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Machinery Industry Standard of the People's Republic of China
Explosion-proof lighting switch for factory
JB6750-93
This standard specifies the product classification, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of explosion-proof lighting switches for factory (hereinafter referred to as switches). This standard applies to the design, manufacture and inspection of switches. The switch is mainly used in factory lighting circuits with explosive gases and corrosive media in the surrounding environment to switch on and off lighting and signal circuits. 2 Reference standards
National standards
GB10979
GB/T13384
JB3284
JB4262
JB4324
JB4375
Basic environmental test procedures for electrical and electronic productsTest A: Low temperature test methodBasic environmental test procedures for electrical and electronic productsTest Db: Alternating damp heat test methodExplosion-proof electrical equipment for explosive atmospheres
Explosion-proof electrical equipment for explosive atmospheres
Explosion-proof electrical equipment for explosive atmospheres
Protection grade of low-voltage electrical enclosures
Low-voltage switchgear and Control equipment
Lighting switches for household and similar purposes
General requirements
Flameproof electrical equipment*d”
Increased safety electrical equipment\e”
General technical conditions for packaging of electromechanical products
Basic environmental conditions and test methods for transportation, transportation and storage of motors and electrical products Rubber-sheathed cable entry devices for explosion-proof electrical appliances
Test methods for chemical gas corrosion of electrical products Environmental conditions for use of electrical products in outdoor and indoor corrosive locations 3 Product classification and basic parameters
3.1 Product classification
3.1.1 According to the place of use:
Indoor use;
Outdoor use.
According to the anti-corrosion performance:
Anti-light corrosion;
Anti-medium corrosion;
Anti-severe corrosion.
According to the shell material:
Metal shell;
Plastic shell.
Approved by the Ministry of Machinery Industry on August 21, 1993
Implementation of 1993-1001
3.1.4 According to the structural type of the cable entry device: compression nut type;
steel pipe wiring type.
According to the number of contact poles:
single pole;
double pole.
According to the explosion-proof type:
coal-proof type:
JB6750-93
combined type (combination of explosion-proof type and increased safety type). According to the protection type:
with short-circuit protection;
without short-circuit protection.
Basic parameters
AC power frequency: 50Hz;
Rated working voltage: AC 127, 220V, DC 110, 220V; Rated working current: 1, 2, 4, 6.3, 1016, 20A; Working system: long-term working system.
Technical requirements
The switch shall comply with the requirements of this standard and be inspected by the nationally recognized quality supervision and inspection department in accordance with the prescribed procedures. The switch shall be manufactured with drawings and technical documents approved by the inspection department and can only be produced after obtaining the "explosion-proof certificate" issued by the inspection department. 4.3
In addition to complying with the provisions of the standard, the technical indicators of the switch components shall also comply with the requirements of their respective product standards. The switch for corrosion protection should be able to work normally under the following conditions: 2. The altitude should not exceed 2000m;
The ambient temperature should be -20~40℃;
The relative humidity of the surrounding air should not exceed 95% (at 25℃); In the environment containing explosive gas;
In the place without significant vibration and severe impact; In the environment without obvious damage to insulating gas or steam; The installation inclination with the vertical plane should not exceed 5°; The place can prevent dripping water and other liquids from intruding; Pollution level: 3;
Installation category:;
The switch used for outdoor should also adapt to: Relative humidity 100%; Maximum radiation intensity 1120W/m. Rainfall intensity k.
Sram/min.
