GB 4706.20-2000 Special requirements for safety of tumble dryers for household and similar electrical appliances
Some standard content:
1 , Amendment No. 2 (1998, 1999), is the first revision of GB4706.20-1988 "Special Requirements for the Safety of Simple Clothes Dryers for Household and Similar Electrical Appliances". This standard should be used in conjunction with GB4706.1-1998 "Safety Communication Requirements for Household and Similar Electrical Appliances".
The part of this standard that says "applicable" means that the corresponding provisions in GB4706.1-1998 are applicable to this standard; the part of this standard that says "replace" or "modify" should be based on this standard The "added" part of this standard means that in addition to complying with the corresponding provisions in GB4706.1-1998, it should also comply with the added provisions of this standard. This standard has been revised mainly in the following aspects: It is clearly stated in 6.2 that the appliance should be at least IPX4; 7.101 is added, solenoid valves and similar components directly connected to the water source, external hoses and similar components whose working voltage exceeds extra-low voltage should be Symbols:
- Chapter 11 Zhongyuan Standard 11.2 is cancelled, and the test method and limit value of the temperature rise of the front surface of easily accessible parts is added; - Chapter 15 Zhongyuan Standard 15.3, 15.4 is cancelled, and external hoses are added Solenoid valves and similar components are subject to the tests specified by IPX7 appliances. Appliances with working surfaces are added to conduct water spray tests and check that the electrical strength, creepage distance and electrical clearance comply with the specified values; - Chapter 18 Durability, not applicable; | |tt||—19.1 content replaced by 19.101 and 19.102. This standard will replace GB4706.20-1998 from the date of implementation. This standard is proposed and administered by the National Technical Committee for Standardization of Household Electrical Appliances. The main drafting unit of this standard: China Household Electrical Appliances Research Institute. The main drafters of this standard: Wang Hui, Li Xianli, Xu Li. This standard is entrusted to the National Technical Committee for Standardization of Household Electrical Appliances to be responsible for interpretation. GB4706.20-2000
IEC Preface
1) IEC (International Electrotechnical Commission) is a worldwide standardization organization composed of all national electrotechnical committees (IEC National Committees). Its purpose is to promote international cooperation on all standardization issues in the electrical and electronic fields. After this there are some other additional activities, such as the issuance of IEC international standards. Preparatory work for publication of International Standards is entrusted to technical committees. During this preparation process, any IEC National Committee may become involved in matters of interest. International, governmental and non-governmental organizations are also involved in this preparation. The IEC works closely with the International Organization for Standardization (ISO) in accordance with the conditions established by the agreement between the two organizations.
2) IEC’s formal resolutions or agreements on technical aspects are formulated by technical committees in which all national committees interested in these issues participate. Therefore, the issues involved are represented and elaborated as truthfully as possible. an international consensus. 3) IEC publishes standards, technical reports or guidelines in a recommended manner for international use and is accepted by national committees. 4) In order to promote international coordination, IEC hopes that national committees should adopt IEC standards in their national standards or regional standards when conditions permit. Any differences between national or regional standards corresponding to IEC standards and this standard shall be clearly stated in the latter. 5) IEC has not established procedures for approval marks. If a piece of equipment should be said to comply with a certain standard of IEC, IEC will not be responsible for this. This standard was developed by IEC Technical Committee 61 (Safety of household and similar electrical appliances). The 4th edition of IEC335-2-11 replaces the 1984 3rd edition and amendments 1 and 2 in 1989 and 1991. The contents of this standard are based on the following documents: DIS
61(CO)755
Voting Report
61(CO)769
Details of the voting report on this standard Information can be found in the voting report shown in the table above. This standard is used in conjunction with the latest version of IEC60335-1 and its amendments. This standard is developed based on IEC60335-1 3rd edition (1991).
This standard supplements and modifies the corresponding clauses of IEC60335-1, thus transforming into IEC standard: Safety requirements for electric tumble dryers.
