GB 4706.1-1998 Safety of household and similar electrical appliances Part 1: General requirements
Some standard content:
GB 4706. 1 -- 1998
This standard is the general safety requirements for household and similar electrical appliances. This standard is equivalent to the third edition of the International Electrotechnical Commission IEC335-1 (1991) "Safety of Household and Similar Electrical Appliances Part 1: General Requirements and its First Amendment (1994)". In this standard, the IEC standards used as normative standards and the corresponding national standards are listed in Appendix A. If there is a corresponding national standard, the cited national standard shall be used as the norm; if there is no corresponding national standard, the listed IEC standard shall be used as the norm. The main differences between this standard and the third edition of IC Publication 335-1 (1991) are as follows: 1) In 24.1, "comply with the safety requirements specified in the relevant 1FC standards" is replaced by "comply with the safety requirements specified in the relevant national standards or 1FC standards".
2) Where IEC335-1 (1991) involves citing IEC standards, if there is a national standard corresponding to the IEC standard, this standard will write the corresponding national standard.
3) 7.12.4, item 6, replace "unless the appliance is provided with a switch complying with 24.3" with "unless the appliance is provided with a switch complying with 24.3".
In GB 41706.1-1992, the second edition of IEC publication 335-1 (1976) and its amendments No. 1, 2, 3, 4.5.6 are adopted for the purpose of equivalent, so this standard and GB 4706.1-1992 are two different versions, and the editing is completely different. In order to make the third edition of 1FC: publication 335-1 correspond to its second edition in terms of chapter titles and appendix titles, the editing method of listing blank chapters and appendices was adopted when the publication was formulated.
In terms of technical content, this standard has the following main differences from GB 4706.1-1992: This standard has an important quotation after the IEC foreword, while GB 4706.1-1992 does not have such a quotation. The maximum rated voltage for non-single-phase appliances specified in Chapter 1 of this standard is 480V, instead of 440V as specified in Chapter 5 of GB 4706.1-1992. Chapter 5 of this standard eliminates the term "M connection". The M connection in Chapter 2 of GB 4706.1-1992 is included in the definition of "X connection". Chapter 2 of this standard adds the definition of Class I structure and Class II structure. There are no such definitions in this chapter. The definition of portable appliances in Chapter 2, 2.6.1 of this standard adds the content of "non-fixed installation appliances with a pressure of less than 18 kg", while GB4706.1-1992 does not have such content. The definition of detachable parts in Chapter 2, 2.7.2 of this standard adds the content of "parts that the manufacturer informs the user to remove (even if it needs to be removed with tools), or parts that cannot complete the test in Article 22.11". However, GB41706.1-1992 does not have such content. - Chapter 2 of this standard adds 2.10.4 definition of PTC electric heating element, while GI47061-1992 does not have such content. - Chapter 6 of this standard classifies and tests the waterproof level of appliances according to 1IX-~IPX7 of GR4208 (1-X: 529), which is not classified into four categories of general, drip-proof, splash-proof and watertight according to GB4706.1-1992. All technical requirements in Chapter 9 of GB 4706.1-1992 are cancelled in this standard. When necessary, the tests and requirements are specified in the special safety requirements of the product.
The deviation value of input power in Chapter 10 of this standard is significantly different from the deviation value specified in GB 4706.1-1992. Chapter 12 of GB 4706.1-1992 is completely cancelled in this standard and becomes a blank chapter. Chapter 13 of this standard conducts withstand voltage test on electric heating and electric appliances at working temperature. However, GB 4706.1-1992 conducts voltage test on the insulation of other parts except motor insulation. Chapter 13 of this standard provides for the short-circuit current and tripping current of withstand test (electric strength test) device through annotations, while GB 4706.1-1992 does not have these annotations. GB 4706.1-1998
—.Chapter 14 of GB4706.11992 is completely cancelled in this standard, and the chapter becomes a blank chapter. —A note is added to Article 15.4 of Chapter 15 of GB4706.1-1992: "For appliances used in hot and humid areas, the relative humidity of the wet treatment is 93.%, and the air temperature of all places where samples can be placed in the humid room should be maintained at (40±2)°C". This standard cancels this note. Chapter 16 of this standard cancels the insulation resistance test, and the leakage current test is carried out for both electric and electric heating appliances, while the cell terminal current is measured for electric heating appliances and the insulation resistance is measured for electric appliances according to GB4706.1-1992. All requirements in Chapter 18 of GB476.1-1992 on durability are cancelled in this standard. In Chapter 19 of this standard, 19.6 is added. For appliances with PTC heating elements, the abnormal operation test of the PTC heating elements is not included in GB 1706.1-1992. In Chapter 21 of this standard, the impact energy of the impact tester is specified as (0.5 ± 0.04) J, while GB4706.1-1992 specifies it as (0.5 = 0.05) N + m.
