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Machinery Industry Standard of the People's Republic of China
JB/T570-1998
Explosion-proof Control Button
Published on May 28, 1998
Ministry of Machinery Industry of the People's Republic of China
Implemented on November 1, 1998
JB/T570'1998
Compared with JB570-85, the technical content of this standard has revised the explosion-proof safety performance, temperature rise of electrical appliances, dielectric properties, anti-cancer corrosion performance, dust and water resistance performance of the shell, insulation resistance value, etc. This standard will be automatically invalidated from the date of publication. This standard was proposed and managed by Shenyang Electric Drive Research Institute. This standard was drafted by Xuzhou Explosion-proof Electrical Appliance Factory. Participating drafting units of this standard: Suzhou Coal Mine Electrical Appliance Factory, Shenyang Hongxing Explosion-proof Electrical Appliance Factory, Datong Explosion-proof Electrical Appliance Factory, Zhejiang Delixi Group Huaxia Explosion-proof Electrical Appliance Industrial Company.
The main drafters of this standard are Zhang Jizhong, Yi Zhaodebi, Di Hongyan, Tian Yongfeng, and Xue Zhenggen. This standard was first issued in 1985 and revised for the first time in July 1996. Shenyang Electric Drive Research Institute is entrusted with the interpretation of this standard. 1 Scope
Mechanical Industry Standard of the People's Republic of China
Explosion-proof Control Buttons
JB/T 570 -1998
Replaces JB570-85
This standard specifies the classification, requirements, sampling, test methods, marking, packaging, transportation and storage of explosion-proof control buttons (hereinafter referred to as buttons).
This standard applies to the design, manufacture and inspection of buttons. Buttons are mainly used in hazardous places with explosive gas environments and mixtures. Control electromagnetic starters, contactors, circuit breakers and other electrical circuits
Cited Standards
The texts contained in the following standards constitute the provisions of this standard through reference in this standard. When the standard is published, the versions shown are valid. All standards will be revised. Parties using this standard should consider the possibility of using the latest versions of the following standards. GB/T2423.4-—93
GB3836.1—83
GB3836.2—83
GB 3836.3-83
GB3836.6—87
GB 4942.293
GB/T14048.1-93
GB/T14048.5--93
JB4002—92
JB426292
3 Product classification
3.1 Types of buttons
3.1.1 According to the place of use:
a) for coal mines;
b) for factories.
3.1.2 According to the explosion-proof type:
a) Flameproof type;
Basic environmental testing procedures for electric and electronic products (eqvIEC 68--2-30:1980)
Explosion-proof electrical equipment for explosive atmospheres
Explosion-proof electrical equipment for explosive atmospheres
Explosion-proof electrical equipment for explosive atmospheres
Test Db: Cyclic damp heat test method
General requirements (neqIEC79-0:1983)
Flameproof electrical equipment "d\ (neqIEC79-1) Increased safety electrical equipment ""
Oil-filled electrical equipment "o(negI EC796) Protection grade of low-voltage electrical enclosure (eqvIEC947-1:1988) Low-voltage switchgear and controlgear
Low-voltage switchgear and controlgear
General principles (eqvIEC947-1:1988)
Control circuit and switching elements
Circuit electrical appliances (eqvIEC947-5-1)
Terminal blocks for flameproof low-voltage electrical appliances for mining Rubber-sheathed cable entry devices for explosion-proof electrical appliances
b) Oil-filled type (limited to factory AC lines); c) Composite type.
3.1.3 According to the number of buttons:
Approved by the Ministry of Machinery Industry on May 28, 1998
Part I
Electromechanical control
Implemented on November 1, 1998
a) Single button:
b) Double buttons;
c) Three buttons;
d) Multiple buttons.
3.1.4 According to the operation mode:
a) Push button;
b) Pull button;
c) Push-pull button.
3.1.5 Other forms:
a) Indicator light type;
b) Instrument type;
c) Lock type;
d) Protective type;
e) Switch type.
Use categoryWww.bzxZ.net
The use category and code of the button are shown in Table 1.
JB/T570-1998
Use category
AC—12
AC—14
AC—15
DC—12
Control resistive load and solid-state load with photoelectric coupling isolation Control solid-state load with transformer isolation Control small-capacity AC electromagnet load ≥72VA) Control AC electromagnet load (<72VA)
Control resistive load and photoelectric coupling isolated graph load Control DC electromagnet
Control DC electromagnet with economic resistance in the circuit The push button shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved by the national designated testing unit. 4.1
4.2 The technical performance of the components of the button (such as button components, indicator lights, instruments, etc.) shall comply with the provisions of their respective product standards in addition to the provisions of this standard.
