GB 4706.55-2002 Particular requirements for safety insulation panels and similar appliances for household and similar electrical appliances
Some standard content:
ICS 97.040.50
National Standard of the People's Republic of China
GB 4706.55-2002/1EC 60335-2-12:1992 Safety of household and similar electrical appliances-Particular requirements for warming plates and similar appliances (IEC 60335-2-12:1992, IDT)
Promulgated on November 29, 2002
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
Implementation on August 1, 2003
All technical contents of this part are mandatory. Previous
GB 4706.55—2002/1EC 60335-2-12:1992 This part is equivalent to IEC60335-2-12:1992 "Safety of household and similar electrical appliances Part 2: Particular requirements for insulation panels and similar appliances". This part is used in conjunction with GB4706.1-1998 "Safety of household and similar electrical appliances Part 1: General requirements".
The part of this part marked with "applicable" indicates that the corresponding clauses in GB4706.1-1998 apply to this part: the part of this part marked with "replace" or "modify" is subject to this part: the part of this part marked with "addition" indicates that the clauses of this part are added to the corresponding clauses in GB4706.1-1998.
This part is proposed by China Light Industry Federation. This part is under the jurisdiction of the National Technical Committee for Standardization of Household Electrical Appliances. The main reform unit of this part: Shenzhen Exit-Entry Inspection and Quarantine Bureau of the People's Republic of China. The main drafters of this part: Xie Jinxiong, Xu Beibei, Liu Zehua, Bi Kaijun, Li Huaqing. GB 4706. 55- 2002/IEC 60335-2-12:1992IEC Preface
1. IEC (International Electrotechnical Commission) is an international standardization organization composed of all national electrotechnical committees (IEC National Committees); its purpose is to promote international cooperation on standardization issues in the electrical and electronic fields. To this end, IEC carries out international standardization activities and publishes international standards. The formulation of these standards is entrusted to technical committees, and any IEC National Committee interested in the work can participate in the formulation work. International, governmental and non-governmental organizations associated with IEC can also participate in this work. IEC and the International Organization for Standardization (ISO) work closely together on the basis of mutual agreement. 2. Formal resolutions or agreements of IEC on technical issues formulated by technical committees in which all national committees with a special interest in the issue participate, represent as far as possible the international consensus on the issues involved. 3. These formal resolutions or agreements are published in the form of standards, technical reports or guidelines, recommended for international adoption, and accepted by the National Committees as such.
4. In order to achieve international consensus, IEC National Committees are committed to using IEC International Standards to the greatest extent possible in their national and regional standards. IEC Standards Differences between a standard and the corresponding national or regional standard shall be clearly indicated in the latter. 5. IEC has not established a procedure for the application of the approval mark. IEC assumes no responsibility for claims that a device complies with an IEC standard.
This standard was prepared by IEC Technical Committee 61 (Safety of Household and Similar Electrical Appliances). This standard is the fourth edition of 1EC60335-2-12 and replaces the third edition. This standard is based on the following documents:
61(CO)743
Voting Report
61(CO)752
All material concerning the vote on the adoption of this standard can be found in the voting report shown above. This standard is based on 1EC 60335-1, third edition (1991), should be used in conjunction with the latest edition of IEC 60335-1 and its supplements. This standard supplements or modifies the corresponding clauses in IEC 60335-1, thereby converting it into the IEC standard: Safety requirements for guardrails and similar apparatus.
The clauses of IEC 60335-1 not covered in this standard apply where reasonable. If "addition", "modification" or "modification" is marked in this standard, the relevant clauses of IEC60335-1 shall be modified accordingly. Note 1: The following typographical fonts are used in this standard: Requirements, Roman font; Test methods: Italic; Boldface Roman font. Boldface fonts are defined in Chapter 2. Note 2: The clauses and diagrams added to IEC60335-1 are numbered starting from 101. The following differences exist in some countries: - Chapter 3: It is not allowed to use direct current components on the neutral line of the appliance (Australia) - 7.12: If the appliance is equipped with a connector for installing a thermostat, this should be stated on the appliance (USA). 1 Scope GB 4706. 55-2002/1EC 60335-2-12:1992 Safety of household and similar electrical appliances
Particular requirements for warming boards and similar appliances
This chapter in GB 4706.1-1998 is replaced by the following. This standard deals with the safety of warming boards, warming dishes and similar appliances for household and similar purposes, with a rated voltage not exceeding 250V, used to keep food or containers warm.
