Some standard content:
Coal Industry Standard of the People's Republic of China
MT376-1995
Technical Conditions for Blasting Busbar
Published on January 16, 1995
Ministry of Coal Industry of the People's Republic of China
Implemented on May 1, 1995
(Beijing) Xindengzi No. 023
Coal Industry Standard of the People's Republic of China
Technical Conditions for Blasting Busbar
MT376-1995
Published by China Standards Press
No. 16, Sanlihebei Street, Fuxingmenwai, Beijing
Postal Code: 100045
Tel: 8522112
Printed by Qinhuangdao Printing Factory of China Standards Press Distributed by Beijing Publishing House of Xinhua Bookstore Distributed in various places Sold by Xinhua Bookstore. Copyright reserved. No reproduction allowed. Format: 880×12301/16. First edition in June 1995. Printing sheet: 1/2. Word count: 12,000. First printing in June 1995. Print run: 1-1500. Book number: 155066·2-9899. Price: RMB 3.00. Heading: 264-59. Coal Industry Standard of the People's Republic of China. Technical Conditions for Blasting Busbar. 1 Subject Content and Scope of Application. MT376-1995. This standard specifies the technical requirements, test methods, inspection rules, marking, packaging and storage of blasting busbar. This standard It is applicable to single-core and double-core galvanized steel core PVC insulated blasting busbars (hereinafter referred to as busbars) for coal mine operations, and is also applicable to blasting busbars for other projects.
2 Reference standards
GB228 Metal tensile test method
GB3048.4 Test method for DC resistance of conductive core of wire and cable 3 Technical requirements
3.1 Basic requirements
3.1.1 The product shall comply with the provisions of this standard and shall be manufactured in accordance with technical documents approved by the prescribed procedures. 3.1.2 Purchased raw materials shall have a quality certificate and can only be used after passing the inspection. 3.2 Products
3.2.1 The nominal diameter (nominal overall dimensions) and limit deviation of the busbar shall comply with the provisions of Table 1. Table 1
2×7/0.52
Single wire diameter| |tt||Nominal diameter|Limit deviation
Conductive wire core diameter
Busbar diameter
Nominal diameter
Limit deviationNominal diameter
Limit deviation
When the temperature is 20℃, the DC resistance of the busbar shall meet the following requirements: The DC resistance of a single-core busbar shall not be greater than 0.09Q/m; the DC resistance of a single core of a double-core busbar shall not be greater than 0.09Q/m. 3.2.3 The busbar shall not produce breakdown after the water immersion withstand voltage test. 3.00
Busbar dimensions
Limit deviation
Nominal dimensions
6.50×3.00
3.2.4 The total breaking force of a single-core busbar wire shall not be less than 420N; the total breaking force of a double-core busbar wire shall not be less than 840N. 3.3 Conductive core
3.3.1 The nominal diameter and limit deviation of the conductive core shall comply with the provisions of Table 1. 3.3.2 The pitch of the conductive core shall not be greater than 30mm, and the twist shall be uniform and tight. 3.4 Conductive core monofilament
3.4.1 The nominal diameter and limit deviation of the conductive core monofilament shall comply with the provisions of Table 1. 3.4.2 The chemical composition of the conductive core monofilament material shall comply with the provisions of Table 2. Approved by the Ministry of Coal Industry of the People's Republic of China on January 16, 1995 ±0.20
Implemented on May 1, 1995
0.30~0.55
MT376-1995
The surface of the conductive core monofilament shall be galvanized. The zinc layer should be uniform and firm, and its technical performance should meet the following requirements: after the uniformity test, the zinc layer should not have firmly attached metal copper precipitated on its surface; after the firmness test, the zinc layer should not crack or fall off. 3.4.4 The tensile strength of the single wire of the conductive core should not be less than 295MPa. 3.4.5 The elongation at break of the single wire of the conductive core should not be less than 20%. 3.5 Insulation layer
3.5.1 The properties of the insulating material should meet the requirements of Table 3. Table 3
Tensile strength
Elongation at break
≥160
Thermal stability at 200℃
Volume resistivity at 20℃
≥1.0×101
Dielectric strength
3.5.2 The insulation layer should be free of impurities and should be tightly wrapped on the conductive core, easy to peel off without damaging the conductive core. Its surface should be smooth and uniform in color.
3.5.3 The thickness of the insulation layer should be uniform, and the thickness at the thinnest part should meet the following requirements: a.
