GB/T 4942.2-1993 Protection grade of low voltage electrical enclosure
Some standard content:
National Standard of the People's Republic of China
Degrees of protection provided by enclosures for low-voltage apparatus
Degrees of protection provided by enclosures for low-voltage apparatusGB/T4942.2-93
Replaces GB 4942. 2--85
This standard is equivalent to the international standard IEC947-1 (1988) "General rules for low-voltage switchgear and control equipment", and refers to the provisions and requirements of the enclosure protection degree of low-voltage electrical appliances in standards such as IEC529 (1989) "Enclosure protection degree". 1 Subject content and scope of application
This standard specifies the classification, grading, marking, definition, test methods and conformity assessment of the enclosure protection degree of low-voltage electrical appliances (hereinafter referred to as electrical appliances).
This standard applies to the protection grading of electrical appliance enclosures. This standard does not apply to the protection of electrical appliances against mechanical damage, explosive, corrosive gases or condensation (such as caused by condensation), mold, insect pests, etc.
This standard does not apply to stress effects generated during short-circuit operation. 2 Reference standards
GB2900.18 Electrical terminology Low-voltage electrical appliances
GB14048.1 General provisions for low-voltage switchgear and control equipment 3 Terms, symbols, and codes
3.1 Terms
3.1.1 Enclosure
Parts that can provide a specified degree of protection to prevent certain external influences and to prevent approaching and touching live parts and moving parts.
Note: For the outline fence, hole shape and other facilities set up to prevent external solid foreign objects from entering and touching live parts or moving parts, whether attached to the enclosure or part of the enclosed equipment, they are considered to be part of the enclosure (except for those parts that can be removed without a key or tool). 3.1.2 Degree of protection The degree of protection of the enclosure to prevent external solid foreign objects from entering the enclosure and touching live parts or moving parts, and to prevent water from entering the enclosure, according to the inspection requirements specified in the standard.
3.1.3IP symbol. IP code
The symbol for the degree of protection, consisting of the letter "IP" and two additional digits and supplementary letters. 3.1.4Sufficient clearance adequateclearance refers to the distance at which the test equipment (test ball, test finger, metal wire rod or probe, etc.) should not touch the live parts or moving parts of the appliance (except non-dangerous moving parts such as smooth shafts and similar parts). 3.1.5 Prevent excluded
Indicates that a part of the human body, hand-held tools, metal wire rods or probes can be prevented from entering the housing. Even if they enter, they can maintain a sufficient distance from the live parts or dangerous moving parts (except non-dangerous moving parts such as smooth shafts and similar parts). Approved by the State Administration of Technical Supervision on April 20, 1993 and implemented on December 1, 1993
3.1.6 Hazardous part hazardous part
Parts that are dangerous to approach or touch.
GB/T 4942.293
3.1.7 Hazardous live part Conductor or conductive part that may cause electric shock. 3.1.8 Hazardous mechanical part Moving part that may cause danger to contact, except for smooth rotating shafts. 3.1.9 Direct contact
Contact between human beings or domestic animals and live parts.
Note: (D) "Live parts" refers to dangerous live parts. ② "Contact" refers to not approaching high-voltage live parts with less than an appropriate electrical clearance. 3.1.10 Protection provided by an enclosure against direct contact Protection provided by an enclosure against direct contact Protection against direct contact of dangerous live parts in an enclosure. Note: Protection is provided by the enclosure itself or by a fence that is part of the enclosure, or by the distance from the enclosure. 3.1.11 Adequate clearance for protection against direct contact The distance to prevent direct contact between the test apparatus and the dangerous parts. 3.1.12 Access probe The traditional way of using a simulated human body part or a tool or test probe held by a person to verify the appropriate distance to the dangerous parts. 3.1.13 (Object) Probe object probe is a test probe used to simulate the possibility of solid foreign matter entering the shell. 3.1.14 Hole (opening) opening
A gap or crack that exists in the shell itself or can be formed by the test probe after applying a specified force. 3.1.15 In addition to the provisions of 3.1 to 3.1.14, this standard also quotes the terms and definitions related to this standard in GB/T2900.18 "Electrical Terminology Low Voltage Electrical Appliances".
