GB 17652-1998 Safety of electric blankets, electric heating pads and similar household flexible heating appliances
Some standard content:
GB17652-1998
Foreword
This standard adopts the IEC publication IEC967 (1st edition in 1988) and its first supplement (1991 edition). Currently, the GB4706.8-1986 "Special Requirements for Safety Electric Blanket, Electric Heating Mat and Electric Heating Mattress for Household and Similar Electrical Appliances" implemented in our country is formulated with reference to IEC335-17 (1974 edition) and is consistent with GB4706.1-1992 " "General Safety Requirements for Household and Similar Electrical Appliances" (IEC335-1) is used together. Now IEC has officially promulgated and implemented the 1988 version of the new standard IEC967, making flexible heating appliances independent of IEC335. To this end, my country has now adopted the above-mentioned new IEC standard. Transformed into new national standards. Some of the cited standards listed in IEC967 have been converted into Chinese standards to varying degrees, and some have not been converted into Chinese standards. This standard uses corner notes to indicate the sources of the Chinese versions of these cited standards. IEC standards are still in the process of development and improvement, and all of its standards will be revised. All parties using this standard should explore the possibility of using the latest IEC standards to comply with my country's policy of actively adopting international standards and the principle of equal adoption of IEC standards. The appendices to this standard are appendices to the standard. This standard is proposed by China Light Industry Federation.
This standard is under the jurisdiction of the China Household Appliances Standards Technical Committee. This standard was drafted by China Household Electrical Appliances Research Institute and Guangzhou Household Electrical Appliances Research Institute. The main drafters of this standard: Ge Fengliang, Li Xingren, Xue Yusheng, Lu Weiqiang, Xie Yaohua, Xu Yanrong. GB17652-1998
IEC Foreword
1) IEC resolutions or agreements on technical issues are formulated by technical committees participating in all national committees with special interest in this issue, and reflect international standards as much as possible. A consensus of opinion on the issues involved. 2) Recommend these resolutions or agreements for international use and be recognized by national committees in this sense. 3) In order to promote international unification, IEC hopes that all national committees will adopt the contents of IEC standards as national standards to the extent permitted by their national circumstances. standard. If there are any differences between IEC and the corresponding national standards or regional standards, they should be clearly pointed out in the national standards as much as possible. Preface
This International Standard was drafted by IEC Technical Committee 61 (Safety of household and similar electrical appliances). This is the first edition of this standard and replaces the 1974 IEC 335-17. This standard is based on the following documents:
6-month rule
61(CO)480
Poll report
61(CO)529
All material regarding the vote taken when this standard was adopted can be found in the vote report above. This standard cites the following IEC and ISO publications: IEC61-1: Lamp holders and lampholders and specifications for testing their interchangeability Part 1: Lamp holders IEC65 (1985): Household and similar general-purpose electronic equipment powered by mains power and safety requirements for related equipment EC83 (1975): Plugs and sockets for household and similar general purposes IEC85 (1984): Evaluation and classification of heat resistance of electrical insulation IEC112 (1979): Tracking of solid insulating materials under humid conditions compared to leakage Determination method of index and tracking resistance index IEC127-3 (1984): Tubular fuse-links for miniature fuses IEC227: Polyvinyl chloride insulated cables with rated voltage not exceeding 450/750V IEC238 (1987): Edison thread lamp holder IEC320: Connectors for household and similar general purpose appliances IEC328 (1972): Appliance switches
IEC335-1 (1976): Safety of household and similar electrical appliances Part 1: General requirements IEC335-2-32 (1987): Safety of household and similar electrical appliances Part 2: Special requirements for massager appliances IEC384-14 (1981): Fixed capacitors for electronic equipment Part 14: Selection of test methods and general requirements for fixed capacitors to suppress radio interference ||tt ||IEC742(1983): Technical requirements for isolating transformers and safety isolating transformers IEC817(1984): Spring impact testers and their calibration IEC601-1 Medical electrical equipment Part 1: General requirements IEC730: Household and similar - General purpose electrical appliances automatic Controller IEC730-1(1986): Automatic controllers for household and similar general-purpose appliances Part 1: General requirements IEC730-2-1(1989): Automatic controllers for household and similar general-purpose appliances Part 2: Electricity for household appliances Special requirements for controllers
IEC685-2-1(1980): Connections (terminating and/or tapping) for fixed electrical installations for household and similar general purposes Part 2: Special requirements for unthreaded connections| | tt | |Safety of electrically heated blankets, pads and similar flexible heating appliances for household useGB17652—1998
idtIEC967-1988
replaces GB4706.81986
1.1 This standard applies to flexible electric heating appliances designed to heat beds or human bodies. Such as: electric blankets, electric heating pads and electric heating mattress pads for household use, and the control devices provided with them. Note: This standard does not apply to:
a) Rigid bed heaters: such as beds made of metal or ceramic materials; b) Special appliances used by personnel under medical supervision; c) Apparatus used for domestic animals; || tt||d) Water bed heater.
