GB 4706.51-2001 Safety of household and similar electrical appliances - Particular requirements for commercial electric food holding cabinets
Some standard content:
GB 4706.51—2001
All technical contents of this standard are mandatory. Former
This standard is equivalent to the second edition of IEC60335-2-49:1995 Household and similar electrical appliances - Safety - Part 2: Particular requirements for commercial electric food holding cabinets and its amendments No. 1 (1996) and No. 2 (1998). This standard should be used in conjunction with GB4706.1—1998 Household and similar electrical appliances - Safety - Part 1, General requirements. The part of this standard marked with "applicable" indicates that the corresponding provisions in GB4706.1-1998 are applicable to this standard; the part of this standard marked with "replacement" or "modification" shall be subject to the provisions in this standard; the part of this standard marked with "addition" indicates that in addition to complying with the corresponding provisions of GB47U6.1-1998, it shall also comply with the provisions added in this standard. This standard is proposed by the China General Chamber of Commerce. This standard is under the jurisdiction of the Commercial Electrical Food Processing Service Equipment Subcommittee of the National Technical Committee for Standardization of Household Electrical Appliances. The reform unit of this standard is the National Food Service Machinery Quality Supervision and Inspection Center. The main drafters of this standard are Zhang Chengbin, Zhang Chunsheng, Xia Xiaoli, Dun Yulan, and Wang Yubo. GB4706.51—2001
IEC Preface
1) The International Electrotechnical Commission (IEC) is a global standardization organization composed of the electrotechnical committees of the member countries (IEC National Committees). The mission of IEC is to promote international cooperation on all issues related to standardization in the electrical and electronic fields. To this end, IEC, in addition to other activities, also promulgates international standards. The formulation of these standards is entrusted to technical committees. Any IEC National Committee interested in the issues involved may participate in this work. International organizations, government agencies and civil society groups that have ties to IEC may also participate. IEC and the International Organization for Standardization (ISO) work closely under the conditions stipulated in the agreement between the two organizations. 2) Formal resolutions or agreements of IEC on technical issues, formulated by technical committees participated by all national committees with special concerns, express as closely as possible the international consensus on the issues involved. 3) The standards, technical reports or manuals they propose are for international use in the form of recommendations and are accepted by the National Committees in this sense.
4) In order to promote international unification, IEC National Committees The committee agreed that IEC International Standards should be applied as clearly as possible to national and regional standards. Any inconsistencies between IEC standards and corresponding national and regional standards should be clearly stated in the national and regional standards.
5) IEC does not provide approval marks and does not accept responsibility for any equipment claiming to conform to one of its standards. This part of the IEC 60335 series of standards has been prepared by Subcommittee 61E "Safety of Commercial Electrical Food Processing and Serving Equipment", of IEC Technical Committee 61\Safety of Household and Similar Electrical Appliances. It constitutes the second edition of IEC 60335-2-49, superseding the first edition published in 1988 and its amendment No. 1 (1990). The text of this publication is based on the following documents: DIS
61E(CO)132
Voting Report
61E/141/RVD
Details of the voting for the approval of this standard can be found in the voting report indicated in the table above. This second part is intended for use in conjunction with the latest version of IEC 60335-1 and its amendments. It is based on the third edition of this standard (1991).
This Part 2 supplements or modifies the corresponding clauses of IEC 60335-1 in order to transform it into the IEC standard: Safety requirements for commercial electric food holding cabinets.
If individual clauses of Part 1 are not mentioned in this Part 2, they still apply if it is reasonable. When "addition", "modification" or "replacement" is stated in this standard, the relevant text in Part 1 should be modified accordingly. Note: In this standard:
1) The following typographical fonts are used:
——Requirement itself in roman!
——Test specification: italic,
Notes: small roman.
