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MT/T 166-1987 English PDF

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MT/T 166-1987: (Mine intrinsically safe cable crimp connection, distribution box. General technical requirements)
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MT/T 166-1987English389 Add to Cart 3 days [Need to translate] (Mine intrinsically safe cable crimp connection, distribution box. General technical requirements)   MT/T 166-1987

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Basic data

Standard ID MT/T 166-1987 (MT/T166-1987)
Description (Translated English) (Mine intrinsically safe cable crimp connection, distribution box. General technical requirements)
Sector / Industry Coal Industry Standard (Recommended)
Classification of Chinese Standard K13
Date of Issue 11/18/1987
Date of Implementation 12/25/1987

MT/T 1:

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
(Mine intrinsically safe cable crimp connection, distribution box.General technical requirements) Ministry of Coal Industry Standards MT/T 166-87 Mine-used intrinsically safe crimped cable junction box General technical conditions Published on November 18, 1987 1987-12-25 Implementation Published by the Ministry of Coal Industry of the People's Republic of China

Contents

1 Technical requirements 1 2 Test method 4 3 Inspection rules 5 4 Marking, packaging, transportation and storage 7 Appendix A Specifications for Mine Intrinsically Safe Crimped Cable Junction and Junction Boxes (Reference) 8 Appendix B Mine Intrinsically Safe Crimped Cable Connections, Rated Voltage and Current Ratings of Junction Boxes (Reference) 9 Mine-used intrinsically safe crimped cable junction box General technical conditions This standard applies to intrinsically safe junction boxes and junction boxes (hereinafter referred to as junction boxes) connected by crimping methods in coal mines.

