Some standard content:
Mechanical Industry Standard of the People's Republic of China
JB/T7818-1995
Changeover switch for welding machine
Issued on November 24, 1995
Ministry of Machinery Industry of the People's Republic of China
Implemented on July 1, 1996
Mechanical Industry Standard of the People's Republic of China
Changeover switch for welding machine
1 Subject content and scope of application
JB/T7818-1995
This standard specifies the terminology, product classification, technical requirements, test methods, inspection rules, and marking, packaging, transportation and storage of changeover switch for welding machine.
This standard applies to changeover switch for welding machine (hereinafter referred to as switch), which can be used to adjust the current of 500A and below, and the rated voltage of AC 380V·50Hz (60H2) and below as the main circuit of electrical equipment and the conversion of auxiliary electrical appliances on welding machines. 2 Reference standards
GB/T 14048.193
GB14048.3—93
GB4027-84
GB5169.484
GB2828-87
GB/T2900.18-92
GB13384--92
3 Terms, symbols, codes
3.1 Terms
Low-voltage switchgear and controlgear General provisions
Low-voltage switch disconnectors, disconnectors and fuse combination electrical insulation materials under humid conditions, comparative tracking index, fire hazard test for electrical and electronic products, glow wire test methods and guidelines, batch inspection, counting sampling procedures and sampling tables, electrical terminology, low-voltage electrical appliances
General technical conditions for packaging of electromechanical products
Terms not specified in this standard can be found in the relevant terms and definitions in GB/T2900.18. 3.1.1 Arc welding machine
A welding machine that uses an arc to supply welding energy.
3.1.2 Carbon dioxide arc welding machine
A welding machine that uses a melting electrode and CO: as the main shielding gas. 3.1.3 Resistance welding machine: A welding machine that uses the resistance between the workpiece and the welding contact surface to generate heat and pressurizes the weld for welding.
Operation cycle (mechanical switch)
Continuous operation of switching from one position to another and then returning to the starting position. If there are multiple positions, it is necessary to pass through all other positions.
3.1.5 Pollution level of environmental conditions
The level of environmental conditions is determined based on the size of conductive or hygroscopic dust, free gas or salts and relative humidity, as well as the particle size that causes the surface dielectric strength and resistivity to decrease due to moisture absorption or condensation. The pollution level of this standard refers to the pollution level of the micro environment. 3.1.6 Impulse withstand voltage (test voltage)
The highest peak value of the impulse voltage with a certain shape and polarity that does not cause breakdown under the specified test conditions. 3.2 Symbols
The main symbols used in this international standard are as follows: Approved by the Ministry of Machinery Industry on November 24, 1995
Implementation on July 1, 1996
U. Rated working voltage
1 Switch-on current
U Power supply voltage before switching on
Rated working current
Breaking current
U. Power frequency recovery voltage
Ac AC
CTI Comparative tracking index
Hz frequency
Rated insulation voltage
Use category and code
JB/T7818-1995
AC21 Switching on and off resistive load, including appropriate overload. Product classification
4.1 Basic parameters
Rated frequency 50Hz or 60Hz.
According to the rated working current, it is divided into 25, 40, 63, 125, 160, 250, 500. Rated working voltage
AC380V, AC220V.
4.1.4 Rated insulation voltage 500V.
4.2 Classification
According to the shape of the contact:
Contact type;
Lip contact type.
According to the number of poles:
Single pole;
Double pole;
Three pole.
According to the purpose:
Tap-type AC arc welding machine;
Carbon dioxide arc welding machine;
Resistance welding machine.
According to the conversion angle and the number of gears, as shown in Table 1.
Note: \√\ indicates that this specification is available. Www.bzxZ.net
According to the installation method:
Installation in front of the board:
Installation behind the board.
5 Marking
JB/T7818-1995
The nameplate of the product should be installed in a fixed position, and its marking should be clear, easy to identify, and indelible. Each product should have the following markings:
Manufacturer's name or trademark;
Product model and name;
Standard number;
Rated working voltage;
Rated working current;
Manufacture year and month.