Specific words in the text are defined in Chapter 2
2) The clauses, notes and figures added to IEC 60335-1 should be numbered starting from 101. 1 Scope
National Standard of the People's Republic of China
Safety of household and similar electrical appliances
Partial requirements for
conmercial electric hot cupboardsSafety of household and similar electrical appliancesPartlcular requirements for
conmercial electric hot cupboardsGB4706.1-1998This chapter is replaced by the following contentGB 4706. 51-2001
idt 1EC 60335-2-49: 1995
This standard covers the safety of electric hot cupboards not intended for household use. For single-phase appliances connected to one phase and neutral, the rated voltage shall not exceed 250 V and for other appliances shall not exceed 480 V. Food hot cupboards with heated tops, heated display cabinets, heated ceramic tableware dispensers, and heated shelves and plates are also within the scope of this standard.
NOTE 1: Such appliances are used, for example, in hotels, food shops, hospitals and similar commercial enterprises. The electrical parts of appliances using other forms of energy are also within the scope of this standard. For the sake of practicability, this standard deals with the common hazards caused by such appliances. NOTE 2: The following should be noted:
For appliances intended for use exclusively in vehicles, ships or aircraft, additional requirements may be necessary; for appliances intended for use exclusively in tropical countries, special requirements may be necessary; in many countries, additional requirements prescribed by national health, labor protection, water supply and other similar authorities should also be considered. For appliances intended for use exclusively in the open air, additional requirements may be necessary. This standard does not apply to:
Appliances designed for industrial use;
--Appliances intended for use in places where special conditions often occur, such as the presence of corrosive or explosive gases (dust, steam or flammable gases);
Appliances for continuous operation for mass production of food; - Water bath warmers (IEC60335-2-50). 2 Definitions
This chapter in GB4706.1-1998 is applicable except for the following. 2.2.4 This clause is added with the following content:
Note: The rated auxiliary power is the sum of the input power of all individual components in the appliance that can work simultaneously. When there are several such combinations, the rated auxiliary power is determined by the combination of the maximum input power. 2.2.9 This clause is replaced by the following content:
Normal operation
The appliance operates under the following conditions:
The appliance is not loaded and all controllers for user operation are adjusted to the highest value. Approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on November 2, 2001 and implemented on June 1, 2002
GB 4706. 51—2001
If the appliance cannot be operated under no-load conditions, the manufacturer's instructions shall be observed. Doors, covers or hoods, if any, shall be placed in their normal positions. The motor installed in the appliance shall operate as expected under the worst conditions that may occur in normal use as considered in the manufacturer's instructions.
The following clauses are added to this chapter:
2.2.101 Hol cupboard An appliance used to keep hot food warm and to warm ceramic tableware. 2.2.102 Heated top
The top layer of a food holding cabinet, used to maintain the necessary temperature. It may be heated indirectly by the heating element of the food holding cabinet or directly by a separate heating element.
2.2.103 Heated display case An insulated cabinet for displaying food, which can supply heated food from the exhibits in the cabinet. 2.2.104 Heated crockery dispenser An appliance specially used for storing, heating and dispensing tableware. 2.2.105 Installation wall A special structure that includes supply facilities. The supply facilities are applicable to appliances installed together with the structure. 3 General requirements
This chapter in GB4706.1-1998 is applicable except for the following contents. The following contents are added to this chapter:
Note 101: The DC component of the neutral line of the appliance is limited. (Australia) 4 General conditions for testing
GB4706.1-1998, except as follows. 4.10 This clause is supplemented with the following:
An appliance installed in a group of other appliances or fixed to a mounting wall shall be enclosed to obtain protection against electric shock or harmful ingress of water equivalent to that obtained when installed in accordance with the instructions for use accompanying the appliance. Note: Appropriate sub-bars or additional equipment may be required for testing. This clause is supplemented with the following:
4.101 The appliance is tested as an electric heating appliance even if it is equipped with a motor. 4.102 Appliances assembled with other appliances or equipped with other appliances are tested in accordance with the requirements of this standard. Other appliances are operated simultaneously in accordance with the requirements of the relevant standards.