1 Technical requirements

1.1 The junction box must comply with this standard and GB 3836.4-83 "intrinsically safe circuits and electrical equipment for explosion-proof electrical equipment used in explosive environments" Prepare the relevant provisions of "i", and manufacture and inspect the drawings and technical documents approved according to the prescribed procedures, and obtain the explosion-proof certificate issued by the inspection unit. 1.2 Environmental conditions The junction box should be able to operate at an ambient temperature of -20 to 40 ° C and a monthly average maximum relative humidity of 95% (at 25 ° C). Work in environments exposed to water and explosive gas mixtures such as coal dust and gas. 1.3 Main electrical properties 1.3.1 The rated voltage and rated current shall comply with the regulations of GB 156-80 "Rated Voltage" and GB 762-80 "Rated Current of Electrical Equipment" And can refer to Appendix B of this standard. 1.3.2 Contact resistance. not more than 0.01Ω in the normal state; not more than 0.05Ω in the vibration and shock test; it should not be more than after the life test 0.02Ω. 1.3.3 The insulation resistance between adjacent contact pairs and between any contact pair and ground should not be less than 3000MΩ, and the insulation resistance after the humidity test is not low. At 100MΩ. 1.3.4 Adjacent contact pairs and the insulation between any contact pair and the shell should be able to withstand 2U 1000V (U is the sum of the two circuit voltages), but not Withstand voltage test below 1500V. 1.4 Appearance requirements 1.4.1 The surface of the junction box shell is blue, and the shell must be free from mechanical damage such as rust, burrs, cracks, bubbles, pinholes, and plastic parts. Deformation that affects product performance. 1.4.2 The number of signs, nameplates and contact numbers on the junction box should be clear, straight, and set securely. 1.4.3 The parts shall be fastened without looseness, the surface shall be smooth without burrs, and there shall be no signs of corrosion. 1.4.4 The plating of the plug-in should be fine-grained, uniform and bright, and should not have defects such as burnt, blistering, peeling, dark spots, pits, and dark stripes. There is a lack of plating. 1.5 Structural requirements 1.5.1 Bolts (nails) for fastening and nuts should have anti-loosening devices. 1.5.2 Internal and external ground bolts should be provided, and the grounding symbol "" should be marked. The ground bolts should be rust-proofed by electroplating, etc. The diameter should be the same as the diameter of the wiring bolt; the size of the external ground bolt should not be less than M6. 1.5.3 The design of the size of the money box must be convenient for wiring, and there must be space suitable for the bending radius of the wire. Between the plug-in and the shell The electrical clearance and creepage distance between them shall not be less than those specified in Table 1. Table 1 No. Name Specification 1 Peak rated voltage *, V 60 90 190 375 550 2 Creepage distance, mm 3 4 8 10 15 3 Clearance, mm 3 4 6 6 6 Note. * The rated voltage peak refers to the sum of the highest peak voltages of the two circuits. 1.5.4 The socket body should have the core wire serial number. 1.5.5 Adopt loose-leaf cover or similar structure. 1.5.6 The parts of the same type, specification and variety of junction boxes shall be interchangeable. 1.6 Parts requirements 1.6.1 Fasteners Fasteners shall be anti-rust treated by electroplating or made of stainless materials. 1.6.2 Shell 1.6.2.1 Plastic enclosures shall be made of non-combustible or non-combustible materials, and their surface insulation resistance shall not be greater than 1 × 109Ω, and their thermal stability shall be Pass the test specified in 2.14.3 of this standard. 1.6.2.2 The light alloy casing shall be made of light alloy with a tensile strength of not less than 120 N/mm2 and a magnesium content of not more than 0.5% (weight ratio). 1.6.2.3 Shells made of cast iron, light alloy, plastic or other metal materials with a thickness of less than 3mm shall be subject to paragraph 2.14.1 of this standard The prescribed impact test shall not cause deformation or damage that affects the protective performance. 1.6.2.4 It shall have the protection capability of GB 4942.2-85 "protection level of low-voltage electrical enclosures" IP54. 