In Chapter 22 of this standard, 22.1 is added. If the appliance is marked with the first characteristic numeral of the IP code, it shall meet the relevant requirements of GB 4208 (IEC529): "While GB4706.11992 does not have this content. In Chapter 22 of this standard, 22.11 is added. The reliability test of the fixing method of non-detachable parts is carried out using the test nail shown in Figure 10. While GR 4706.1:1992 does not have this test method and test tools. - Article 22.12 of Chapter 22 of GB4706.1-1992 states that for handle knobs, clip levers and similar parts that may be subjected to axial forces, such as actuators of non-electrical components, an axial force of 5N is applied to check their reliability, while Article 22.11 of this standard does not distinguish between electrical components and non-electrical components, and applies a force of 30N as long as they may be subjected to axial forces. Article 22 of this standard adds Article 22.14 "The appliance shall not have rough or sharp edges that may cause danger to the user during normal use or user maintenance", while GB4706.1-1992 does not have this content. Article 22.23 of Chapter 22 of this standard adds "Oil containing polyfluorinated crosslinking (PCB) shall not be used in appliances", while GB 4706.1-1992 does not have this content.
Chapter 25, 25.13.2 of this standard stipulates that the insulation between the power cord and the external light shall have at least one layer of separate insulation in addition to the insulation layer of the wire for Class 0 appliances, and at least two layers of separate insulation for other appliances. However, Article 25.8 of GB4706.1-1992 stipulates that Class 0, 01 and Class 1 appliances shall have at least: layers of separate insulation. Chapter 30 of this standard stipulates that for the current-carrying parts of attended appliances, if the current exceeds 0.5A, the insulating material support shall be subjected to a 650°C glow-wire test instead of the 750°C glow-wire test specified in GB4706.1-1992. For the current-carrying parts of unattended appliances, if the current exceeds 0.5A, the insulating material support shall be subjected to a 750°C glow-wire test instead of the 850°C glow-wire test specified in GB4706.1-1992. If a fire melts during the glow-wire test, the surrounding parts shall be subjected to the needle-flame test.
Article 30.2.3 of this standard stipulates that parts made of materials classified as FV-0 or FV-1 according to IEC:707 shall not be subjected to the needle-flame test, while GB4706.11992 does not have such a provision. There are some differences between Figure 1\Test index\ of this standard and Figure 1\Test index\ of GB 4706.1-1992 in terms of the simulated normal structure.
- Appendix B\"Circuit" in GB4706.1-1992 is written into the main text of the standard. According to the first amendment of IEC335-1 (1991), Appendix B of this standard is changed to\"Appliances powered by rechargeable batteries\" to replace IEC335-2-18 (1984), IEC335-2-19 (1984) and JEC:335-2-20 (1984).