This standard also applies to appliances with massage functions that comply with IEC335-2-321. Additional requirements for appliances with conductive sheet-type heating elements are under consideration. 1.2 This standard is related to safety and takes into account the impact on safety of components required to suppress interference with radio and television. 2 Definitions
2.1 Unless otherwise specified, the terms "voltage" and "current" used in this standard ” all refer to the effective value 2. The terms used in this standard are defined as follows: 2.2
2.2.1 Flexible part flexiblepart
The heating element, thermostat and all current-carrying parts are included in it, All layers of materials that make up the permanent outer covering of an appliance. Note: This flexible part can also be a removable outer cover. 2.2.2 Electric blanket blanket
generally refers to an electric heating appliance used for bed heating, which is basically flat and soft and forms part of the bedding. 2.2.3 Under-blanket electric blanket is designed to be placed under the person lying on the bed. 2.2.4 Ruck-resistant electric blanket ruck-resistantblanket is a bottom electric blanket with a certain rigid structure so that the flexible part is not easy to wrinkle. 2.2.5 Over-blanket
over-blanket
An electric blanket designed to cover a person lying on a bed. 1) IEC335-2-32 publication "Safety of Household and Similar Electrical Appliances Part 2: Special Requirements for Massager Electrical Appliances", please refer to GB4706.101993.
National Bureau of Quality and Technical Supervision approved on 1998-11-17 for implementation on 1999-09-01
2.2.6 Electric heating pad (pad))
GB 17652—1998
An appliance composed of a flexible part designed for local heating of the human body and with a heating area of ??no more than 0.2m measured on one side only. | |tt | When working in the exothermic state, its input power will automatically and significantly decrease as the temperature of the flexible part increases.
2.2.9 Control unit
controlunit
A device external to the flexible part of the appliance by which the average input power of the appliance can be changed or adjusted. Note: A soft-wire switch is not considered a control device if it does not have components with other control functions. 2.2.10. A cord control unit is a control unit held in the hand during use. Note: The cord control device can be installed on the power cord or at the end of the interconnecting cord. 2.2.11 heating element heating wire, together with the core around the wire and any other wires and insulation connected together. 2.2.12 Heating area heatedarea
The area of ??the flexible part within the perimeter of the heating element. It also includes the edge strip outside the perimeter line. The width of this edge strip is equal to 0.5 times the average distance between two adjacent parallel traces of the heating element. Note
1 If the distance between the loop part and the adjacent heating wire does not exceed the average distance between two adjacent parallel traces of the heating element, then the heating area includes the loop part of the heating element.
If an electric blanket or heating pad has two separate heating surfaces, and the distance between the two heating elements does not exceed two adjacent parallel elements of the heating element at any place
1.5 times the average distance between traces, then the area between the two areas is also part of the heating surface. 2.2.13 Rated voltage ratedvoltage
The voltage specified by the manufacturer for the appliance.