The provisions of IEC60335-1 not mentioned in this standard can be used as long as they are reasonable. Wherever "addition", "modification" or "replacement" is marked in this standard, the relevant provisions in this standard shall be modified accordingly. Note
1 is represented by the following font:
Requirements: print,
Test procedures: italics,
Note: lowercase print:
The words in boldface in the provisions are the definitions given in Chapter 2. 2 The additional clauses and figures based on IEC60335-1 start from 101. The following differences exist in some countries:
- 2.2.9: Use different sizes of clothing (United States). 1 Chapter 3: Limitation of DC components connected to the neutral line of the appliance (Australia). —6.2: Tumble dryers are not required to be IPX4 appliances (USA). 1.7.1: Instructions related to cleaning the lint nozzle are marked on the dryer with a height of not less than 8mm. When the dryer door is open, this instruction is in a prominent place (Australia and New Zealand). GB4706.20—2000
—7.12: Use domestic clothing instead of the prescribed ones, and label warning requirements on the equipment regarding the use of chemicals during cleaning (United States). 11.2 Use other methods to conduct heat tests on tumble dryers (USA). 11.7: The test is continued until a steady state is established. When the steady state is reached, a different standard is used for measurement (USA). -19.4: Conduct different trials (USA). -19.9: Overload test required on automatically controlled tumble dryers (USA). —20.101: This requirement applies to machines with door openings exceeding 20cm (Norway). —20.102: When considering accessible rotating rollers, the maximum roller volume is 60 dm and the maximum door opening is 20 cm (USA).
20.103: Do not do this test (USA). - 22.103 Evaluation of the stability of stacked tumble dryers and washing machines using different methods (USA). A 27.1: Ground terminals and contacts permit electrical connection to the neutral conductor of a tumble dryer (USA). 1 Scope
National Standard of the People's Republic of China
Safety of household and similar electrical appliances
Special requirements for tumble dryers
Safety of household and similar electrical appliancesParticular requirements for tumbler dryers This chapter in GB4706.1-1998 is replaced by the following: GB4706.20-2000
idt IEC 60335-2-11:1993
replaces GB4706.20-1988||tt ||This standard applies to the safety of electric tumble dryers for household and similar purposes. For single-phase appliances, the rated voltage is not greater than 250V, and for other appliances it is not greater than 480V. Note 1: This standard applies to appliances that have both washing and drying functions. Appliances that are not for ordinary household use, as long as they may cause danger to the public. For example, appliances for public use in apartment buildings or launderettes are also included in this standard. within the range.
In practical terms, this standard addresses the common hazards presented by appliances that people encounter in and around their homes. This standard usually does not consider:
- the use of appliances by unsupervised children or infirm persons; - the situation of children playing with appliances.
Note
2 Attention should be drawn to the following facts:
Appliances used on vehicles, ships or aircraft must have additional requirements. Appliances used in tropical areas must have special Requirements, and in many countries additional requirements are laid down by national health authorities, national labor protection authorities, national water authorities and similar authorities. 3 This standard does not apply to:
Appliances specially used for industrial or commercial purposes Appliances used in special environments, such as environments where corrosive gases or explosive gases (dust, steam or gas) are present. 2 Definition
This chapter in GB4706.1-1998 is applicable except for the following content. 2.2.9 Replacement:
Normal operation: The tumble dryer is operated according to the maximum drying quality specified in the instruction manual. The textile material is a pre-washed double-folded cotton piece with a size of approximately 70cm x 70cm and a dry mass between 140g/m2 and 175g/m. Textile materials should be soaked with water with a temperature of 25℃±5℃ and a weight equal to that of the textile materials. In a washing machine, if the drying function can automatically follow the washing machine function, the drum does not need to be loaded separately. For tumble dryers with a combined wash-dry cycle, add the maximum mass of textile material and operate it as specified in the instruction manual. Note: Cotton cloth with a moisture content of no more than 10% is considered dry. When cotton is placed in still air with a temperature of 20°C ± 2°C, a relative humidity of 60% to 70%, and an air pressure of 860mbar to 1060mbar for 24 hours, its moisture content is approximately 7%. 2.101 Exhaust type tumble dryer: A type of textile material that tumbles in a rotating tumbler and dries the textile material by blowing hot air into it. Approved by the National Bureau of Quality and Technical Supervision on 2000-03-16 and 2001-03-01 Implement
appliances.