4.2.2 In addition to meeting the requirements of 4.2.1, the switch for medium corrosion protection and heavy corrosion protection must also meet the relevant provisions of JB4375. 4.3 Structural requirements
4.3.1 The switch operating handle must be flexible and reliable. , .3.2 The electrical clearance and creepage distance of the switch must comply with the following provisions. .3.2.1 The electrical clearance and creepage distance inside the switch junction box shall comply with the provisions of GB3836.3, Chapter 6 and Chapter 7. 1, 3.2.2 The electrical clearance and creepage distance inside the switch main chamber shall not be less than the provisions in Table 1. 20
Rated insulation voltage or working voltage
127 and below
Electrical clearance
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Electrical distance
Note: ", I, Ia represent the insulation material group. According to its comparative tracking index (CTI), it is divided as follows: Insulation material group 1: CTI ≥ 600
Insulation material group 1: 600> CT400
Insulation material group 1a: 400> CTI> 175
The shell material of the switch must comply with the provisions of Chapter 8 and Chapter 9 of GB3836.1 and Chapter 4 of GB3836.2. All fasteners of the switch must have measures to prevent self-loosening. Ia
4.3.5 All metal parts of the switch should have anti-corrosion measures. For switches that are resistant to medium corrosion and severe corrosion, the exposed fasteners on the casing should be sealed with nitrile or fluoroprene rubber for corrosion protection. 4.3.6 The metal casing of the switch must be equipped with internal and external grounding bolts, which should comply with the provisions of Chapter 16 of GB3836.1 and be marked with the grounding symbol "+". 4.3.7 The surface paint of the switch casing should meet the requirements of different protection levels. The surface of the casing of outdoor switches should be painted with light-colored paint. The inner wall of the switch junction box made of metal shall be coated with arc-resistant paint in accordance with the requirements of Chapter 14 of GB3836.1. 4.3.8 The flameproof surface of the flameproof switch shall be treated with anti-corrosion and meet the requirements of different corrosion protection levels. The flameproof structural parameters of the flameproof casing of the flameproof switch must comply with the provisions of Chapter 7 of GB3836.2. 4. 3.9
The cable entry device and wiring terminals of the switch shall comply with the provisions of Chapter 14 and Chapter 15 of CB3836.1, Chapter 13 of CB3836.2, Chapter 4 and Chapter 5 of GB3638.3 and JB4262 respectively. 4.3.11 A clear and permanent embossed mark "Ex" shall be set on the obvious part of the switch housing, and the explosion-proof type, category, level and temperature group mark may also be marked.
4.3.12 The nameplate of the switch shall be made of copper for the light corrosion resistant type; stainless steel for the medium corrosion resistant type and the heavy corrosion resistant type, and its thickness shall not be less than 0.3mm.
$.4 Performance requirements
4.4.1 The dielectric performance of the switch shall be able to withstand the AC 50Hz, 2000V test voltage value (effective value) for 1min without breakdown and flashover.
The switch shall be moisture resistant and light corrosion resistant The corrosion resistance shall comply with the provisions of Chapter 31 of GB3836.1, and the test severity level is: 4.4.2
Test cycle 12d;
High temperature: 40℃.
When the switch is passed with the agreed heating current, the temperature rise of its terminals and nearby parts shall not exceed the provisions of Table 2 and Table 3, and the maximum surface temperature of the shell shall comply with the provisions of Article 5.1 of GB3836.1. Table
||Terminal Material
Copper (or brass) tin-plated
Copper (or brass) silver-plated or nickel-plated
Other Metals
Terminal Temperature Rise
Approachable Parts
JB6750-93
4.4.4 For switches used outdoors, the effect of sunlight on their temperature rise should be considered. The temperature design can be carried out according to the maximum ambient temperature of 40℃, but the value of the temperature rise margin must be shown in Table 4.
There is a certain margin to offset the effect of sunlight. Table 4
Shell Color
Silver Gray, Light Gray
Temperature Rise Margin
The temperature rise margin value of the shell in the table is the value of the maximum surface temperature reduction allowed in accordance with Table 1 of GB3836.1. Outside
②If the shell is equipped with a protective plate, the temperature rise margin value in the table can be reduced by 30%. The shielding plate cannot be attached to the housing, and a certain height should be left. Its area and shape should be able to block direct sunlight around noon. The breaking capacity of the switch shall comply with the following provisions. 4.4.5
4.4.5.1 The switch shall be capable of operating at 1.1 times the rated working voltage, 1.25 times the rated working current, and a power factor of 0.3±0.05, and conduct 200 operation tests.