1.6.3 Plugin 1.6.3.1 The plug-in is made of copper alloy and the surface should be nickel-plated. 1.6.3.2 The plug-in must have sufficient separation force. In normal conditions, the separation force of one foot should be 5 ~ 30N. After the life test, it should not be less than 3N. 1.6.3.3 The connection between the insert and the wire shall be crimped. After the insert is crimped to the wire, it shall withstand the tension value specified in Table 2, and shall not slide or break. crack. The contact between the insert and the wire should be reliable, and there must be no mechanical damage such as cracks or breaks in the outer sheath of the wire. Table 2 Contact diameter mm Wire diameter mm Crimp end tension, N Silver-plated tin-copper wire, nickel-plated copper wire, high-strength copper alloy wire 1.5 1.5 204.1 167.8 1.0 81.6 86.2 1.5 or 1.0 1.0 81.6 59.0 204.1 0.6 31.8 27.2 81.6 1.5 or 0.8 0.8 45.4 36.3 77.1 0.5 18.1 13.6 45.4 0.6 0.5 20.4 12.7 45.3 0.3 6.8 6.8 0.8 or 0.6 0.4 10.9 7.7 24.9 1.6.4 Introduction device 1.6.4.1 The junction box shall adopt a compression nut (fig. 1) or a pressure disc (fig. 2) introduction device, and it shall have a protection against loosening and preventing the cable from being pulled out. Measures. 1- compression nut; 2-metal washer; 3-steel plug plate; 4-seal ring; 5-cable clamp; Figure 1 Compression nut type introduction device 1-cable clamp; 2-pressure plate; 3-metal washer; 4-steel plug plate; 5-seal ring; Figure 2 Platen introduction device 1.6.4.2 The cable entrance of the lead-in device shall be made into a bell mouth, its inner edge shall be smooth, there shall be no cracks (mouths), and it shall be provided with a nominal thickness Not less than 1mm steel block plate. 1.6.4.3 For a nut-type introduction device, a metal washer must be installed between the nut and the sealing ring; the porous sealing ring or the contact area is small Single-hole seals should be fitted with metal washers on both sides (see Figure 1). 1.6.4.4 The seal ring should be made of rubber with a Shore hardness of 45 to 55 degrees.The rubber material must be able to withstand the aging requirements specified in Article 2.15 of this standard. For the chemical test, the sealing ring shall be subjected to the clamping test specified in 2.10.1 of this standard. To fit cables with different outside diameters, cuts on the seals are allowed Cut concentric grooves. 1.6.4.5 The diameter of the hole diameter D0 of the seal ring and the outer diameter D of the seal ring shall not be greater than those specified in Table 3. Table 3 mm D D2-D D < 20 1.0 20 \u003cD\u003c60 1.5 D > 60 2.0 1.6.4.6 A lead-in device with a crimping fixture shall be subjected to the cable clamping test specified in this item. The length of the sample cable is 300 mm. Endure. a. A cable clamp strength test that is bent at 90 ° in each of the four directions at the root of the cable; b. Cable rotation resistance test of the cable clamp for one rotation of the cable; c. Cable resistance test of cable clamped by.200N cable tension; d. Cable torsion resistance test of cable clamp with 360 ° free end rotation. After the test, neither the cable clamp nor the cable should be damaged, and the cable should have no displacement. 1.7 When all contact pairs of the series junction box pass 125% rated current, the stable temperature rise of the connection part does not exceed 30 ° C. 1.8 Life requirements It can withstand 500 connections and disconnections when there is no electrical load, and ensure contact resistance and separation force in accordance with the requirements of this standard. Visibly peeling. 1.9 The junction box is continuously placed for 16 hours at an ambient temperature of 70 ° C. The appearance, insulation resistance and electrical strength should meet the requirements of this standard. 1.10 When the terminal box is supplied, the manufacturer must provide a crimping tool. 1.11 Under the conditions of observing the storage and use rules stipulated in the product standards, the user will be responsible for product quality problems within one year from the date of shipment from the manufacturer. In the event of damage or failure to work properly, the manufacturer shall repair or replace the user for free.