3.2 Symbols and codes
IP: Characteristic letters representing the protection level symbol. W: Supplementary letters used under specific climatic conditions. N: Supplementary letters used under specific dust environment conditions. L: Supplementary letters used under specified solid foreign matter conditions. 4 Protection types and requirements
4.1 This standard specifies that the electrical enclosure has the following two types 4.1.1 Prevent human body from touching or approaching the live parts in the shell and touching the moving parts in the shell (except for non-hazardous moving parts such as smooth shafts and similar parts); and prevent solid foreign matter from entering the shell 4.1.2 Prevent water from entering the inside of the electrical enclosure and causing harmful effects. 4.2 This standard only considers enclosures that meet the design requirements in all aspects. Under normal use conditions, the material and process of the enclosure should ensure that its performance meets the protection requirements of this standard. 4.3 Fences and other protective measures set around the enclosure for personal safety only should not be considered as part of the enclosure; enclosure fences (insulating partitions) set up to prevent solid foreign objects from entering the enclosure and touching live parts and moving parts should be considered as part of the enclosure. . 4.4 Sometimes, a drain hole can be set at the bottom of the shell to prevent the accumulation of condensation and (or) water in the shell, but it must meet the basic requirements of the opening, and the diameter of the hole should not be less than 2.5mm. 5 Marking
5.1 The marking should be clear and easy to identify. And it is not easy to erase. 124
GB/T4942.2—93
5.2 The letters and numbers representing the degree of protection should be marked on the nameplate of the appliance. If it is difficult, it can be marked on the shell. Open-type appliances do not need to be marked.
5.3 When the various parts of the appliance have different protection levels, the lowest protection level should be marked first; if other parts need to be marked, they should be marked according to the protection level of the part.
5.4 When the installation method of the appliance affects its protection level, the manufacturer should explain the intended installation method on the nameplate or installation instructions or other relevant documents.
5.5 See Appendix A for the commonly used protection levels described in Tables 1 and 2. 6 Technical requirements
6.1 The code indicating the protection level consists of the characterization letter "IP\ and two characterization numbers and supplementary letters attached thereto. The first characterization number and the supplementary letters after the number indicate the various levels of the first type of protection, and the second characterization number indicates the various levels of the second type of protection.
6.2 The protection level indicated by the first characterization number and the supplementary letters after the number and its meaning. The first characterization number and the supplementary letters after the number indicate that the electrical appliance has protection against the human body and the parts inside the shell, which is divided into 9 levels. As shown in Table 1.
Table 1 Protection level indicated by the first characterization number and the supplementary letters after the number The first characterization number
and the supplementary letters after the number
No protection||t Prevent solid objects larger than 50 mm from entering the shell. Prevent solid objects larger than 12.5 mm from entering the shell. Prevent solid objects larger than 2.5 mm from entering the shell. Protection level No special protection Can prevent a large area of the human body (such as hands) from accidentally or unexpectedly touching the live parts or moving parts inside the shell, but cannot prevent intentional approach to these parts. Prevent solid objects larger than 50 mm from entering the shell. Test method and conditions No test See Table 3 1 Can prevent solid objects larger than 12.5mm solid foreign matter can enter into 2L
in Table 3 and prevent fingers or similar objects not exceeding 80mm in length from touching the live parts or moving parts inside the shell. It can prevent tools, metal wires, etc. with a diameter (or thickness) greater than 2.5mm from entering into the shell. It can prevent solid foreign matter with a diameter greater than 12.5mm from entering into the shell. It can prevent solid foreign matter with a diameter greater than 12.5mm from entering into the shell. It can prevent a probe with a diameter of 2.5mm