4.3 Normal working conditions
a) Altitude not exceeding 2000m;
b) The upper limit of ambient air temperature is +40℃, the lower limit is -5℃ for Class 1, and -20℃ for Class 1; c) The relative humidity of the air at the installation site is not more than 95% (at +25℃); d) In an environment of Class I and Class I with explosive gas mixtures; e) An environment without significant shaking and severe impact and vibration; f) A place that can prevent dripping water and other fluids from immersing; g) The installation inclination is not more than 5° from the vertical. 4.4 The insulation performance of the button should be able to withstand the power frequency withstand voltage test value specified in Table 2 of AC 50Hz, and there should be no breakdown or flashover for 1 minute. 2
Rated insulation voltage
U≤60
60It should comply with the provisions of Chapter 5 and 6 of GB3836.3-83. The main cavity should comply with the provisions of Article 7.1.3 of GB/T14048.193. When the button is passed through the agreed heating current (this value is specified by the product technical conditions), the temperature rise limit of the terminal connected to the external insulated wire and the temperature rise limit of the accessible parts shall not exceed the provisions of Table 3 and Table 4. The temperature rise limit of other parts (such as: the internal wire connection of the contact product, etc.) shall be specified separately by the product technical conditions. The maximum limit temperature of the shell surface shall comply with the provisions of Chapter 4 of GB3836.1-83. Table 3
Terminal material
Bare brass
Copper (or brass) tin-plated
Copper (or brass) silver-plated or nickel-plated
Other metals
Terminal rise 70K is determined based on the cable. The temperature rise limit is determined based on usage experience and life tests, but does not exceed 65K. Table 4
Accessible parts
Metal
Non-metal
The on-off capacity of buttons under abnormal use conditions shall comply with the provisions of Table 5. 4.8
AC-12 and DC-12 shall be specified separately in the product technical conditions. Table 5
Use category
AC-13
AC--14
AC--15
DC-13
DC-14
Rise limit
Temperature rise limit
Operation cycle
Number of operations per minute
Power-on time
Use category
Note: I-Rated working current:
PU., L,
P≥>50W
JB/T 570 -1998
Table 5 (end)
U.-rated working voltage;
1-making current or breaking current;
T. ≤6P upper limit is 300ms
The number of no-load operations (mechanical life) of the button under the condition that the main contact circuit is not flowing with current shall comply with the provisions of Table 6. Table 6
Number of operations per hour
Aircraft life
The electrical life of the button shall comply with the provisions of Table 7, and the number shall not be less than 20% of the mechanical life (10% for DC load), and the operating frequency shall comply with the provisions of 4.10
Table 6.
Current type
Use type The rated limiting short-circuit current of the push button should be 1.1 times the rated voltage of the test voltage, the power factor should be between 0.5 and 0.7, and the expected current of 1000A should be passed through the short-circuit circuit for three times, and the interval time should be not less than 3 minutes. After each short circuit, the button should be in good working condition. 4.12 The wiring terminals and lead-in devices of the push button should comply with the provisions of JB4002 and JB4262. The black metal parts of the button should have anti-rust measures. The impact resistance of the button shell (except for steel plate welding) or the shell parts should comply with the provisions of Article 21.1 of GB3836.1-83. The static strength of the flameproof button shell should comply with the provisions of Article 19.2.3 of GB3836.2-83. All threaded connections of the button must have measures to prevent self-loosening. The internal and external grounding requirements of the button should comply with the provisions of Chapter 15 of GB3836.1-83. The shell material of the button shall comply with the provisions of Chapter 7 and Chapter 8 of GB3836.1-83 and Chapter 3 of GB3836.2-83. The protection level of the outdoor button shell shall meet the requirements of IP54. Outdoor buttons should be painted with light-colored paint. When the button shell is a sealed structure, it should be padded with rubber pads. Oil-filled buttons should comply with the relevant provisions of GB3836.6. The indicator voltage, power and life of the indicator button shall be specified by the manufacturer in the product technical conditions. The shell cover of the flameproof button must be equipped with a warning sign for opening the cover after the power is turned off. Test method
The explosion-proof performance test (Article 4.1) shall be carried out by the national designated testing unit in accordance with the provisions of Chapter 31 of GB3836.1-83. JB/T 570 -1998
2 Inspection of appearance, assembly quality and grounding requirements (Articles 4.6, 4.12, 4.15, 4.16, 4.17, 4.20, 4.22, 4.24) shall be carried out in accordance with Article 9.1.3 of 5.2
GB/T14048.1-93, 5.3 The rated pressure test (Article 4.4) shall be carried out in accordance with Article 8.2.3.4.3 of GB/T1408.1-93. The damp heat test (Article 4.5) shall be carried out in accordance with the relevant provisions of GB/T2423.4. 5.4
5.5 The temperature rise test (Article 4.7) shall be carried out in accordance with Article 8.2.3.3 of GB/T14048.1-93. 5.6 The making and breaking capacity test (Article 4.8) shall be carried out in accordance with Article 8.2.3.5 of GB/T14048.5-93. 5.7 The life test (Article 4.10) shall be carried out in accordance with Article 8.2.3.7 of GB/T14048.1--93. Rated limiting short-circuit current test (Article 4.11) shall be carried out in accordance with Article 8.2.4 of GB/T14048.5-93. 5.8
The clamping effect, sealing performance, mechanical strength and anti-twist test of the lead-in device and the terminal (Article 4.12) shall be carried out in accordance with Chapter 27 of GB3836.1-83, Chapter 21 of GB3836.2-83 and Article 4.9 of JB4002-92 respectively. , 5.10
The impact test of the connector housing or housing parts (Article 4.14) shall be carried out in accordance with the provisions of Chapter 21 of GB3836.1-83, the water pressure test of the flameproof housing (Article 4.15) shall be carried out in accordance with the provisions of Appendix A of GB3836.2-83, 5.11
The thermal stability test and insulation resistance measurement of the plastic housing (Article 4.15) shall be carried out in accordance with the provisions of Article 24.2 and Chapter 25 of GB3836.1-83.