The thickness of the thinnest part of the outer insulation layer of single-core and double-core busbars should not be less than 0.60mm; the thickness of the thinnest part of the insulation layer between the two cores of the double-core busbar should not be less than 1.20mm. 3.5.4 The color of the insulation layer is gray, red, yellow, blue, white and green, and can also be produced in colors other than this standard according to the agreement between the two parties. 4'Test method
4.1 Busbar appearance quality inspection
The appearance quality of the busbar is visually inspected.
4.2 Busbar diameter measurement
4.2.1 Instrument
a. Micrometer: measuring range 0~25mm, graduation value 0.01mm. b. Vernier caliper: measuring range 0~125mm, vernier reading value 0.02mm. 4.2.2 Test specimen
Take a test specimen of appropriate length at both ends of the bundle. 4.2.3 Measurement steps
4.2.3.1 Single-core busbar: Take any point in the middle of the test specimen, measure with a micrometer in two directions perpendicular to each other on the same cross section, and take the arithmetic mean as the average value of the diameter size. 4.2.3.2 Double-core busbar: Take any two points in the middle of the test specimen, measure with a vernier caliper in two directions perpendicular to each other on the same cross section, and take the arithmetic mean as the average value of the external dimensions. The contact pressure of the micrometer or vernier caliper should be reduced during measurement. 4.3 Determination of busbar DC resistance
Perform in accordance with GB3048.4.
When the measured ambient temperature does not meet the temperature specified in this standard, it should be corrected according to the following formula: R
R2o = 1 + a2o(t - 20)
Wherein: R20
-DC resistance value at 20℃, α/m;
MT376-1995
R,-actually measured DC resistance value at ambient temperature t, α/m; t-actual ambient temperature at the time of actual measurement, ℃; α20-resistance temperature coefficient of the metal material of the conductive wire core at 20℃, 1/℃ (0.00395 for copper core and 0.00455 for steel core). 4.4 Busbar immersion voltage withstand test
4.4.1, Instrument
High-voltage testing machine: test range 0~10kV, accuracy level 5.0. 4.4.2 Sample
Take a sample about 5m long at the outer end of the bundled wire. 4.4.3 Test conditions
4.4.3.1 Immerse the sample in water at a temperature of 20 ± 5℃ for 24h, with 200-250mm of both ends of the sample exposed above the water surface. 4.4.3.2 During the test, place the immersed sample in a 3% NaCl aqueous solution. 4.4.3.3 Apply 50Hz 5.0kV AC or 7.5kV DC between the conductive core of a single-core busbar and water or between the conductive cores of a double-core busbar in parallel and water.
4.4.4 Test steps
4.4.4.1 Connect the high voltage end of the high-voltage test machine to one end of the sample, and place the ground end in water. 4.4.4.2i
During the test, the voltage should start from a lower value, slowly and steadily rise to the specified test voltage value, and maintain it for 1 minute before observing the test results.
4.4.4.3 After the test, reduce the voltage to 40% of the specified test voltage value, and then cut off the power supply. 4.5 Measurement of the diameter of the conductive wire core
4.5.1 Instrument
Vernier caliper: Measuring range 0~125mm, vernier reading value 0.02mm. 4.5.2 Sample
Take a sample from each end of the bundle wire, about 300mm long. Remove the insulation layer at one end of the sample, about 50mm long. The conductive wire core should remain in its original state.
4.5.3 Measurement steps
Measure the diameter of the circumscribed circle on the middle section of the conductive wire core of the sample. 4.6 Measurement of the pitch of the conductive wire core
4.6.1 Instrument
Vernier caliper: Measuring range 0~125mm, vernier reading value 0.02mm. 4.6.2 Sample
Take a sample from the outer end of the bundle wire, about 300mm long. Remove the insulation layer, and the conductive wire core should remain in its original state. 4.6.3 Measurement steps
Measure the total length of three consecutive pitches on the sample, and 1/3 of the value is the pitch of the conductive core. 4.7 Conductive core zinc layer uniformity test
4.7.1 Sample
Take a sample of about 200mm in length from the outer end of the bundle, remove the insulation layer, and remove seven single wires. 4.7.2 Test conditions
4.7.2.1 Use copper sulfate (GB66588): chemically pure, prepare a solution with a density of 1.114~1.116g/cm24.7.2.2
Put the test solution in a container that does not react with copper sulfate. The solution height should not be less than 100mm, and the inner diameter of the container should not be less than 50mm.