2.2.14 Rated voltage range The voltage range specified by the manufacturer for the appliance. Expressed as upper and lower limits. 2.2.15
5 working voltage workingvoltage
The maximum voltage that the component being measured can withstand when the appliance is operating at rated voltage and normal use. Note: When extrapolating the operating voltage, the effect of transient voltages on the power grid is negligible. 6 Rated input power ratedinput
2.2.16
The input power specified by the manufacturer for the appliance under sufficient heat dissipation conditions. 2.2.17 Rated current rated current
The current specified by the manufacturer for the appliance.
Note: If the current is not specified for the appliance, it can be determined by using the rated input power and rated voltage. 2.2.18 Rated frequency is the frequency specified by the manufacturer for the appliance.
2.2.19 Detachable part detachablepart A component that can be detached without the use of tools. 2.2.20 Non-detachable part: A part that can only be removed with the help of tools. power supply cord
2.2.21 Power supply cord
In order to achieve the purpose of power supply, it is fixed to the appliance in one of the following methods, or is a flexible cord assembled with the appliance: typeX attachment
a) connection method. b) M-type connection typeMattachment
A special flexible cable or cord (such as a flexible cable or cord with molded protective terminals or crimp terminals) that can be easily used without the help of special tools, or It is a connection method that easily replaces the original cord by replacing the parts equipped with the cord on the appliance. c) Y-type connection
typeYattachment
A connection method in which the connection can be accessed or made by using special tools. The Y-type connection can use ordinary soft wires or special soft wires. typeZattachment
d) Z-type connection
A connection method that cannot be replaced without breaking or damaging the appliance, 2.2.22 internal flexible cord interconnectioncorc A connection between the flexible part of the appliance and the control A cord connecting a device or cord switch, or an external interconnecting cord between two flexible parts or between two control devices.
detachableflexiblecord
2.2.23 Detachable flexible cord
A power cord or interconnection cord connected through a suitable appliance coupler. 2.2.24 Basic insulation basicinsulation is an insulation applied to an appliance to provide basic protection against electric shock. Note: Basic insulation does not need to include insulation for dedicated functional purposes. 2.2.25 Supplementary insulation supplementary insulation is an independent insulation added to the basic insulation to provide protection against electric shock when the basic insulation is damaged. 2.2.26 Double insulation doubleinsulation insulation consisting of both basic insulation and supplementary insulation. 2.2.27 Reinforced insulation reinforcement A single insulation system applied to live parts. The level of protection against electric shock it provides is equivalent to double insulation under the conditions specified in this standard.
Note; "Insulation system does not mean that the insulation must be a uniform piece. It can be composed of several layers, but cannot be tested individually like supplementary insulation or basic insulation.
2.2. Class 280 appliance class0appliance An appliance that provides protection against electric shock by basic insulation. This means that it has no means of connecting accessible conductive parts (if any) to protective conductors in the installed fixed wiring. If the basic insulation is damaged, it depends on environmental protection. Note: Class 0 appliances may have double insulation or reinforced insulation components. 2.2.29 Class II appliances cannot provide protection against electric shock by basic insulation alone, and shall have double insulation or reinforced insulation. Appliances with additional safety protection measures such as insulation, but which do not have ground protection or rely on installation conditions to provide reliable protection measures. Such appliances may be equipped with one of the following structures: a) Have a durable and solid ground. Appliances with integrated insulating material shells. Except for nameplates, screws, rivets and other metal parts, all metal parts contained in the shell are isolated from live parts by insulation at least equivalent to reinforced insulation. This type of appliance is called Insulated enclosed class 1 appliances.