The terminal markings of the switch should be clear and permanent. 5.2
Normal working conditions
The switch should work normally under the following specified conditions. 6.1 Ambient air temperature
6.1.1 The upper limit of the ambient air temperature shall not exceed 40°C. 6.1.2 The lower limit of the ambient air temperature shall not be less than -25°C. 6.1.3 The average value within 24 hours shall not exceed 35°C. 6.2 Altitude
The altitude of the installation site shall not exceed 2000m.
6.3 Atmospheric conditions
The relative humidity of the atmosphere shall not exceed 50% when the ambient air temperature is 40℃; higher relative humidity may be allowed at lower temperatures, the average maximum relative humidity of the wettest month is 90%, and the average minimum temperature of the month is 25℃, and condensation on the surface of the product due to temperature changes shall be taken into account.
The pollution level of the surrounding environment is level 3.
6.5 Installation conditions
6.5.1 Installation category
The installation category is .I and Ⅲ.
6.5.2 Installation conditions
The switch can be installed in any inclined position. 7
Technical requirements
The switch shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures. 7.1 Structural requirements
7.1.1 Materials
The switch shall select suitable materials that meet the requirements of this standard and comply with the relevant test requirements. Special attention shall be paid to the flame retardancy and moisture resistance of the materials and the necessity of protecting certain insulating materials from moisture. 7.1.1.1 The insulating materials used in material group III of the switch shall be able to withstand the fire hazard test specified in the new GB5169.4. 7.1.1.2 The comparative tracking index (CTI) of the insulating material shall not be less than 100, and it shall be able to withstand the fire hazard test specified in Article 8.2.2.2.
7. 1. 1. 3
Heat resistance
JB/T7818-1995
Under normal operating conditions of the switch, there shall be no harmful damage at the highest temperature that may be reached. The verification of heat resistance shall be in accordance with Article 8.1.3 of GB/T14048.1-93.
7.1.1.4 Rust resistance
The ferrous metal parts of the switch (including the housing and cover) shall be protected against rust. The test method for verifying the rust resistance shall comply with Article 8.1.5 of GB/T14048.1-93.
2 The indication of the switch indicating the switching position shall be clear. When the handle stays in any position, the deviation angle of its center line is: 7. 1. 2
45° and below shall not exceed 5°
60° and above shall not exceed 10°.
The rotating part of the switch shall be flexible and reliable. The mechanism of the switch shall enable the contacts to be placed in the closed position or the open position only. The operating force acting on the handle shall not exceed the provisions of Table 2. Table 2
Operating force (N)
≤100
≤120
Class II is 5.5mm, and the creepage distance is not less than 6.3mm. The electrical clearance of the switch is 3mm for Class 1. All fastening joints of the switch shall not be loose. The wiring terminals of the switch shall ensure good contact and have sufficient mechanical strength. Table 3 Tightening torque (MN) Appearance requirements All ferrous metal parts shall have an anti-corrosion protective layer; plastic parts shall be flat and free of cracks and falling pieces: 63 The signs and transparent covers indicating the position of the handle shall be clear and neat, without obvious scratches; the signs on the switch housing shall be clear and permanent. 7.2 Performance requirements
160~500
The tightening torque of the terminal is shown in Table 3.
Under normal conditions, the temperature rise of the terminal shall not exceed the value specified in Table 4 when the rated working current is passed through the switch. Table 4
Terminal materials
Bare brass
Copper (brass) silver-plated or nickel-plated
Other metals
7.2.2 Dielectric properties
Temperature rise limit (K)
The insulation of the switch must be able to withstand the test voltage specified in Table 5 for 1 min without breakdown or surface flashover. 16
Working type
Used alone in the primary or secondary of electric welding machine
Used for both primary and secondary of welding machine
7.2.3 Making and breaking capacity
JB/T78181995
Test voltage (V)
Voltage application part
Between metal parts and grounded parts, between charged parts of different polarities Between primary contact and secondary contact
Between metal parts and grounded parts
The making and breaking capacity of the switch complies with the provisions of Article 7.2.4.1 of GB14048.3, as shown in Table 6. Table 6
Use category
7.2.4 Mechanical life
Rated working power
All currents
The mechanical operating performance of the switch is the no-load operating cycle that the switch can withstand without repairing or replacing any mechanical parts. Each operating cycle should be a continuous operation of switching from one position to another and returning to the starting position. If there are multiple positions, it is necessary to pass through all other positions. The number of mechanical life times for lip contact type switches is 10,000 times, and for contact type switches is 100,000 times. If the user has special requirements, it can be negotiated and decided by the supply and demand parties.