from touching the shell. It can prevent solid foreign matter with a diameter greater than 1mm from entering into the shell. It can prevent a probe with a length of not more than 100mm and a diameter of 2.5mm from touching the live parts and moving parts inside the shell. It can prevent solid foreign matter with a diameter (or thickness) greater than 1mm from entering into the shell. mm solid
See 3 in Table 3
See 3L in Table 3
See 4 in Table 3
The first characterizing number
and the supplementary letters after the number
GB/T 4942.293
Continued Table 1
Protection level
Prevent solid foreign objects larger than 12.5
mm from entering and prevent
1mm probe from touching
Can prevent solid foreign objects larger than 12.5 mm in diameter from entering the shell and prevent solid foreign objects with a length not exceeding 100 mm and a diameter of 1 mm The test probe touches the live parts and moving parts in the shell. It cannot completely prevent dust from entering the shell, but the amount of dust entering is not enough to affect the normal operation of the appliance. No dust entering the shell. Note: ① The "Brief Description" column in this table does not stipulate the protection type, but can only be used as an overview. Test method and conditions See 4L in Table 3 See 5 in Table 3 See 6 in Table 3 ② The "Meaning" column in this table explains the details of the objects that can be "prevented" from entering the shell by the protection level represented by the first characterizing number and the supplementary letters after the number. ③ Appliances with the first characterizing number in this table from 1 to 4 (2L, 3L, 4L). The solid foreign objects that can be prevented include objects with regular or irregular shapes, and their three mutually perpendicular dimensions all exceed the corresponding values specified in the "Meaning" column. ③ The exterior of electrical appliances with drain holes, ventilation holes, etc. must comply with the requirements of the protection level "IP\ number to which the appliance belongs. During the test, the holes scheduled to be opened or closed at the installation site should be kept open or closed according to the original scheduled requirements. In Table 1, the corresponding protection levels of the first characterizing number and the letters after the number are arranged from low to high as 0, 1, 2L, 3L, 4L, 3, 4, 5, 6. Any enclosure that meets a certain protection level means that it also meets all levels below the protection level. Unless there is doubt, there is no need to test the lower protection level.
6.3 Protection level and meaning of the second characterizing number The second characterizing number indicates the protection against harmful effects caused by water entering the enclosure, which is divided into 9 levels, as shown in Table 2. Table 2 Protection level indicated by the second characterizing number Second characterizing number
Characterizing number
No protection
15\Drip-proof
Water-proof||tt| |Water splash proof
Water spray proof
Sea wave proof
Protection level
No special protection
Vertical dripping water shall have no harmful effect
When the appliance is tilted from the normal position to any angle within 15° in any direction, vertical dripping water shall have no harmful effect. Water spraying within 60° of the vertical line shall have no harmful effect. Water from any direction shall have no harmful effect. Water sprayed from the nozzle in any direction shall have no harmful effect. When subjected to violent waves or strong water spray, the amount of water entering the appliance should not reach a harmful effect
Test method
and conditions
No test
See 1 in Table 4
See 2 in Table 4
See 3 in Table 4
See 4 in 4
See 5 in Table 4
See 6 in Table 4
Second digit
Characteristic number
GB/T 4942.2-93
Continued Table 2
Protection level
Avoidance against flooding
Avoidance against diving
When the appliance is immersed in water at a specified pressure for a specified period of time, the amount of water entering the appliance should not reach a harmful effect. When the appliance is submerged for a long time under a specified pressure, water should not enter the appliance
Note: ① The "Brief Description" column in this table is not used as a regulation of the protection type, but can only be used as a summary. ② The "Meaning" column in this table explains the details of the protection type of each protective outer layer represented by the second characterizing number. Test method
·and conditions
See 7 in Table 4
See 8 in Table 4| |tt||In Table 2, an enclosure that meets a certain protection level means that it also meets all levels below that protection level. Unless there is doubt, it is not necessary to test the lower protection level.
6.4 Use of supplementary letters: When the content of protection is increased, supplementary letters can be used to indicate it.