Appliances that are not intended for general household use but may still constitute a source of danger to the public, for example, appliances intended for use by lay persons in shops, in light industry and on farms, are within the scope of this standard. As far as practical, this standard deals with common hazards arising from appliances encountered by all persons in and around the home. This standard generally does not take into account the following situations:
- Use of appliances by unattended young children and disabled persons: - Use of appliances by young children
NOTE 1: Attention should be paid to the following:
For appliances intended for use in vehicles, ships or aircraft, additional requirements may be necessary; -For appliances intended for use in tropical countries, special requirements may be necessary. -In many countries, additional requirements are prescribed by national health departments, departments responsible for labor protection and similar departments. 2: This standard does not apply to:
Appliances made of flexible materials such as textiles; -Appliances intended for use in special places, such as in the presence of corrosive or explosive atmospheres (dust, steam or gas); -Appliances specially designed for commercial or industrial use. NOTE 3: In the IEC 6001-1 for commercial appliances, the following requirements are specified:
For appliances intended for use in vehicles, ships or aircraft, additional requirements may be necessary; -For appliances intended for use in tropical countries, special requirements may be required. -In many countries, additional requirements are prescribed by national health departments, departments responsible for labor protection and similar departments. 2: This standard does not apply to:
Appliances made of flexible materials such as textiles; -Appliances intended for use in special places, such as in the presence of corrosive or explosive atmospheres (dust, steam or gas); -Appliances specially designed for commercial or industrial use. NOTE 3: In the IEC 6001-1 for commercial appliances, the following requirements are specified: Before the publication of the standard, this part can be used as a guide to appropriate requirements and tests for such appliances. 2 Definitions
This clause in GB 4706.1-1998 is applicable except for the following. 2.2.9 This clause is replaced by the following:
Normal operation
The appliance is operated with or without a container placed on the heating surface, whichever is the more unfavorable. A shallow pan with a diameter of 15 cm is filled with water to a height of at least 25 mm. However, if a container is provided with the appliance or specified in the instructions for use, this container shall be used. 2.2.101
Warming plate
An appliance on which food or containers can be placed on the heating surface. The appliance is intended to keep food or containers at a temperature suitable for use. In the past: A warming plate may also be called a warming plate.
3 General requirements
The contents of this clause in GB 4706.1-1998 are applicable. GB4706.55—2002/1EC 60335-2-12:19924 Test conditions
This chapter of GB4706.1-1998 is applicable except for the following contents. 4.2 This clause adds the following contents:
For appliances intended to be partially or fully immersed in water for cleaning, three additional appliances are required to carry out the test of 15.101. 5 Blank chapter
6 Classification
The contents of this chapter of GB4706.1—1998 are applicable. 7 Marking and instructions
This chapter of GB4706.1—1998 is applicable except for the following contents. 7.1 This clause adds the following contents:
Appliances intended to be partially immersed in water for cleaning should be marked with the deepest immersion level and the following contents should be marked: This line should not be exceeded when immersed.bzxZ.net
7.12 The following content is added to this clause:
If the appliance is equipped with an input socket and is intended to be partially or completely immersed in water for cleaning, its instructions should indicate that the connector should be unplugged before cleaning the appliance, and the input socket should be wiped dry before the appliance is reused. If the appliance is used with a connector equipped with a thermostat, its instructions should specify that only suitable connectors can be used. If the appliance has a surface of glass, ceramic or similar fragile material, and this surface forms part of the enclosure of live parts, its instructions should have the following warning content:
Warning: If the surface is broken, the appliance must not be used. If the insulation board must be used with a specific container and the container is not provided with the appliance, the instructions should specify the container to be used. 8 Protection against touching live parts
The contents of this chapter in GB4706.1-1998 are all applicable. 9 Starting of electric boat equipment
The contents of this chapter in GB4706.1-1998 are not applicable. 10 Input power and current
The contents of this chapter in GB4706.1-1998 are applicable. 11 Heat
This chapter in GB4706.1-1998 is applicable except for the following contents. 11.2 The following changes are made to this clause:
The portable appliance is placed away from the test corner wall. 11.7 This clause is replaced by the following content;
The appliance is operated until a steady state is established.
