GB 4706.34-1996 Safety of household and similar electrical appliances - Special requirements for commercial electric steamers
Some standard content:
GB4706.34-1996
Foreword
This standard is equivalent to IEC335-2-46 "Safety of Household and Similar Electrical Appliances Part 2: Special Requirements for Commercial Electric Steamers" (1986 edition) and Amendment No. 1 (1990). This standard should be used in conjunction with GB4706.1-92 "General safety requirements for household and similar electrical appliances".
The safety standards for household and similar electrical appliances consist of two parts. The first part is the general requirements, and the second part is the special safety requirements for the product.
The part of this standard that says "applicable" means that the corresponding provisions in GB4706.1-92 are applicable to this standard; the part of this standard that says "replace" or "modify" should be based on this standard. The provisions in the standard shall prevail; the part marked "added" in this standard means that in addition to complying with the corresponding provisions of GB4706.1-92, it must also comply with the added provisions in this standard. This standard is proposed by the Industrial Department of the Ministry of Domestic Trade of the People's Republic of China. This standard is jointly administered by the National Commercial Machinery Standardization Technical Committee and the National Household Appliances Standardization Technical Committee. This standard was drafted by: National Catering Service Machinery Quality Supervision and Inspection Center. The main drafters of this standard: Wang Shujing, Xia Xiaoli, Chen Zhangying, Han Yiguan. GB4706.341996 | | tt | There is an international consensus on the issue. 2) These resolutions or agreements are in the form of recommendations for international use and are accepted by national committees in this sense. 3) In order to promote international unification, IEC hopes that IEC standards should be adopted to the extent that its domestic circumstances permit. content as their country's regulations. Any differences between the standards recommended by IEC and the corresponding national standards should be clearly stated in the national standards as much as possible. GB4706.34-1996 | | tt | Developed by committee. It forms the first edition of the IEC335-2-46 publication. The text of this publication is determined in accordance with the following documents: June Law
61E(CO)20
Further information can be found in the voting report shown in the table above. Voting Report
61E(CO)24
This second part is intended for use in conjunction with the IEC335-1 publication. It is based on the second edition (1976), second printing (1983), including revisions No. 1 (1977), No. 2 (1979) and No. 3 (1982), and is based on revisions No. 4 (1984), No. 5 (1986) and No. 6 (1988) were enacted. This should be taken into account in future new versions of IEC335-1 publications or their modifications. This Part II supplements or modifies the corresponding provisions in the IEC335-1 publication in order to convert the publication into the IEC standard: Safety Requirements for Commercial Electric Steamers (First Edition).
If individual terms of Part One are not mentioned in Part Two, these terms will still apply if reasonable. When the description of this first edition is "added", "modified" or "replaced", the relevant requirements, test specifications or instructions in Part One should be modified accordingly. The following differences exist in some countries:
- Ordinary appliances are not allowed (Article 6.1); only X connections are allowed (Article 25.4);
- A lower limit for leakage current is specified (Article 13.2 and 16.2); an anti-siphon device is required.
In this publication:
1) Use the following typography:
Requirement itself: Roman;
Test specification: italic;
Instructions: Small Roman font.
2) The added clauses or charts in the first part should be numbered starting from 101; the added appendices are marked with letters AA, BB, etc. This standard refers to the following IEC publication:
Publication No. 529 (1976): Classification of the degree of protection provided by enclosures. 1 Scope
National Standard of the People's Republic of China
Safety of household and similar electrical appliances
Special requirements for commercial electric steamers
Safety of household and similar electrical appliancesParticular requirements for commercial electricsteamcookers
This chapter in GB4706.1--92 is applicable except for the following content. 1.1 This article is replaced by the following:
GB4706.34-1996
idt IEC 335-2-46:1990
This standard applies to commercial electric steamers not for general household use Pots and steam generators for any other purpose are not included. The electrical parts of appliances that utilize other forms of energy are also within the scope of this standard. This standard does not apply to:
Industrial steamers:
Steamers for continuous operation for mass production of food; - Steamers with electrode heaters
When corrosive Appliances used in places with special conditions such as explosive gases (dust, steam or gas). Additional requirements may be required for appliances used on vehicles, vessels or aircraft. Special requirements may be required for appliances used in tropical countries. Additional requirements are required for pressure appliances.