GB 4706.20—2000
2.102 Condensing tumble dryer: The air in the drying process is a tumble dryer that discharges water through cooling and dehumidification. 3 General requirements
This chapter in GB4706.1-1998 applies. 4 General conditions for testing
This chapter in GB4706.1-1998 applies. 5 Empty Chapter
6 Classification
This chapter in GB4706.1-1998 is applicable except for the following content. 6.2 Added:
Appliances should be at least IPX4.
7 Marks and Instructions
This chapter in GB4706.1-1998 is applicable except for the following content. Added:
7.10
If "off position" is expressed by only one word, this word should be expressed as "off". 7.12 Added:
The instruction manual should state:
The maximum mass of dry textile material for which the appliance is designed, expressed in kg. - The tumble dryer cannot be used if chemicals are used to clean the clothes. 7.12.1 Added:
Instructions should state:
If applicable, clean the lint trap frequently, - lint is not allowed to accumulate around the tumble dryer (intended to be ventilated to the outside of the building Not applicable to appliances); Condensing type tumble dryers intended to be connected to a water source: Maximum allowable water inlet pressure, expressed in Pa or bar;: If required for correct operation, the minimum allowable water inlet pressure, expressed in Pa or bar, should be stated bar means; an appliance with a ventilation opening at the bottom. The carpet must not block the opening. If the instruction manual states that the tumble dryer can be mounted on the top of a washing machine, the instructions should specify the appropriate washing machine. The instructions should give the assembly of the tumble dryer and washing machine. 7.101 For solenoid valve housings and similar components that are directly connected to the water source and incorporated in external hoses, if the operating voltage exceeds the extra-low voltage, they should be marked according to the N25036 symbol in IEC417. Compliance is checked by inspection.
8 Protection against contact with live parts
This chapter in GB4706.1-1998 is applicable. 9 Start-up of electric appliances
This chapter in GB4706.1-1998 is not applicable. 10 Input power and current
This chapter in GB4706.1-1998 is applicable. 11 Fever
GB4706.20-2000
This chapter in GB4706.1-1998 is applicable except for the following content. 11.2 Added:
Clean the lint collector and block 50% of the filter area. 11.3 Addition:
Use the test probe shown in Figure 101 to measure the temperature rise on the front surface of accessible parts. Use the test probe to apply a force of 4N ± 1N on the surface to be measured, so that the test probe and the surface to be measured are in good contact with each other as much as possible. Note: Any measuring instrument that gives the same results can be used. 11.7 Instead of:
Appliances equipped with timers, humidity sensor controllers or other time-limited controllers work on a cycle basis. Each cycle includes the maximum duration that the controller can provide and a 4-minute downtime when the appliance is reloaded. If the temperature rise of any component, plus 8 K plus the temperature rise measured in the previous cycle, does not exceed this limit at this time, the test may be terminated. Appliances equipped with program controllers with washing and drying functions operate in the drying program that causes the highest temperature rise. Other appliances operate continuously until a steady state is established. 11.8 Addition:
The temperature rise of the accessible front surface shall not exceed the following values: metal and painted metal parts
glass and ceramic metal parts
glass and ceramic parts...|| tt||Plastic parts with a thickness exceeding 0.3mm
The temperature rise limit of 80K is also applicable to metal-coated plastic materials with a thickness less than 0.1mm. Note: When the thickness of the plastic outer surface coating does not exceed 0.3mm, the temperature rise limit applies to the supporting material piece. When measuring temperature rise, all doors or covers are in the closed position. 12 Blank Chapter
13 Leakage current and electrical strength at operating temperature. Except for the following content, this chapter in GB4706.1-1998 is applicable. 13.2 Modification:
Replace the allowable leakage current value of fixed Class 1 appliances with the following: 60K
65K
65K
80
The leakage current of fixed Class I appliances should not exceed 3.5mA or the rated input power of 1mA per kilowatt, whichever is greater, but the maximum allowable value is 5mA.