The implementation of this standard will not immediately replace GB4706.11992, because the special safety requirements of various household appliances used in conjunction with this standard will take a considerable amount of time to be fully formulated. Before it is fully completed, this standard only applies to the special safety requirements of newly revised household appliances that are intended to be used in conjunction with this standard. This standard is proposed by the National Technical Committee for the Promotion of Household Appliance Standards and is under the jurisdiction of GB 4706.1 1998
The drafting units of this standard are: China Household Electric Screen Research Institute, Guangzhou Household Electric Appliance Research Institute. The drafting units of this standard are: Guangzhou Electric Safety Inspection Institute of the State Technical Supervision Bureau, Guangdong Kelon Electric Co., Ltd., Haier Group Corporation, Guangdong Aide Electric Group Corporation, Guangdong Midea Electric Group Corporation, Guangdong Shunhua Electric Factory, Guangdong Xigui Group Corporation. The main drafters of this standard are: Zhao Jiarui, Xu Yanrong, Lin Zhili, Ma Dejun, Du Guanglin, Guan Zhihua, Jiang Yi, Luo Jianxie, Huang Yuxian, Zhong Yongquan. This standard was first issued in October 1984 and first agreed in January 1992. This standard is interpreted by the National Technical Committee for Standardization of Household Electrical Appliances. GB 4706. 1 --- 1998wwW.bzxz.Net
IEC Foreword
1) The positive resolutions or agreements of the International Electrotechnical Commission (IEC) in technical aspects are formulated by technical committees in which all interested national committees participate. Therefore, they express an international consensus view as faithfully as possible on the issues involved. 2) They are used internationally in a recommended manner and are followed by national committees. 3) In order to promote international coordination, the International Electrotechnical Commission (IFC) hopes that national committees should adopt IEC standards in their national standards when national conditions permit. All differences between IEC standards and corresponding national standards should be pointed out as clearly as possible in the standards. This standard was formulated by IEC Technical Committee 61: "Safety of household and similar electrical appliances". This standard is based on the following documents:
61(CO)612
Voting report
616(C0)649
Supplement to DIS
61(CO)650
Voting report
G1(CO)667
Full material on the votes taken at the time of adoption of this standard can be found in the voting report shown above. The general requirements (Part 1) are to be used in conjunction with the appropriate specific requirements (Part 2), which contain supplements and amendments to the corresponding clauses in the general requirements to give the relevant requirements for each product. Individual countries may wish to consider the applicability of this standard to appliances not covered by the specific requirements and to appliances designed according to new principles to the extent justified. If several functions of the appliance are covered by several different specific requirements of IEC 335, the relevant specific requirements shall apply separately to each function as far as justified. If applicable, the influence of one function on other functions shall also be taken into account. The other IEC and ISO standards listed in Appendix A are referenced as normative. All annexes except Appendix H are used as normative. Some countries have the following differences:
.2.5.2: The safety extra-low voltage should not exceed 30 (peak 42.4 (USA) -2.8.5: The power disconnection is not considered to be a manual operation (Australia and New Zealand) -3: No DC components are allowed on the neutral line of the appliance (Australia). -4.7; The test environment temperature is 25°C ± 10 C (Japan and the United States). -4.14: Accessible metal parts that are not intended to carry live current (e.g. a metal nameplate or decorative trim on a plastic housing) need not be earthed. Accessible non-metallic parts need only provide basic insulation (USA). 6.1: Class 0 and Class I appliances are not permitted (Australia, Austria, Czech Republic, Finland, France, Germany, Hungary, Ireland, Italy, Netherlands, New Zealand, Poland, Singapore, Sweden, United Kingdom and the former Yugoslavia). -6.2: Protection against harmful immersion of water is determined by a method other than that specified in IEC:529 (United States). .... -7.1 The IP code is not required to be indicated on the label (USA). -7.6: Some of these derivatives are not used (USA). 7.8: Other methods of identifying the neutral conductor terminal and the earth terminal are permitted (USA). -- 7.122. 3 The contact opening distance of tmm is not applicable (Australia, H.N., New Zealand and the United States). : 7.14: Test without a cylinder is used (the United States). -8.1.1: This test does not require a force of 20N to be repeated (the United States). "8.1.1: Protection against contact with live parts of the lamp cap is not required (the United States). .--8.1.2 and 8.1.3: Test pins and test probes are not used (the United States). GB 4706.1—1998