b) Appliances with solidly integrated metal casings, all of which are double insulated except for some parts that are obviously not feasible because of double insulation. The appliance is called a metal-embedded enclosed Class I appliance. c) It is a combination of structures a) and b)
wWNote
GB17652-1998
1 Class I appliance. The outer shell may be used as part or all of supplementary insulation or reinforced insulation. Type 2b) and c) structures are not applicable to flexible parts. Class 3 appliances may have components operating at safety extra-low voltage. Class I appliances classIappliance|| tt | Note: Appliances that operate at safety extra-low voltage but have internal circuits that operate at voltages other than safety extra-low voltage are not included in this classification and should comply with additional requirements
2.2.31 Extra-low voltage extra-low voltage The voltage provided by the power supply of the appliance. When the appliance is operated at its rated voltage, the voltage between the conductors and between the conductors and the ground does not exceed 42V; this extra-low voltage circuit uses only basic insulation Separate from other circuits. 2.2.32 Safety extra-low voltage The nominal voltage between the conductor and the conductor and the ground does not exceed 42V, and its no-load voltage does not exceed 50V. Note: When obtaining safety characteristics from the grid power supply. For low voltages, a safety isolating transformer or a converter with separate windings is required. The specified voltage limits are based on the assumption that the safety isolating transformer is operating at its rated supply voltage. 2.2.33 Safety isolating transformer safety isolating transformer is a transformer that electrically separates the input winding and the output winding of the transformer through a method that is at least equivalent to double insulation or reinforced insulation. It is designed to supply power to appliances operating at safety extra-low voltage. 2.2.34 conditions of adequateheatdischarge The flexible part works as follows:
The flexible part is supported by a 20mm thick bakelite board, not less than 300mm from the ground. The heating pad is placed on top of the plywood and covered with a layer of insulating material. The electric heater works as a cover-type electric blanket, but there is no upper insulation layer. Other utensils should be placed between two layers of insulation on the Bakelite board. The plywood should be sized so that the entire area of ??the insulation is fully supported. Unless otherwise specified, the size of the general insulation material layer should have its edge extending at least 100mm beyond the perimeter line of the heating surface. Note: Specifications for thermal insulation materials are given in Appendix C. 2.2.35 Thermostat thermostat
A temperature-sensitive device, its operating temperature can be fixed or adjustable. During normal operation, it maintains the temperature of the appliance, or the temperature of a certain part of the appliance, within a certain range by automatically turning on or off the circuit. 2.2.36 Temperature limiter temperature limiter is a heat-sensitive device whose operating temperature is fixed or adjustable. During normal operation, when the temperature of the appliance or the temperature of the appliance components reaches a predetermined value, the circuit is turned on or off. Note: The temperature limiter will not respond in reverse during the normal working cycle of the appliance. It may or may not require manual reset. 2.2.37 Thermal cut-out is a device that can limit the temperature of the appliance or the temperature of a certain part of the appliance by automatically disconnecting the circuit or reducing the current during abnormal operation. Its structure prevents the user from changing it. Setting value. 2.2.38 All-poledis connection can cut off two power wires with one switch action. 2.2.39 Accessible parts or accessible surfaces accessiblepart or accessiblesurface A component or surface that can be touched by the standard test finger shown in Figure 1. 2.2.40 Creepage distance
creepage distance
The shortest path distance between two conductive parts or between the boundary surface of the conductive part and the appliance measured along the surface of the insulating material. GB17652-1998
Note: The boundary of the appliance refers to the surface of the outer cover, which can be achieved by pressing a metal foil against the accessible surface of the insulating material. 2.2.41 Electrical clearance
clearance
The shortest path distance measured through air between two conductive parts, or between a conductive part and the boundary surface of the appliance. 2.2.42 tool tool
screwdriver, coin or any other object used to operate screws or similar fastening devices. 2.2.43 Shell body
includes all accessible metal parts, handle shafts, knobs, clamps, etc., as well as metal foil in contact with the accessible surface of insulating materials. It does not include inaccessible metal parts. . Note: The term "shell" cannot be used for flexible parts. 2.2.44 Unsupported flexible plastic sheeting
unsupported flexible plastic sheeting is a thin layer of material whose composition characteristics are polyvinyl chloride resin or polyvinyl acetate copolymer resin. Note: The word "soft" means that the material is completely malleable, while "unsupported" means that the material is completely free of reinforcing fibers, threads and fabrics. 2.2.45 Bonded enclosure is an enclosure of flexible components that combines opposite sides together by bonding or welding. 2.2.46 Electric quilt duvet
is a quilt-like top-cover electric blanket that is prepared to cover the person lying on the bed without adding other bedding, and its internal heating element can provide supplementary heat . 2.2.47PTC heating element PTCheatingelement is mainly composed of a thermistor with a positive temperature coefficient and is used for heating. When the temperature rises within a special range, its resistance can increase rapidly and nonlinearly.
