This standard applies to increased safety low-voltage cable junction boxes for coal mines (hereinafter referred to as junction boxes). MT/T 945-2005 Increased safety low-voltage cable junction boxes for coal mines MT/T945-2005 Standard download decompression password: www.bzxz.net

KX 73. 1c0.99
Vertical case number: 15514—2005
Coal Industry Standard of the People's Republic of China
MT/T945—2005
Increased safety low-voltage cables connecting box for coal mine2005-02-14 Issued by National Development and Reform Commission 2005-06-01 Implementation Normative documents Classification and designation Test methods Inspection rules Marking, packaging, etc. Transportation and storage MT/T945-2005 MT/T945-2005 This standard was proposed by the Science and Technology Development Department of China Coal Industry Association and formally approved by the Coal Industry Drying and Expansion Special Equipment Standardization Technical Committee. This standard was drafted by the Shanghai Branch of the China Coal Research Institute and the Fushun Branch of the China Coal Research Institute. The main authors of this standard are Liu Gengshe, Wang Qikun and An Shutong. Scope
Increased safety low-voltage cable junction box for coal mines
MT/T945—2005
This standard specifies the classification and designation, requirements, test methods, inspection rules, marking, packaging, transportation and storage of increased safety low-voltage cables for coal mines.
This standard applies to increased safety low-voltage cable junction boxes for coal mines (hereinafter referred to as junction boxes). 2 Normative references
The clauses in the following documents are considered as clauses of this standard through reference in this standard. For any dated reference, all subsequent revisions (excluding errata) or revised versions are not applicable to this standard, but the parties that have reached an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For undated referenced documents, the latest version shall apply to this standard. GBT1912000 Pictorial symbol for packaging, storage and transportation (GBT1S0780:1997) B/T2422.4-1553 Basic environmental test procedures for electric and electronic outputs; Cyclic damp heat test method (EC58-2-35,196c) G3836.1-209 Electrical equipment for explosive gas atmospheres - Part 1 - General requirements EC60C79-0:1998 GB283 6.3—2000 Electrical equipment for explosive gas atmospheres Part 3: Port safety type” (IEC60079-7: 1990) GB/T4942.2—1993 Protection levels of low voltage electrical appliances (IEC047-115B) GB/T14048.1—2000 General standard for low voltage switchgear and control equipment (IEC6C947-1: 1999) MT/14.2—19S6 Classification and naming of product models and notification methods for electrical equipment for coal mines
3. 1 Type
The explosion type of the junction box is the increased safety type for coal mines (E). 3.2 Model and meaning
The preparation method of the product model shall comply with the provisions of MT/T 154.2-1S9G standard. The arrangement is shown in Figure 1. 3.3 Basic material numbers
3.3.1 Rated voltage value: AC 36.127.220.380,660.1140V DC 24,36,11C,22V, 3.3.2 Rated current value, 2563.265,200250315400A. 3.3.3 Duty cycle; 50 Hz.,
3.3.4 The protection level of the shell should not be lower than 1P54 specified in GB/T4942.2-1993, 3.3.5 The receiving box is made of long-term T.
The difference between the individual models (or temperature)
The voltage must be sufficient, the maximum value is V
Standard: A
Size (with a comparison)
Steamed Eggs
National 1 Product Model Terminal Arrangement
MT/T 9452005
4 Requirements
The transformer box should be manufactured in accordance with the prescribed procedures and the medical knowledge and technical documents reviewed by the national authorized quality supervision and inspection department. 4.1
4.2 The protection index and media protection test of the transformer box should meet the requirements of H383.1-2 (100 and GB3836.1-200C) 4.3 The transformer box should be able to work normally under full load:
The installation temperature is 2000ms
The ambient temperature is ~
The surrounding space The average relative humidity of the air is not too dry (10:20): In the environment without destructive gas or severe environment, in the environment without strong vibration and other impact: In the parking lot, the total air duct or soil inlet, the cage period room, the air inlet of the mine card, the pollution level is level 1!