If the entire appliance or parts of it are used for different functions covered by different standards, the relevant standards shall be applied to their respective functions separately, as far as reasonable.
5 Blank
6 Classification
This chapter in GB4706.1—1998 is applicable except for the following contents. 6.1This clause is replaced by the following contents:
Regarding the category of protection against electric shock, the appliance shall be of Class I. The appliance is checked for compliance by visual inspection and relevant tests. Past: Class 0 is officially recognized. (Japan)6.2This clause is supplemented with the following contents:
GB 4706.51—2001
Furthermore, for appliances installed in kitchens, appropriate protection levels against harmful ingress of water are required according to their installation height. (Laws) The following clauses are added to this chapter:
6.101 According to the degree of protection against temperature rise caused by the installation conditions, appliances shall be classified as follows: - appliances installed alone,
- appliances installed in a group of other appliances. Previously: There were no additional requirements for appliances installed in a group of other appliances. 7 Marking and instructions
This chapter in GB4706.1-1998 is applicable except for the following contents. 7.1 The following contents are added to this clause:
In addition , the appliance shall be marked with the following:
For appliances intended to be connected to a water supply, the water pressure or pressure range shall be expressed in kPa, unless otherwise stated in the instructions. 7.6 Add the following content to this clause:
Add the following symbol:
7.12 Add the following content to this clause:
Equipotential bonding (IEC60417-5021-a)1)
For appliances equipped with rollers or similar devices, the instructions shall also indicate the maximum load capacity of the appliance, expressed in kg. 7.12.1 This clause is replaced with the following content:
The appliance shall be accompanied by instructions detailing the special precautions necessary for installation and user maintenance, such as cleaning, etc. Instructions shall also be provided.
Add the following content here:
For appliances installed in a group of other appliances and for appliances fixed to a mounting wall, detailed instructions shall be provided to ensure adequate protection against electric shock and harmful ingress of water. If the controls of more than one appliance are combined in a single space, detailed installation instructions shall be provided. www.bzxz.net
For appliances permanently connected to fixed wiring and appliances in which the leakage current may exceed 10 mA, particularly when disconnected or out of service for long periods, or when installed for the first time, the instructions shall provide recommendations on the ratings of the protective devices to be installed, i.e. earth leakage protection relays. If the appliance is not spray-proof, clear and detailed instructions shall be provided with the appliance to the user stating that the appliance must not be cleaned by a jet of water.
Compliance is checked by inspection.
7.12.4The following is added to this clause:
For built-in appliances with a separate control panel for use with several appliances, the instructions for use shall state that the control panel may only be connected to designated appliances to avoid possible hazards. 7.15 The following is added to this clause:
If it is not possible to mark fixed appliances so that they can be seen after installation, the corresponding information should also be written in the instructions for use or on an external label that can be fixed near the appliance after installation. Note: Built-in appliances are an example of such fixed appliances. The following clause is added to this chapter:
7.101 Equipotential bonding terminals shall be marked with equipotential bonding symbols. (See 7.6) These markings shall not be marked on bolts, removable washers or other parts that may be removed when making conductor connections. Compliance is checked by inspection.