4.4.5.2 In addition to complying with the requirements of 4.4.5.1, switches below 16A shall also be connected in series with the capacitor specified in Table 5 at 1.1 times the rated working voltage and conduct 20 operation tests. Table 5
4.4.5.3 In addition to complying with the requirements of 4.4.5.1 and 4.4.5.2, switches below 16A shall also be tested for 20 operations under the conditions of rated working voltage and 1.2 times the rated working current of incandescent lamp load. 4.4.5.4 For switches used in DC circuits, their breaking capacity only needs to comply with the provisions of 4.4.5.1 and 4.4.5.2 above. 4.4.5.5 The test operation rate of the switch shall not be less than 120 times per hour. 4.4.6 The mechanical life of the switch under normal working conditions is 1, 3, 10, 300,000 times. Its operation rate shall not be less than 120 times per hour. 4.4.7 The electrical life of the switch shall be under the condition of rated working voltage and rated working current power factor of 0.6±0.05 (T.$=1ms), and the number of operations shall not be less than 20% (AC load) or 10% (DC load) of the corresponding mechanical life, and the operating frequency shall not be less than 120 times per hour.
4.4.8 For switches with short-circuit protection, the rated limiting (or fusing) short-circuit current is 1000A, the circuit power factor is between 0.5 and 0.7, the test voltage is equal to 1.1 times the rated working voltage, and the test is carried out 3 times, with an interval of not less than 3 minutes each time. The switch shall be able to work normally after each test.
The protection performance of the increased safety housing of the composite switch shall comply with the provisions of IP54 in Chapter 1 of GB4942.2. 4.4.9
The medium corrosion resistant switch shall meet the following requirements after two cycles of corrosion test as specified in Article 5.11: the insulation resistance between the switch casing and the conductive parts, and between the conductive parts insulated from each other, shall not be less than 2Ma; the dielectric properties of the switch shall comply with the provisions of Article 4.4.1; JB675093
c. The action performance and operation performance of the switch shall comply with the provisions of this standard and specific product standards; d. The metal parts and fasteners inside and outside the casing shall not show obvious corrosion, such as verdigris and rust; the surface layer of the casing shall not be soft or obviously flaky, and bubbles with a diameter greater than 1mm shall not appear. The maximum diameter of individual atmospheric bubbles shall not be greater than 10mm on castings and 5mm on steel plate structural parts, and no bottom metal corrosion shall occur (except for welds, gaps, casting surface particles, sharp corners and mechanical damage); f. Plastic shells and plastic parts on the shells shall not bubble, deform or crack; rubber parts shall not corrode, delaminate, crack, deform or become sticky; the hardness change value of sealing rings and sealing gaskets shall not exceed 20% of that before the test;
explosion-proof surfaces shall not be corroded, and the anti-rust oil on the explosion surface shall not deteriorate; h.
1. The nameplate shall not be corroded, lifted or fallen off, and the handwriting on the nameplate shall be clear; no obvious corrosion points shall appear on the conductive parts and tight surrounding parts of small switches. 4.4.11 After the heavy corrosion-resistant switches are subjected to 10-adjustment corrosion tests in accordance with Article 5.11, they shall meet the requirements of Article 4.4.10. 4.4.12 For outdoor switches, if the minimum temperature of the operating environment is lower than -20℃, the impact of low temperature on its performance should be considered. The specific requirements are specified in the product standards.