4.7.2.3 In the above solution, no more than seven samples should be immersed each time, and the cumulative number of immersions should not be more than 20 times. 4.7.2.4 The temperature of the test solution is 18 ± 2°C. 3
4.7.3 Test steps
MT376-1995
4.7.3.1 Gently immerse the sample in the static test solution and start timing. The samples should not touch each other or the container wall. 4.7.3.2 When the immersion time reaches 45s, take out the sample steadily, wash it with water immediately, and wipe off the copper and its compounds attached to the zinc layer of the sample with absorbent cotton, and observe the surface of the sample. 4.8 Conductive wire core zinc layer firmness test
4.8.1 Equipment
The diameter of the test mandrel is 4.20mm and it should have sufficient hardness. Power winding is allowed, but it should comply with the winding speed specified in this standard.
4.8.2 Sample
Take a sample of about 300mm in length from the outer end of the bundle wire, remove the insulation layer, and remove seven single wires. 4.8.3 Test steps
Fix one end of the sample on the mandrel, hold the other end with your hand, slowly and tightly wind 8 to 10 turns on the mandrel at a speed of 15 turns per minute, and observe the surface of the sample.
4.9 Determination of tensile strength and elongation at break of conductive wire core 4.9.1 Instrument
Tensile testing machine: measuring range 0 to 500N, accuracy level 1.0. 4.9.2 Sample
Take a sample of appropriate length from the outer end of the bundle wire, remove the insulation layer, and remove seven single wires. 4.9.3 Determination steps and result expression
Perform in accordance with GB228.
4.10 Determination of uniformity of thickness of insulation layer
4.10.1 Instrument
Reading microscope: graduation value 0.01mm.
4.10.2 Sample
4.10.2.1 Take three samples of appropriate length at the outer end of the bundled wire every 1m as a group, and remove the conductive wire core in the insulation layer. 4.10.2.2 Use a sharp blade to cut a test piece along the plane perpendicular to the axis of the conductive wire core of the sample. 4.10.3 Determination steps
4.10.3.1 Place the test piece on the reading microscope with the cut surface perpendicular to the optical axis. 4.10.3.2 Single-core busbar: Measure the thinnest part of the test piece as the first measurement point. Measure six points at equal distances along the circumference of the test piece, record the data of each point, and take three decimal places in mm. 4.10.3.3 Two-core busbar: Measure the thinnest insulation between the cores of the conductive wires of the test piece and record the data of this point; then measure the other three points along the circumference of the test piece, using this point as four equal parts, and record the data of the six points on both sides of each sample. The data shall be taken to three decimal places and measured in mm. 4.10.4 Expression of measurement results
4.10.4.1 Single-core busbar: The arithmetic mean of the thickness of the thinnest part of the three samples shall be taken as the measured value of the thickness of the thinnest part of the insulation layer of this group of samples. 4.10.4.2 Two-core busbar:
a. Take the data of the thinnest insulation layer between the cores of the conductive wires of the three samples and calculate their arithmetic mean as the measured value of the thickness of the insulation layer between the cores of the conductive wires of this group of samples.
b. Take the data of the thinnest part of each sample and calculate their arithmetic mean as the measured value of the thickness of the thinnest part of the insulation layer of this group of samples. The calculated result is rounded to two decimal places
5 Inspection rules
5.1 Factory inspection
5.1.1 Products shall be inspected by the quality inspection department of the manufacturer. They can only be shipped after passing the inspection and issuing the certificate of conformity. 5.1.2 The items for product factory inspection are shown in Table 4. 5.2 Type inspection
5.2.1 Sampling is conducted on qualified products for type inspection. 5.2.2
MT376-1995
Type inspection shall be conducted in any of the following situations: trial production and identification of new products or old products transferred to the factory for production; after formal production, if there are major changes in materials and processes that may affect product performance; every two years of normal production;
When the product is resumed after a long period of suspension; when the factory inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. Table 4
Inspection items
Appearance quality
Diameter size
DC resistance
Water immersion withstand voltage
Zinc layer uniformity
Zinc layer firmness
Breaking force Tensile strength
Elongation at break
Insulation layer thickness uniformity
Technical requirements clauses
3.2.1;3.3.1;3.4.1
3.2.4;3.4.4
Note: "√" means inspection, "-" means no inspection. 5.2.3 Product type inspection items are as shown in Table 4. 5.3 Batch sampling
5.3.1 When the busbar is produced continuously, a batch shall be no more than 100 bundles. Delivery
5.3.2 The sampling method is random sampling. The number of random inspections shall be 5% of each batch, and the batch shall not be less than three bundles per hour. 5.4 Judgment rules
Type inspection
When there are unqualified items in the items of clauses 3.2.2, 3.2.3, 3.2.4, 3.4.3a, 3.4.3h, 3.4.4, 3.4.5, and 3.5.3, double sampling shall be carried out and the item shall be retested. If the retest fails, the batch of products shall be unqualified. 6 Marking, packaging, and storage
6.1 Marking
6.1.1 Product marking
The baling wire shall be attached with a label, and its contents shall include: a.