W: Enclosure protection level with additional protection measures or method requirements (placed after the letter IP) that can be used under specific climatic conditions. N: Enclosure protection level with additional protection measures or method requirements (placed after the second characterizing number) that can be used under specific dust environment conditions (for example: used under harsh dust environment conditions such as sawmills and stone exploration sites). L: Enclosure protection level with additional protection measures or method requirements (placed after the first characterizing number 2, 3 or 4) that can prevent solid foreign objects or test probes from touching the live parts and moving parts in the shell under specified conditions. The specified climate, dust environment, solid foreign objects, test probe conditions and additional protection measures or method requirements are determined by the manufacturer and the user through negotiation. www.bzxz.net
6.5 When only one characterizing digit is needed to indicate a certain protection level, the omitted digit shall be replaced by the letter "x", such as IP1X, IP2LX, IP4X, IP5X, etc. as shown in the Characterization Compliance column in Tables 1 and 2. 6.6 If two characterizing digits (or additional letters) are needed to indicate the complete enclosure protection level of the product, it must be inspected according to the corresponding test requirements Table 3 or Table 4 of the corresponding characterizing digits (or additional letters) in Tables 1 and 2. If there are no additional letters W, N, or L, it means that this protection level is applicable under all normal use conditions. 6.7 Code example:
Second characterizing digit (see Table 2)
First characterizing digit (see Table 1)
Characterizing letter
This code means that dust can be prevented from entering the interior of the electrical enclosure and it can prevent water spray. 127
GB/T 4942.2-93
Second character number (see Table 2)
First character number and supplementary letters after the number (see Table 1)Characteristic letters
This code means that it can prevent solid foreign objects with a diameter greater than 12.5mm from entering the shell and prevent a test probe with a length of no more than 100mm and a diameter of 1mm from touching the live parts and moving parts in the shell, and can prevent splashing water. IP
Second character number (see Table 2)
First character number (see Table 1)
Supplementary letters
Characteristic letters||tt ||This code means that it is used under specific climatic conditions. Its shell can prevent solid foreign objects larger than 2.5mm from entering the interior of the electrical shell and can prevent water from splashing.
7 Test requirements
7.1 The tests specified in this standard are type tests, which are allowed only when new products are finalized or the structure is changed, which affects the protection performance. 7.2 The standard environmental conditions for waterproof and dustproof tests are as follows: temperature: 15~35℃, relative humidity: 45%~75%; pressure: 86~106kPa (860~1060 mbar). 7.3 Unless otherwise specified, the test sample for each test shall be a clean new product, and all parts shall be assembled on a complete product under the normal use and installation conditions specified by the manufacturer. However, temporary coatings (such as anti-rust grease, paint, etc.) on the joints of the shell shall be removed before testing. 7.4 In general, the test is carried out when the appliance is not powered on. If it is necessary to test with power on, it shall be specified in the corresponding product standards or technical conditions, and sufficient safety measures shall be taken. 7.5 For the protection levels with the first characterizing digit being 1 and 2L and the second characterizing digit being 1, 2, 3 and 4, if the visual inspection shows that the expected protection level requirements are met, no further testing is required, but if there is any doubt, the test may be carried out in accordance with the provisions of Chapters 6, 7 and 8. 7.6 If there are additional requirements, they shall be specified in the relevant product standards or technical conditions. 7.7 For the test required by the second characterizing digit condition, the test shall be carried out with clean water. During the test, the moisture in the shell may partially condense, and it shall be avoided to mistake the condensed dew for water ingress. 7.8 When the test time is determined according to the surface area of the appliance, the error in calculating the surface area is ±10%. 128
8 Test methods and conformity assessment
8.1 Test of the first characterizing number
GB/T 4942.2--93
The test methods and conformity assessment of the first characterizing number and the supplementary letters after the number are as specified in Table 3. Table 3 Test methods and conformity assessment of the first characterizing number and the supplementary letters after the number First characterizing number
and the supplementary letters after the number
Test methods and conformity assessment
No test required
Use a rigid test ball with a diameter of 50+0.05mm to apply a force of 50±5N to each opening part of the housing for testing. If the test ball fails to pass through any opening and maintains sufficient clearance with the live parts or rotating parts in the appliance during operation, the test is considered to be qualified.