Additional requirements set by the health, water supply and labor protection authorities of many countries should also be considered. 2 Definition
Chapter 2 in GB4706.1-92, except for the following content, shall apply. 2.2.4 The following content is added to this article:
The rated input power is the sum of the rated input powers of all individual components in the appliance that can work simultaneously: among several such combinations that may exist, the maximum input power is provided combination to determine the rated input power. 2.2.19 The following content is added to this article:
Category 1 used in this standard should be understood as Category I structural components. 2.2.20 The following content is added to this article:
Class II used in this standard should be understood as Class II structural components. 2.2.29 This article is replaced by the following:
Full heat release condition means:
An appliance works in accordance with the manufacturer's instructions, and all controls for user operation are adjusted to the highest setting values, until operating temperature is reached. Then, if possible, readjust them to the lowest setting that maintains that temperature. An appliance with a manual water injection steam generator is filled with water up to the water level mark indicated on the steam generator. The State Administration of Technical Supervision approved the implementation on November 06, 1996 and implemented on November 01, 1997
GB4706.34--1996||tt| |Appliances with automatic water-filling steam generators are connected to a water source that conforms to the water supply pressure indicated by the manufacturer for correct operation. Adjust the water pressure to the pressure that produces the most unfavorable conditions within the pressure range specified by the manufacturer. The inlet water temperature is maintained at
·15℃±5℃, if the appliance is connected to a cold water source; ·60℃±5℃, if the appliance is only connected to a hot water source, or the temperature indicated in the instruction manual, whichever is chosen. Larger value. If the appliance can be connected to both hot and cold water sources, keep the water at a temperature that produces the most unfavorable results. All hoods, doors and covers are in their normal position and closed. The water load in the steaming compartment of the appliance shall be at an initial temperature of 15°C ± 5°C, and the load shall be based on the maximum food load of 0.5L/kg indicated by the manufacturer. The water load is evenly distributed between the racks and between the plates, and since the plates can be perforated to allow steam to circulate, the water load can be distributed evenly between the racks or between the plates in suitable containers. 2.2.30 This article is replaced by the following:
Normal load means that when the appliance is working under sufficient heat dissipation conditions, the motor installed in the appliance is used in the required manner according to the manufacturer's instructions. The loads obtained when working under the worst possible conditions. This chapter adds the following clauses:
2.2.101 Steamer refers to an appliance that uses direct contact with steam to steam food. 2.2.102 A large steamer refers to an appliance in which the steam in the steaming compartment is directly discharged into the atmosphere. 2.2.103 Rated pressure refers to the maximum working pressure of the pressure-bearing parts of the appliance specified by the manufacturer. 2.2.104 Steam generator means a component of an appliance specially designed to generate steam for use in a steaming compartment. The steam generator can be installed in the steaming compartment, or remotely located from the steaming compartment but in the same housing, or as a separate component to provide steam to one or several steaming compartments.
2.2.105 Steaming compartment refers to the part of the appliance where steaming or heat processing of food is carried out. 2.2.106 Liquid level mark refers to the highest liquid level mark marked on the steam generator for correct operation. 3 General requirements
The contents of this chapter in GB4706.1-92 are applicable. 4 General instructions for testing
This chapter in GB4706.1-92 is applicable except for the following contents. The following clauses are added to this chapter:
4.101 For combined appliances, if the voltage required to increase the input power of the heating part to 1.15 times the rated input power exceeds the voltage required to increase the motor voltage to 1.06 times the rated voltage by more than 3V, the motor should use a separate power supply. 4.102 Appliances assembled with other appliances or equipped with other appliances should be tested in accordance with the requirements of this standard. Other appliances work simultaneously in accordance with the requirements of relevant standards.