2 Test method

2.1 Test conditions In this standard, all tests except climate and environmental tests are performed under the following atmospheric conditions. Ambient temperature. 15 ~ 35 ℃ Relative humidity. 45% ~ 75% Atmospheric pressure. 86 ~ 106kPa 2.2 Visual inspection is in accordance with GB 5095.2-86 "Basic test procedures and measurement methods for electromechanical components for electronic equipment. Part 2. General inspection Inspection, electrical continuity, contact resistance test, insulation test and electrical stress test are carried out as specified in Chapter 1. 2.3 Structural dimension inspection shall be carried out in accordance with the relevant provisions of Chapter 2 of GB 5095.2. 2.4 The contact resistance test is carried out in accordance with the provisions of Chapter 3 of GB 5095.2. 2.5 Insulation resistance measurement shall be carried out according to the provisions of Method A of Chapter 11 of GB 5095.2. 2.6 The electric strength test shall be carried out according to the method in Chapter 12 of GB 5095.2. 2.7 Inspection of single-leg separation force is in accordance with GB 5095.8-86 "Basic test procedures and measurement methods for electromechanical components for electronic equipment. Part VIII. Mechanical tests on connector contacts and terminations are carried out in accordance with the provisions of Chapter 12, Method A. 2.8 The tensile strength test of the crimp end shall be carried out in accordance with Chapter 11 of GB 5095.8. 2.9 Temperature rise test according to GB 5095.3-86 "Basic test procedures and measurement methods for electromechanical components for electronic equipment. Part III. Current carrying capacity The test is carried out in accordance with Chapter 1. 2.10 Cable clamping test 2.10.1 The clamping test of the sealing ring type lead-in device is in accordance with GB 3836.1-83 "General Requirements for Explosion-proof Electrical Equipment for Explosive Environments" No. 27 The provisions of the Chapter. 2.10.2 Clamping test with lead-in fixture introduction device. 2.10.2.1 The strength test of cable clamps is in accordance with GB 5095.9-86 "Basic Test Procedures and Measurement Methods for Electromechanical Components for Electronic Equipment" Points. Cable clamping test, explosion hazard test, chemical resistance test, fire hazard test, radio frequency resistance test, capacitance test, shielding With the filter test, magnetic interference test "Chapter 1". 2.10.2.2 The resistance of the cable clamp to cable rotation is tested in accordance with the provisions of Chapter 2 of GB 5095.9. 2.10.2.3 The test of the cable clamp's ability to withstand the tensile force of the cable is carried out in accordance with the provisions of Chapter 3 of GB 5095.9. 2.10.2.4 The cable clamp resistance to cable torsion is tested in accordance with GB 5095.9 Chapter 4. 2.11 The protection ability test is carried out according to the test method of IP54 in GB 4942.2. 2.12 Mechanical life test according to GB 5095.5-86 "Basic test procedures and measurement methods for electromechanical components for electronic equipment. Part 5. Impact The impact test (free element), static load test (fixed element), life test and overload test are carried out according to Chapter 6. 2.13 For interchangeability test, use mating components that can be matched for connection inspection or standard inspection samples. 2.14 Shell test 2.14.1 The shell impact test shall be conducted in accordance with the provisions of Article 21.1 of GB 3836.1. 2.14.2 The surface insulation resistance of plastic casings is in accordance with GB 1410-78, "Insulation resistance, volume resistance and surface resistance system of solid electrical insulation materials" The number of test methods "is used to measure the plate-shaped test piece, and the diameter of the measuring electrode is 50 ± 0.1mm. 2.14.3 The thermal stability test of the plastic case shall be carried out in accordance with the provisions of Article 24.2 of GB 3836.1. 2.15 Seal ring aging test shall be carried out in accordance with the provisions of Chapter 29 of GB 3836.1. 2.16 Climate and environmental test 2.16.1 High temperature test according to GB 5095.6-86 "Basic test procedures and measurement methods for electromechanical components for electronic equipment Part 6. Climate The test and solderability test are carried out in accordance with Chapter 9. The high temperature is 70 ℃, and the plug-in is tested for 16 hours in the plug state. Standard atmosphere after test Return to room temperature under conditions, and immediately check the appearance, insulation resistance and electrical strength, which shall meet the requirements of Article 1.4, 1.3.3 and 1.3.4 Regulations. 2.16.2 The low temperature test shall be carried out in accordance with the provisions of Chapter 10 of GB 5095.6. The temperature was -40 ℃, and the plug-in was tested in the plug-in state for 16h. test After taking it out, check the appearance and insulation resistance, which shall meet the requirements of Article 1.4 and 1.3.3 of this standard. 2.16.3 Moisture test is in accordance with GB 2423.4-81 "Basic Environmental Test Procedure Test for Electrical and Electronic Products Db. Alternating Humidity Test Method" Regulations. The high temperature is 40 ℃, and the plug-in is tested for 12 cycles in the plugged state. Check the insulation during the low temperature and high humidity phase of the last cycle The resistance and electrical strength shall comply with the provisions of paragraphs 1.3.3 and 1.3.4 of this standard. Visual inspection immediately after the test shall comply with this standard Article 1.4. 2.16.4 Vibration test in accordance with GB 5095.4-86 "Basic test procedures and measurement methods for electromechanical components for electronic equipment Part 4. Dynamic The stress test is carried out according to Chapter 4. The test frequency is 10 ~ 55Hz, and the acceleration is 10g. The samples are sequentially on three mutually perpendicular axes. Shake for 45min. Changes in contact resistance measured during vibration in accordance with the provisions of Chapter 5 of GB 5095.2 shall comply with the provisions of paragraph 1.3.2 of this standard. set. Check the appearance after the test, and it should meet the requirements of Article 1.4 of this standard. 2.16.5 The impact test shall be carried out in accordance with the provisions of Chapter 3 of GB 5095.4, with a peak acceleration of 30g and a pulse duration of 18ms. Three mutually perpendicular axes struck three consecutive times in each direction (18 times in total). Measure the impact during impact in accordance with the provisions of Chapter 5 of GB 5095.2 The change in the contact resistance shall be in accordance with the provisions of paragraph 1.3.2 of this standard. Check the appearance after the test, and it should meet the requirements of Article 1.4 of this standard.