7.2.5 Electrical life
The electrical operating performance of the switch is the loaded operating cycle that the switch does not need to repair or replace any mechanical parts. The connection and disconnection of the switch is regarded as one operation cycle. The number of electrical life times and parameters should comply with the provisions of Table 7. Table 7
Rated current
All currents
7.2.6 Rated fusing short-circuit current
0.4±0.05
0.4±0.05
Mechanical life 80%
Rated fusing short-circuit current of the switch Under the specified conditions of use, when the power supply side is equipped with an RL6 type spiral fuse as a current limiting short-circuit protection device, the rated current of the fuse should be equal to the maximum rated working current of the switch, and after withstanding the expected current value of 1000A under the conditions specified in Table 8, the switch should be able to meet the specified requirements. Table 8
Expected current (A)
Test voltage (V)
Rated fuse short-circuit withstand capacity
Power factor
Test times
Time interval ohm min
The rated fuse short-circuit withstand capacity of the switch is 12 times the rated working current. Under the specified test conditions, it can carry the current without any damage, and the current duration is 1s.
7.2.8 Damp and heat performance
The switch must be able to withstand the alternating damp and heat test of GB2423.4 test Db with a severity level of 40℃ for 6 cycles. After the test, its insulation resistance value is not less than 1M0, and it can withstand the 80% withstand voltage test specified in Table 5 of Article 7.2.2. 7.2.9 Low temperature resistance
The low temperature adaptability of the switch shall comply with the provisions of GB2423.1 test A, and its severity level is -25℃. The allowable deviation is 3℃, the duration is 16h, and it is restored under normal use conditions. The recovery time is to reach temperature stability, but not less than 1h. After the test, the switch should still meet the requirements of 7.1.3, 7.1.4, 7.2.2 and 7.1.8 b and c. 5
8 Test
8.1 Inspection rules
JB/T 7818—1995
The switch must be inspected and qualified by the factory quality inspection department before it can leave the factory, and a product quality certificate must be attached. 8.1.1 The test and inspection of the switch are mainly divided into the following types: 8. Type test;
b. Periodic test;
Factory inspection.
8.1.2 Type test
The type test of the switch shall be conducted in one of the following cases: a. When the trial production of the switch sample is completed; b. When the switch is transferred to another factory for repeated trial production.
When the design, manufacturing process, raw materials used or component structure of the switch are changed, which may affect its working performance, it is necessary to re-conduct the type test of the relevant items. The switch used for type test must be a formal trial production sample with complete main manufacturing process equipment. There should be no less than 2 sets for each test item. The test procedure is specified in Article 8.1.2.2. The type test of the switch can be considered qualified only when all test items can pass and all test samples are qualified. Otherwise, the reasons must be analyzed, technical measures must be taken, and even the design, process, and tooling must be improved and re-conducted until the type test is qualified.
Type test items
General inspection (7.1.2, 7.1.3, 7.1.4, 7.1.5, 7.1.6, 7.1.8); Comparative tracking index (CTI) test of insulating materials and fire hazard test of insulating parts (7.1.1.1, 7.1.1.2); Heat resistance test of switches (7.1.1.3); Rust resistance test (7.1.1.4);
Mechanical properties test of terminal blocks (7.1.7); Temperature rise test (7.2.1);
Power frequency withstand voltage test (7.2.2);
Rated making and breaking capacity test (7.2.3); Rated fuse short-circuit current test (7.2.6); Rated Fuse short circuit withstand capacity test (Article 7.2.7); Mechanical operating performance test (Article 7.2.4; Electrical operating performance test (Article 7.2.5); Damp heat test (Article 7.2.8); Low temperature test (Article 7.2.9), Type test procedure Rated making and breaking capacity test JB/T7818-1995 General inspection Note: If there is any doubt about the temperature rise, the test in the virtual frame must be carried out. 8.1.3 Periodic test For switches that are officially put into production, periodic tests should be carried out every 4 years. 8.1.3.1 Periodic test rules |tt||Switches used for periodic tests must be randomly selected from batches (large quantities) of products that have passed factory inspection. There should be no less than 2 units for each test item. The product can be considered to have passed the periodic test only if all the specified test items can pass and all the test products are qualified. If one item in the test fails, the item is allowed to be retested with double the original sampling quantity. If all the doubled quantities in the retest pass, the periodic test can still be considered to have passed. If there is still one item that fails, the periodic test fails. 8.1.3.2 Periodic test items
General inspection (7.1.2, 7.1.3, 7.1.4, 7.1.5, 7.1.6, 7.1.8); machine strength test of terminal blocks (7.1.7); temperature rise test (7 .2.1);
Power frequency withstand voltage test (Article 7.2.2);
Rated connecting and disconnecting capacity test (Article 7, 2.3); Mechanical operating performance test (Article 7, 2.4); Electrical operating performance test (Article 7.2.5);
Wet heat test (Article 7.2.8).