Manufacturer name;
Product name;
Net weight;
Manufacturing date;
Inspector's seal.
Packing mark
MT 376--1995
The outer surface of the packing box should be printed or pasted with a mark, which includes: a.
Manufacturer name;
Product name;
Net weight;
Color;
Anti-rain and anti-throw mark;
License number;
Outer dimensions of the packing box.
6.2 Packaging
6.2.1 The busbar should be wound neatly, with obvious and easy-to-find ends. The net weight of each bundle is 8-11kg, the number of wire segments in each bundle should not be more than two, and the weight of a single wire segment should not be less than 2kg. The inner diameter of the wire bundle is 200mm, and it is firmly tied with wires of the same color and evenly wrapped with packaging materials. 6.2.2 Every two bundles of busbars are packed in a packing box and tied firmly. 6.3 Storage
The product should be stored in a well-ventilated warehouse. Additional notes:
This standard was proposed by the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Blasting Technology and Explosive Products Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was jointly drafted by the Fushun Branch of the China Coal Research Institute and Shenyang No. 2 and No. 3 Plants. The main drafters of this standard are Fu Baocan, Li Weiguang, Xu Qilin, Liu Lishan, and Cui Yingjuan. This standard is interpreted by the Fushun Branch of the China Coal Research Institute. Copyright reserved. No reproduction allowed
Book number: 155066: 2-9899
Price:
Heading 264-593.2 When the immersion time reaches 45s, take out the sample steadily, wash it with water immediately, and wipe off the copper and its compounds attached to the zinc layer of the sample with absorbent cotton, and observe the surface of the sample. 4.8 Conductive wire core zinc layer firmness test
4.8.1 Equipment
The diameter of the test mandrel is 4.20mm and it should have sufficient hardness. Power winding is allowed, but it should comply with the winding speed specified in this standard.
4.8.2 Sample
Take a sample about 300mm long from the outer end of the bundle, remove the insulation layer, and remove seven single wires. 4.8.3 Test steps
Fix one end of the sample on the mandrel, hold the other end with your hand, and slowly and tightly wind 8 to 10 turns on the mandrel at a speed of 15 turns per minute, and observe the surface of the sample.
4.9 Determination of tensile strength and elongation at break of conductive wire core 4.9.1 Instrument
Tensile testing machine: measuring range 0～500N, accuracy 1.0 grade. 4.9.2 Sample
Take a sample of appropriate length from the outer end of the bundle, remove the insulation layer, and remove seven single wires. 4.9.3 Determination steps and result expression
Perform in accordance with GB228.
4.10 Determination of uniformity of insulation layer thickness
4.10.1 Instrument
Reading microscope: graduation value 0.01mm.
4.10.2 Sample
4.10.2.1 Take three samples of appropriate length as a group at every 1m from the outer end of the bundle, and remove the conductive wire core in the insulation layer. 4.10.2.2 Use a sharp blade to cut a test piece along the plane perpendicular to the axis of the conductive wire core of the sample. 4.10.3 Determination steps
4.10.3.1 Place the test piece on the reading microscope with the section perpendicular to the optical axis. 4.10.3.2 Single-core busbar: Measure the thinnest part of the test piece as the first measurement point. Measure six points at equal distances along the circumference of the test piece and record the data of each point to three decimal places in mm. 4.10.3.3 Double-core busbar: Measure the thinnest insulation between the conductive wire cores of the test piece and record the data of this point; then measure another three points along the circumference of the test piece, using this point as four equal parts, and record the data of the six points on both sides of each sample. The data is taken to three decimal places in mm. 4.10.4 Expression of measurement results
4.10.4.1 Single-core busbar: The arithmetic mean of the thickness of the thinnest part of the three samples is taken as the measured value of the thinnest insulation thickness of the group of samples. 4.10.4.2 Double-core busbar:
a. Take the data of the thinnest insulation layer between the conductive wire cores of the three samples and calculate their arithmetic mean as the measured value of the insulation layer thickness between the conductive wire cores of this group of samples.
