GB 4706.52-2001 Safety of household and similar electrical appliances - Particular requirements for commercial electric cookers, ovens, ranges and cooking units
Some standard content:
GB4706.522001
All technical contents of this standard are mandatory. Former
This standard is equivalent to IEC60335-2-36:1993% Safety of household and similar electrical appliances Part 2: Particular requirements for commercial electric cookers, ovens, stoves and cooker units, third edition and its amendment No. 1 (1996). This standard should be used in conjunction with GB4706.1-1998% Safety of household and similar electrical appliances 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 GB4706.1-1998, 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 Equipment Subcommittee of the National Technical Committee for Standardization of Household Electrical Appliances. The drafting unit of this standard: National Food Service Machinery Quality Supervision and Inspection Center. The main drafters of this standard: Zhang Chengbin, Zhang Chunsheng, Xia Xiaoli, Zhan Yulan, Wu Linshu. GB 4706.52-2001
IEC Preface
1) The International Electrotechnical Commission (IEC) is a global standardization organization composed of the Electrotechnical Commissions (TEC National Committees) of its member countries. 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 preparation 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 relations with 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 on technical issues of the IFC, formulated by technical committees participated by all concerned National Committees, 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, the IEC National Committees work together The intention is to apply IEC International Standards to national and regional standards as clearly as possible. Any inconsistency between IFC standards and corresponding national and regional standards shall 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 335 series of standards was 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 60335-2-36 and replaces the second edition and its static amendment No. 1. The text of this part is based on the following documents: DIS
61E(CO)119
Voting Report
61E(CO)121
Details of the voting to approve this standard may 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 (1991) of that standard.
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 cookers, ovens, ranges and cooking units.
If individual clauses of Part 1 are not mentioned in this Part 2, they shall still apply if reasonable. When "addition", "modification" or "replacement" is indicated in this standard, the relevant text in Part 1 shall be modified accordingly. Note: In this standard,
1) The following printing fonts are used:
-Requirement itself: Roman font,
-Test specification, italic;
-Notes: Small Roman font.
The boldface words in the text are defined in Chapter 2. 2) The clauses, notes and diagrams added to IEC335-1 shall be numbered from 101. 1 Scope
National Standard of the People's Republic of China
Safety of household and similar electrical appliances
Particular requirements for commercial electric cooking ranges, ovens, hobs and hob elements GB4706.1--1998 This chapter is replaced by the following: GB 4706. 52--2001
idt LEC 60335-2-36:1993
This standard deals with the safety of commercial electric cookers, ovens, ranges, cooker units and similar appliances not intended for domestic use. For single-phase appliances connected to a line and neutral conductor, the rated voltage does not exceed 250 V. For other appliances, it does not exceed 480 V. NOTE 1: Such appliances are used, for example, in the kitchens of restaurants, food shops, hospitals and in commercial enterprises such as bakeries and butchers. The electrical parts of appliances utilising other forms of energy are also within the scope of this standard. To the extent practicable, this standard deals with the common hazards arising from 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, additional requirements may be necessary. Appliances designed for household use may have necessary special requirements: - In many countries, additional requirements prescribed by national health, labor protection, water supply and other similar authorities should also be considered. This standard does not apply to:
- Appliances designed for industrial use: Appliances intended for use in places where special conditions such as the presence of corrosive or explosive atmospheres (dust, steam or flammable gases) frequently occur:
Appliances for continuous operation for mass production of food: - Microwave ovens,
Steam convection heating ovens;
Forced convection heating ovens (IEC60335-2-42); Steamers (GB4706.34);
- Food holding cabinets (IEC60335-2-49). 2 Definitions
GB 4706,11998, except for the following content. 2.2.4 This clause is added with the following content:
Note: The rated input 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 input power is determined by the combination with the largest input power. 2.2.9 This clause is replaced with the following content;
Normal operation normal operation
The appliance works under the following conditions:
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 4706.52—2001
When the integral stove unit is not loaded, the cover stove unit is loaded with a piece of black matte cold-rolled or hot-rolled steel plate with a thickness of 9mm to 10mm. The steel plate covers not less than 90% and not more than 100% of the unit surface. When the cooking unit is in operation, adjust the controls so that the following temperatures are displayed when measured at the geometric center of the whole unit, or the loading steel plate, or at the hottest point when the unit is heated unevenly. The step controller is adjusted to the first position showing a temperature equal to or greater than 275°C. The cycle controller is adjusted so that the average temperature during the entire cycle is 275°C ± 5°C. If this temperature cannot be reached, adjust the controller to the highest setting. - Non-inductive heating source Under glass ceramic or similar material, one or more pans initially filled with cold water are used, and the water is filled to a height of 60 mm ± 10 mm. The pan is made of non-mirror-polished, ordinary quality aluminum, and the concavity of the bottom surface does not exceed 0.1 mm. The pan covers the cooking area to the maximum extent possible. With the lid on the pan, adjust the control to the highest setting until the water boils, and then adjust it to keep boiling. Add water at any time during the boiling process to maintain the water level.