3 General requirements
The design and manufacture of electrical appliances should ensure that they work safely and reliably during normal use, and will not cause harm to people and the surrounding environment even if misoperation may occur during abnormal use. harm. Compliance is generally checked by carrying out all relevant tests. 4 General instructions in testing
4.1 Tests conducted in accordance with this standard are type tests. 4.2 The test is carried out on two samples (A and B). These two samples shall be subjected to all relevant tests. The order of conducting the tests is as follows:
Sample A withstands 5,7,8,22.28,10,11.7,21.2,21.3,21.4,21.5,21.6,21.7,22.17,13,15,16,17,2025.10, 25.11, 25.12, 19, 22.10, 21.8, 21.9, 22.23, 30 and 31, the test sample B of clauses 10, 11 (remaining part), 21.17, 21.18, 21.23, 22 (remaining part), 23, Tests for chapters 24, 25 (remaining part), 26, 27, 28 and 29.
Unless otherwise stated, electric heating is tested as a cover-type electric blanket. Note
1 For the test of Article 19.9, an additional sample may be required. 2 pairs of appliances with combined jackets require an additional sample to conduct the tests of 21.9, 21.19~21.22. 3 pairs of appliances without combined jackets require a heating element with a length of 15m to conduct the tests of 21.19~21.22. 4 For moisture-proof electric heating pads that need to withstand the tests of 21.10~21.16, 5 additional samples and a 1m piece of jacket material are required. 5 If the design of the appliance indicates that a special test is not applicable, this test need not be carried out. 4.3 Before starting the test, both samples A and B must be operated at rated voltage to verify whether they are working properly. For washable utensils, the flexible parts should be washed twice according to the manufacturer's instructions. 4.4 Unless otherwise specified, the appliance or any removable parts of the appliance shall be tested in the most unfavorable position in which they may be placed in normal use
GB17652—1998
4.5 If the appliance The flexible part is equipped with a removable cover. The test can be carried out with or without this cover, and the most unfavorable case of the two should be carried out. The electric quilt is tested with the removable cover removed. 4.6 Unless otherwise specified, general tests are conducted at an ambient temperature of (20±5)°C. For flexible parts with PTC heating elements, unless otherwise specified, the test should be conducted at the most unfavorable temperature in the range of 0 to 25C. However, when conducting the tests of Chapters 10, 11 and 19 of other self-controlled electric blankets and electric mattresses, the ambient temperature should be maintained at the most unfavorable temperature in the range of 0 to 15°C. 4.7 AC appliances should only be tested with AC power at the marked rated frequency (if any); DC appliances can only be tested with DC power; appliances that can be used with both DC and AC power supplies should be tested with the most unfavorable one. power supply for testing. Appliances designed for use in more than one rated voltage range shall be tested at the most unfavorable voltage. Unless otherwise specified, appliances designed for use in one or more rated voltage ranges shall be tested at the most unfavorable voltage in the corresponding range. Voltage test.
For self-controlled appliances marked with a rated voltage range, when the supply voltage is specified to be equal to this rated voltage multiplied by a factor, the supply voltage shall be:
a) If the factor is greater than 1, be the upper limit of the rated voltage range multiplied by this factor; b) if the factor is less than 1, be the lower limit of the rated voltage range multiplied by this factor. When testing appliances only for direct current, the polarity of the appliance must be taken into account. possible impact of the work. Note: Wherever the maximum or minimum rated input power is mentioned, it refers to the rated input power related to the upper or lower limit of the rated voltage range respectively. If an appliance is designed for use in a rated voltage range, the upper limit of this voltage range will generally be the most unfavorable voltage within this range. 4.8 When the supply voltage of an appliance is specified so that its input power is greater than the rated input power, this voltage is only Applied to resistive heating elements that do not have obvious positive temperature coefficient characteristics. For other heating elements, this voltage is determined as follows. First, apply the rated voltage until the electric heating element reaches its operating temperature. Then, the power supply voltage is rapidly increased to give the input voltage value required for the relevant test, and the test is performed as specified, maintaining this power supply voltage throughout the test process. value. Note: This temperature coefficient is generally considered to be significant if, at rated voltage, the input power of the appliance in the cold state deviates by more than 15% from the input power at operating temperature.