4.103 For appliances using energy other than electricity, the effects of non-electrical components of the appliance must be considered when testing their electrical components. 5 Ratings
The contents of this chapter in GB4706.1-92 are applicable. 6 Classification
The contents of this chapter in GB4706.1-92 are applicable except for the following contents. 6.1 The following contents are added to this clause:
The following contents are added to item 2:
-Jet-proof appliances (IPX5 in accordance with IEC Publication 529: Classification of degrees of protection provided by enclosures). The following contents are added to this clause:
GB4706.34—1996
(3) Classification according to the degree of protection against temperature rise caused by installation conditions: Appliances installed in isolation;
Apparatus installed in a unit with other appliances. At present, there are no additional requirements for appliances installed in a unit with other appliances. 7 Marking
This chapter in GB4706.1-92 is applicable except for the following contents. 7.1This clause adds the following contents:
The following markings shall also be placed on the appliance:
Rated pressure (kPa) on the pressure-bearing parts of the appliance; appliances with automatic water-filling steam generators shall be marked with the water pressure or pressure range required for correct operation in kPa, unless already indicated in the instructions.
7.6This clause adds the following contents:
Add the following two items to the symbol table:
kPa .....
IPX5
7.12This clause adds the following contents:
Kilopascals.
Spray-proof structure.
The appliance shall be accompanied by instructions, which shall specify in detail the matters that must be paid special attention to during installation. Instructions for operation and user maintenance, such as cleaning, shall also be provided.
For appliances permanently connected to fixed wiring, the instructions shall provide information on the protective measures taken against leakage current during installation. If the appliance is not of a spray-proof structure, a clear and detailed instruction manual shall be provided to the user together with the appliance. The instructions shall state that the appliance shall not be cleaned with a water jet.
The instructions shall also indicate the maximum food load expressed in kg. The following clauses are added to this chapter:
7.101 Steam generators with artificial water injection shall be marked with water level marks. 8 Protection against electric shock
The contents of this chapter in GB4706.1-92 are applicable. 9 Starting of electric appliances
The contents of this chapter in GB4706.1-92 are applicable. 10 Input power and current
This chapter in GB4706.1-92 is applicable except for the following contents. 10.1 The following contents are added to this clause:
The total input power of multiple units can be determined by measuring the input power of each unit separately. The rated power input is the sum of the rated power inputs of all individual components of the appliance that can be operated simultaneously; when there are several such combinations, the rated power input is determined by the combination that provides the maximum power input. 11 Heating
This chapter in GB4706.1-92 is applicable except for the following content. 11.2 This clause adds the following content:
GB4706.341996
—Appliances fixed to the floor are installed in accordance with the manufacturer's instructions. If no instructions are provided, GB4706.1-92 applies. A separate steam compartment and steam generator are assembled in accordance with the manufacturer's instructions and placed in the test corner in such a way that they have the most adverse effect on each other and the environment.
11.4 This clause is replaced by the following content:
The appliance is operated under full heat release conditions so that the total power input of the appliance is 1.15 times the rated power input. If it is not possible to switch on all the heating elements simultaneously, each combination is tested under the conditions permitted by the switch configuration, with the highest possible load circuit for each switch configuration being switched on.
If the appliance is provided with controls that limit the total power input, the test is carried out with the combination of heating elements that can be selected by the controls to apply the most severe conditions.
11.7 This clause is replaced by the following:
The appliance is operated as follows:
The steamer with a steam generator installed in the steaming compartment is operated in a continuous operating cycle until a steady state is reached. Each operating cycle consists of an operating period followed by a rest period which should be sufficient, but in no case more than 5 minutes, to replenish the water load, manually fill the water level in the steam generator and, if necessary, restore it to the water mark in accordance with the manufacturer's instructions. The operating time is equal to the maximum steaming time indicated by the manufacturer or, if not provided by the manufacturer, the time taken for the appliance to reach the highest temperature state.
The steamer with a separate steam generator is switched on and operated until the generator reaches a steady state. When a steady state is reached, start the appliance to operate as described above.