—The induction heating source is located under a glass ceramic or similar material and is used with a pan recommended by the manufacturer. If a pan is used, the bottom of the pan should cover the cooking area as close as possible but not less than the total area of the cooking area, and the pan should be placed in the center. For non-circular cooking areas, use a minimum number of pans to cover as much of the cooking area as possible. In all cases, the pan is filled with cold frying oil.The oil level reaches a height of 30 mm ± 5 mm. Adjust the controller to the highest setting until the oil temperature reaches 180°C, and then adjust it to keep the oil at 180°C ± 15°C. A further test is carried out with cold water, filling the pan with water to a height of 60 mm ± 10 mm. Cover the pan. Adjust the controller to the highest setting until the water boils, and then adjust it to keep boiling. Add water at any time during the boiling process to maintain the water level. The conditions that will cause the most unfavorable results (oil or water) should be adopted. The oven is operated without load, and the controllers are adjusted so that the average temperature at the geometric center of the effective space inside the oven is maintained at 240°C ± 4°C during the entire temperature control cycle. The step controller is adjusted to 240°C ± 15°C. For ovens that can reach temperatures above 290°C, adjust their controllers so that this temperature is 50°C ± 4°C below the maximum value reached by the fat. For ovens that cannot reach 240°C, adjust their controllers to the highest setting.
- The baking tray is operated without load and the controls are adjusted so that the following temperatures are indicated when measured at the hottest point of each controlled cooking surface. The step controller is adjusted to the first position indicating a temperature equal to or greater than 275°C. The cycle controller is adjusted so that the average temperature over the entire cycle is 275°C ± 5°C. If this temperature cannot be achieved, the controller is adjusted to the highest setting. The motor installed in the appliance operates in the intended manner under the most severe conditions that may be expected in normal use and is re-adjusted to the manufacturer's instructions.
The following clause is added to this chapter:
2.2.101 Cooking range
A single cooking appliance incorporating one or more ovens, together with one or more cooking units or baking trays, or a combination of these components. NOTE: Appliances incorporating a forced convection oven, a steam convection oven or a microwave oven are considered appliances incorporating other appliances. (See 4.102) 2.2.102 heating unit any part of an appliance that performs an independent cooking or heating function. &
1 Examples of heating units are cooking units, baking trays or ovens. 2 If an oven is fitted with more than one heating element or group of heating elements, and when one heating element or group of elements is energised, another heating element or group of elements is controlled so as not to be switched on, each heating element or group of elements is considered to be an independent heating element and is subjected to the corresponding test. 2.2.103 hob element (boiling plate, surface element) a heating element on the top of which one or more containers can be placed. NOTE A cooking unit may consist of a source of applied or non-applied heat directly beneath a surface of glass, porcelain or similar material. 2.2.104 cooktop the horizontal part of an appliance to which a cooking unit is attached. 2.2.105 hob
G 4706. 52—2001
cooktop and one or more cooking units. It may be a separate appliance or a component of a hob. Note: A baking tray may also be installed in the hob.