-8.1.5: Built-in appliances, fixed-mounted appliances, and appliances delivered as separate units are not required to be protected by at least basic insulation before installation (USA). ——9: Requires motors to be capable of starting without blowing fast-acting fuses (USA). ~~10.1 and 10.2: Requires positive limits of 5% for heating appliances and 10% for motor-operated appliances, with no negative deviations generally for either (USA)
-11.4, 11.5, and 11.6 .6: Heating appliances and heating elements in combined appliances and circuits are operated at rated input power or rated voltage, whichever is more severe. All other appliances and circuits are operated at rated voltage (USA). 11.8: Table 3: Temperature rise limits for some materials are different (USA), 13.2: Test circuits and some leakage current limits are different (USA), 13.3: Some test voltage values are different because they depend on the voltage (USA). -13.3: A 500VA test transformer is used (USA). 15.1.1 and 15.1.2: The IP system is not used and the tests are different (USA). -----15.3: The tests are conducted at a relative humidity of (88.12)% and a temperature of 32 ± 2°C (USA). -16.2: The tests are conducted at nominal supply voltage and some leakage current values are different (USA). -16.3: Some test voltages and methods are different (USA). 19.1: Circuit protection devices are permitted to provide necessary protection (USA). -19.2~19.4: Normally the tests are conducted at nominal supply voltage or rated input power (USA). 19.13; The temperature rise limits in Table 7 do not apply (USA). -20.1: The stability test at 15° is not conducted and the appliance tested in the overturned position is judged according to the non-positive belt test criteria (USA).
21: The impact force is applied by a falling steel ball instead of a spring impactor (USA). 22.1: The IP system is not used and the test is different from that specified in IEC529 (USA). 22.2: Due to the supply system, the second paragraph of this clause concerning Class 1 single-phase appliances with heating elements cannot be met (France and Norway).
——22.2: Double-pole switches or protective devices are required (Norway). 22.2: For all fixed appliances it is not necessary to disconnect the neutral conductor (USA). -22.2: The supply cord is not required to be equipped with a plug (Ireland and United Kingdom). 22.6: This test is not performed (United States).
22.11 A less stringent requirement for locking arrangements (USA). -22.12: A defined method of fastening is required (USA). 22.14: Sharp edges are evaluated using a sharps test device (USA). 22.35 and 22.36: Metal parts are not normally required to be separated from live parts by double or reinforced insulation (USA). 23.5: The requirements for insulated internal wiring are different (USA). 23.7: Green wire may be used instead of yellow/green bicolor wire (New Zealand and USA). -23.7: This requirement applies only to wiring that is accessible at the point of closed supply connection (USA). -24.1.2 requires a different number of cycles and Note 2 does not apply (USA). 24.1.3 Jiang not applicable (USA),
-24.3; the requirement for 3mm contact spacing does not apply (USA) 25.1: The power cord is not required to be equipped with a plug (Ireland and the United Kingdom) -25.3: The use of a secondary power lead is not allowed (Norway, Sweden, Denmark, Finland and the Netherlands). GB 4706.1-1998
. -25.3: It is not generally allowed to use a terminal block assembly to connect a flexible cord (USA). -25. Lu: The cross-sectional area of the conductor is different (Australia, New Zealand and the United States). -25.8: 0.5mm power cord is not allowed for Class 1 appliances (Australia and New Zealand). -25.10: Green insulation is also allowed (USA). 25.13.2: Two or more layers of separate insulation are not required (USA). -25.16: Completely detachable cord anchorage is allowed (Australia). -25.16: Except for small appliances, a tensile force of 351b is applied and torque test is not usually performed (USA). 26.2: The cross-sectional area is in accordance with the American Standard Wire Gauge (AWG) (USA). : 26.4 and 26.5: This test is only applicable to the wiring terminals connected to fixed wiring (USA) -27.2: Because 1EC685-2-1 is not used.Therefore, the requirements for threaded terminals are different (USA). 28.1: Such tests are not normally required (USA), 29.1: Different electrical distances and electrical spacings may be applicable (USA), -~30.1: The minimum value for the ball pressure test on parts holding live parts is 95 °C, or a temperature rise of 10 K above that in clause 11. For enclosures, the minimum value is 75 °C, or a mold stress test is carried out at a temperature 10 K higher than that in clause 11 (USA). -30.2.1: The ignition test cannot be used to ensure a slow burning rate (USA). -30.2.1: Printed circuit boards operating at alternative mains voltages are required to be of FV-0 or FV.1 material, or of a material that withstands the needle flame test (Australia).
