a fixed power socket. 8.3 When it is necessary to plug several electrical appliances into one socket at the same time, a two-pin three-way plug or a socket converter that converts a three-hole socket into multiple sockets can be used, but the pins of the socket converter must be directly inserted into the fixed power socket. The number of sockets after conversion should not exceed four. After using a three-way or converter, the total rated current value of the connected appliances should not exceed the rated current value of the original fixed socket. 8.4 The power supply to electrical appliances should not be connected from the socket lamp holder. 8.5 For electric heating appliances without automatic control, the power supply should be cut off when personnel leave the site and do not use the appliances. 8.6 For appliances that can generate harmful radiation, personnel must maintain the safety distance specified in the instructions from the operating appliances. 8.7 Appliances that generate high temperatures during operation must not be placed near flammable items. 8.8 When an appliance produces abnormal noise, odor or temperature, it should be stopped immediately. 8.9 Do not operate the switch of an appliance or plug in or unplug the power plug with wet hands. 8.10 Non-professionals are not allowed to use tools to disassemble appliances and change internal wiring. When unplugging the plug from the socket, hold the plug directly with your hand and do not apply tension to the power cord. 8.11
8.12 It is prohibited to replace the fuse with other metal wires other than the fuse. 8.13 When household appliances are only protected by fuses, they must not be replaced with fuses larger than the original specifications. When household appliances are protected by low-voltage circuit breakers or leakage current operated protectors, their setting values shall not be changed unless they are recalculated by professionals according to the protection standards for electric shock.
When household appliances do not have separate protection devices and all household appliances are protected by the total protection device of each household, the total protection device shall also comply with the requirements of this article.
9 Maintenance
9.1 In order to ensure the quality of maintenance, a strict maintenance system must be established, and the products after maintenance must meet the requirements of the safety standards for household appliances.
9.2 Units that repair household appliances must hold a "maintenance license", and units without a license are not allowed to engage in repair work. The "maintenance license" is issued by the quality supervision departments of various places, and the conditions for issuance are as follows: the unit should have sufficient maintenance equipment, and the accuracy of the instruments and meters should meet the standard requirements. 8.
b. The technical person in charge of the unit must be a person who has passed the examination of the quality supervision department. 9.3 In order to ensure the quality of maintenance and clarify responsibilities, the repair unit must establish a repair registration card in duplicate (one copy for the repair unit and one copy for the user). The main contents of the repair registration card are:
Repair date;
Repair content;
Name and signature of the technical person in charge of the repair unit, and warranty period.
GB8877-88
9.4 The repair unit of household appliances shall provide a warranty period of at least three months after the repair for household appliances that have exceeded the manufacturer's warranty period. 9.5 The manufacturer must provide the repair unit with qualified spare parts and repair guides required for repair (which should at least include electrical circuit diagrams, disassembly and assembly methods, specifications and models of replaceable parts, etc.). The repair unit shall promptly feedback product quality information to the manufacturer. 9.6 When repairing an appliance within the manufacturer's warranty period, the repair unit shall not change the original design performance and parameters, nor shall it use substitute materials with performance lower than the original materials and parts that do not meet the original specifications. When repairing an appliance that has exceeded the manufacturer's warranty period, the original level of protection against electric shock and the level of enclosure protection must be maintained. 9.7 When repairing electrical appliances, if insulation damage, cracked flexible cable or flexible wire sheath, falling off of protective wire, cracking of electrical devices such as plugs, sockets, switches, etc. are found, they must be repaired proactively to eliminate safety hazards. 9.8 After repair, all household electrical appliances must be inspected for insulation resistance. For major repairs, a withstand voltage test must be performed. The insulation resistance value must meet the requirements of household electrical appliance safety standards. 527
GB 8877—88
Appendix A
Explanation of grade code
(Supplement)
A1 The code indicating the protection grade usually consists of the characteristic letter IP and two characteristic numbers. x
Second characteristic number
First characteristic number
Characteristic letter
The first characteristic number refers to the prevention of human body from touching or approaching the live parts inside the shell and touching the moving parts (except smooth rotating shafts and similar parts), and preventing positive solid foreign objects from entering the shell. The second characteristic numeral refers to the prevention of water from entering the enclosure to a harmful degree. A2 The meaning of the characteristic numerals related to the recommended level of this standard is shown in the table below. The meaning of the first characteristic numeral
Can prevent solid foreign objects with a diameter greater than 12mm and a length not greater than 80mm from entering the enclosure.
Can prevent fingers from touching the live parts or moving parts in the enclosure. Can prevent solid foreign objects with a diameter greater than 2.5mm from entering the enclosure.