2.2.106 cooking zone
a designated area on a cooktop of glass ceramic or similar material for the placement of containers. 2.2.107 induction heating source a heating source that relies on induction eddy currents in a container placed on the cooking unit. 2.2.108 griddle plate
a hot component that provides for the placement of food directly on the cooking surface. Add the following new definition here:
2.2.1D9 installation wall a dedicated fixed structure that contains supply facilities. Supply facilities apply to appliances installed in conjunction with the structure. 3 General requirements
This chapter of GB4706.1-1998 is applicable except for the following contents. This chapter adds the following contents:
Note 101: The DC component of the neutral line of the appliance is limited. (Australia) 4 General conditions for testing
This chapter of GB4706.1-1998 is applicable except for the following contents. 4.2 This clause adds the following contents:
Separately delivered cooking units shall be installed in a suitable stove for testing. The tests described in 18.2 may be carried out with separate specimens. 4.3 This clause adds the following contents:
Unless carried out with separate specimens, the tests in 18.2 shall be completed before the tests in Chapter 11. 4.10 The following content is added to this clause:
Appliances intended to be installed in a group of other appliances or to be fixed to a mounting wall shall be enclosed so as 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 enclosures or additional appliances may be required for testing. The following clause is added to this chapter:
4.101 Appliances are tested as electric heating equipment even if they are equipped with motors. 4.102 Appliances assembled with other appliances or equipped with other appliances shall be tested in accordance with the requirements of this standard. Other appliances shall operate simultaneously in accordance with the requirements of relevant standards.
5 Blank chapter
6 Classification
This chapter in GB4706.1-1998 is applicable except for the following content. 6.1 This clause is replaced by the following content:
With regard to the category of protection against electric shock, the appliance shall belong to Class I. Compliance is determined by inspection and relevant tests. Note: If the rated voltage of the appliance does not exceed 150V, it is officially recognized as Class 01. (Japan) 6.2 The following content is added to this clause:
Note [01: Appliances intended to be installed in kitchens are required to have appropriate protection against harmful water ingress, depending on their installation height. (France) The following clause is added to this chapter:
GB 4706. 52—2001
6.101 Depending on the degree of protection against temperature rise caused by the installation conditions, appliances should be classified as follows: - Appliances installed in isolation;
- Appliances installed in a group of other appliances. Note: There are currently 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 content. 7.1 The following content is added to this clause:
In addition, the appliance shall be marked with:
- For appliances intended to be connected to a water source, the water pressure or pressure range shall be expressed in kPa, except where otherwise indicated in the instructions. Appliances equipped with induction heating sources shall be marked with the following content in addition:- Operating frequency or operating frequency range (kHz):- The total input power (W or kW) of all induction heating components that can be operated simultaneously, except where otherwise indicated in the instructions: Note 101: The input power to be marked or indicated is the maximum input power allowed in any switch configuration,- The total input power (W or kW) of all non-induction heating components that can be operated simultaneously, except where otherwise indicated in the instructions. Note 102: The input power to be marked or stated is the maximum input power allowed in any switch configuration. All covers that provide contact protection for live parts with an operating voltage greater than 250V should be marked as follows: "Warning: Dangerous voltage 1" or the symbol of dangerous voltage. (See 7.6) Covers that provide contact protection for inductive coils should be marked as follows: "Caution magnetic field! " or the symbol of non-ionizing electromagnetic radiation. (See 7.6) Note 103: If these warnings cannot be marked on the enclosure, alternative warnings can be placed close to the enclosure fixing bolts. 7.6 This clause adds the following content:
Add the following symbols:
.... Non-ionizing electromagnetic radiation (IEC60417-5140)...- Dangerous voltage (IEC60417-5036-=)) Equipotential (IEC60417-5021-a)
7.12 The following is added to this article:
If the appliance is equipped with a cooktop of glass ceramic or similar material forming an enclosure for live parts, the instructions should include the following warning points: Warning: If the cooktop cracks, immediately disconnect the appliance or the relevant parts from the power supply! For appliances with cooktops of glass ceramic or similar material, the instructions should specify that aluminum foil or plastic containers should not be placed on the high humidity surface, and should also specify that objects should not be stacked on the surface.