F1.1: This annex applies to motors operating at a voltage not exceeding 30 V (USA). B7.12: Appliances containing non-replaceable batteries shall be marked with an appropriate symbol when the mercury or mercury content of the battery exceeds 0.025% (Sweden and Switzerland). - B21.101: This requirement is different (USA). GB4706.1—1998
IEC Introduction
In the preparation of this International Standard, it has been assumed that the provisions of the standard are to be carried out by persons who are suitably qualified and experienced. In addition, in preparing this standard, TC 61 has taken into account, as far as possible, the requirements of IEC 364 so that the appliance can be installed in accordance with these wiring rules. However, the wiring rules of various countries may be different. This standard recognizes an internationally acceptable level of protection against electrical, mechanical, thermal, fire and radiation hazards for household and similar electrical appliances when they are operated in normal use under the conditions of paying attention to the manufacturer's instructions. It also covers abnormal conditions that may be expected in actual application.
…·A product that complies with the text of this standard will not necessarily be judged to comply with the safety principles of this standard if, when inspected and tested, it is found to have other characteristics that will impair the safety level contained in these requirements. If a product uses materials and structural forms other than those specified in the requirements of this standard, the product may be inspected and tested in accordance with the intent of these requirements: if it is found to be basically equivalent, it can be judged to comply with the safety principles of this standard. The standards involving non-safety aspects of household appliances are: - IEC standards issued by TC59, which involve performance test methods; CISPR11 and CISPR14, which involve radio interference suppression: IEC 555, which involves electromagnetic compatibility,
1 Scope
National Standard of the People's Republic of China
Safety of household and similar electrical appliances
Part 1: General requirements
Safety of houschold and similar eiectrical appliancesPart 1:General rcquirements
GB4706.1-1998
eqv [Ec 335-1:1991
Replaces G 4706.1-1992
This standard involves the safety of household and similar electrical appliances with a rated voltage not exceeding 250 V for single-phase appliances and a rated voltage not exceeding 480 V for other appliances.
These appliances may have motors, heating elements or a combination of them. Appliances which are not intended for domestic use but which may nevertheless constitute a source of danger to the public, for example appliances intended for use by non-professionals in shops, in light industry and on farms, are within the scope of this technical standard. NOTE 1 Examples of such appliances are: commercial and business food supply equipment, cleaning appliances and appliances used in hairdressers' shops. As far as practicable, this standard deals with the common hazards presented by appliances which are encountered by all persons in and around the home. This standard does not take into account:
the use of appliances by unattended young children and disabled persons; situations where young children play with the appliances.
NOTE! : Attention should be paid to the following situations:
For appliances intended for use in vehicles, boats or aircraft, additional requirements may be required. .- For appliances intended for use in tropical applications, special requirements may be required. In many countries, additional requirements are laid down by the national health care department, the department responsible for labor protection, the national water supply department and similar departments. Note 3: This standard does not apply to dry;
Appliances designed for industrial use
Appliances intended for use in special environments where corrosive or explosive gases (such as dust, steam or fumes) are often present. Back-up, television receivers and similar equipment such as recorders and recorders (IEC65): medical equipment (IEC601) +
Hand-held or electric tools (IEC745):
Personal computers and similar equipment (IEC95): Electric blankets, electric heating pads and similar flexible electric heating appliances (IEC967) Electric fence energizers (IFC1011):
--Portable electric tools (IFC:1G20). 2 Definitions
For the purpose of this standard, the following definitions apply.