This test includes the test finger test and the test ball test: 8. Test finger test:
Use the metal test finger shown in Figure 1 for the test: The two connection points of the test finger can be bent 90° in the same direction around its axis. Push the test finger to the opening parts of the shell with a force not greater than 10 N. If it can enter the shell, it should be noted that it can move to all possible positions. If the test finger maintains sufficient clearance with the live parts or rotating parts in the light, the test is considered to be qualified. However, the test finger is allowed to contact with non-hazardous smooth shafts and similar parts. During the test, if possible, the rotating parts in the shell should be rotated slowly. When testing the appliance, an appropriate indicator light can be connected between the test finger and the live parts in the shell, and a safety voltage of 40 to 50 V is provided. For conductive parts that are only coated with varnish, oxides and similar methods, metal foil should be covered and the metal foil should be connected to the live parts during operation. If the indicator light does not light up during the test, the test is considered to be qualified. b. Test ball test:
Use a test ball with a diameter of 12.5+g*mm to apply a force of 30±3N to each opening part of the shell for testing. If the test ball fails to pass through any opening part and maintains sufficient clearance with the live parts or rotating parts in the appliance, the test is considered to be qualified.
Prevent solid foreign matter from entering the appliance shell
Use a straight hard steel wire or rod with a diameter of 2.5+90mm to apply a force of 3±0.3N for testing. The end face of the steel wire or rod should be free of burrs and at right angles to its length.
If the steel wire or rod cannot enter the shell, the test is considered to be qualified. Prevent contact with live parts or moving parts Use a straight hard steel wire or rod with a diameter of 2.5+g.0smm and a length of 100mm to apply a force of 3±0.3N for testing. The end face of the steel wire or rod should be processed into a round shape.
If the wire or rod maintains sufficient clearance from the live parts or rotating parts in the appliance, the test is considered to be qualified. In addition, the test ball test with the first characterizing number 2 L should also meet the requirements for preventing solid foreign matter from entering the appliance housing:
Use a straight hard steel wire or rod with a diameter of 1+g.05mm and apply a force of 1±0.1 N for the test. The end face of the steel wire or rod should be free of burrs and at right angles to its length.
If the steel wire or rod cannot enter the housing, the test is considered to be qualified 129
The first characterizing number
and the additional letters after the number
GB/T4942.2—93
Continued Table 3
Test method and conformity assessment
Prevent contact with live parts or moving parts: Use a straight hard steel wire or rod with a diameter of 1+°mm and a length of 100mm and apply a force of 1±0.1N for the test. The end face of the steel wire or rod should be processed into a round shape.
If the steel wire or rod maintains sufficient clearance with the live parts or rotating parts in the electrical enclosure, the test is considered qualified. In addition, the test ball test with the first characterizing number 2L should also meet a. Dustproof test
The test is carried out using the equipment shown in Figure 2 as the basic principle. In a properly sealed test box, talcum powder in a suspended state is contained. The talcum powder should be able to pass through a metal square hole sieve with a sieve size of 75μm and a sieve wire diameter of 50μm. The amount of talcum powder is 2kg per cubic meter of test box volume, and the number of uses should not exceed 20 times. The outer shell can be divided into two types according to the pressure difference between the inside and outside of the shell. The relevant product standards should specify which type the outer shell of the electrical appliance belongs to.
The first type: When the electrical appliance is in a normal working cycle, the air pressure inside the shell is lower than the air pressure outside the shell due to thermal effects. The second type: When the electrical appliance is working normally, the pressure inside and outside the shell is the same. For the first type of electrical enclosure, during the test, the electrical appliance is supported in the test box, and the vacuum pump is used to evacuate the air so that the air pressure in the electrical enclosure is lower than the ambient pressure. If the enclosure has only one wire hole (cable entry hole), the exhaust pipe should be connected to this hole and no other holes should be opened. If there are several wire holes (cable entry holes), the other holes should be closed during the test. This type of enclosure is not allowed to have drain holes and other openings.