For cooktops equipped with halogen lamps, the instructions should warn the user in advance to avoid looking directly at the lit lamp. For appliances equipped with induction heating sources, the instructions should indicate the minimum size of cooking containers to be used, and should also include the following points: - Metal objects such as kitchen utensils, knives and forks should not be placed in the cooking zone on the cooktop because they will be heated - Be careful when operating the appliance because rings, watches, etc. hidden by the user will be heated when close to the cooktop. Only use containers of the recommended type and size. For appliances equipped with an induction heating source, unless specific details are given, the instructions should specify that users with pacemakers should consult the manufacturer before operating the appliance.
See IFC60417: Graphical symbols for quick use on equipment, 7.12.1 This clause is replaced by the following:
GB 4706. 52—2001
The appliance should be accompanied by instructions detailing the special precautions necessary for installation. Instructions for user maintenance such as cleaning should also be provided.
The following content is added in batches:
For appliances intended to be installed in a group of other appliances and for appliances fixed to a mounting wall, detailed instructions on how to ensure adequate protection against electric shock and harmful ingress of water should be provided. If the control panels of more than one appliance are combined in a separate space, detailed installation instructions should be provided.
For appliances permanently connected to fixed wiring and for appliances in which the leakage current may exceed 10 mA, especially when disconnected or out of service for long periods, or when first installed, the instructions shall provide information on the ratings of the protective device to be installed, i.e. earth leakage protection relay.
If the appliance is not designed to be spray-proof, clear and detailed instructions shall be provided with the appliance to the user stating that the appliance should not be cleaned with water jets.
In addition, for appliances incorporating an induction heating source, the instructions shall specify that any repair work may only be carried out by personnel trained or recommended by the manufacturer.
Compliance is checked by inspection.
7. 12. 4The following is added to this clause:
For appliances incorporating an induction heating source, if this is necessary for constructional reasons, instructions shall be provided to ensure that the splash guard and surrounding area are free of metal surfaces.
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 installed appliance. Note: A built-in cooker is an example of such an appliance. The following clause is added to this clause:
7.101 If the temperature rise of the side and rear walls above the cooktop exceeds 65°C during the tests of clause 11 and/or the temperature rise of the side walls + or below the cooktop exceeds 125°C during the tests of clause 19, the installation instructions provided by the manufacturer should include the following points, which should also be included in a temporary label attached to the appliance, such as a strapping type. "If the appliance is located in the vicinity of a wall, partition, kitchen equipment, decorative panel, etc., it is recommended that the latter should be made of non-combustible material, otherwise it should be covered with suitable non-combustible thermal insulation material and close attention should be paid to fire prevention regulations." Compliance is determined by inspection.
7.102 Cooking zones on cooktops of glass ceramic or similar material shall be clearly marked by suitable markings unless already obvious. Compliance is checked by inspection.
7.103 Equipotential bonding terminals shall be marked with the equipotential bonding symbol. (See 7.6) These markings shall not be on screws, removable washers or other parts that may be removed when making conductor connections. Compliance is checked by inspection.
B Protection against access to live parts
This clause of GB 4706.1-1998 applies except as follows 8.1 This clause adds the following:
Appliances intended to be fitted with removable cooking units shall be constructed with adequate protection to prevent accidental access to live parts when the cooking units are removed.
This clause adds the following clause
8.101 Heating elements which are liable to be accidentally touched by forks or similar pointed objects in normal use shall be protected so that their live parts cannot come into contact with such objects.
GB 4706. 52—2001
Compliance is checked by inserting the test pin shown in Figure 101 at all points around live parts where it can enter. No appreciable force is applied to the test pin.
9 Starting of motor-operated appliances
9.1 To comply with the requirements of Chapter 11, fan motors used for cooling should be able to start under all voltage conditions that may 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 beginning of the test. Each start should be carried out under the condition that the motor is ready to start normal operation. For automatic appliances, it should be carried out under the condition that the normal working cycle begins. Between two consecutive starts, the motor can come to a standstill. When the motor is not equipped with a centrifugal starting switch, the above test should be repeated at 1.06 times the rated voltage. In all the above cases, the motor should be able to start and should operate in a manner that does not affect safety. Its overload protection device should not operate. Note: During the test, the power supply voltage drop should not exceed 1%. 10 Input power and current
This chapter in GB4706.1-1998 is applicable except for the following. 10.1This clause is amended as follows!