11.8 Add the following content to this clause:
During the test, the pressure relief device should not operate. 11.10 Make the following modifications to this clause:
Replace Note ① in the table with the following content:
P=8000
12 Appliances with heating elements operating under overload This chapter in GB4706.192 is applicable except for the following content. 12.3 Add the following content to this clause:
If the pressure can be changed by the user, this test is only carried out on the pressure-bearing parts of the appliance. 13 Electrical insulation and leakage current at operating temperature This chapter in GB4706.192 is applicable except for the following content. 13.2 The following changes are made to this clause:
Replace the specified values ??of leakage current for fixed Class I appliances with the following: ·Appliances connected by flexible cords and plugs…
·Other appliances
The following additions are made to this clause:
1mA/kW maximum limit 10mA.
..1mA/kW no maximum limit.
When the appliance is equipped with Class I or Class III structural components, the leakage current of these components shall not exceed the values ??given in GB4706.1-92. 14 Suppression of radio and television interference
The contents of this chapter in GB4706.1-92 are applicable. 15 Waterproofing
This chapter in GB4706.1-92 is applicable except for the following contents. 15.2 The following content is added to this clause:
GB4706.34-1996
Ordinary and drip-proof appliances shall also be subjected to the splash test using the device shown in Figure 10 of GB4706.1-92. Spray-proof appliances shall be subjected to the test described in IEC Publication No. 529 (IPX5). 15.3 The following content is modified in this clause: bZxz.net
Replace the requirement with the following content:
The construction of the appliance shall ensure that the overflow of liquid does not affect its electrical insulation during normal use. Replace the paragraph on the liquid container test instructions with the following content: The water container of the manually filled steam generator is completely filled with water, and then water equal to 15% of the container capacity is evenly poured into the container within 1 minute.
The appliance with an automatic water filling steam generator is connected to a water source that meets the maximum water supply pressure indicated by the manufacturer for correct operation. The device for controlling water inlet shall remain fully open, and water shall continue to be injected for 1 minute after the first overflow, or until the protective device is activated and the water inlet stops.
15.4 The following changes are made to this clause:
Replace the specified time with the following content:
The time for the appliance to be placed in the humid chamber (box) is 24 hours. The following content is added to this clause:
If it is not possible to place the entire appliance in the humid chamber (box), the parts with electrical components shall be tested separately. Pay attention to the conditions inside the appliance.
The following clauses are added to this chapter:
15.101 Appliances equipped with water switches for filling or cleaning shall be designed so that water flowing out of the switch cannot contact live parts. Compliance is checked by the following test: Connect the appliance to a water source conforming to the maximum supply pressure indicated by the manufacturer. Tiltable and removable parts, including covers, are tilted or placed in the most unfavorable positions. The rotatable outlet tube of the water switch is placed in such a position that water flows towards those parts that will produce the most adverse results. All devices for controlling water inflow are opened for 1 minute. After such treatment, the appliance should immediately undergo the medium strength test in Chapter 16. 16 Insulation resistance and electrical strength
This chapter in GB4706.1-92 is applicable except for the following content. 16.2 The content of this article is modified as follows:
Replace the specified value of leakage current of fixed appliances with the following content·Appliances connected with cords and plugs...·
·Other appliances.|| tt||17 Overload Protection
The contents of this chapter in GB4706.1-92 are applicable. 18 Durability
This chapter in GB4706.1-92 is applicable except for the following content. 18.1 The following content is added to this article:
The test is only performed on the electric components of the appliance. 18.2 The content of this article is modified as follows:
Replace the test description paragraph under the table with the following content: ...2mA/kW maximum limit 10mA.
2mA/kW has no maximum limit.