2.1 Where voltage and current are used, they are effective values (rms) unless otherwise specified. 2.2.1 Rated voltage Taterdvoli.age
Approved by the State Administration of Quality and Technical Supervision on December 25, 1998 and implemented on June 1, 1999
The voltage specified by the manufacturer for the appliance. For three-phase power supply, it is the phase-to-phase voltage. GB 4706. 1 1998
2.2.2 Rated voltage range rated voltage range The voltage range specified by the manufacturer for the performance of the appliance, expressed as its upper and lower limits. 2.2.3 Working voltage working voltage The highest voltage to which the considered part of the appliance is subjected when the appliance is operated at rated voltage and under normal operating conditions. NOTE When determining the working voltage, the influence of transient voltage may be ignored. 2.2.4 Rated input power rated power input power specified by the manufacturer for the appliance. 2.2.5 Rated power input range The power range specified by the manufacturer for the appliance, expressed as its upper and lower limits. 2.2.6 Rated current The current specified by the manufacturer for the appliance.
Note: If the current is not specified for the appliance, the rated current is the current calculated from the rated power input and the rated voltage for electric heating appliances.
For electric appliances, it is the current measured when the appliance is operated at the rated voltage under normal operating conditions.
For medium-connected appliances, it is the current measured when the appliance is operated at the rated voltage under normal operating conditions. 2.2.7 Rated frequency The frequency range specified by the manufacturer for the appliance.
2.2.8 Rated frequency range The frequency range specified by the manufacturer for the appliance, expressed as its upper and lower limits. 2.2.9 Normal operation The state in which the appliance is operating in normal use when it is connected to the power supply. 2.3.1 detachable cord a flexible cord intended for connection to an appliance via a suitable appliance coupler for supply or interconnection. 2.3.2 interconnection cord
interconnection cnrd
an external flexible cord not intended for connection to a central source but supplied as part of a complete appliance. NOTE Examples of interconnection cords are hand-held switches for control purposes, external interconnections between two parts of an appliance and cords for connecting accessories to the appliance or to separate signal circuits.
2.3.3 supply cord supplycord
a flexible cord fixed to the appliance for supplying electricity. 2.3.4 X-type attachment X-type attachment method for connection of a supply cord which enables easy replacement of the supply cord. NOTE
This supply cord may be specially prepared and available only from the manufacturer or its service agency. 1
2A specially prepared cord may also comprise part of the appliance. 2.3.5 Type Y attachment A method of connection of a power cord intended to be replaced by the manufacturer, its service agency or similarly qualified persons. Note: A type Y attachment may use an ordinary cord or a special cord. 2.3.6 Type Y attachment A method of connection of a power cord which cannot be replaced without breaking or damaging the appliance. 2.3.7 Power cord supplies A set of wires which are used to connect the appliance to fixed wiring and are contained in a compartment within the appliance or attached to the appliance. 2.4.1 Basic insulation basic insulation GB 4706.1—1998
Insulation applied to live parts to provide basic protection against electric shock. NOTE Basic insulation need not include insulation specifically intended for functional purposes. 2.4.2 Supplementary insulation Independent insulation applied in addition to basic insulation to provide protection against electric shock in the event of a failure of the basic insulation. 2.4.3 Double insulation Insulation Insulation system consisting of basic insulation and reinforced insulation 2.4.4 Reinforced insulation Single insulation applied to live parts to provide a degree of protection against electric shock equivalent to double insulation under the conditions specified in this standard: NOTE This does not mean that the insulation is a homogeneous body; it may also consist of several layers, but it cannot be tested one by one like supplementary insulation or basic insulation. 2.4.50 Appliances
Apparatus whose protection against electric shock relies on basic insulation. That is, it has no means of connecting conductive accessible parts (if any) to the protective conductor in the fixed wiring of the installation. If the basic insulation fails, the protection against electric shock relies on the environment: Note: Class 0 appliances have either an enclosure of insulating material that can constitute part or all of the basic insulation, or a metal enclosure separated from live parts by appropriate insulation. If the appliance with an insulating material enclosure has means for earthing internal parts, it is considered to be a class 1 appliance, or a class 0i appliance. 2.4.60 Class I appliances are appliances that have at least basic insulation as a whole and have an earthing terminal, but their supply cord does not have an earthing conductor and the plug does not have an earthing contact.