5.13 The protection capability test (Article 4.19) shall be carried out in accordance with the provisions of Article 7.2 of GB4942.2-93. 5.14
The aging test of rubber materials (Article 4.21) shall be carried out in accordance with the provisions of Chapter 29 of GB3836.1-83. Inspection rules
6.1 Classification of tests
a) Type inspection;
b) Factory inspection.
6.2 Type inspection
6.2.1 Buttons should be subjected to type inspection in one of the following situations: a) Before the development and production of new products or before the products are transferred to other factories for production; b) After formal production, when there are major changes in structure, materials, and processes that may affect product performance; c) When production is resumed after being suspended for 3 years.
6.2.2 Type inspection items
a) General inspection;
b) Power frequency withstand voltage test;
c) Damp heat test;
d) Temperature rise Tests;
e) Making and breaking capacity test;
f) Rated limiting short-circuit current test;
g) Mechanical life and electrical life test;
h) Sealing performance, clamping effect, mechanical strength test and connector torsion test of the introduction device; i) Plastic shell thermal stability test and insulation resistance measurement; k) Shell protection grade test;
i) Shell and transparent parts impact test;
m) Rubber aging test;
n) Explosion-proof performance test.
6.2.3 If the electrical life of the components selected for the button is equal to or higher than that of this standard and has been proved to meet the requirements of this standard, it is not necessary to repeat the type test of the button. 6.2.4 The button used for type test must be a button that meets the design requirements in terms of structure, manufacturing, materials, etc. The formal test items (the number of samples for each test is not less than 2) can pass and all the test samples are qualified before the button is considered to have passed the type test. Otherwise, the reasons must be analyzed and measures must be taken until the type test is qualified. 6.3 Factory inspection
6.3.1 Each button must be inspected and qualified, and accompanied by documents proving the quality of the product before it can leave the factory. 6.3.2 Factory inspection items
a) General inspection;
b) Appearance inspection;
c) Explosion-proof parameter inspection;
d) Static strength test (water pressure test);
e) Power frequency withstand voltage test,
7 Marking, packaging, transportation, storage
7.1 Marking
7.1.1 The button should be clearly marked with "Ex" on the shell cover. 7.1.2 The button should be fixed with a product nameplate with the following content in an appropriate and obvious position; a) manufacturer's name or trademark;
b) product model and name;
c) rated working voltage;
d) rated working current:
e) explosion-proof mark: indicate Ex, explosion-proof type and category mark in sequence; f) explosion-proof certificate number;
g) coal mine (factory) safety mark certificate (or production license) number; h) manufacturing year, month or batch number,
7.2 Packaging
7.2.1 The packaging must be protected from damage during transportation and should be rainproof and dustproof. The packaging box should have a packing list and the necessary transportation, installation, use, operation and maintenance instructions. 7.2.2 The outer packaging mark of the button should be clear and not blurred due to transportation or storage for a long time. The mark should include the following: a) manufacturer name (or) trademark; b) product model or serial number and name; c) product quantity; d) length, width, height, dimensions and gross weight of the packaging box; e) name and address of the consignee; f) words or marks such as "electrical appliance", "handle with care", "afraid of moisture", "upward", "packing year and month", etc. 7.3 The packaging box shall not be exposed to rain during transportation. The product should be placed in a warehouse without rain or snow, with good air circulation and relative humidity not exceeding 90% (at 20 ± 5℃), and temperature not higher than 1040℃ and not lower than -25℃. 6
People's Republic of China
Mechanical Industry Standard
Explosion-proof Control Button
JB/T 570 -1998
Published and issued by the Mechanical Science Research Institute
Printed by the Mechanical Science Research Institute
(No. 2 Shouti South Road, Beijing
Format 880×1230
Edition X, XX, 19XX
Printing 1-XXX
Postal Code 100044)
Sheet X/X
Number of words xXXx, xXX
Printing X, XX, 19XX
Price XXX.XX Yuan
XX-XXX
Mechanical Industry Standard Service Network: http://www.JB.ac.cn8661
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