The electric parts of the appliance operate in equal duty cycles for 48 hours under normal load and 0.9 times the rated voltage. The duration of each cycle is limited to 4 hours, unless restricted by the operation of the appliance. 19 Abnormal operation
GB4706.34-1996
This chapter in GB4706.1-92 is applicable except for the following content. 19.1 The content of this article is modified as follows:
Replace the applicable test with the following content. For all appliances, test in accordance with Articles 19.2 and 19.3 if necessary. With the test period specified in Chapter 11 Appliances with temperature and pressure limiting controls are tested in accordance with 19.4. , appliances with electric motors, if necessary, shall be tested in accordance with Articles 19.6 and 19.7 to 19.10. The following content is added to this article:
The continuous deflation of the pressure relief device itself is negligible. 19.2 The content of this article is modified as follows:
Replace the first paragraph with the following:
The appliance does not carry water load and all doors or covers are closed, under the conditions specified in Chapter 11 When working, the power supply voltage determined before the test should make the input power equal to 0.85 times the rated input power when reaching a steady state under sufficient heat dissipation conditions. This voltage should be maintained throughout the test.
The following content is added to this article:
For steam generators, the test of 19.3 shall be carried out in any case. 19.3 The following content is added to this article:
Any adjustable temperature or pressure controller that is preset in the appliance and is not locked for correct operation should be adjusted to the most unfavorable position. 19.4 The following content is added to this article: | |tt||The appliance is tested under the conditions specified in Chapter 11, but at a voltage such that the input power is 1.24 times the rated input power, short-circuiting any controller used to limit the temperature during the tests in Chapter 11. If the appliance is equipped with more than one control unit, these controls shall be short-circuited in sequence. If the applicable IEC standard covers the conditions present in the appliance, a contactor that complies with the relevant standard shall not open or short-circuit. However, locking in the "on" position the main contacts of a contactor used in normal use to turn on and off a heating element shall be considered a fault condition unless the appliance is equipped with at least two sets of contacts connected in series . For example, two contactors that work independently of each other or one contactor with two independent sets of main contacts operated by two independent armatures. 20 Stability and mechanical hazards
This chapter in GB4706.1-92 is applicable except for the following content. 20.1 This article adds the following content:
Covers, covers and accessories are placed in the most unfavorable position. When conducting this test, any spillage of liquid can be ignored. 21 Mechanical Strength
This chapter in GB4706.1-92 is applicable except for the following content. The following clause is added to this chapter:
21.101 The design of the steaming tray should be such that it will not fall from the support whether it is in the box or extends 50% of the depth of the steaming tray. It should not tilt when 50% is extended.
Determine whether it is qualified by the following test
Place evenly distributed weights in a cake box or similar container equivalent to 75% of the area of ??the steaming tray, and the total is based on the area of ??the cake box per square meter 40kg. Insert a steaming tray on the support installed in the box and place the load box in the center. Move the steaming tray to the left as far as possible, stay for 1 minute, and then take it out. Insert the steaming tray again, move it to the right to the end, stay for 1 minute, and then take it out. Afterwards, extend the steam tray by 50% of its depth101 The steaming tray should be designed so that it will not fall from the support whether it is in the box or when it extends 50% of the depth of the steaming tray. It should not tilt when 50% is extended.
Determine whether it is qualified by the following test
Place evenly distributed weights in a cake box or similar container equivalent to 75% of the area of ??the steaming plate, and the total is based on the area of ??the cake box per square meter 40kg. Insert a steaming tray on the support installed in the box and place the load box in the center. Move the steaming tray to the left as far as possible, stay for 1 minute, and then take it out. Insert the steaming tray again, move it to the right to the end, stay for 1 minute, and then take it out. Afterwards, extend the steam tray by 50% of its depth101 The steaming tray should be designed so that it will not fall from the support whether it is in the box or extends 50% of the depth of the steaming tray. It should not tilt when 50% is extended.
Determine whether it is qualified by the following test
Place evenly distributed weights in a cake box or similar container equivalent to 75% of the area of ??the steaming tray, and the total is based on the area of ??the cake box per square meter 40kg. Insert a steaming tray on the support installed in the box and place the load box in the center. Move the steaming tray to the left as far as possible, stay for 1 minute, and then take it out. Insert the steaming tray again, move it to the right to the end, stay for 1 minute, and then take it out. Afterwards, extend the steam tray by 50% of its depth
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