4.9 Unless otherwise specified, appliances equipped with a thermostat, a regulating device or a similar control, if the setting position can be selected by the user, these controls shall be adjusted to their most unfavorable position. NOTE: If the adjustment device of the controller is accessible without tools, this requirement applies regardless of whether the adjustment is made by hand or with a tool. This provision does not apply if the adjustment device is not accessible without tools and is not intended to be adjusted by the user. Adequate sealing is required to prevent the set position from being changed by the user.
4.10 Class II appliances shall be tested together with their power transformers if a transformer is supplied with the appliance. Control devices supplied with the appliance shall be tested together with the appliance. 4.11 If a Class 0 or Class 1 appliance contains components operating at safety extra-low voltage, the compliance of such components shall be checked in accordance with the corresponding requirements for Class II appliances.
4.12 For appliances equipped with electronic circuits, Appendix B applies. 5 Rating
The maximum rated voltage is:
a) For Class 0 and Class 1 appliances, it is 250V;
b) For Class II appliances, it is 24 V.
Whether it is qualified or not is determined by checking the mark. 6 Classification
Appliances are classified as:
6.1 Classification according to protection against electric shock:
a) Class 0 appliances;
b) Class I appliances;
c) Class I appliances.
6.2 Classification according to moisture-proof gradeWww.bzxZ.net
a) Moisture-resistant appliances;
b) Moisture-proof appliances.
GB17652—1998
Note: The classification of an appliance depends on the classification of the flexible parts of the appliance. This classification number is not used to reflect the degree of safety of the appliance or control device, but only indicates the way in which safety is achieved through it. Control devices and Class III appliances are not classified according to moisture resistance level. In clauses 22.1 and 22.2, requirements for the classification of appliances are given. 7 Marking
7.11. Flexible parts and detachable control devices should be marked; a) Rated voltage or rated voltage range (V); b) Symbol of power supply type (if applicable); c) Rated input power of the appliance (W);
d) Symbol of Class 1 structure (only for Class I appliances); e) Manufacturer’s model number or reference type.
2. Flexible parts, removable covers and removable controls should be marked with the name, trademark or identification mark of the manufacturer or responsible seller.
3. Removable covers shall be marked with the model or reference type of appliance with which they are intended to be used. 4. Flexible parts of appliances with removable controls shall be marked with the reference to the controls used. 5. Flexible parts of appliances with removable transformers shall be marked with a reference to the transformer used. Qualification shall be determined through inspection.
7.21. The flexible parts and removable covers should be marked with the following instructions: a) Read the instructions carefully;
b) Do not fold for use (only for electric heating pads and electric blankets; for electric heating quilts and appliances with PTC heating elements, this mark does not apply); c) Do not use them in wrinkles (only for electric blankets on the bottom, this mark does not apply to appliances with PTC heating elements); d) Do not fold (only This mark is not required for electric blankets, electric quilts and appliances with PTC heating elements). However, if the outer edge of the wiring can be clearly seen, the mark can be marked as "The wiring area cannot be rolled and used"; the removable cover should have extra dimensions (only for electric heating quilts), and the length and width of the cover should be indicated; || tt | It can only be used as a top-cover electric blanket (only for top-cover electric blankets); i) It must not be used by people who cannot take care of themselves, young children or people who are insensitive to heat; j) Use it in the high-temperature setting position for too long Time can cause skin burns (only for electric heating pads, except for appliances equipped with a timer that turns off the power after more than 1 hour).
Note: On electric heating pads that are not equipped with temperature adjustment devices, there is no need to use the phrase "at the high temperature setting position\".
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