11.8 The following content is added to this clause:
If the appliance connector is equipped with a thermostat, the temperature rise limit of the pins of the input socket is not applicable. 12 Blank
13 Leakage current and electrical strength under operating conditions This chapter in GB4706.1-1998 is applicable except for the following contents. 13.2 This clause adds the following content:
GB 4706. 55—2002/IEC 60335-2-12:1992 For insulation boards that must use a specific metal container, the container is placed on the heating surface and connected to the accessible metal parts. The metal box should not be in contact with the accessible heating surface. For other appliances, the metal box is in contact with the accessible surface of the insulating material. The container is not placed on the heating surface. 14 Blank Chapter
15 Moisture resistance
This chapter in GB 4706.1—1998 is applicable except for the following content. 15.2 This clause adds the following content:
For appliances without containers, 0.01L of water is poured steadily on the surface within 1min for every 100cm of heating surface area.
Note: This test is not performed on appliances used only for heating. 15.101 Appliances intended to be partially or completely immersed in water for cleaning shall be adequately protected against the effects of immersion. Compliance is checked by the following test, which shall be made on three other appliances. The appliance is operated normally at 1,15 times the rated input power until the thermostat operates for the first time. Appliances without a thermostat are operated until steady conditions are established.
After the appliance has been completely immersed in water at a temperature of 10 °C to 25 °C, the appliance shall be immersed to the maximum immersion level, if the appliance is marked with that level. After 1 h, the appliance is removed from the water, wiped dry and subjected to the leakage current test of 16.2. NOTE Care shall be taken to ensure that any moisture is removed from the insulation surrounding the input pins of the appliance. This test is repeated four times and the appliance is then subjected to the electric strength test of 16.3 with the test voltage reduced to 1 000 V. The appliance with the largest leakage current after the fifth flooding is disassembled for visual inspection. No water marks that could cause the creepage distance and electrical clearance to be reduced to less than the limit values specified in 29.1 should appear on the insulation. The other two appliances are operated for 240 h under normal working conditions. After the test, the connectors of the two appliances are unplugged or the power supply is cut off by other means. The initial test is repeated. The appliances are then subjected to the electrical strength test of 16.3 with the test voltage reduced to 1000. Visual inspection should show that there are no water marks on the insulation that could cause the creepage distance and electrical clearance to be reduced to less than the limit values specified in 29.1. 16 Leakage current and electrical strength
The contents of this chapter in GB 4706.1-1998 are applicable. 17 Overload protection of transformers and related circuits The contents of this chapter in GB 4706.1-1998 are applicable. 18 Durability
The contents of this chapter in GB 4706. 1-1998 are not applicable. GB 4706.552002/1EC 60335-2-12:199219 Abnormal operation
This chapter in GB4706.1-1998 is applicable except for the following contents: 19.1 This clause is modified as follows:
The appliance is not subjected to the tests of 19.2 and 19.3, but to the test of 19.101. 19.101 The appliance is operated for 7 h at rated power input and with the hot surface fully covered. The covering consists of a felt strip with a width of 100 mm lined with a single layer of fabric. The mass density of the felt is 4 kg/m ± 0.4 kg/m, and the thickness is about 25 mm. The fabric is a pre-washed double-layer rolled cotton cloth with a dry mass density of 140 g/m ~ 175 g/m.