b. Take the data of the thinnest part of each sample and calculate their arithmetic mean as the measured value of the insulation layer thickness at the thinnest part of this group of samples. The calculation result is rounded to two decimal places
5 Inspection rules
5.1 Factory inspection
5.1.1 Products shall be inspected by the quality inspection department of the manufacturer and can only be shipped after passing the inspection and issuing a certificate of conformity. 5.1.2 Product factory inspection items are shown in Table 4. 5.2 Type inspection
5.2.1 Sampling is conducted on qualified products for type inspection. 5.2.2
MT376-1995
Type inspection should be carried out in any of the following circumstances: trial production and identification of new products or old products transferred to other factories for production; after formal production, if there are major changes in materials or processes that may affect product performance; every two years of normal production;
when the production of a product is resumed after a long period of suspension; when there is a significant difference between the factory inspection results and the last type inspection results; when the national quality supervision agency proposes a requirement for type inspection. Table 4
Inspection items
Appearance quality
Diameter size
DC resistance
Water immersion withstand voltage
Zinc layer uniformity
Zinc layer firmness
Breaking force Tensile strength
Elongation at break
Insulation layer thickness uniformity
Technical requirements clauses
3.2.1;3.3.1;3.4.1
3.2.4;3.4.4
Note: "√" means inspection, "-" means no inspection. 5.2.3 Product type inspection items are as shown in Table 4. 5.3 Batch sampling
5.3.1 When the busbar is produced continuously, a batch shall be no more than 100 bundles. Delivery
5.3.2 The sampling method is random sampling. The number of random inspections shall be 5% of each batch, and the batch shall not be less than three bundles per hour. 5.4 Judgment rules
Type inspection
When there are unqualified items in the items of clauses 3.2.2, 3.2.3, 3.2.4, 3.4.3a, 3.4.3h, 3.4.4, 3.4.5, and 3.5.3, double sampling shall be carried out and the item shall be retested. If the retest fails, the batch of products shall be unqualified. 6 Marking, packaging, and storage
6.1 Marking
6.1.1 Product marking
The baling wire shall be attached with a label, and its contents shall include: a.
Manufacturer name;
Product name;
Net weight;
Manufacturing date;
Inspector's seal.
Packing mark
MT 376--1995
The outer surface of the packing box should be printed or pasted with a mark, which includes: a.
Manufacturer name;
Product name;
Net weight;
Color;bZxz.net
Anti-rain and anti-throw mark;
License number;
Outer dimensions of the packing box.
6.2 Packaging
6.2.1 The busbar should be wound neatly, with obvious and easy-to-find ends. The net weight of each bundle is 8-11kg, the number of wire segments in each bundle should not be more than two, and the weight of a single wire segment should not be less than 2kg. The inner diameter of the wire bundle is 200mm, and it is firmly tied with wires of the same color and evenly wrapped with packaging materials. 6.2.2 Every two bundles of busbars are packed in a packing box and tied firmly. 6.3 Storage
The product should be stored in a well-ventilated warehouse. Additional notes:
This standard was proposed by the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Blasting Technology and Explosive Products Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was jointly drafted by the Fushun Branch of the China Coal Research Institute and Shenyang No. 2 and No. 3 Plants. The main drafters of this standard are Fu Baocan, Li Weiguang, Xu Qilin, Liu Lishan, and Cui Yingjuan. This standard is interpreted by the Fushun Branch of the China Coal Research Institute. Copyright reserved. No reproduction allowed
Book number: 155066: 2-9899
Price:
Heading 264-593.2 When the immersion time reaches 45s, take out the sample steadily, wash it with water immediately, and wipe off the copper and its compounds attached to the zinc layer of the sample with absorbent cotton, and observe the surface of the sample. 4.8 Conductive wire core zinc layer firmness test
4.8.1 Equipment
The diameter of the test mandrel is 4.20mm and it should have sufficient hardness. Power winding is allowed, but it should comply with the winding speed specified in this standard.
4.8.2 Sample
Take a sample about 300mm long from the outer end of the bundle, remove the insulation layer, and remove seven single wires. 4.8.3 Test steps
Fix one end of the sample on the mandrel, hold the other end with your hand, and slowly and tightly wind 8 to 10 turns on the mandrel at a speed of 15 turns per minute, and observe the surface of the sample.