Replace the requirements of the first paragraph with the following: At rated voltage and normal operating temperature, the input power of an appliance without an induction heating source shall not deviate from the rated input power by more than the deviation value shown in Table 1.
At rated voltage and normal operating temperature, the input power of an appliance with only an induction heating source shall not deviate from the rated input power by more than 10%.
The measurement is made before the controller setting is adjusted down. For appliances equipped with induction and non-induction heating sources, the following applies: The input power of the induction heating source and non-induction heating source shall be measured separately. Each measurement shall be made so that the heating components that can be energized at the same time work together to obtain the maximum input power. For induction heating sources, the measurement is made before the controller setting is adjusted down. The power input of the induction heating source thus measured shall not deviate from the power input indicated or specified by the manufacturer (see 7.1) by more than 10%; and the power input of the non-induction heating source shall not deviate from the power input indicated or specified by the manufacturer (see 7.1) by more than 10%; and the power input of the non-induction heating source shall not deviate from the rated power input by more than 10% when the induction heating source and the non-induction heating source are working simultaneously. 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 contents. 11.2 This clause adds the following contents:
Appliances intended to be fixed on the floor and appliances with a mass greater than 40kg and not equipped with wheels, 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. 11.3 This clause adds the following contents:|| tt||Note 101: If the measurement may be excessively affected by an induction heating source (such as a radiated magnetic field), this effect must be taken into account. Thermocouples are generally not recommended because the induction heating source will cause an unexpected temperature rise in the thermocouple. Platinum resistance can be used to measure the temperature rise of the induction heating source, preferably a high resistance platinum resistance with a twisted connection line. The platinum resistance is placed at the hottest point of the group to minimize the influence on the measured temperature.
11.4 This clause is replaced by the following:
GB 4706. 52—2001
Non-inductive heating parts of the appliance are operated under normal operating conditions at 1.15 times the indicated or specified power input. (See 7.1)
If the temperature rise of the motor, transformer or electronic circuit exceeds the limit, the test is repeated with the appliance powered at 1.06 times the rated voltage. Only the temperature rise of the motor, transformer and electronic circuit is measured. The inductive heating parts are operated simultaneously and at 0.94 times the minimum rated voltage and 1.06 times the maximum rated voltage.
If all heating elements or induction heating sources are not switched on simultaneously, each combination is tested under the conditions permitted by the switch configuration. During the test, the circuit should be connected to the highest possible load for each switch configuration. If the appliance is equipped with a control to limit the total input power, any combination of heating elements that can apply the most severe conditions can be selected for the test.
In addition, appliances equipped with induction heating sources are also operated as above, but the smallest pan recommended by the manufacturer is placed in the cooking area in the most difficult position for the induction line diagram to be energized. Note: When other tests refer to Chapter 11, the above additional operating conditions are not used. 11.7 This clause is replaced by the following:
The appliance is operated continuously until a steady state is established. 11.B This clause is added with the following:
For the rear wall and side walls of the test corner, including the part protruding from the front of the appliance, the 65℃ temperature rise limit applies only below the cooktop. If the temperature rise limit is exceeded for the part above the cooking surface, the requirements of 7.101 shall apply. 12 Blank Chapter
13 Leakage current and electrical strength at operating temperature This chapter in GB 4706.1-1998 shall apply except for the following. 13.1 The following changes shall be made to this clause:
Replace the first four paragraphs of the test specification with the following: Compliance shall be determined by the tests of 13.2 and 13.3. The above tests are conducted after the appliance has been operated under the conditions specified in Chapter 11. Operate the appliance until the leakage current reaches a stable value or the time specified in 11.7 is reached, whichever is shorter. If more than one pan is placed on a cooking zone, they shall be electrically connected together. 13.2 The following changes shall be made to this clause:
Replace the permissible value of leakage current for Class I free-standing appliances with the following: Appliances connected by flexible cords and plugs: 1 mA/rW according to the rated input power of the appliance, with a maximum limit of 10 mA. Other appliances: 1mA/kW at rated input power of the appliance, no maximum limit. Note 101: The limit value of leakage current is different. (Japan) The following content is added to this article:
When the appliance is equipped with Class I or Class [ structural parts, the leakage current of these parts shall not exceed the values given in GB4706-1. If there is grounded metal between the live parts and the surface of glass, ceramic or similar materials, the leakage current of each cooking zone shall be measured in turn only when the relevant pan is connected to the grounded metal. The leakage current value shall not be greater than the input power of the heating part under test multiplied by 1mA/kW. Note 102: The input power of the heating part is measured under the conditions of Chapter 10. If there is no grounded metal between the live parts and the surface of glass, ceramic or similar materials, the leakage current shall be measured between each pole of the power supply and the pan of each cooking zone, and the relevant pan shall not be connected to the grounded metal. In addition, the leakage current between each pole of the power supply and a probe with a diameter of 50 mm metal disc shall be measured. The probe is placed at all positions on the stove surface except the cooking area, and the pan remains in its original position. GB 4706-52—2001
The leakage current value measured each time should not exceed 0.25 mA: For stove units with induction heating sources, the leakage current between the live parts and the pans in each cooking zone should be measured in turn, and the measurement voltage is shown in Figure 103. The measured current peak should not be greater than 0.7 mA multiplied by the operating frequency (kHz) or 70 mA, whichever is smaller.