2.4.7 Class I appliances class I appliances appliances whose protection against electric shock relies not only on basic insulation but also on an additional safety precaution. The method for its protection that is sufficient to prevent the accessible conductive parts from becoming charged if the basic insulation fails is to connect the accessible conductive parts to the earthed protective conductor in the fixed wiring of the installation.
Note: This protection includes the protective conductor in the supply cord. 2.4.8|clags appliance
Appliances whose protection against electric shock does not rely on basic insulation but provides additional safety measures such as double insulation or reinforced insulation. Such appliances do not have protective earthing or installation-dependent measures. 1 Such appliances may be of the following types:
a) Appliances having a durable and substantially continuous outer casing of insulating material, which encloses all metal parts except small parts such as nameplates, screws and rivets, which are separated from live parts by insulation at least equivalent to reinforced insulation. Such appliances are called appliances with insulating casings.
b) Appliances having a substantially continuous metal casing, in which double insulation or reinforced insulation is used throughout, are called appliances with metal casings.
c) Appliances which are a combination of types a) and b). 2 The body of a class 1 appliance with an insulating enclosure may be part of an appliance with additional insulation or reinforced insulation, forming part of the additional insulation or reinforced insulation. 3 If an appliance with double insulation or reinforced insulation throughout is provided with a protective measure for earthing, the appliance is considered to be a class 1 minus 01 appliance.
4 Class I appliances may have means of maintaining continuity of the protective conductor, provided that such means are incorporated within the appliance and separated from conductive accessible parts by supplementary insulation.
2.4.9 Class I construction Part of an appliance which relies on double insulation or reinforced insulation for protection against electric shock. 2.4.10 Class 1 appliances Appliances whose protection against electric shock is provided by supplying power at safety extra-low voltage and in which no voltage higher than the safety extra-low voltage is generated. NOTE Appliances intended to operate at safety extra-low voltage but having internal circuits operating at other than safety extra-low voltage are not included within this class and shall comply with separate requirements.
2.4.11 Class construction classconstruction GB 4706. 1 1998
Part of an appliance, the electrical protection of which relies on a safe extra-low voltage and in which no voltage higher than the safe extra-low voltage is generated. 2.4. 12 Creep gc distance The shortest known path measured along the surface of the insulating material between two conductive parts, or between a conductive part and the easily accessible surface of an appliance. 2.4.13 Clearance
The shortest distance between two conductive parts, or between a conductive part and the easily accessible surface of an appliance. 2.5.1 Extra-low voltage extra-low voltage The voltage supplied by a power source inside an appliance, which does not exceed 50 V between conductors and between conductors and earth when the appliance is operated at rated voltage.
2.5.2 Safety extra-low voltage safetycxtralwoltuge The voltage between conductors and between conductors and earth shall not exceed 42V, and the load voltage shall not exceed 50V. When the safety extra-low voltage is obtained from the power grid, it shall pass through a safety isolating transformer or a converter with separate windings. In this case, the insulation of the safety isolating transformer and the converter shall comply with the requirements of double insulation or reinforced insulation. Note: The voltage limits specified here assume that the safety isolating transformer is powered at its rated voltage. 2.5.3 Safety isolating transformer satety isolatingItansformer A transformer that supplies a safety extra-low voltage to an appliance or circuit and that electrically isolates its input winding from the output system by insulation at least equivalent to effective insulation or reinforced insulation. 2.6.1 Portable appliance portahle appliance An appliance that is moved during operation or a non-stationary appliance with a mass of less than 18 kg. 2.6.2 Hand-held appliance A portable appliance intended to be held in the hand during active use. If it has a motor, the appliance constitutes an integral unit. 2.6.3 Stationary appliance A fixed appliance or non-portable appliance.