4.9 Determination of tensile strength and elongation at break of conductive wire core 4.9.1 Instrument
Tensile testing machine: measuring range 0～500N, accuracy 1.0 grade. 4.9.2 Sample
Take a sample of appropriate length from the outer end of the bundle, remove the insulation layer, and remove seven single wires. 4.9.3 Determination steps and result expression
Perform in accordance with GB228.
4.10 Determination of uniformity of insulation layer thickness
4.10.1 Instrument
Reading microscope: graduation value 0.01mm.
4.10.2 Sample
4.10.2.1 Take three samples of appropriate length as a group at every 1m from the outer end of the bundle, and remove the conductive wire core in the insulation layer. 4.10.2.2 Use a sharp blade to cut a test piece along the plane perpendicular to the axis of the conductive wire core of the sample. 4.10.3 Determination steps
4.10.3.1 Place the test piece on the reading microscope with the section perpendicular to the optical axis. 4.10.3.2 Single-core busbar: Measure the thinnest part of the test piece as the first measurement point. Measure six points at equal distances along the circumference of the test piece and record the data of each point to three decimal places in mm. 4.10.3.3 Double-core busbar: Measure the thinnest insulation between the conductive wire cores of the test piece and record the data of this point; then measure another three points along the circumference of the test piece, using this point as four equal parts, and record the data of the six points on both sides of each sample. The data is taken to three decimal places in mm. 4.10.4 Expression of measurement results
4.10.4.1 Single-core busbar: The arithmetic mean of the thickness of the thinnest part of the three samples is taken as the measured value of the thinnest insulation thickness of the group of samples. 4.10.4.2 Double-core busbar:
a. Take the data of the thinnest insulation layer between the conductive wire cores of the three samples and calculate their arithmetic mean as the measured value of the insulation layer thickness between the conductive wire cores of this group of samples.
b. Take the data of the thinnest part of each sample and calculate their arithmetic mean as the measured value of the insulation layer thickness at the thinnest part of this group of samples. The calculation result is rounded to two decimal places
5 Inspection rules
5.1 Factory inspection
5.1.1 Products shall be inspected by the quality inspection department of the manufacturer and can only be shipped after passing the inspection and issuing a certificate of conformity. 5.1.2 Product factory inspection items are shown in Table 4. 5.2 Type inspection
5.2.1 Sampling is conducted on qualified products for type inspection. 5.2.2
MT376-1995
Type inspection should be carried out in any of the following circumstances: trial production and identification of new products or old products transferred to other factories for production; after formal production, if there are major changes in materials or processes that may affect product performance; every two years of normal production;
when the production of a product is resumed after a long period of suspension; when there is a significant difference between the factory inspection results and the last type inspection results; when the national quality supervision agency proposes a requirement for type inspection. Table 4
Inspection items
Appearance quality
Diameter size
DC resistance
Water immersion withstand voltage
Zinc layer uniformity
Zinc layer firmness
Breaking force Tensile strength
Elongation at break
Insulation layer thickness uniformity
Technical requirements clauses
3.2.1;3.3.1;3.4.1
3.2.4;3.4.4
Note: "√" means inspection, "-" means no inspection. 5.2.3 Product type inspection items are as shown in Table 4. 5.3 Batch sampling
5.3.1 When the busbar is produced continuously, a batch shall be no more than 100 bundles. Delivery
5.3.2 The sampling method is random sampling. The number of random inspections shall be 5% of each batch, and the batch shall not be less than three bundles per hour. 5.4 Judgment rules
Type inspection
When there are unqualified items in the items of clauses 3.2.2, 3.2.3, 3.2.4, 3.4.3a, 3.4.3h, 3.4.4, 3.4.5, and 3.5.3, double sampling shall be carried out and the item shall be retested. If the retest fails, the batch of products shall be unqualified. 6 Marking, packaging, and storage
6.1 Marking
6.1.1 Product marking
The baling wire shall be attached with a label, and its contents shall include: a.
Manufacturer name;
Product name;
Net weight;
Manufacturing date;
Inspector's seal.
Packing mark
MT 376--1995
The outer surface of the packing box should be printed or pasted with a mark, which includes: a.
Manufacturer name;
Product name;
Net weight;
Color;
Anti-rain and anti-throw mark;
License number;
Outer dimensions of the packing box.