The test is to use an appropriate pressure difference to draw the air in the box into the electrical enclosure. If possible, the exhaust volume should be at least 80 times the volume of air in the enclosure, and the exhaust speed should not exceed 60 times the volume of air in the enclosure per hour. In any case, the pressure difference on the pressure gauge should not exceed 1.96kPa (200mmHz0). As shown in Figure 2 pressure gauge. If the exhaust speed reaches 40 to 60 times the volume of air in the enclosure per hour, the test will be carried out for 2 hours. If the exhaust speed is less than 40 times the volume of air in the enclosure per hour and the pressure difference has reached 1.96kPa, the test should continue until 80 times the volume of air in the enclosure is exhausted or the test is completed for 8 hours.
For the second type of electrical enclosure, during the test, the appliance is placed in the test chamber in the normal working position, but is not connected to the vacuum pump. Under normal circumstances, the open holes remain open during the test, and the test continues for 8 hours. If the entire appliance cannot be placed in the test chamber for testing, the independent closed parts of the appliance enclosure can be tested separately.
If there are other specific provisions, they can be further explained in the product standard. For the above two types, if there is no large accumulation of talcum powder after the test and the deposition location is not enough to affect the normal operation of the appliance like other dusts (such as non-conductive, non-flammable, non-explosive or non-chemically corrosive dusts), the test is considered to be qualified. If necessary, the manufacturer may specify the use of other properties and types of dust sizes for testing according to the special environmental conditions of use, but this situation must be included in the test report and indicated by the supplementary letter "N". b. Steel wire test:
If the appliance has a drain hole (the hole should not be less than 2.5mm), a straight hard steel wire with a diameter of 1+gmm and a length of 100mm must be used or a force of 1±0.1N must be applied to the drain hole for testing. The end face of the steel wire or rod should be processed into a round shape. If the steel wire or rod maintains a sufficient gap with the live parts or rotating parts in the appliance housing, the test is considered to be qualified. The test conditions are tested according to the method of level 5a in this table. If there is no visible dust in the appliance housing after the test, the test is considered to be qualified. 8.2 Test of the second characterizing number
GB/T 4942.2—93
8.2.1 The test method and conditions for the second characterizing number are specified in Table 4. Table 4 Test method and conditions for the second characterizing number Second characterizing number
Test method and conditions
No test required
The test is carried out with a dripping device, and its principle is shown in Figure 3. The dripping water shall be evenly distributed over the whole area of the equipment and shall produce a rainfall of 3 to 5 mm per minute (if the equipment equivalent to Figure 3 is used, the water level shall drop by 3 to 5 mm per minute). The appliance under test shall be placed under the dripping equipment in its normal operating position. The bottom of the equipment shall be larger than the horizontal projection of the appliance under test. The support of the appliance under test shall be smaller than the bottom of the appliance, except for appliances intended to be mounted on a wall or ceiling. Appliances mounted on a wall or ceiling shall be mounted on a wooden board in the normal use position. The size of the wooden board shall be equal to the contact area of the appliance with the wall or ceiling in normal use. The test duration is 10 min
The test equipment and rainfall are the same as for level 1 of this table. The test shall be conducted for 2.5 min at each of the 4 fixed tilted positions of the appliance. These 4 positions are tilted 15° from the vertical line on 2 mutually perpendicular planes.
The total test duration is 10min
When the size and shape of the tested appliance can be accommodated under the oscillating pipe with a radius not exceeding 1m as shown in Figure 4, this equipment shall be used for the test. If this is not possible, the hand-held water sprayer in Figure 5 shall be used for the test. The test conditions when using the equipment in Figure 4 are:
The water pressure is about 80 kPa (0.8 bar）
The water source should be able to supply at least 10L of water per minute.
The oscillating pipe is provided with water spray holes in the arc section of 60° on both sides of the center point and is fixed in a vertical position. The tested appliance is placed on a turntable close to the center of the semicircular oscillating pipe. The turntable rotates around its vertical axis at an appropriate speed so that all parts of the appliance are wetted during the test. The test duration is at least 10 min.