Periodic test procedure
According to Article 8.1.2.2.
8.1.4 Factory inspection
Factory inspection is divided into routine test and factory sampling inspection. 8.1.4.1 Routine test
JB/T7818-1995
Routine test is a test that must be carried out on each product before the product is officially shipped. Its purpose is to detect defects in materials, processes and assembly.
Routine test items
8. 1. 4. 1.1
a. Operation test (no-load operation);
b. Power frequency withstand voltage test (1s).
8.1.4.1.2 Routine test rules
The items of the routine test must be carried out one by one on each switch. Products that fail the routine test must be returned for repair one by one until they pass the test completely. If they cannot be repaired, they should be scrapped. 8.1.4.2 Factory sampling test
The sampling test is a sampling inspection and test that must be carried out before the switch is officially shipped out of the factory, and it shall be inspected in accordance with GB2828. 8.1.4.2.1 Sampling plan
It is stipulated that two sampling inspection plans shall be carried out.
8.1.4.2.2 Inspection level
Inspection level II shall be adopted.
8.1.4.2.3 Factory sampling test items
For factory sampling test items, please refer to Table 10. When inspecting each item according to GB2828, the qualified quality levels of different items are specified in Table 10. Table 10
Installation dimensions, overall dimensions
Nameplate marking (Article 5.1)
Terminal marking (Article 5.2)
The rotating part of the switch is flexible and reliable (Article 7.1.3) Purpose
All fastening connections of the switch must not be loose (Article 7.1.6) All ferrous metal protective layers of the switch (Article 7.1.8) Electrical clearance and electrical distance (Article 7.1.5) 8.2 Test method
Qualified quality level
8.2.1 The appearance of the switch shall be inspected visually. The mark on the switch casing shall be rubbed back and forth 15 times in about 15 seconds with a piece of absorbent cotton soaked in distilled water at a pressure of 2N. Then, the previous method shall be repeated with a piece of absorbent cotton soaked in gasoline. The mark can still be identified and there is no warping.
8.2.2 Structural test
8.2.2.1 Determination of comparative tracking index (CTI) of insulating materials The determination of comparative tracking index of insulating materials shall be carried out in accordance with the test methods, test equipment and test procedures specified in GB4027. The CTI value and group of the insulating materials used can also replace the CTI determination of insulating materials if the manufacturer obtains data from the insulating material factory or other reliable sources to prove that the insulating materials meet the CTI value required by the switch. 8.2.2.2 Fire hazard test of insulating materials
The fire hazard test of insulating materials shall be in accordance with GB5169.4. The temperature at the top of the glow wire and the test time applied to the test piece shall be in accordance with the provisions of Table 11.