6.2 Packaging
6.2.1 The busbar should be wound neatly, with obvious and easy-to-find ends. The net weight of each bundle is 8-11kg, the number of wire segments in each bundle should not be more than two, and the weight of a single wire segment should not be less than 2kg. The inner diameter of the wire bundle is 200mm, and it is firmly tied with wires of the same color and evenly wrapped with packaging materials. 6.2.2 Every two bundles of busbars are packed in a packing box and tied firmly. 6.3 Storage
The product should be stored in a well-ventilated warehouse. Additional notes:
This standard was proposed by the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Blasting Technology and Explosive Products Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was jointly drafted by the Fushun Branch of the China Coal Research Institute and Shenyang No. 2 and No. 3 Plants. The main drafters of this standard are Fu Baocan, Li Weiguang, Xu Qilin, Liu Lishan, and Cui Yingjuan. This standard is interpreted by the Fushun Branch of the China Coal Research Institute. Copyright reserved. No reproduction allowed
Book number: 155066: 2-9899
Price:
Heading 264-594.10.4.1 Single-core busbar: The arithmetic mean of the thickness of the thinnest part of the three samples shall be taken as the measured value of the thickness of the thinnest part of the insulation layer of the group of samples. 4.10.4.2 Double-core busbar: a. Take the data of the thinnest insulation layer between the cores of the three samples and calculate the arithmetic mean as the measured value of the thickness of the insulation layer between the cores of the conductive wires of the group of samples. b. Take the data of the thinnest part of each sample and calculate the arithmetic mean as the measured value of the thickness of the thinnest part of the insulation layer of the group of samples. The calculated results shall be rounded to two decimal places. 5 Inspection rules 5.1 Factory inspection 5.1.1 Products shall be inspected by the quality inspection department of the manufacturer and may only be shipped after passing the inspection and issuing a certificate of conformity. 5.1.2 Product factory inspection items are shown in Table 4. 5.2 Type inspection
5.2.1 Sampling of qualified products for type inspection. 5.2.2
MT376-1995
Type inspection should be carried out in any of the following situations: trial production and identification of new products or old products transferred to the factory for production; after formal production, if there are major changes in materials and processes that may affect product performance; every two years of normal production;
When the product is resumed after a long period of suspension; when the factory inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. Table 4
Inspection items
Appearance quality
Diameter size
DC resistance
Water immersion withstand voltage
Zinc layer uniformity
Zinc layer firmness
Breaking force Tensile strength
Elongation at break
Insulation layer thickness uniformity
Technical requirements clauses
3.2.1;3.3.1;3.4.1
3.2.4;3.4.4
Note: "√" means inspection, "-" means no inspection. 5.2.3 Product type inspection items are as shown in Table 4. 5.3 Batch sampling
5.3.1 When the busbar is produced continuously, a batch shall be no more than 100 bundles. Delivery
5.3.2 The sampling method is random sampling. The number of random inspections shall be 5% of each batch, and the batch shall not be less than three bundles per hour. 5.4 Judgment rules
Type inspection
When there are unqualified items in the items of clauses 3.2.2, 3.2.3, 3.2.4, 3.4.3a, 3.4.3h, 3.4.4, 3.4.5, and 3.5.3, double sampling shall be carried out and the item shall be retested. If the retest fails, the batch of products shall be unqualified. 6 Marking, packaging, and storage
6.1 Marking
6.1.1 Product marking
The baling wire shall be attached with a label, and its contents shall include: a.
Manufacturer name;
Product name;
Net weight;
Manufacturing date;
Inspector's seal.
Packing mark
MT 376--1995
The outer surface of the packing box should be printed or pasted with a mark, which includes: a.
Manufacturer name;
Product name;
Net weight;
Color;
Anti-rain and anti-throw mark;
License number;
Outer dimensions of the packing box.