Property 103: It should be noted that it should not be affected by the antenna effect or the like. 13.3 This clause adds the following content
If there is a grounding metal solution between the live parts and the surface of glass ceramic or similar materials, all the pans on the stove surface are electrically connected together and connected to the grounding metal.
Then a test voltage of 1 000 V is applied between the live parts and the pans. If there is no earthed metal between the live parts and the surface of glass ceramic or similar material, all pans on the cooktop are electrically connected together but not to the earthed metal. A test voltage of 3750 V is then applied between the live parts and the pans. For cooker units equipped with an induction heating source with an operating voltage of more than 250 V, the following test voltages are applied: -1 000 V increased to 1-2×U+700 V -2750 V increased to 1.2×U+2450 VbZxz.net
3750 V increased to 2.4×U+3150 V
Where U is the operating voltage.
Note 101: It is important to ensure that the voltage applied does not overload other insulation. 14 Blank chapter
15 Moisture resistance
This chapter in GB4706.1-1998 is applicable except for the above contents. 15.1.1 This clause is amended as follows:
In addition, IPX0, IPX1, IPX2, IPX3 and IPX4 appliances shall be subjected to the following splash water test for 5 min. The apparatus shown in Figure 102 shall be used. During the test, the water pressure shall be adjusted so that the water splashes 150 mm from the bottom of the bowl. For appliances normally used on the ground, the bowl is placed on the ground, while for all other appliances, the bowl is placed on a horizontal support surface 50 mm below the lowest edge of the appliance and then moved around the appliance so that water hits the appliance from all directions. Care should be taken that the water does not spray directly onto the appliance. 15.1.2 The following amendments shall be made to this clause:
Appliances normally used on a table shall be placed on a support surface the dimensions of which are 15 cm ± 5 cm larger on each side than the orthographic projection of the appliance on the support surface.
The following addition shall be made:
If the instructions include detailed instructions for cleaning of removable but non-detachable (e.g. chain-connected) cooking units, the tests of such cooking units shall be carried out in the horizontal position for normal use. 15.2 This clause shall be replaced by the following:
Appliances shall be constructed so that in normal use the presence of the body will not affect their electrical insulation. Compliance is checked by the following test. Appliances with X-type connections, except those equipped with specially prepared flexible cords, shall be equipped with the lightest permitted flexible cord or a flexible cord of the minimum cross-sectional area specified in 26.2. Other appliances shall be tested as delivered. Remove removable parts.
Position the appliance so that the cooking surface is level. If the cooking units can be adjusted separately, also make their surfaces level. Fill a container with a diameter equal to or less than 25 mm and smaller than the largest inner circle of the cooking unit or cooking zone with cold salt water and place it in an unfavorable position, not touching the boundary line of the cooking unit or cooking zone. Also, pour approximately 2L of salt water evenly into the container over 1 minute. GB 4706. 52—2001
Note 1: Each cooking unit is tested separately, and the tray or other storage container is emptied for each test. For appliances equipped with ovens or grills, when conducting the overflow test, pour approximately 1 L of cold salt water evenly over the bottom surface of the oven or grill chamber over 1 minute.