Can prevent tools, metal wires, etc. with a thickness (or diameter) greater than 2.5mm from touching the live parts or moving parts in the enclosure. Can prevent solid foreign objects with a diameter greater than 1mm from entering the enclosure. It can prevent tools, metal wires, etc. with a thickness (or diameter) greater than 1mm from touching the live parts or moving parts inside the shell. 528
Connotation of the second characteristic number
No special protection
No harmful effect from dripping water (vertical dripping water)
When the shell is tilted within 15° from the normal position, vertical dripping water will never have any harmful effect
No harmful effect from water within 60° from the vertical
No harmful effect from water splashing in any direction
Additional instructions:
GB 887788
This standard is proposed by the National Electrical Safety Standardization Technical Committee. It is under the jurisdiction of the Electrical Engineering Sub-Technical Committee.
This standard is drafted by the Beijing Household Appliance Research Institute of the Ministry of Light Industry, the Guangzhou Household Appliance Research Institute of the Ministry of Machinery Industry, the Design and Research Institute of the Ministry of Machinery Industry, the Production Department of the Ministry of Water Resources and Electric Power, the Shanghai Household Appliance Wholesale Company of the Ministry of Commerce, and the Standardization Institute of the Ministry of Electronics Industry. 5291 To ensure the quality of maintenance, a strict maintenance system must be established. After maintenance, the products must meet the requirements of household appliance safety standards.
9.2 Units that repair household appliances must hold a "maintenance license". Units without a license are not allowed to engage in repair work. "Maintenance licenses" are issued by local quality supervision departments. The conditions for issuance are as follows: the unit should have sufficient maintenance equipment and the accuracy of instruments and meters should meet the standard requirements. 8.
b. The technical person in charge of the unit must be a person who has passed the examination of the quality supervision department. 9.3 To ensure the quality of maintenance and clarify responsibilities, the repair unit must establish a repair registration card in duplicate (one copy for each of the repair unit and the user). The main contents of the repair registration card are:
Repair date;
Repair content;
Name and signature of the technical person in charge of the repair unit, and warranty period.
GB8877-88
9.4 Units that repair household appliances must have a warranty period of at least three months after repair for household appliances that have exceeded the manufacturer's warranty period. 9.5 The manufacturer must provide the repair unit with qualified spare parts and repair guides required for repair (at least including electrical circuit diagrams, disassembly and assembly methods, specifications and models of replaceable parts, etc.). The repair unit should promptly feedback product quality information to the manufacturer. 9.6 When repairing an electrical appliance during the manufacturer's warranty period, the repair unit shall not change the original design performance and parameters, nor shall it use substitute materials with performance lower than the original materials and parts that do not meet the original specifications. Repairs of electrical appliances beyond the manufacturer's warranty period must maintain the original level of protection against electric shock and enclosure protection level. 9.7 When repairing electrical appliances, if insulation damage, cracked flexible cable or flexible wire sheath, falling off of protective wire, cracking of electrical devices such as plugs, sockets, switches, etc. are found to affect safety, they must be repaired proactively to eliminate unsafe hazards. 9.8 After repair, all household electrical appliances must be inspected for insulation resistance. If a major overhaul is performed, a withstand voltage test must be performed. The insulation resistance value must meet the requirements of household electrical appliance safety standards. 527
GB 8877—88
Appendix A
Explanation of Grade Code
(Supplement)
A1 The code for indicating the degree of protection usually consists of the characteristic letter IP and two characteristic numbers. x
Second characteristic number
First characteristic number
Characteristic letter
The first characteristic number refers to preventing human body from touching or approaching the live parts inside the enclosure and touching the moving parts (except for smooth rotating shafts and similar parts), and preventing solid foreign objects from entering the enclosure. The second characteristic number refers to preventing water from entering the enclosure to a harmful degree. A2 The meaning of the characteristic numbers related to the recommended level of this standard is shown in the table below. The meaning of the first characteristic number
Can prevent solid foreign objects with a diameter greater than 12mm and a length not greater than 80mm from entering the enclosure.
Can prevent fingers from touching the live parts or moving parts inside the enclosure. Can prevent solid foreign objects with a diameter greater than 2.5mm from entering the enclosure.
It can prevent tools, metal wires, etc. with a thickness (or diameter) greater than 2.5mm from touching the live parts or moving parts in the shell. It can prevent solid foreign objects with a diameter greater than 1mm from entering the shell. It can prevent tools, metal wires, etc. with a thickness (or diameter) greater than 1mm from touching the live parts or moving parts in the shell. 528
Connotation of the second characteristic number
No special protection
Dripping water (vertical dripping water) has no harmful effect
When the shell is tilted within 15° from the normal position, vertical dripping has no harmful effect
Water within a 60° range from the vertical has no harmful effect
Splashing water in any direction has no harmful effect
Additional instructions:
GB 887788
This standard is proposed by the National Electrical Safety Standardization Technical Committee. It is under the jurisdiction of the Electrical Engineering Technical Committee.