Carrying current-carrying parts and grounding parts
Not carrying current-carrying parts and grounding parts
8.2.2.3 Heat resistance test
JB/T78181995
Test temperature of the end of the glow wire
960±15
650±10
For the heat resistance test of the switch, see 8.1.3.1 of CB/T14048.1-93. 8.2.2.4 Rust resistance test
For the rust resistance test, see 8.1.5 of GB/T14048.1-93. ℃
8.2.2.5 Deviation of the center line of the switch handle, the accurate positioning of the replacement position is measured with an inclinometer. 8.2.2.6 Measurement of operating force
Test time
The measuring tool for handle operation should have an accuracy of ±5%, torque M (N·m), operating force F (N), F=M/(L, + L,), see Figure 1. The dimensions are measured with a measuring tool with an accuracy of 0.02. F
8.2.2.7 Measurement of electrical clearance and creepage distance The measurement and calculation methods of electrical clearance and creepage distance are shown in Appendix A of GB/T14048.1-93. 8.2.2.8 Mechanical strength test
The mechanical strength test of the terminal block shall comply with Article 8.1.8.2 of GB/T14048.1-93. 8.2.3 Temperature rise test
The switch shall be installed in the use position, and the thermocouple weldable contacts shall be screwed on the screws and the handle. The test parameters shall comply with Article 8.2.3.3.3 of GB/T14048.1-93.
8.2.4 Dielectric strength test
The dielectric strength test of the switch shall be in accordance with Article 8.2.3.4.3 of GB/T14048.1-93. 8.2.5 Rated connecting and disconnecting capacity test
The connecting and disconnecting operation times of the switch shall be 5 times respectively, and the power-on time of each time shall be greater than or equal to 0.05$. The interval between the disconnecting operation and the subsequent connecting operation shall be 5~105, and the test parameters shall be in accordance with Article 7.2.3 of this standard. 8.2.6 Life test
8.2.6.1 Mechanical life
The switch shall be installed as it is used, and its test parameters shall be in accordance with Article 7.2.4 of this standard, and the operation rate shall be 300 times/h. 8.2.6.2 Electrical life
The switch shall be installed as it is used, and the test parameters shall be in accordance with Article 7.2.5 of this standard. The contact closure time for each time shall not be less than 0.06s, and the operating frequency shall be 120 times/h.
8.2.7 Rated fuse short-circuit current test and rated fuse short-circuit withstand capacity test The rated fuse short-circuit current test and rated fuse short-circuit withstand capacity test shall be in accordance with Article 8.2.6.2 of GB14048.3-93. 9
8.2.8 Damp heat test
JB/T7818-1995
The alternating damp heat test of the switch shall be carried out in accordance with GB2423.4Db. The temperature during cooling shall be selected to be not less than 95%. Before the end of the conditional test (low temperature and high humidity stage), the power frequency withstand voltage of the test product shall be verified for 1h to 2h, and the insulation resistance of the test product shall be tested at the same time. 8.2.9 Low temperature resistance test
The low temperature resistance test of the switch shall be carried out in accordance with Article 7.2.9 of GB/T14048.1. 9 Packaging, transportation and storage
9.1 Packaging
9.1.1 The packaging of the switch must be able to prevent damage during transportation, should be moisture-proof, and should comply with the relevant provisions of GB13384-92. It should be tight and shock-resistant and suitable for transportation and loading. The packing box should contain a packing list, product certificate, and instruction manual. The gross weight of each piece shall not exceed 20kg.
9.1.2 The markings on the outside of the switch packing box should be clear and neat, and ensure that they are not blurred due to long-term transportation and storage. The markings include the following: a.
Manufacturer name or trademark;
Product name and model;
Product quantity;
The "length × width × height" dimensions and gross weight of the packing box; the name and address of the consignee;
Marked with words or logos such as "electrical appliance", "handle with care", "fear of moisture", "upward" and the year and month of packaging. 9.2 Transportation and storage
The transportation and storage of the product shall comply with the provisions of Article 10.4 of GB/T14048.1. The environmental conditions for transportation and storage are that the high temperature is not higher than 40℃, the low temperature is not lower than -25℃, the relative humidity does not exceed 95% (at 25℃), the free fall height is 250mm, the surrounding air is free of acidic and chemical vapors, and it must not be attacked by rain. Additional remarks:
This standard was proposed and managed by the Shanghai Electric Science Research Institute of the Ministry of Machinery Industry. This standard was drafted by Zhejiang Yiwu Switch Factory, and Chengdu Electric Welding Machine Research Institute, Shanghai Electric Welding Machine Factory, Chengdu Electric Welding Machine Factory, East China Electric Welding Machine Factory and other units participated in the drafting.