4.4.13 The static strength test of the flameproof enclosure of the flameproof switch shall comply with the provisions of Article 20.3 of GB3836.2. 4.4.14 The explosion-proof performance of the switch shall comply with the provisions of GB3836.1~3836.3. The impact resistance of the switch housing and housing components shall comply with the provisions of Chapter 24 of GB3836.1. 4.4.15 Days
4.4.16 The aging performance of the switch rubber seal shall comply with the provisions of Chapter 32 of GB3836.1. 5 Test methods
General Principles 2 and GE3836.1~
5.1 The general inspection and action performance inspection of the switch shall be carried out in accordance with the relevant provisions of the national standard "Low Voltage Switchgear and Control Equipment 3836.3".
5.2 The thermal stability test of plastic housing and external parts shall be carried out in accordance with Article 27.2 of GB3836.1. 5.3 The clamping test of the cable entry device of the switch and the torsion test of the terminal shall be carried out in accordance with Chapter 26 and Chapter 30 of GB3836.1 and Chapter 22 of CB3636.2.
5.4 The dielectric property test of the switch shall be carried out in accordance with Article 8.2.3.4 of the national standard "General Rules for Low-voltage Switchgear and Control Equipment". 5.5 The drowning resistance and light chain resistance tests of the switch shall be carried out in accordance with the relevant provisions of GB2423.4. 5.6 The temperature rise test of the switch shall be carried out in accordance with Article 8.2.3.3 of the national standard "General Rules for Low-voltage Switchgear and Control Equipment". 5.7 The switching capacity test of the switch shall be carried out in accordance with Article 8.2.3.5 of the national standard "General Rules for Low-voltage Switchgear and Control Equipment". 5.8 The mechanical and electrical life tests of the switch shall be carried out in accordance with the provisions of Article 8.2.3.7 of the national standard "General Rules for Low-voltage Switchgear and Control Equipment".
Article 8.2.4.4 of the "General Rules"
5.9 The rated fuse short-circuit current test of the switch shall be carried out in accordance with the national standard for low-voltage switchgear and control equipment.
5.10 The switch housing protection level test shall be carried out in accordance with the provisions of GB4942.2. 5.11 The corrosion test of the switch shall be carried out in accordance with the test conditions of the initial theoretical concentration of 17.5mg/L sulfur dioxide specified in Table 1 of JB4324.
When conducting the corrosion test, the insulation resistance of the switch shall be measured in the test box (room) within 3h before the end of the low-temperature stage of the last cycle of the test, and then the dielectric strength test shall be carried out in accordance with the provisions of Article 4.4.1 of this standard. The action performance and operation performance test of the switch shall be carried out as soon as possible after the dielectric strength test by taking the sample out of the test box (room). The appearance inspection shall be carried out after the action performance and operation performance tests. 5.12 The low temperature test of the switch shall be carried out in accordance with the provisions of the low temperature test method for temperature gradient of non-exothermic test samples in test Ab in GB2423.1.
5.13 The static strength test (water pressure test) of the flameproof enclosure of the switch shall be carried out in accordance with the provisions of Section 20.3 of GB3836.2. 23
JB6750-93
5.14 The explosion-proof performance test of the switch shall be carried out in accordance with the relevant provisions of GB3836.1~3836.3. 5.15 The impact test of the outer shell and outer parts of the switch shall be carried out in accordance with the relevant provisions of Chapter 24 of GB3836.1. 5:.161 The aging performance test of the rubber seal of the switch shall be carried out in accordance with the provisions of Chapter 32 of GB3836.1. 6 Inspection rules
The inspection of the switch is divided into type test, periodic test and factory inspection. 61 Type test
6.1.1 Switches shall be subject to type test in the following circumstances: when new products are being trial-produced;
when there are major changes in the structure, process or materials of the switch that may affect product performance; when products that are not frequently produced are being produced again;: when the national quality supervision department proposes a type test requirement. 62
Type test items,
All factory inspection items
Thermal stability test of plastic housing and housing parts; clamping test of introduction device:
Moisture resistance and mild corrosion resistance test (for switches with mild corrosion resistance); temperature rise test;
Switching capacity test;
Life test;
Rated fuse short-circuit current test;
Housing protection performance certification;
Low temperature test;
Chemical gas corrosion test (only for switches with moderate corrosion resistance and severe corrosion resistance); explosion-proof performance test;
Housing and housing parts impact test;bzxz.net
Rubber material aging performance test.