If the controller is activated, the test is repeated under the condition that the 1/3 heating surface farthest from the temperature sensing element is covered. 20 Stability and mechanical hazards
The contents of this chapter in GB4706.1-1998 are applicable. 21 Mechanical strength
Except for the following contents, the contents of this chapter in GB 4706.1-1998 are applicable. 21.1 The following contents are added to this clause
If the appliance has a surface of glass, ceramic or similar brittle material, and the surface forms part of the enclosure of live parts, for the surface that cannot be subjected to the impact test of 21.101, a three-drink impact test should be carried out, and the impact energy is 0.70 J ± 0.05 J. 21.101 If the appliance has a surface of glass, ceramic or similar isa material forming part of the enclosure of live parts, it shall withstand the stresses likely to occur in normal use. Compliance is checked by the following test: A container with a base made of copper or aluminium and a flat bottom diameter of 120 mm ± 10 mm and an edge chamfer radius of at least 10 mm is filled evenly with at least 1,3 kg ± 0,1 kg of banknotes or projectiles to a total mass of 1,8 kg. The container is dropped straight down from a height of 150 mm onto the surface t. This operation is carried out 10 times.
The appliance is then supplied with rated voltage and operated until steady conditions are established. The surface is then covered in the most unfavourable position with a wet pad of approximately 10 cm × 10 cm in size.
The pad is made of cotton cloth 40 cm × 40 cm with a dry mass density of 140 g/m2 to 175 g/m2. The cotton cloth is folded four times to form a mat and soaked in cold water with a concentration of about 1% NaCl. The appliance shall withstand the leakage current test of 16.2 and shall not show any visible cracks. 22 Construction
This clause of GB4706.1-1998 is applicable except for the following. 22.101 Portable appliances shall be constructed to prevent hazards caused by objects penetrating through the bottom. Compliance is checked by inspection and, if necessary, by measurement. Details: For appliances without feet, this requirement is considered to be met if the distance between live parts and the supporting surface measured through any opening is at least 6m. For appliances equipped with feet, this distance is increased to 10mm if intended for use on a table and to 20mm if intended for use on the floor. 23 Internal cloth
This clause of GB 4706.1-1998 is applicable. 24 Components
This chapter in GB 4706, 1-1998 is applicable except for the following contents. 24.1 This clause is added with the following contents:
GB 4706. 55-2002/1EC 60335-2-12:1992 Appliance couplers incorporating thermostats, thermal cut-outs or fuses in connectors shall comply with IEC 60320 except for the following conditions: During insertion or removal of the connector, the earthing contact is allowed to be touched if it is not held; the temperature required in Chapter 17 is the temperature of the pins of the appliance input socket measured during the heating test in Chapter 11 of this standard; the breaking capacity test in Chapter 18 is carried out with the appliance input socket! The temperature rise of the current-cutting components specified in Chapter 20 is not tested. Note: Connectors complying with IEC 60320 specifications are not allowed to be equipped with thermal controllers. 25 Power connection and external soft load
This chapter in GB 4706.1-1998 is applicable except for the following contents. 25.1 This clause adds the following contents:
Appliances with input sockets shall be provided with wire assemblies, unless the socket specifications comply with IEC6032025.7 This clause adds the following contents:
Appliances of any quality may use light polyvinyl chloride sheathed soft wires. 26 Terminals for external wires
GB 4706.1--1998 The contents of this chapter in GB4706.1-1998 are applicable. 27 Grounding measures
The contents of this chapter in GB4706.1-1998 are applicable. 28 Screws and connections
The contents of this chapter in GB 4706.1-1998 are applicable. 29 Electrical distances, electrical spacings and through insulation distances The contents of this chapter in GB 4706.1-1998 are applicable. 30 Heat resistance, flame resistance and resistance to electrical tracking
The contents of this chapter in GB4706.1-1998 are applicable except for the following contents. 30.2.2 is not applicable.
31 Anti-boiler
The contents of this chapter in GB4706.1-1998 are applicable. 32 Radiation, toxicity and similar hazards
The contents of this chapter in GB4706.1-1998 are applicable. GB4706.55—2002/IEC60335-2-12:1992 The appendix contents in GB 4706.1—1998 are applicable.
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