1) See [EC60417:1973, Graphical symbols for use on equipment - Compilation of indexes, introductions and loose-leaf printed matter. 8 Protection against contact with live parts
GB 4706.51—2001
The contents of this chapter in GB 4706.1—1998 are applicable. 9 Starting of motor-operated appliances
9.1 In order to comply with the requirements of Clause 11, fan motors used for cooling shall be capable of starting under all voltage conditions likely to occur in actual use. Compliance is checked by starting the motor three times at 0.85 times the rated voltage. The motor is at room temperature at the start of the test and each start shall be made under conditions in which the motor is ready to start normal operation or, for automatic appliances, under conditions at the beginning of a normal operating cycle. Between two consecutive starts, the motor is allowed to come to a standstill. When the motor is not equipped with a centrifugal starting switch, the appliance shall be repeated at 1.06 times the rated voltage. In all the above cases, the motor shall be capable of starting and shall operate in a manner that does not affect safety and its overload protection device shall not operate. Note: During the test, the supply voltage shall not drop by more than 1.10 Input power and current
G This clause of 4706.1-1998 applies except as follows. 10.1 The following content is added to this clause:
Note 101: For appliances with more than one heating element, the total power input can be determined by measuring the power input of each heating element separately. (See 2.2.4)
11 Heating
This chapter in GB4706.1-1998 is applicable except for the following content. 11.2 The following content is added to this clause:
Appliances fixed to the floor and appliances with a mass greater than 40 kg and not equipped with rollers, castors or similar devices shall be installed in accordance with the manufacturer's instructions. If no instructions are provided, it is assumed that these appliances are usually placed on the ground for use. 11.4 This clause is replaced by the following content:
The appliance is operated under normal working conditions so that its total power input is 1.15 times the rated power input. If it is not possible to connect all heating elements at the same time, each combination shall be tested under the conditions that the switch configuration allows. During the test, the circuit should be connected to the highest load that can be achieved in each switch configuration.
If the appliance is equipped with a controller that limits the total input power, the test is carried out with any combination of heating elements that can be selected by the controller to apply the most severe conditions.
If the temperature rise of the motor, transformer or electronic circuit exceeds the limit value, the appliance is repeated at 1.06 times the rated voltage. At this time, only the temperature rise of the motor, transformer or electronic circuit is measured. 11.7 This clause is replaced by the following content,
The appliance is continuously operated until a stable state is established. 12 Blank chapter
13 Leakage current and electrical strength at working temperature This chapter in GB 4706.11998 is applicable except for the following content. 13.2 The following content is modified in this clause:
The following content replaces the permissible value of leakage current for Class I stationary appliances: For appliances connected by a pair of flexible cords and plugs: 1 mA/kW based on the rated input power of the appliance, the maximum limit is 10 mA. For other appliances: 1 mA/kW based on the rated input power of the appliance, no maximum limit. Note 101, the limits of leakage current are different. (Japan) The following content is added in this clause:
GB 4706. 51-2001
When the appliance is equipped with Class I or subclass structural components, the leakage current of these components shall not exceed the values given in GB4706.1. 14 Blank
15 Moisture resistance
This chapter in GB4706.1-1998 is applicable except for the following content. 15.1.1 The following content is added to this clause:
In addition, IPXo, IPX1, IPX3 and IPX4 appliances shall be subjected to the following splash test for 5 minutes. The water pressure shall be adjusted so that the water rises 150 mm from the bottom of the bowl during the test using the device shown in Figure 101. For appliances that are normally used on the ground, the bowl is placed on the ground; for all other appliances, the bowl is placed on a horizontal surface 50 mm below the lowest point of the appliance. The bowl is then moved around the appliance so that water splashes onto the appliance from all directions. Care should be taken that the water does not spray directly onto the appliance. 15.1.2 The content of this condition is modified as follows: Appliances that are normally used on a tabletop shall be placed on a support surface, the dimensions of which on each side are 15 cm ± 5 cm larger than the dimensions of the orthographic projection of the appliance on the support surface.
15.2 This clause is replaced by the following:
The construction of the appliance shall be such that spillage of the body in normal use will not affect its electrical insulation. Compliance is determined by the following test: Appliances with X-type connections, except those equipped with specially prepared flexible cords, shall be equipped with the lightest permissible flexible cable, or with a flexible cord of the minimum cross-sectional area specified in 26.2. Other appliances shall be tested in the delivery state. For appliances with inlet ports, the matching connector may be snapped in place or not inserted during the test, whichever is more unfavorable. Remove the removable parts.