6.2 Packaging
6.2.1 The busbar should be wound neatly, with obvious and easy-to-find ends. The net weight of each bundle is 8-11kg, the number of wire segments in each bundle should not be more than two, and the weight of a single wire segment should not be less than 2kg. The inner diameter of the wire bundle is 200mm, and it is firmly tied with wires of the same color and evenly wrapped with packaging materials. 6.2.2 Every two bundles of busbars are packed in a packing box and tied firmly. 6.3 Storage
The product should be stored in a well-ventilated warehouse. Additional notes:
This standard was proposed by the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Blasting Technology and Explosive Products Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was jointly drafted by the Fushun Branch of the China Coal Research Institute and Shenyang No. 2 and No. 3 Plants. The main drafters of this standard are Fu Baocan, Li Weiguang, Xu Qilin, Liu Lishan, and Cui Yingjuan. This standard is interpreted by the Fushun Branch of the China Coal Research Institute. Copyright reserved. No reproduction allowed
Book number: 155066: 2-9899
Price:
Heading 264-594.10.4.1 Single-core busbar: The arithmetic mean of the thickness of the thinnest part of the three samples shall be taken as the measured value of the thickness of the thinnest part of the insulation layer of the group of samples. 4.10.4.2 Double-core busbar: a. Take the data of the thinnest insulation layer between the cores of the three samples and calculate the arithmetic mean as the measured value of the thickness of the insulation layer between the cores of the conductive wires of the group of samples. b. Take the data of the thinnest part of each sample and calculate the arithmetic mean as the measured value of the thickness of the thinnest part of the insulation layer of the group of samples. The calculated results shall be rounded to two decimal places. 5 Inspection rules 5.1 Factory inspection 5.1.1 Products shall be inspected by the quality inspection department of the manufacturer and may only be shipped after passing the inspection and issuing a certificate of conformity. 5.1.2 Product factory inspection items are shown in Table 4. 5.2 Type inspection
5.2.1 Sampling of qualified products for type inspection. 5.2.2
MT376-1995
Type inspection should be carried out in any of the following situations: trial production and identification of new products or old products transferred to the factory for production; after formal production, if there are major changes in materials and processes that may affect product performance; every two years of normal production;
When the product is resumed after a long period of suspension; when the factory inspection results are significantly different from the last type inspection; when the national quality supervision agency proposes a requirement for type inspection. Table 4
Inspection items
Appearance quality
Diameter size
DC resistance
Water immersion withstand voltage
Zinc layer uniformity
Zinc layer firmness
Breaking force Tensile strength
Elongation at break
Insulation layer thickness uniformity
Technical requirements clauses
3.2.1;3.3.1;3.4.1
3.2.4;3.4.4
Note: "√" means inspection, "-" means no inspection. 5.2.3 Product type inspection items are as shown in Table 4. 5.3 Batch sampling
5.3.1 When the busbar is produced continuously, a batch shall be no more than 100 bundles. Delivery
5.3.2 The sampling method is random sampling. The number of random inspections shall be 5% of each batch, and the batch shall not be less than three bundles per hour. 5.4 Judgment rules
Type inspection
When there are unqualified items in the items of clauses 3.2.2, 3.2.3, 3.2.4, 3.4.3a, 3.4.3h, 3.4.4, 3.4.5, and 3.5.3, double sampling shall be carried out and the item shall be retested. If the retest fails, the batch of products shall be unqualified. 6 Marking, packaging, and storage
6.1 Marking
6.1.1 Product marking
The baling wire shall be attached with a label, and its contents shall include: a.
Manufacturer name;
Product name;
Net weight;
Manufacturing date;
Inspector's seal.
Packing mark
MT 376--1995
The outer surface of the packing box should be printed or pasted with a mark, which includes: a.
Manufacturer name;
Product name;
Net weight;
Color;
Anti-rain and anti-throw mark;
License number;
Outer dimensions of the packing box.
6.2 Packaging
6.2.1 The busbar should be wound neatly, with obvious and easy-to-find ends. The net weight of each bundle is 8-11kg, the number of wire segments in each bundle should not be more than two, and the weight of a single wire segment should not be less than 2kg. The inner diameter of the wire bundle is 200mm, and it is firmly tied with wires of the same color and evenly wrapped with packaging materials. 6.2.2 Every two bundles of busbars are packed in a packing box and tied firmly. 6.3 Storage
The product should be stored in a well-ventilated warehouse. Additional notes:
This standard was proposed by the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard is under the jurisdiction of the Blasting Technology and Explosive Products Branch of the Coal Mine Safety Standardization Technical Committee of the Ministry of Coal Industry. This standard was jointly drafted by the Fushun Branch of the China Coal Research Institute and Shenyang No. 2 and No. 3 Plants. The main drafters of this standard are Fu Baocan, Li Weiguang, Xu Qilin, Liu Lishan, and Cui Yingjuan. This standard is interpreted by the Fushun Branch of the China Coal Research Institute. Copyright reserved. No reproduction allowed
Book number: 155066: 2-9899
Price:
Heading 264-59
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