The main drafter of this standard: Liu Yuehua.6 Measurement of operating force
Test time
The measuring tool for handle operation should have an accuracy of ±5%, torque M (N·m), operating force F (N), F=M/(L, + L,), see Figure 1. The dimensions are measured with a measuring tool with an accuracy of 0.02. F
8.2.2.7 Measurement of electrical clearance and creepage distance The measurement and calculation methods of electrical clearance and creepage distance are shown in Appendix A of GB/T14048.1-93. 8.2.2.8 Mechanical strength test
The mechanical strength test of the terminal block shall comply with Articles 8.1.8.2 of GB/T14048.1-93. 8.2.3 Temperature rise test
The switch shall be installed in the use position, and the thermocouple weldable contacts shall be screwed on the screws and the handle. The test parameters shall comply with Article 8.2.3.3.3 of GB/T14048.1-93.
8.2.4 Dielectric strength test
The dielectric strength test of the switch shall be in accordance with Article 8.2.3.4.3 of GB/T14048.1-93. 8.2.5 Rated connecting and disconnecting capacity test
The connecting and disconnecting operation times of the switch shall be 5 times respectively, and the power-on time of each time shall be greater than or equal to 0.05$. The interval between the disconnecting operation and the subsequent connecting operation shall be 5~105, and the test parameters shall be in accordance with Article 7.2.3 of this standard. 8.2.6 Life test
8.2.6.1 Mechanical life
The switch shall be installed as it is used, and its test parameters shall be in accordance with Article 7.2.4 of this standard, and the operation rate shall be 300 times/h. 8.2.6.2 Electrical life
The switch shall be installed as it is used, and the test parameters shall be in accordance with Article 7.2.5 of this standard. The contact closure time for each time shall not be less than 0.06s, and the operating frequency shall be 120 times/h.
8.2.7 Rated fuse short-circuit current test and rated fuse short-circuit withstand capacity test The rated fuse short-circuit current test and rated fuse short-circuit withstand capacity test shall be in accordance with Article 8.2.6.2 of GB14048.3-93. 9
8.2.8 Damp heat test
JB/T7818-1995
The alternating damp heat test of the switch shall be carried out in accordance with GB2423.4Db. The temperature during cooling shall be selected to be not less than 95%. Before the end of the conditional test (low temperature and high humidity stage), the power frequency withstand voltage of the test product shall be verified for 1h to 2h, and the insulation resistance of the test product shall be tested at the same time. 8.2.9 Low temperature resistance test
The low temperature resistance test of the switch shall be carried out in accordance with Article 7.2.9 of GB/T14048.1. 9 Packaging, transportation and storage
9.1 Packaging
9.1.1 The packaging of the switch must be able to prevent damage during transportation, should be moisture-proof, and should comply with the relevant provisions of GB13384-92. It should be tight and shock-resistant and suitable for transportation and loading. The packing box should contain a packing list, product certificate, and instruction manual. The gross weight of each piece shall not exceed 20kg.
9.1.2 The markings on the outside of the switch packing box should be clear and neat, and ensure that they are not blurred due to long-term transportation and storage. The markings include the following: a.
Manufacturer name or trademark;
Product name and model;
Product quantity;
The "length × width × height" dimensions and gross weight of the packing box; the name and address of the consignee;
Marked with words or logos such as "electrical appliance", "handle with care", "fear of moisture", "upward" and the year and month of packaging. 9.2 Transportation and storage
The transportation and storage of the product shall comply with the provisions of Article 10.4 of GB/T14048.1. The environmental conditions for transportation and storage are that the high temperature is not higher than 40℃, the low temperature is not lower than -25℃, the relative humidity does not exceed 95% (at 25℃), the free fall height is 250mm, the surrounding air is free of acidic and chemical vapors, and it must not be attacked by rain. Additional remarks:
This standard was proposed and managed by the Shanghai Electric Science Research Institute of the Ministry of Machinery Industry. This standard was drafted by Zhejiang Yiwu Switch Factory, and Chengdu Electric Welding Machine Research Institute, Shanghai Electric Welding Machine Factory, Chengdu Electric Welding Machine Factory, East China Electric Welding Machine Factory and other units participated in the drafting.