14 Empty Chapter
15 Moisture Resistance
This chapter in GB4706.1-1998 is applicable except for the following content. 15.1 Addition:
Solenoid valves and similar components connected to the main water supply and incorporated in external hoses are subject to the tests specified for IPX7 appliances. 15.2 Modification:
Replace the test conditions with the following:
GB4706.20—2000
The roller is filled with wet textile materials specified for normal operation, and the mass of water is approximately 1.5 times the mass of dry textile material. For appliances with a working surface, pour a total of 0.5L of sodium chloride (NaCI) solution containing approximately 1% sodium chloride (NaCI) solution and 0.6% acidic rinse agent solution specified in Appendix AA of GB4706.25 from the top of the appliance where the controller is placed. . Then the control knob operates within its working range, and the operation is repeated after 5 minutes.
The appliance shall then be subjected to the electrical strength test in 16.3 and visual inspection shall show that there are no traces of water on the insulation that would cause the creepage distances and clearances to fall below the values ??specified in 29.1.
16 Leakage current and electrical strength
This chapter in GB4706.1-1998 is applicable except for the following content. 16.2 Modification:
Replace the allowable leakage current value of fixed type appliances with the following: For fixed type I appliances, the leakage current should not exceed 1mA or 1mA per kilowatt of rated input power, whichever is greater. , but the maximum allowed value is 5mA.
17 Overload protection of transformers and related circuits This chapter in GB4706.1-1998 is applicable. 18 Durability
This chapter in GB4706.1-1998 is not applicable. 19 Abnormal operation
This chapter in GB4706.1-1998 is applicable except for the following content. 19.1 If applicable, replace 19.101 with 19.101 and 19.102. 19.4 Replace:
The appliance is operated at 1.15 times the rated power input and on dry textile materials under the conditions specified in Chapter 11. Chapter 11 The controller for test operation and the self-resetting thermal circuit breaker that protects the heating element are short-circuited or disabled simultaneously. At the end of the maximum time allowed by the timer, the test ends.
19.9 is not applicable.
Added in 19.13:
Textile materials shall be non-flammable and shall exhibit no scorching or ignition. Note: Textile materials that are light brown or slightly smoke can be ignored. 19.101 Repeat the test of 19.4, but the thermal controller is not short-circuited and remove the roller belt. The test duration is 90 minutes or the maximum time allowed by the timer.
Due to a fault condition that may prevent air circulation, install the roller belt and stop air circulation and repeat the test. Note: If necessary, reduce the load to ensure proper tumbling of the textile material. If the above two situations are likely to occur from time to time, the test shall be combined. 19.102 For condensing tumble dryers, repeat 19.4 test, but block 75% of the condenser air inlet area. Then conduct a test to ensure that all air outlets are blocked.
20 Stability and mechanical hazards
This chapter in GB4706.1-1998 is applicable except for the following content. 20.1 Instead:
No test with the inclination angle increased to 15°. GB4706.20—2000
20.101 Appliances should have a device to prevent the door from opening during operation or an interlocking device to disconnect the power supply when the door is opened more than 75mm. When the door is opened more than 75mm, it should be impossible for the motor to start. If the door opening size of the appliance exceeds 30cm and the roller volume exceeds 100dm, the motor shall not be started until an independent manual operation device is operated to control the movement of the roller. The interlocking device should be constructed in such a way that it is impossible for the appliance to operate unexpectedly when the door is opened. Compliance is determined by inspection, measurement and manual testing (appliance at rated voltage and normal operation). If the door-opening preventer is equipped with a coil or similar element to lock the door in the closed position, this element is to be energized and de-energized 6000 times, 6 times per minute or a lower rate depending on the construction of the appliance. Interlocking devices and components shall be capable of further use. Note
1 If the interlocking device is required for mechanical operation, the door should be opened or closed during the test. 2 If the interlocking device can be released using the test finger shown in Figure 1, the appliance is considered to be capable of causing unintended operation. 20.102 If the size of the door opening of the appliance exceeds 30cm and the volume of the roller exceeds 100dm\, the door can be opened from the inside with a force not exceeding 70N.