2.6.4 Fixed appliance An appliance that is fastened to a support or fixed in a specific position for use. NOTE: Adhesive is used as a means to fasten fixed-mounted appliances to the support. 2.6.5 Built-in appliance A fixed appliance intended to be installed in a kitchen cabinet, a reserved space in the wall or a similar location. 2.7.1 Non-detachable part A part that can be removed or opened only with the help of a tool or a part that can complete the test of 22.11. 2.7.2 Detachable part A part that can be removed or opened without the help of a tool, a part that the manufacturer tells the user to remove (even if it requires labor to remove) or a part that cannot complete the test of 22.11.
1 A part that must be removed for installation is not considered removable even if the manufacturer tells the user not to remove it. 2 A part that can be removed without the aid of a tool is considered a removable part. 2.7.3 Tool
A screwdriver, coin or any other object that can be used to turn a screw or similar fixing device. 2.8.1 Thermostat
A temperature-sensitive device with a fixed or adjustable operating temperature that, during normal operation, maintains the temperature of the controlled object between certain limits by automatically opening or closing an electrical circuit.
2.8.2 ThermostatA temperature-sensitive device with a fixed or adjustable operating temperature that, during normal operation, opens or closes an electrical circuit when the temperature of the controlled object reaches a predetermined value. GB 4706.1 -1998
Note: During the normal operation cycle of the appliance, it does not cause reverse operation. It may or may not require manual reset. 2.8.3 Thermal cut-out A device that limits the temperature of the controlled device by automatically cutting off the circuit or reducing the current during abnormal operation. Its structure prevents the user from changing its setting value.
2.8.4 Self-resetting thermal cut-out A thermal cut-out that can directly restore the current after the relevant parts of the appliance are fully cooled. 2.8.5 Non-self-resetting thermal cut-out A thermal cut-out that requires manual reset or replacement of parts to restore the current. Society: Manual includes cutting off the power supply.
2.8.6 protective device protective device A device that operates under abnormal operating conditions and whose action prevents a hazardous situation. 2.8.7 Thermal link A thermal cutout that can only operate temporarily and requires replacement of all thermal cutouts afterwards. 2.9.1 All-pole disconnection For single-phase appliances, the disconnection of both supply conductors caused by a single-actuation action; or for three-phase appliances, the disconnection of all supply conductors except the earth conductor caused by a single-actuation action. The protective earth conductor is not considered to be a supply conductor. 2.9.2 Off position
is a stable position of a switching device in which the circuit controlled by the switch is disconnected from its supply. NOTE The off position does not imply all-pole disconnection. 2.9.3 Accessible part Parts or surfaces that can be touched by the test finger shown in Figure 1, including all conductive parts connected to accessible metal parts. 2.9.4 Live part Conductors or conductive parts that are carried by the conductors or conductive parts in normal use, including the neutral conductor as a rule, but excluding the PEN conductor. NOTES 1 Accessible and inaccessible parts that comply with 8.1.4 are not considered to be live parts. 2 PEN conductor is the protective earthing neutral conductor that combines the functions of the protective conductor and the neutral conductor. 2.9.5 Visibly glowing heating element A heating element that is partially or completely visible from the outside of the appliance and that has a temperature of at least 650 °C when the appliance is in normal working conditions and is operated at rated power input until steady state conditions are established. 2.9.6 Heating appliance An appliance incorporating a heating element but not incorporating a motor. 2.9.7 Motor-operated appliance An appliance incorporating a motor but not incorporating a heating element. NOTE: Magnetically driven appliances are considered to be motor-operated appliances. 2.9.8 Combined appliances An appliance equipped with an electric motor and an electric heating element. 2.9.9 User maintenance Various maintenance tasks specified by the appliance manufacturer to be performed by the user, the contents of which are written in the instruction manual or marked on the appliance. 2.10.1 Electronic component An electronic component is a component that conducts electricity mainly through the movement of electrons in a vacuum, gas or semiconductor. Light indicators are not considered electronic components. 2.10.2 Electronic circuit An electronic circuit equipped with at least one electronic component.
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