If the housing cannot be rotated on the turntable, the housing should be placed at the center of the semicircle of the oscillating pipe, and the oscillating pipe should be swung 60° on both sides of the vertical line at a speed of 60r/s for 5 min, and then the housing should be rotated 90° in the horizontal direction and tested for another 5 min. Test conditions when using the equipment in Figure 5:
The movable baffle should be installed during the test.
The water pressure is adjusted to a water spray rate of (10±0.5)L/min, which is about 80~100kPa (0.8～1.0 bar). Test duration: calculated according to the surface area of the tested appliance (excluding any installation area, 1 min per square meter, but at least 5 min
The conditions for using the equipment in Figure 4 or Figure 5 are the same as those in Level 3 of this table. Test conditions when using the equipment in Figure 4:
The swing pipe should be covered with water spray holes within a semicircle of 180°. The test time, turntable speed and water pressure are the same as those in Level 3 of this table. The support of the tested appliance should have holes to avoid blocking the water flow. The swing pipe swings to the maximum extent to each side at an angular speed of 60° per second, so that the appliance is splashed in all directions. Test conditions when using the equipment in Figure 5:
Remove the movable baffle on the sprinkler so that the appliance is sprayed in all directions. The water spray rate and the water spray time per unit area are the same as those in Level 3 of this table131
The second characterizing number
GB/T 4942.2 --93
Continued Table 4
Test method and conditions
Use the standard nozzle shown in Figure 6 to spray water on the appliance from all possible directions. The conditions to be observed are as follows: Nozzle inner diameter: 6.3mm
Water spray rate: (12.5±0.625))L/min Nozzle water pressure: about 30kPa (0.3bar) (equivalent to a free jet height of 2.5m in the vertical direction). Test time: 1 min per square meter calculated based on the surface area of the tested appliance, but at least 3 min. Nozzle distance: about 3m from the surface of the tested appliance (but in order to spray the appliance from all directions, this distance can be shortened appropriately if necessary)
The test equipment is the same as level 5 of this table, and the conditions to be observed are as follows: Nozzle inner diameter: 12.5mm
Water spray rate: (100±5)L/min
Nozzle water pressure: about 100kPa (1bar) (equivalent to a vertical free jet height of 8m). Test time: 1min per square meter calculated based on the surface area of the tested appliance, but at least 3min. Nozzle distance: about 3m from the tested appliance (but in order to spray the appliance from all directions, this distance can be shortened appropriately if necessary)
Completely immerse the appliance in water for testing. The water surface should be at least 150mm above the top of the appliance, and the bottom of the appliance should be at least 1m below the water surface. The test duration is at least 30min. The temperature difference between water and electrical appliances is not more than 5℃. The test conditions shall be in accordance with the agreement between the manufacturer and the user, but the severity shall not be less than the requirements of level 7 in this table. 8.2.2 Second characterization digits Qualification assessment after each test After the test is carried out according to the test methods and conditions specified in Table 4, first wipe the outer surface of the appliance dry, and then check whether water has entered the appliance housing. For levels 1 to 7 in Table 4. The amount of water entering the housing shall meet the following requirements and pass the withstand voltage test: The amount of water entering shall not be enough to prevent the normal and reliable operation of the appliance. a.
The influent water shall not accumulate near the cable connector or enter the cable. b.
The influent water shall not overflow into the coil and live parts (referring to those that are not allowed to be used in a damp state). c
d. If the housing has a drain hole, it shall be checked and proved that the water entering the housing will not accumulate and it shall be proved that the drainage of water will not cause harmful effects on the performance of the appliance.
The test voltage value of the withstand voltage test is 50% of the withstand voltage value specified for the electrical product. e.