3 Inspection rules

3.1 The product must pass the prescribed factory test and type test during the shaping and production process. 3.2 Factory test 3.2.1 The factory test is carried out by the quality inspection department of the manufacturing unit. 3.2.2 Each product must be visually inspected. 3.2.3 Except for visual inspection, other tests shall be carried out from the submitted batch of products in accordance with GB 2828-87 "Sampling procedures and sampling procedures Table (applicable to continuous batches of inspections) "in the general inspection level 1 sampling plan random samples. The test items are in accordance with the specifications in Table 4. Scheduled. Table 4 Test Item Requirements Test Method Qualified quality level AQL,%

1 Structure size

1.5.2 1.5.3 2.3 2.5 2 Interchangeability 1.5.6 2.13 3 One foot separation force 1.6.3.2 2.7 1.5 4 Contact resistance 1.3.2 2.4 5 Insulation resistance (normal state) 1.3.3 2.5 6 Electric strength (normal state) 1.3.4 2.6 3.2.4 If the number of unqualified products is less than or equal to the qualified judgment number, the batch of products is judged as qualified. If the number of nonconforming items is greater than or equal to the nonconforming item If the number of cases is determined, the factory test fails. Re-test the unqualified batches before re-inspection. Strict inspection should be carried out during re-inspection If it fails, the batch of products is judged to be unqualified. 3.3 Type test 3.3.1 In any of the following cases, the product shall be type tested. Products that have not passed the type test shall not be put into mass production. a. Trial production of new products; b. When the product has major changes in design, technology, and materials; c. When the product that has been discontinued for one year is re-produced; d. products produced in batches are performed at least once a year; e. When deemed necessary by the inspection unit. 3.3.2 The type test must be carried out by the inspection unit designated by the state. 3.3.3 It must be selected from the currently produced products that have passed the factory test according to GB 2829-87 "Sampling procedures and Sample table (applicable to the inspection of the stability of the production process) "one-time sampling plan at the discrimination level III, randomly selected 5 samples. 3.3.4 All samples should be inspected according to the factory test items first. If there are non-conforming products, they should be exchanged for qualified products before being typed. test. 3.3.5 Type tests are carried out according to the items specified in Table 5. table 5 Test Item Requirements Test Method Substandard quality level RQL,% 1 Temperature rise 1.7 2.9 2 Tensile strength of crimp end 1.6.3.3 2.8 3 Sealing ring aging 1.6.4.4 2.15 4 Shell impact 1.6.2.3 2.14.1 5 Thermal stability of plastic case 1.6.2.1 2.14.3 6 Protection capacity 1.6.2.4 2.11 7 Surface insulation resistance 1.6.2.1 2.14.2 8 Life 1.8 2.12 9 Insertion device clamping 1.6.4.4 2.10.1 10 Cable clamp strength 1.6.4.6a.2.10.2.1 11 Cable clamp resistance to cable rotation capacity 1.6.4.6b.2.10.2.2 12 Cable clamp resistance to cable pull capacity 1.6.4.6c.2.10.2.3 13 Cable clamp resistance to cable torsion 1.6.4.6d.2.10.2.4 14 High temperature 1.9 2.16.1 15 Low temperature 1.2, 1.4, 1.3.3 2.16.2 16 Humid 1.2, 1.3.3, 1.3.4, 1.4 2.16.3 17 Vibration 1.2, 1.3.2, 1.4 2.16.4 18 Shock 1.2, 1.3.2, 1.4 2.16.5 The judgment value is [01]. 3.3.6 If a sample fails, the type test fails. The batch of products should stop acceptance. At the same time, the cause should be analyzed and measures taken. Eliminate defects and resume acceptance until the new type test is qualified. 4 Marking, packaging, transportation and storage 4.1 Signs 4.1.1 A clear permanent mark "Ex" shall be provided at the obvious place of the junction box shell. 4.1.2 The nameplate of the junction box housing is obvious, and it must be provided with a nameplate and fixed reliably. Nameplate must be made of bronze, brass, stainless steel, and its thickness should not be small At 0.5mm. The nameplate must include the following. a. Product model and name; b. There are obvious signs "Ex" in the upper right; c. Explosion-proof type, and indicate the category, level, temperature group and other signs in sequence; d. Explosion-proof certificate number; e. Rated voltage and rated current; f. manufacturer name, date of manufacture and product number; g. Product standard number. 4.2 Packaging 4.2.1 The finished product is wrapped in plastic or moisture-proof material and placed in a cardboard box with a certificate of compliance. 4.2.2 The packing box should be packed in a dry, moisture-proof wooden box, and stuffed tightly with no filling. A packing list and instructions for use should be attached to the box Mingshu. 4.2.3 The packing list, packaging box and the appearance of the packaging box shall indicate the product name, model, quantity, and manufacturer's name (or trademark). Number), date, check stamp, etc. Product packaging marks shall comply with the provisions of GB 191-81 "Packaging, Storage and Transportation Instruction Marks". 4.3 Transportation Packaged into a junction box, it can be transported by any tool under the condition of avoiding direct rain and snow. 4.4 Storage The junction box packaged into a box should be stored at a temperature of -20 to 40 ° C and a relative humidity of not more than 80%. Inside the warehouse of corrosive gas. From the date of acceptance, the storage period is 1 year. During the storage period, the product should meet the requirements of this standard.

Appendix A

Mine Intrinsically Safe Crimped Cable Junction and Distribution Box Specifications (Reference) Wiring capacity (logarithm) Introduction device (number) Big middle small twenty two twenty two

Appendix B

Mine intrinsically safe crimp type cable connection, junction box rated voltage, rated current level (Reference) Rated voltage, V AC DC Rated current, A U≤24 U≤60 U≤42 U≤100 U≤110 U≤127 U≤220 I≤3.15 Additional information. This standard was proposed by the Technology Development Department of the Ministry of Coal Industry of the People's Republic of China. This standard was drafted by the Changzhou Institute of Automation of the Coal Science Research Institute, with the participation of 855 Factory of the Ministry of Electronics Industry. The main drafters of this standard are Shen Shizhuang, Peng Xia, and Yuan Shenghua. This standard is entrusted to the Changzhou Institute of Automation of the Coal Research Institute for interpretation.

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