Pour 1 L of cold water containing approximately 1% NaCl evenly over the center of each heating surface for 1 min: Note: Ceramic bone dispensers are not tested. The appliance shall then be subjected to the electrical strength test of 16.3, and visual inspection shall show that there is no trace of water on the insulation that could reduce the creepage distances and electrical clearances below the values specified in 29.1. 15.3 The following content is added to this clause:
Note 101: If it is not possible to put the entire appliance in a suitcase, the parts containing electrical components shall be tested separately, but attention shall be paid to the conditions inside the appliance. The following clause is added to this chapter:
15.101 Appliances equipped with a water switch for filling or cleaning should be constructed so that the water flowing from the water switch cannot contact live parts.
Compliance is determined by the following test: The appliance is connected to a water source that meets the maximum water supply pressure indicated by the manufacturer. The devices controlling the water inlet are all opened for 1 min. The tiltable materials and movable parts, including the cover, are tilted or placed in the most unfavorable position. The rotatable outlet pipe of the water switch is positioned so that the water flows to those parts that will produce the most unfavorable results. The appliance shall then be subjected to the electrical strength test specified in 16.3. 16 Leakage current and electrical strength
This chapter in GB4706.1-1998 is applicable except for the following content. 16.2 The following amendments are made to this clause:
Replace the permissible value of leakage current for Class I stationary appliances with the following content: - For appliances connected to cords and plugs: 2 mA/kW based on the rated input power of the appliance, with a maximum limit of 10 mA: For other appliances: 2 mA/kW based on the rated input power of the appliance, with no maximum limit. Note 101: The limits of leakage current are different. (Japan) 17 Overload protection of transformers and related circuits GB 4706.51—2001
The contents of this chapter in GB 4706.1—1998 are applicable. 18 Durability
The contents of this chapter in GB 4706.1—1998 are not applicable. 19 Abnormal operation
This chapter in GB4706.1—1998 is applicable except for the following contents. 19.1 This clause is supplemented with the following:
In addition, controls or switches for adjusting different set values shall be adjusted to the most unfavorable position. The different set values correspond to different functions of the same part of the appliance. The different functions are specified by different standards and have nothing to do with the instructions for manufacture. 19.2 This clause is supplemented with the following:
The fan motor is disabled.
The door or lid is opened or closed, whichever is the less unfavorable. The surface with the heating element installed inside and the heating top surface indirectly heated by the heating element of the food holding cabinet are covered with a layer of felt with a thickness of 25 mm and a mass per unit area of 4k/m2 ± 0.4 k/m2. Note: The surface heated by a heat radiation source not installed in the surface is not covered with felt. Removable reflectors and similar removable parts are placed in any position or removed, whichever is more unfavorable. 19.4 This clause is supplemented with the following content:
101: In normal use, the main contacts of the contactor used to connect or disconnect the heating element are fixed in the \on (0N)\ position. If two contactors are operated independently, or one contactor controls two independent sets of main fuses, these contacts are locked in the "on (()N)\ position in turn. 19.8 This clause adds the following content:
The appliance shall be tested in accordance with 19.7 to determine whether it is qualified. 20 Stability and mechanical hazards
This chapter in GB4706.1-199R is applicable except for the following content. 20.1 This clause adds the following content:
When testing appliances equipped with doors, covers, brackets and other accessories, the doors are opened or closed, the brackets are fully or partially pulled out, and the covers, covers and other accessories are installed or removed, all of which are more unfavorable conditions. Appliances equipped with wheels or similar devices are also subjected to the following test: The ceramic tableware dispenser is equipped with plates and dishes so that the load is one-third of the load capacity indicated by the manufacturer. The plates are placed on the highest part of the appliance that can be used, and the used The media shall be in accordance with the provisions of EC60436. If the dairy manufacturer specifies special media, such media shall be used. Other appliances shall also be loaded with a load of one-third of the load capacity indicated by the manufacturer, and the load shall be placed on the highest part of the appliance available for use.
When testing appliances equipped with doors, lids or covers and other accessories, the doors shall be opened or closed, and the lids, covers and other accessories shall be installed or removed, and the more unfavorable conditions shall be taken.