h) Installation type steel, III
4.4 The electrical clearances between the conductive parts in different positions in the junction box, the conductive parts and the external, and the grounding body shall meet the requirements of 4.3 and 1.4 in B3836.3-2UU, 4.5 According to the different rated insulation voltage of the line, the resistance value shall meet the requirements of Table 1, the technical line box shall meet the requirements of Table 2, and the test shall be conducted for 5 hours! There shall be no flashover phenomenon. 6
The line-supported alternating current test shall comply with the provisions of GB1836.12000 Annex C: The test temperature shall be 17
-10, and the test period shall be 6. After the test, the requirements of 4.54.3 shall be met, and the outer coating of the metal shall not show serious shedding and corrosion. 4.8 The protection level of the outer shell of the connection box shall not be lower than that of 1P54 specified in G3/TS43.2993. The connection parts in the connection box shall meet the requirements of GB3835.520004.1, and shall also be subjected to the torsion test 4.9
Table! Continuous resistance value
definite absolute resistance
0
relative resistance 50%73%
Note: the written data can be used as the test data after type inspection and maintenance, and is not a standard for type inspection; Note 2: The test piece is used as a reference for determining whether it is qualified or not. Table 2 Power frequency withstand voltage test voltage value
definite voltage! ! ,
900-200
4.10 The resistance rise of the connecting parts in the connection point shall not exceed the value specified in Table 3. 2
1 Voltage test value (sexual value)
According to the material specification
Oil specification
Replacement
And (or its body
Other metal expansion
Table 3 Temperature rise of terminal blocks
MF/T945-2505
The outer shell and components of the junction box shall be tested according to the provisions of 23.1.1.1 in GB3880.1-2000. After the test, there shall be no damage to the equipment according to the type of protection. 4.12
The electrical installation of the junction box shall comply with the provisions of Appendix D in GB3835.:2700, 4, 13
Standard sealing materials should be subjected to the aging test specified in CB3836.1-2000. Non-metallic components of the outer casing and outer casing should comply with the provisions of Chapter 7 of GH3336.1-2000. 4.14
The maximum power consumption of the charger or charger box should comply with the provisions of GB835.3-200045.7. 4.15
The inspection of the connection box should also comply with the provisions of 4.10 of GB3835.3-2393. The wiring should be connected to the grounding connector according to the requirements of 3835.1-2000 Section 5. The wiring box should be black and the parts should be blue. The color of the wiring box should be distinguished according to the rated voltage, 1140 V color, equal to or less than the inner surface of the metal without blood should be coated with strong source. 5 Test method
5.1 Power frequency withstand voltage test is carried out according to the provisions of /14C48.1-20W 6.3.3.4. 52 Humidity test is carried out according to the provisions of GB/14942.2993. 5.3 External expansion test is carried out according to the provisions of GB/14942.2993. 5.4 Connector rotation test is carried out according to the provisions of 23.4.3 of G133335.12000. 5.5 Root opening test is carried out according to the provisions of C5/T14℃48.1-2035 8.3.3,2. 5.6 External bright impact test is carried out according to the provisions of 23.3.1 of GH3335.1-200%). 5.7
The clamping test of the inlet device shall be carried out according to the small appendix of 383G.1-200. 5.8 The aging test of the sealing material shall be carried out according to the requirement D of B3836.1-2000. The thermal conductivity test shall be carried out according to the provisions of 23.4.5.1 of B3833.1-2000.9
The surface resistance test of the whole shell parts shall be carried out in accordance with the provisions of 3.4.7.8 of 6B3836.1-2UWU. Measure the insulation resistance between the terminals and the terminals. Use a 4V megohmmeter EV Xing S.11
The combustion energy test of the plastic shell shall be carried out in accordance with the provisions of Appendix II of GB5836.12000. 12
The chemical test of the plastic shell shall be carried out in accordance with the provisions of 3835.1-2000. 5.13
The maximum allowable power consumption rate of the wire box shall be in accordance with E.7 of GB3836.32. 14
, 15 The inspection of the original, electrical isolation, fastening, grounding, depth and instrument matching quality of the electrical room shall be carried out according to G333.1-0A H383E.3-200C, product drawings and installation documents. E Inspection Specifications
Inspection Classification
MT/T945-2005
Inspection of junction boxes is divided into factory inspection and type inspection. 6.2 Factory Inspection
6.2.1 The factory inspection items are shown in Table 4.
6.2. 2. Factory inspection items The junction box can only be recognized as qualified after passing the inspection. 6.2.3 The quality control inspection of the factory shall be carried out on each of the junction boxes of the model to be inspected and the qualified products shall be put into production.