Compliance is checked by inspection, measurement and force perpendicular to the plane of the door at the point furthest from the hinge. Note: This force can be applied to the outside of the machine door.
20.103 Appliances equipped with horizontally hinged doors should have sufficient stability when the door is opened and subjected to load. Compliance is determined through the following test: Place the unloaded appliance on a horizontal surface, and add a 23kg weight to the center of the open door. Appliances should not be tilted and damage to doors and hinges should not affect compliance with this standard. NOTE
1 Built-in appliances and top-loading appliances are not subject to this test. 2 Even if the liquid dryer can be stacked on top of the washing machine, it should be placed on a horizontal surface for testing. 21 Mechanical strength
This chapter in GB4706.1-1998 is applicable. 22 Structure
This chapter in GB4706.1-1998 is applicable except for the following content. 22.101 Heating elements should be secured or protected so as not to come into contact with textile materials. Compliance is determined by inspection.
22.102 Condensing tumble dryers intended for connection to a mains water supply shall withstand water pressure during normal use. Appliances connected to the main water source should withstand a static pressure equal to twice the maximum allowable water inlet pressure or 1.2MPa (12bar), whichever is greater, maintained for 5 minutes, and checked for compliance. There should be no leaks in any part including the water inlet pipe. 22.103 If the manufacturer specifies that the tumble dryer can be mounted on top of a washing machine, it shall be impossible for it to tip over. Accessories for installation should be provided by the manufacturer.
Compliance is checked by inspection and by the following test: A washing machine and tumble dryer are assembled together in accordance with the instructions. Place the entire unit on a flat surface in the most unfavorable position, including an inclination of 5° from the horizontal. Each appliance in turn is supplied with rated voltage and operates under normal conditions. The appliance should not tilt and the tumble dryer should not fall off the washing machine. 8 Internal wiring
23
GB4706.20—2000
This chapter in GB4706.1—1998 is applicable except for the following contents. 23.101 The internal wiring used to connect solenoid valves and the external soft cord of the appliance. The internal wiring used to connect similar components in the pipe should be at least equivalent to the lightweight polyvinyl chloride sheathed flexible cord (wire 52 of IEC60227).
Conformity is determined by inspection.
24 components
This chapter in GB4706.1-1998 is applicable except for the following content. 24.1.2 Add:
The number of working cycles of the program controller is 3000 times. 24.101 If a protective device operates during test 19.4, it shall be of the non-self-resetting type. Compliance is determined by inspection.
5 Power supply connection and external flexible cord
25
This chapter in GB4706.1-1998 is applicable. 26
Terminal blocks for external conductors
This chapter in GB4706.1-1998 is applicable. 27
Grounding Measures
This chapter in GB4706.1-1998 is applicable. 8 Screws and connections Www.bzxZ.net
28
This chapter in GB4706.1-1998 is applicable. 9 Creepage distances, electrical clearances and penetration insulation distances 29
This chapter in GB4706.1-1998 are all applicable. 30 Heat resistance, flame resistance and tracking resistance
This chapter in GB4706.1-1998 is applicable except for the following content. 30.2.2 does not apply. || tt | Switchgear carrying contacts, intended only for non-normal operation and other parts of insulating material, are also considered to withstand extremely severe operating conditions, unless they are enclosed or in a location where detergent contamination is unlikely to occur. In this case, consider being subjected to harsh working conditions. 31 Anti-rust
This chapter in GB4706.1-1998 is applicable. 32 Radiation, toxicity and similar hazards
This chapter in GB4706.1-1998 is applicable.103 If the manufacturer specifies that the tumble dryer can be placed on top of a washing machine, it should be impossible for it to tip over. Accessories for installation should be provided by the manufacturer.