Then the appliance is placed on the most unfavorable cover close to an edge with a height equal to half the weight of the wheel plus 10mm. If the rollers have different sizes, the most unfavorable edge height shall be selected.
A force equal to 8% of the full load mass of the appliance is applied horizontally in the most unfavorable direction to the middle of the top edge of the appliance, but not higher than 900mm.
The appliance should not tilt.
20.2 This clause adds the following content:
GB 4706. 51—2001
If the fan motor can operate when the appliance door is open, the moving parts of the appliance motor and fan should be enclosed or adjusted to provide adequate protection against damage during normal operation, including cleaning. It should not be possible to touch the moving parts of the fan. Compliance is checked by applying a force of 10N using the test probe in Figure 3 of GB4706.1-1998. The following clause is added to this chapter:
20.101 Protective devices installed on motor and fan assemblies to meet the requirements of 20.2 should not be removable parts unless the following conditions are met:
- An appropriate interlocking device is installed to prevent the motor or fan from operating with the protective device removed. The protective device constitutes an integral part of the appliance.
Compliance is checked by inspection and manual adjustment. 21 Mechanical strength
GB 4706. 1—1998 This chapter in GB4706-1-1998 is applicable except for the following contents. This chapter adds the following contents:
Note 101, for appliances intended to be installed in kitchens, different impact energy values can be used according to the height of the impact point. (French Engineering 22 Structure
This chapter in GB4706-1-1998 is applicable except for the following contents. 22.15 This clause adds the following contents:
Appliances for transporting food or other articles should be equipped with appropriate devices to protect the power cord from damage during transportation. This chapter adds the following clauses:
22.101 Appliances should be protected so that moisture or grease does not accumulate to a degree sufficient to affect the creepage distance and the original value of the electrical room. Compliance is determined by visual inspection.
22.102 Thermal circuit breakers used to protect circuits with electric heating elements and circuits for protecting motors that may cause danger if accidentally started should be non-automatic reset, free tripping type and should be able to disconnect from the power supply at all poles. For ball-head and capillary type thermal cut-outs which operate during the tests of clause 19, the rupture of the capillary tube shall not affect compliance with the requirements of clause 19.13.
Compliance is checked by inspection, by manual test and by breaking the capillary tube. NOTE Care should be taken to ensure that the capillary tube is not closed when broken: 22.103 Lights, switches or contacts indicating danger, warning or similar situations shall only be red. Compliance is checked by inspection.
22.104 Appliances fitted with wheels or similar devices shall have an effective locking mechanism when they are stationary. Compliance is checked by inspection and by the following test. The appliance, fully loaded in accordance with the manufacturer's instructions, is placed on a surface inclined at 10° to the horizontal and the locking mechanism is locked. The appliance shall not move.
NOTE: A small amount of movement of not more than 400 mm is permitted when the locking mechanism is locked. 22.105 Portable appliances shall be constructed so as to prevent a hazard caused by objects placed on a table or on the floor penetrating the bottom surface. Compliance is checked by inspection and, if necessary, by measurement. Note: For appliances without legs, the requirements are considered to be met if the distance between each live part and the supporting surface measured through any opening is not less than 6 mm. For appliances equipped with legs and intended for use on a table, this distance is extended to 10 mm; for appliances intended for use on the floor, this distance is extended to 20 mm. 23 Internal wiring
This chapter in GB 4706.1-1998 is applicable except for the following contents. 23.3 This clause is added with the following contents:
GB 4706. 51-2001
When the capillary tube of the thermostat tends to be bent in normal use,The following apply: GB 4706.1 applies when a capillary is assembled as a part of internal wiring; a single capillary shall be bent 1 000 times at a rate not exceeding 30 times per minute. Note 101: In the above case, if it is impossible to move the moving parts of the apparatus at the given rate due to reasons such as the quality of the mail, the bending rate may be reduced.