6.3 Type inspection
When any of the following situations occurs, type inspection shall be carried out; new products or old products transferred to the factory for production shall be adjusted: b) After formal production, if there are major changes in structure, model and process, which may affect product performance; Normal production The selection is conducted every 5 years. After the product is discontinued for 2 years, when it is resumed, the quality supervision agency shall issue a request. The type inspection items are shown in Table 4. The products used for type inspection are randomly selected from the products that have been inspected before leaving the factory, and the number of finished products is not less than 2 sets. All items of the type inspection report meet the requirements of this standard. The type inspection items are shown in the figure. The inspection and supervision items are inspected and inspected. Humidity and heat
Outflow protection
Connection
Heat micro-setting
Surface insulation resistance
No connection
Explosion-proof device
Chemical resistance
Full flame extinguishing efficiency
Electrical department electric room
Welding structure and appearance
Allowance:/Instructions for items that need to be purchased, × indicates items that need to be inspected and rectified, Shipping and storage
Technical requirements
4 17~.4, 8n
Out of the market
7.1 The obvious part of the cable drum shell should have a permanent convex or concave mark "on the top" and be marked in red. 7.2 The outer surface of the junction box should be marked with the product code "MA", which can be reliable. 7.3 A lead plate should be set on the obvious part of the junction box shell and can be fixed: The following contents should be clearly noted: 4
Product number and name:
Anti-drying type\E.xe1\+
Rated voltage and rated current:
Protection level;
Permissible power consumption,
Certificate number;
Safety mark number of mining products!
h) Date of manufacture or serial number:
Manufacturer name
7.1 The label shall be made of copper or stainless steel.
The color of the wiring box shall be able to prevent damage during transportation and take appropriate measures. 7.5
5 The outer packaging of the wiring board shall have obvious markings, and the following items shall be included inside: 7.6
Manufacturer name and labeling:
Product model and name
The size and gross weight of the packaging box,
Delivery receipt and address;
MT/T 945—2005
Product quantity;
Comply with the provisions of GB/TIS1-2U03, add "handle with care", "be careful" "packing year and month" and other signs or words, f
7.7 The following documents and tools supplied with the product are packed into the packing box together: a)
Packaging list
b) Product certificate
c) Product instruction manual:
d) Special tools.
7.8 The packaging box should not be exposed to the wall and vibration during transportation, and should be protected from rain and snow. The copy disk should be stored in a warehouse with good air circulation without the intrusion of useless snow. 7.96bzxz.net
Manufacturer's name and label:
Product model and name
The size and gross weight of the packing box,
Delivery receipt and address;
MT/T 945-2005
Product quantity;
Comply with the provisions of GB/TIS1-2U03, add "handle with care", "be careful", "date and month of packing", etc. marks or words,
7.7 The following documents and tools supplied with the product shall be packed together in the packing box: a)
Packing list
b)Product certificate
c)Product instruction manual:
d)Special tool.
7.8The packing box shall not be exposed to the wall or vibration during transportation, and shall be protected from rain and snow. The disk shall be stored in a warehouse with good air circulation and no intrusion of snow.7.96
Manufacturer's name and label:
Product model and name
The size and gross weight of the packing box,
Delivery receipt and address;
MT/T 945-2005
Product quantity;
Comply with the provisions of GB/TIS1-2U03, add "handle with care", "be careful", "date and month of packing", etc. marks or words,
7.7 The following documents and tools supplied with the product shall be packed together in the packing box: a)
Packing list
b)Product certificate
c)Product instruction manual:
d)Special tool.
7.8The packing box shall not be exposed to the wall or vibration during transportation, and shall be protected from rain and snow. The disk shall be stored in a warehouse with good air circulation and no intrusion of snow.7.9
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