Compliance is checked by inspection and by the following test: A washing machine and tumble dryer are assembled together in accordance with the instructions. Place the entire unit on a flat surface in the most unfavorable position, including an inclination of 5° from the horizontal. Each appliance in turn is supplied with rated voltage and operates under normal conditions. The appliance should not tilt and the tumble dryer should not fall off the washing machine. 8 Internal wiring
23
GB4706.20—2000
This chapter in GB4706.1—1998 is applicable except for the following content. 23.101 The internal wiring used to connect solenoid valves and the external soft cord of the appliance. The internal wiring used to connect similar components in the pipe should be at least equivalent to the lightweight polyvinyl chloride sheathed flexible cord (wire 52 of IEC60227).
Conformity is determined by inspection.
24 components
This chapter in GB4706.1-1998 is applicable except for the following content. 24.1.2 Add:
The number of working cycles of the program controller is 3000 times. 24.101 If a protective device operates during test 19.4, it shall be of the non-self-resetting type. Compliance is determined by inspection.
5 Power supply connection and external flexible cord
25
This chapter in GB4706.1-1998 is applicable. 26
Terminal blocks for external conductors
This chapter in GB4706.1-1998 is applicable. 27
Grounding Measures
This chapter in GB4706.1-1998 is applicable. 8 Screws and connections
28
This chapter in GB4706.1-1998 is applicable. 9 Creepage distances, electrical clearances and penetration insulation distances 29
This chapter in GB4706.1-1998 are all applicable. 30 Heat resistance, flame resistance and tracking resistance
This chapter in GB4706.1-1998 is applicable except for the following content. 30.2.2 does not apply. || tt | Switchgear carrying contacts, intended only for non-normal operation and other parts of insulating material, are also considered to withstand extremely severe operating conditions, unless they are enclosed or in a location where detergent contamination is unlikely to occur. In this case, consider being subjected to severe vinegar working conditions. 31 Anti-rust
This chapter in GB4706.1-1998 is applicable. 32 Radiation, toxicity and similar hazards
This chapter in GB4706.1-1998 is applicable.103 If the manufacturer specifies that the tumble dryer can be placed on top of a washing machine, it should be impossible for it to tip over. Accessories for installation should be provided by the manufacturer.
Compliance is checked by inspection and by the following test: A washing machine and tumble dryer are assembled together in accordance with the instructions. Place the entire unit on a flat surface in the most unfavorable position, including an inclination of 5° from the horizontal. Each appliance in turn is supplied with rated voltage and operates under normal conditions. The appliance should not tilt and the tumble dryer should not fall off the washing machine. 8 Internal wiring
23
GB4706.20—2000
This chapter in GB4706.1—1998 is applicable except for the following contents. 23.101 The internal wiring used to connect solenoid valves and the external soft cord of the appliance. The internal wiring used to connect similar components in the pipe should be at least equivalent to the lightweight polyvinyl chloride sheathed flexible cord (wire 52 of IEC60227).
Conformity is determined by inspection.
24 components
This chapter in GB4706.1-1998 is applicable except for the following content. 24.1.2 Add:
The number of working cycles of the program controller is 3000 times. 24.101 If a protective device operates during test 19.4, it shall be of the non-self-resetting type. Compliance is determined by inspection.
5 Power supply connection and external flexible cord
25
This chapter in GB4706.1-1998 is applicable. 26
Terminal blocks for external conductors
This chapter in GB4706.1-1998 is applicable. 27
Grounding Measures
This chapter in GB4706.1-1998 is applicable. 8 Screws and connections
28
This chapter in GB4706.1-1998 is applicable. 9 Creepage distances, electrical clearances and penetration insulation distances 29
This chapter in GB4706.1-1998 are all applicable. 30 Heat resistance, flame resistance and tracking resistance
This chapter in GB4706.1-1998 is applicable except for the following content. 30.2.2 does not apply. || tt | Switchgear carrying contacts, intended only for non-normal operation and other parts of insulating material, are also considered to withstand extremely severe operating conditions, unless they are enclosed or in a location where detergent contamination is unlikely to occur. In this case, consider being subjected to severe vinegar working conditions. 31 Anti-rust
This chapter in GB4706.1-1998 is applicable. 32 Radiation, toxicity and similar hazards
This chapter in GB4706.1-1998 is applicable.
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