The main drafter of this standard: Liu Yuehua.6 Measurement of operating force
Test time
The measuring tool for handle operation should have an accuracy of ±5%, torque M (N·m), operating force F (N), F=M/(L, + L,), see Figure 1. The dimensions are measured with a measuring tool with an accuracy of 0.02. F
8.2.2.7 Measurement of electrical clearance and creepage distance The measurement and calculation methods of electrical clearance and creepage distance are shown in Appendix A of GB/T14048.1-93. 8.2.2.8 Mechanical strength test
The mechanical strength test of the terminal block shall comply with Articles 8.1.8.2 of GB/T14048.1-93. 8.2.3 Temperature rise test
The switch shall be installed in the use position, and the thermocouple weldable contacts shall be screwed on the screws and the handle. The test parameters shall comply with Article 8.2.3.3.3 of GB/T14048.1-93.
8.2.4 Dielectric strength test
The dielectric strength test of the switch shall be in accordance with Article 8.2.3.4.3 of GB/T14048.1-93. 8.2.5 Rated connecting and disconnecting capacity test
The connecting and disconnecting operation times of the switch shall be 5 times respectively, and the power-on time of each time shall be greater than or equal to 0.05$. The interval between the disconnecting operation and the subsequent connecting operation shall be 5~105, and the test parameters shall be in accordance with Article 7.2.3 of this standard. 8.2.6 Life test
8.2.6.1 Mechanical life
The switch shall be installed as it is used, and its test parameters shall be in accordance with Article 7.2.4 of this standard, and the operation rate shall be 300 times/h. 8.2.6.2 Electrical life
The switch shall be installed as it is used, and the test parameters shall be in accordance with Article 7.2.5 of this standard. The contact closure time for each time shall not be less than 0.06s, and the operating frequency shall be 120 times/h.
8.2.7 Rated fuse short-circuit current test and rated fuse short-circuit withstand capacity test The rated fuse short-circuit current test and rated fuse short-circuit withstand capacity test shall be in accordance with Article 8.2.6.2 of GB14048.3-93. 9
8.2.8 Damp heat test
JB/T7818-1995
The alternating damp heat test of the switch shall be carried out in accordance with GB2423.4Db. The temperature during cooling shall be selected to be not less than 95%. Before the end of the conditional test (low temperature and high humidity stage), the power frequency withstand voltage of the test product shall be verified for 1h to 2h, and the insulation resistance of the test product shall be tested at the same time. 8.2.9 Low temperature resistance test
The low temperature resistance test of the switch shall be carried out in accordance with Article 7.2.9 of GB/T14048.1. 9 Packaging, transportation and storage
9.1 Packaging
9.1.1 The packaging of the switch must be able to prevent damage during transportation, should be moisture-proof, and should comply with the relevant provisions of GB13384-92. It should be tight and shock-resistant and suitable for transportation and loading. The packing box should contain a packing list, product certificate, and instruction manual. The gross weight of each piece shall not exceed 20kg.
9.1.2 The markings on the outside of the switch packing box should be clear and neat, and ensure that they are not blurred due to long-term transportation and storage. The markings include the following: a.
Manufacturer name or trademark;
Product name and model;
Product quantity;
The "length × width × height" dimensions and gross weight of the packing box; the name and address of the consignee;
Marked with words or logos such as "electrical appliance", "handle with care", "fear of moisture", "upward" and the year and month of packaging. 9.2 Transportation and storage
The transportation and storage of the product shall comply with the provisions of Article 10.4 of GB/T14048.1. The environmental conditions for transportation and storage are that the high temperature is not higher than 40℃, the low temperature is not lower than -25℃, the relative humidity does not exceed 95% (at 25℃), the free fall height is 250mm, the surrounding air is free of acidic and chemical vapors, and it must not be attacked by rain. Additional remarks:
This standard was proposed and managed by the Shanghai Electric Science Research Institute of the Ministry of Machinery Industry. This standard was drafted by Zhejiang Yiwu Switch Factory, and Chengdu Electric Welding Machine Research Institute, Shanghai Electric Welding Machine Factory, Chengdu Electric Welding Machine Factory, East China Electric Welding Machine Factory and other units participated in the drafting.
The main drafter of this standard: Liu Yuehua.
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