For the 8° level in Table 4, water is not allowed to enter the shell after the test, and it can be checked and judged by naked eyes. 132
Dimensions are in mm
Part 3
Dimensional tolerance of the part with unspecified tolerance:
Angle: -10
GB/T 4942.2—93
Detailed drawing (example)
Part 2
Figure 1 Standard test finger
1—handle+2—stop plate, 3—insulating material0
Linear dimension: 25 mm and below: =0. 05*25mm and above: ±0.2Test finger material; for example, heat-treated steel or brass The two connecting points of the test finger can be bent within 90°+1 range, but only in the same direction. 30
R2 ± 0. 05
R4 ± 0. 05
Surface C— C
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Part 1
Back shape
GB/T4942.2-93
Figure 2 Dust test equipment
1—Sample, 2—Glass window: 3—Pressure gauge? 4—Dust filter; 5—Air flow meter: 6—Valve; 7—Vacuum pump; 8—Screen; 9—Talc; 10—Vibrator; 11—Circulating pump Sand and sand carbon are used to regulate water flow, and are separated from the waist by metal mesh and absorbent
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Figure 3 Water dripping test equipment
1—Sample
Note: The support should be smaller than the sample.
Water should not accumulate near the cable connector or enter the cable. b.
Water should not overflow into the coil and live parts (referring to those that are not allowed to be used in a damp state). c
d. If the shell has a drain hole, it should be checked and proved that the water entering the shell will not accumulate and it should be proved that the drainage of water will not cause harmful effects on the performance of the appliance.
The test voltage value of the withstand voltage test is 50% of the withstand voltage value specified for the electrical product. e.
For level 8° in Table 4, water is not allowed to enter the shell after the test, and it can be checked and judged by naked eyes. 132
Dimensions in mm
Part 3
Dimensional tolerance of the unspecified tolerance part:
Angle: -10
GB/T 4942.2—93
Detailed drawing (example)
Part 2
Figure 1 Standard test finger
1—handle+2—stop plate, 3—insulating material0
Linear dimension: 25 mm and below: =0. 05*25mm and above: ±0.2Test finger material; for example, heat-treated steel or brass The two connection points of the test finger can be bent within 90°+1, but only in the same direction. 30
R2 ± 0. 05
R4 ± 0. 05
Surface C— C
All sugar examples
Part 1
Back shape
GB/T4942.2-93
Figure 2 Dust test equipment
1—Sample, 2—Glass window: 3—Pressure gauge? 4—Dust filter; 5—Air flow meter: 6—Valve; 7—Vacuum pump; 8—Screen; 9—Talc; 10—Vibrator; 11—Circulating pump Sand and sand carbon are used to regulate water flow, and are separated from the waist by metal mesh and absorbent
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Qn0666666686866666
T8885535558688
Figure 3 Water dripping test equipment
1—Sample
Note: The support should be smaller than the sample.
Water should not accumulate near the cable connector or enter the cable. b.
Water should not overflow into the coil and live parts (referring to those that are not allowed to be used in a damp state). c
d. If the shell has a drain hole, it should be checked and proved that the water entering the shell will not accumulate and it should be proved that the drainage of water will not cause harmful effects on the performance of the appliance.
The test voltage value of the withstand voltage test is 50% of the withstand voltage value specified for the electrical product. e.
For level 8° in Table 4, water is not allowed to enter the shell after the test, and it can be checked and judged by naked eyes. 132
Dimensions in mm
Part 3
Dimensional tolerance of the unspecified tolerance part:
Angle: -10
GB/T 4942.2—93
Detailed drawing (example)
Part 2
Figure 1 Standard test finger
1—handle+2—stop plate, 3—insulating material0
Linear dimension: 25 mm and below: =0. 05*25mm and above: ±0.2Test finger material; for example, heat-treated steel or brass The two connection points of the test finger can be bent within 90°+1, but only in the same direction. 30
R2 ± 0. 05
R4 ± 0. 05
Surface C— C
All sugar examples
Part 1
Back shape
GB/T4942.2-93
Figure 2 Dust test equipment
1—Sample, 2—Glass window: 3—Pressure gauge? 4—Dust filter; 5—Air flow meter: 6—Valve; 7—Vacuum pump; 8—Screen; 9—Talc; 10—Vibrator; 11—Circulating pump Sand and sand carbon are used to regulate water flow, and are separated from the waist by metal mesh and absorbent
popoo6p6bb6aopa
Qn0666666686866666
T8885535558688
Figure 3 Water dripping test equipment
1—Sample
Note: The support should be smaller than the sample.
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