For appliances equipped with baking trays, pour approximately 1 L of cold salt water evenly over the center of the baking tray surface over 1 minute. If the appliance is fitted with a cooktop control, pour approximately 1 litre of cold salt water over the control over a period of 1 minute. 2: The salt water contains 1% NaCl. a
The appliance is subjected to the electrical strength test of 16.3 immediately after disposal and a visual inspection shall demonstrate that the water which may have entered the appliance does not affect its compliance with this standard. In particular, no traces of water are found on the insulation which defines creepage distances and clearances in 29.1. 15.3 This clause is supplemented with the following:
NOTE 101: If it is not possible to place the entire appliance in a humidity chamber, the parts containing the electrical components are tested separately, but the conditions present in the appliance are reviewed.
Add the following items to this chapter:
15.101 Appliances equipped with water switches for filling or cleaning shall be constructed so that the water flowing from the water switches cannot contact live parts. Compliance shall be determined by the following test
Connect the appliance to a water source with the maximum water supply pressure required for manufacturing, with the water inlet switches fully opened. Tiltable and movable parts, including covers, are tilted or placed in unfavorable positions. Position the rotatable outlet of the water switch so that water flows to those parts that will produce the most unfavorable results. Immediately after the above treatment, the appliance shall 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 contents. 16.1 This clause is supplemented with the following:
For appliances equipped with cooktops made of glass ceramic or similar material, the tests of 16.2 and 16.3 are carried out with one or more pans as described in 2.2.9.
If more than one pan is placed on a cooking zone, they are electrically connected together. 16.2 The following amendments are made to this clause:
Replace the following with the permissible value of leakage current for Class I stationary appliances: For appliances connected to a pair of flexible cords and plugs: 2 mA/kW based on the rated power input of the appliance, with a maximum limit of 10 mA. For other appliances: 2 mA/kW based on the rated power input of the appliance, with no maximum limit. Note 101: The limits for leakage current are different. (Japan) The following additions are made to this clause:
If there is a grounded metal between the live parts and the surface of glass ceramics or similar materials, when measuring the leakage current of each cooking zone in turn, only the relevant pan is connected to the grounded metal, and the leakage current value should not exceed 2 mA/kW based on the input power of the measured hot part. If there is no grounded metal between the live parts and the surface of glass ceramics or similar materials, the leakage current is measured between the live parts and the pan of each cooking zone in turn. The relevant pan is not connected to the grounded metal. In addition, the leakage current is also measured between the live parts and a handle consisting of a metal disc with a diameter of 50 Ⅱm. During the measurement, the probe is placed at all positions on the cooktop outside the cooking zone, and the pans remain in their original positions. The leakage current value measured for each item shall not exceed 0.25 mA. 16.3 This item adds the following content:
If there is grounded metal between the live parts and the surface of glass, ceramic or similar material, all the pans on the cooktop are electrically connected together and connected to the grounded metal.
Then a test voltage of 1250 V is applied between the live parts and the pans. If there is grounded metal chips between the live parts and the surface of glass, ceramic or similar material, all the pans on the cooktop are electrically connected together, but not connected to the grounded metal. GB 4706-52—2001
Then a test voltage of 3750 V is applied between the live parts and the pan. For cooking units equipped with an induction heating source with an operating voltage of more than 250 V, the following test voltages are applied: -1250 V increased to 1.2XU+950 V
2500 V increased to 1.2XU+2200 V
-— 3750 V increased to 2.4×U+3150 V where U is the operating voltage.