After the bending test, the capillary shall not show any signs of damage within the meaning of this standard and any damage that would impair its further use. However, if a single damage to the capillary renders the apparatus inoperable (fail-safe), the single capillary shall not be tested and the capillary installed as a part of internal wiring shall not be checked for compliance. In this case, compliance is checked by breaking the capillary. Note 102: Care should be taken to ensure that the capillary does not seal when broken. 24 Components
This clause in GB 4706.1-1998 applies except as follows. The following clauses are added to this chapter:
24.101 Connectors fitted to appliances shall not contain thermostats. Compliance is checked by inspection.
25 Electrical connections and external flexible cords
This chapter in GB4706.1-1998 is applicable except for the following. 25.3 The following clause is added to this clause:
Fixed appliances and appliances with a mass greater than 40 kg and not equipped with rollers, castors or similar devices shall be constructed to allow the appliance to be installed in accordance with the manufacturer's instructions before the power cord is connected. The following clause is added to this clause:
Terminals used for permanent connection of cables to fixed wiring may also be suitable for type X connection of power cords. In this case, the appliance shall be equipped with flexible cord fixtures that comply with the requirements of 25.16. If the appliance is equipped with a set of terminals for connecting flexible cords, these terminals shall be suitable for type X connection of flexible cords. In both cases, the instructions shall provide detailed information on the power cord. The following content is added to this clause:
The connection of the power cord of a combined appliance can be completed before the appliance is installed. Compliance is determined by visual inspection.
25. The following content is amended to this clause:
The following content is used to replace the specified power cord type: The power cord shall be an oil-resistant flexible sheathed cable, not lighter than ordinary chloroprene rubber or other equivalent synthetic rubber sheathed soft cord (designated grade 57 in IEC 245).
26 Terminals for external conductors
The contents of this chapter in GB4706.1-1998 are applicable. 27 Grounding measures
This chapter in GB4706.1-1998 is applicable except for the following contents. 27.2 The following content is added to this clause
Stand-standing appliances shall be equipped with a terminal for connecting external equipotential conductors. The terminals shall maintain effective electrical contact with all fixed exposed metal parts of the appliance and shall be capable of connecting conductors with a nominal cross-sectional area of up to 10 mm. The terminals shall be located in a position convenient for connection to the combined conductors after the appliance is installed. Note 101: Small fixed exposed metal parts, such as plates, etc., without strips, screws and connections, shall be in electrical contact with the terminals. The provisions of this chapter in GB 4706.1-1998 shall apply. Electrical distances, electrical spacings and insulation penetration distances 29 The provisions of this chapter in GB4706.1-1998 shall be applicable. Heat resistance, flame resistance and electrical tracking resistance This chapter in GB4706.1-1998 shall be applicable except for the following. 30.2.1 The following changes are made to this clause:
The test temperature of the glow-wire test described in Appendix K is 650℃. 30.2.2 The following changes are made to this clause
Note: The appliance should be regarded as an appliance used without a ventilator. 30.3 The following additions are made to this clause:
Note 101: Switchgear with moving contacts, except those that are manually operated and intended to be operated only in abnormal operation, are regarded as being subject to extremely severe working conditions.
In addition, other parts made of insulating materials are also regarded as being subject to extremely severe working conditions, unless their enclosure and placement are unlikely to cause environmental contamination; in this case, the requirements for environmental working conditions apply. 31 Rust prevention
The contents of this chapter in GB4706.1-1998 are all applicable. Radiation, toxicity and similar hazards
The contents of this chapter in GB4706.1-1998 are all applicable. GB 4706.51—2001
Figure 101 Splashing device
Unit: mraThe contents of this chapter in GB 4706.1-1998 are applicable. Radiation, toxicity and similar hazards
The contents of this chapter in GB 4706.1-1998 are applicable. GB 4706.51-2001
Figure 101 Splashing device
Unit: mraThe contents of this chapter in GB 4706.1-1998 are applicable. Radiation, toxicity and similar hazards
The contents of this chapter in GB 4706.1-1998 are applicable. GB 4706.51-2001
Figure 101 Splashing device
Unit: mra
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