This standard was drafted by the Beijing Household Appliance Research Institute of the Ministry of Light Industry, the Guangzhou Household Appliance Research Institute of the Ministry of Machinery Industry, the Design and Research Institute of the Ministry of Machinery Industry, the Production Department of the Ministry of Water Resources and Electric Power, the Shanghai Household Appliance Wholesale Company of the Ministry of Commerce, and the Standardization Institute of the Ministry of Electronics Industry.1 To ensure the quality of maintenance, a strict maintenance system must be established. After maintenance, the products must meet the requirements of household appliance safety standards.
9.2 Units that repair household appliances must hold a "maintenance license". Units without a license are not allowed to engage in repair work. "Maintenance licenses" are issued by local quality supervision departments. The conditions for issuance are as follows: the unit should have sufficient maintenance equipment and the accuracy of instruments and meters should meet the standard requirements. 8.
b. The technical person in charge of the unit must be a person who has passed the examination of the quality supervision department. 9.3 To ensure the quality of maintenance and clarify responsibilities, the repair unit must establish a repair registration card in duplicate (one copy for each of the repair unit and the user). The main contents of the repair registration card are:
Repair date;
Repair content;
Name and signature of the technical person in charge of the repair unit, and warranty period.
GB8877-88
9.4 Units that repair household appliances must have a warranty period of at least three months after repair for household appliances that have exceeded the manufacturer's warranty period. 9.5 The manufacturer must provide the repair unit with qualified spare parts and repair guides required for repair (at least including electrical circuit diagrams, disassembly and assembly methods, specifications and models of replaceable parts, etc.). The repair unit should promptly feedback product quality information to the manufacturer. 9.6 When repairing an electrical appliance during the manufacturer's warranty period, the repair unit shall not change the original design performance and parameters, nor shall it use substitute materials with performance lower than the original materials and parts that do not meet the original specifications. Repairs of electrical appliances beyond the manufacturer's warranty period must maintain the original level of protection against electric shock and enclosure protection level. 9.7 When repairing electrical appliances, if insulation damage, cracked flexible cable or flexible wire sheath, falling off of protective wire, cracking of electrical devices such as plugs, sockets, switches, etc. are found to affect safety, they must be repaired proactively to eliminate unsafe hazards. 9.8 After repair, all household electrical appliances must be inspected for insulation resistance. If a major overhaul is performed, a withstand voltage test must be performed. The insulation resistance value must meet the requirements of household electrical appliance safety standards. 527
GB 8877—88
Appendix A
Explanation of Grade Code
(Supplement)
A1 The code for indicating the degree of protection usually consists of the characteristic letter IP and two characteristic numbers. x
Second characteristic number
First characteristic number
Characteristic letter
The first characteristic number refers to preventing human body from touching or approaching the live parts inside the enclosure and touching the moving parts (except for smooth rotating shafts and similar parts), and preventing solid foreign objects from entering the enclosure. The second characteristic number refers to preventing water from entering the enclosure to a harmful degree. A2 The meaning of the characteristic numbers related to the recommended level of this standard is shown in the table below. The meaning of the first characteristic number
Can prevent solid foreign objects with a diameter greater than 12mm and a length not greater than 80mm from entering the enclosure.
Can prevent fingers from touching the live parts or moving parts inside the enclosure. Can prevent solid foreign objects with a diameter greater than 2.5mm from entering the enclosure.
It can prevent tools, metal wires, etc. with a thickness (or diameter) greater than 2.5mm from touching the live parts or moving parts in the shell. It can prevent solid foreign objects with a diameter greater than 1mm from entering the shell. It can prevent tools, metal wires, etc. with a thickness (or diameter) greater than 1mm from touching the live parts or moving parts in the shell. 528
Connotation of the second characteristic number
No special protection
Dripping water (vertical dripping water) has no harmful effect
When the shell is tilted within 15° from the normal position, vertical dripping has no harmful effect
Water within a 60° range from the vertical has no harmful effect
Splashing water in any direction has no harmful effect
Additional instructions:
GB 887788
This standard is proposed by the National Electrical Safety Standardization Technical Committee. It is under the jurisdiction of the Electrical Engineering Technical Committee.
This standard was drafted by the Beijing Household Appliance Research Institute of the Ministry of Light Industry, the Guangzhou Household Appliance Research Institute of the Ministry of Machinery Industry, the Design and Research Institute of the Ministry of Machinery Industry, the Production Department of the Ministry of Water Resources and Electric Power, the Shanghai Household Appliance Wholesale Company of the Ministry of Commerce, and the Standardization Institute of the Ministry of Electronics Industry.
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