17 Overload protection of transformers and associated circuits The contents of this chapter in GB 4706.1—1998 are applicable. 18 Durability
18.1 Appliances equipped with induction heating sources should be constructed so that, in normal use, no faults that could impair compliance with this standard will occur, the insulation should not be damaged, and the connections should not become loose. Compliance is checked by moving a pan (or an equivalent metal object) of the smallest size recommended by the manufacturer onto and off the cooking unit at a rate of 6 times per minute (5 seconds per movement) for 100 000 cycles. The test is made at the most unfavourable voltage determined in Clause 11. 18.2 Appliances fitted with glass-ceramic or similar surfaces shall withstand the thermal stresses likely to occur in normal use. Compliance is checked by the following test: The appliance is operated with all heating sources beneath the glass-ceramic or similar material energised simultaneously. Non-inductive heating sources are operated with a pan filled with water as required in 2.2.9 but placed in the most unfavourable position on the cooking zone. Inductive heating sources are operated with an empty pan.
The appliance is operated at 1,1 times the rated voltage for 500 cycles, each cycle consisting of 10 min on and 20 min off, with the controls set to their highest setting. The test is conducted whether the thermostat or temperature limiter is operated or not. After the last power-on cycle, immediately remove the pan and conduct a water overflow test on the cooktop. During the test, pour 2+"11 cold water at a temperature of 10℃~15℃ evenly on the surface for 1 minute. After 15 minutes, remove all the remaining water on the surface. After this test, the surface should not crack or break, and the appliance should withstand the test of 16.3. 19 Abnormal operation
This chapter in GB 4706.1-1998 is applicable except for the following content. 19.1 The content of this article is modified as follows:
Replace the first paragraph of the test specification with the following content: All appliances are subjected to the tests of 19.2 and 19.3. In addition, appliances with control means that limit the temperature during the test period of Chapter 11 should be subjected to 19.4 The appliance is subjected to the tests of 19.101 and, if applicable, to the test of 19.5. However, during these tests, the cooking unit with the induction heating source is not energized and appliances equipped only with an induction heating source are not tested.
Appliances equipped with an induction heating source are also subjected to the test of 19.101. Appliances equipped with a PTC heating element are also subjected to the test of 19.6. 19.2 This entry is amended as follows:
- The induction heating source is located under a surface of glass, ceramic or similar material and is operated with an empty pan. The pan is placed in the most unfavorable position for energizing the induction coil, even if it is not within the cooking zone. The supply voltage of the induction heating source is 0.94 times the rated voltage. - A non-induction heating source is located under a surface of glass, ceramic or similar material and is operated with an empty pan or without a pan, whichever is the most favorable.1 The following changes are made to this clause:
The first paragraph of the test specification is replaced by the following: All appliances are subjected to the tests of 19.2 and 19.3. In addition, appliances with control means that limit the temperature during the test period of Chapter 11 shall be subjected to the test of 19.4 and, if applicable, the test of 19.5. However, when these tests are carried out, the cooking unit with the induction heating source is not energized and appliances equipped with only the induction heating source are not tested.
An appliance equipped with an induction heating source shall also be subjected to the test of 19.101. An appliance equipped with a PTC heating element shall also be subjected to the test of 19.6. 19.2 The following changes are made to this clause:
The induction heating source is placed under the surface of glass, porcelain or similar material, using an empty pan. The pan is placed in the most unfavorable position for energizing the induction coil, even if it is not within the cooking area. The supply voltage of the induction heat source is 0.94 times the rated voltage. A non-induction heating source is under the surface of glass, ceramic or similar material, and is operated with an empty pan or without a pan, whichever is the best.1 The following changes are made to this clause:
The first paragraph of the test specification is replaced by the following: All appliances are subjected to the tests of 19.2 and 19.3. In addition, appliances with control means that limit the temperature during the test period of Chapter 11 shall be subjected to the test of 19.4 and, if applicable, the test of 19.5. However, when these tests are carried out, the cooking unit with the induction heating source is not energized and appliances equipped with only the induction heating source are not tested.
An appliance equipped with an induction heating source shall also be subjected to the test of 19.101. An appliance equipped with a PTC heating element shall also be subjected to the test of 19.6. 19.2 The following changes are made to this clause:
The induction heating source is placed under the surface of glass, porcelain or similar material, using an empty pan. The pan is placed in the most unfavorable position for energizing the induction coil, even if it is not within the cooking area. The supply voltage of the induction heat source is 0.94 times the rated voltage. A non-induction heating source is under the surface of glass, ceramic or similar material, and is operated with an empty pan or without a pan, whichever is the best.
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