6.1.3 The switches used for type test must be formal samples with complete main manufacturing process equipment, and each test item of each test and sub-test should be no less than 2 sets. The switch can only be considered qualified for the type test if all tests and sub-test items have passed and all tested samples have passed. Otherwise, the cause must be analyzed and technical measures must be taken to improve the design process, tooling, etc., and re-produce until the type test is qualified. Only samples that have passed the type test can be submitted for appraisal. 6.2 Periodic testing
6.2.1 Switches produced in batches and in large quantities should be tested regularly, once every five years. 6.2.2
Periodic test items:
All inspection items;
Moisture resistance and light corrosion resistance tests (only for switches that resist light corrosion); temperature rise test;
Switching capacity test;
Life test
Rated fuse short-circuit current test;
Chemical gas corrosion test (only for switches that resist medium corrosion and severe corrosion). 6.2.3 For switches that have been put into production, they must be randomly selected from batches of switches that have passed the factory inspection. Each test item should be no less than 2 units. All the specified test items can be passed and all test products are qualified before the tested switch can be considered to have passed the periodic test. If only one unit fails in one item during the test process, the item can be retested twice according to the sampling quantity. If all items are qualified in the double retest, the periodic test can be considered to have passed. If one unit still fails in one item, the periodic test can be considered to have failed. 5.3 Factory Inspection
6.3.1 Each switch must pass the inspection and be accompanied by a document proving the quality of the product before it can leave the factory. 6.3.2
Factory inspection items:
General inspection;
Appearance inspection;
Action performance inspection;
Isolation parameter inspection;
Static strength test (water pressure test) of the weak explosion shell of the flameproof switch; Dielectric energy test.
5.3.3Factory inspection-items must be carried out on each product shipped one by one. Unqualified products must be returned for repair one by one until they are fully qualified. If they cannot be restored, they should be scrapped.
7 Marking, packaging, transportation, storage
7.1 Marking
Each switch shipped out of the factory must have a nameplate in a conspicuous place on the shell, and the nameplate should indicate the following contents; a.
Manufacturer name or product trademark;
Product name and model:
Rated working voltage, rated working current; Anti-green mark
Explosion-proof certificate number:
Manufacturing date or number.
7.2 Packaging
7.2.1 The packaging requirements of the switch shall comply with the provisions of GB/T13384. 7. 2. 2
The technical documents carried with the product in the packaging are: product certificate;
Product instruction manual;
Packing list.
The outer wall of the packing box should be marked with clear words and signs, the contents are as follows: manufacturer name;
product name and model;
product quantity:
name and address of the consignee;
"electrical appliance", "handle with care", "afraid of moisture", "upward" and other words or marks; net weight and gross weight;
outer dimensions of the packing box, length × width × height mm. 7.3 Transportation and storage
7.3.1 The basic environment and test methods for the transportation and storage of switches shall comply with the provisions of JB3284. 7.3.2 During transportation and storage, measures should be taken to prevent rain and snow from invading the switches. 7.3.3 The switches should be stored in a warehouse with good air circulation, no dripping and liquid infiltration; the relative air humidity is not more than 90%; the temperature is not higher than 40℃ and not lower than -25℃.
7.3.4 The environment around the switch should not contain corrosive gases that damage the metal and its insulation. 25
Additional Notes:
JB6750-93
This standard was proposed and managed by Shenyang Electric Drive Research Institute. This standard was drafted by Changzheng Electric Factory No. 11. The main drafters of this standard are Zhao Yuchun, Ding Jun, Su Xirong, and Liu Wenping. Shenyang Electric Drive Research Institute is entrusted with the interpretation of this standard.
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