GB/T 14823.1-1993 Special requirements for conduits for electrical installations - Metal conduits
Some standard content:
National Standard of the People's Republic of China
Conduits for electrical installations
Special requirements
Metal conduits
Particular specificutiuns for metalconduits for electrical instailationsGB/T 14823.1-93
This standard refers to and adopts the international standards IEC614-2-1 (1982 "Technical requirements for conduits for electrical installations Part 2: Particular requirements for metal conduits" and IEC423 (1973) "Outer diameter of conduits for electrical installations and threads of conduits and accessories" and its supplementary documents in 1978.
1 Subject content and scope of application
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of rigid metal flat conduits for electrical installations (hereinafter referred to as conduits).
This standard applies to rigid metal flat conduits with circular cross-sections used to protect wires or cables in electrical installations of lines of 1000V and below.
2 Reference standards
GB/T13381.1 General requirements for conduits for electrical installationsGB2828 Batch inspection counting sampling procedures and sample tables (applicable to inspection of sub-continuous batches)GB2829
GB 2102
GB3640
GB10623
GB 1801
GB 3934
3 Terminology
Periodic inspection counting sampling procedures and sampling tables (applicable to the inspection of the stability of the production process) Acceptance, packaging, marking and quality certificate of steel pipes Ordinary carbon steel wire casing
Metal mechanical properties test terms
Tolerance and fit dimensions to 500mm holes, shaft tolerance zones and fits Ordinary thread basic tooth profile
Ordinary thread basic dimensions (diameter 1~600mm) Ordinary thread tolerances and fits (diameter 1~355mm) Ordinary thread basic specifications
Steel conduitstee! conduit
Conduit made of steel as the base material.
4 Classification and conduit marking
4.1 Classification
4.1.1 Classification by mechanical properties
a Conduit that can withstand very small mechanical stress (referred to as "ultra-light conduit"); approved by the State Bureau of Technical Supervision on December 30, 1993 and implemented on October 1, 1994
GB/T 14823. 1-93
Conduit that can withstand small mechanical stress (referred to as "light conduit"); Conduit that can withstand medium mechanical stress (referred to as "medium conduit"); Conduit that can withstand greater mechanical stress (referred to as "heavy conduit"); Conduit that can withstand great mechanical stress (referred to as "super-heavy conduit"). 4. 1.2 Classification by corrosion and pollution prevention
4.1.2.1 Ducts with the same protection capabilities on both the outside and inside: a.
Ducts with lower protection capabilities;
Ducts with medium protection capabilities;
Ducts with higher protection capabilities.
4.1.2.2 Ducts with higher protection capabilities on the outside and lower protection capabilities on the inside a.
Ducts with medium protection capabilities on the outside and lower protection capabilities on the inside; Ducts with high protection capabilities on the outside and lower protection capabilities on the inside; Ducts with high protection capabilities on the outside and lower protection capabilities on the inside. 4.2 Duct markings
Each duct shall be marked with:
Manufacturer name, trademark or other identification symbol 1 Model, (or manufacturing material), outer diameter, one performance mark in accordance with A1 in Appendix A, and additional performance mark in accordance with A2 in Appendix A. The first mark is about 50 mm from the end of the duct, and the duct shall be re-marked every 1 to 3 m thereafter. The order of marking is as follows:
Outer diameter
The whole marking indicates:
Guangzhou XX Guang
Manufacturer name (or trademark)
3/110060
Performance digital
The TA type produced by Guangzhou XX Factory has an outer diameter of 32mm, and is a rigid metal flat conduit that can withstand moderate mechanical stress, has electrical continuity, and has high corrosion resistance on the inner and outer walls. h.
Manufacturing material
The whole marking indicates:
Outer diameter
Guangzhou XX Guang
Manufacturer (or trademark)
3/110060
Performance digital
The rigid steel conduit produced by Guangzhou XX Factory and made of Q215 steel, has an outer diameter of 25mm, and has moderate mechanical stress, electrical continuity, and has high corrosion resistance on the inner and outer walls. The meaning of the performance numbers is shown in Appendix A.
4.2.4 The marking should be durable and easy to identify clearly. 4.2.5 The marking can be made by molding, printing, gluing labels, watermark transplantation and other methods. 5 Structure, size
5.1 Size ("nominal size")
5.1.1 The outer diameter of the catheter shall comply with the corresponding provisions of the "catheter outer diameter dimension d" item in Table 1 and Table 2. The outer diameter tolerance shall comply with the corresponding requirements of the "outer diameter tolerance" item in Table 1 and Table 2 (see Figures 1 and 2). 5.1.2 The thickness of the tube shall comply with the corresponding provisions of the "wall thickness" and "minimum wall thickness:\ items in Table 1 and Table 2 (see Figures 1 and 2). Catheter outer diameter dimension d
Outer diameter male pad
Catheter outer diameter dimension a
Outer diameter tolerance
Minimum ink thickness.
Thread length 1
Thread tail
GB/T 14823.1
Outer diameter and wall thickness of non-threaded conduits Table 1
1. 0 on 0. 1
1. 2 + 0. 12
Figure 2 Details of threaded conduits
1. 5±0. 15
1.6±0.15
The minimum outer diameter of the conduit shall not be less than the corresponding dimension of item *c\ in Table 3 (see Figure 3). 5. 1. 3
1.9±0.18
19±!
, -0.05mm; allowable wear: 0. 01mm Manufacturing material: polished steel, manufacturing tolerance, Figure 3 Check the minimum outer diameter of the catheter
Catheter outer diameter size
GB/T 14823.1-93
Manufacturing specifications
Allowable wear
The minimum inner diameter of the catheter after bending should allow the gauge that meets the corresponding size of item \D\ in Figure 4 and Table 4 to pass. 2D
Manufacturing material: solid polished steel: the edges are slightly rounded. Axial dimension tolerance + ± 0.2mm; allowable wear: 0.01mm. Manufacturing tolerance: 10.05m.
Figure 4 Gauges for checking the minimum inner diameter of the catheter after bending Table 4
Gauges for the outer diameter of the catheter
5.1.5 The thread profile of the catheter shall comply with the provisions of GB192, and its length tail shall comply with the corresponding provisions of \\ and "\ in Table 2. 5.1.6 The catheter thread is a fine thread with a pitch of 1.5mm. The detailed dimensions of the thread shall comply with the corresponding provisions of GB196. GB/T 14823.1: 93
5.1.7 The tolerance and fit of the catheter thread shall comply with the provisions of GB197. The tolerance grade of each diameter of the external thread is 8 grades and the tolerance grade of each diameter of the internal thread is 7 grades.
5.18 The manufacturing length of the academic tube is generally 4m The tolerance of the standard length is +3°C mm5.1.9 In addition to the small specifications of this standard, the size of the conduit and its manufacturing length can be agreed upon by the supply and demand parties. Note: When there are special standards for the size and thread of the above-mentioned conduits, this standard should be adopted. 5.2 Appearance, structure
5.2.1 The conduit should be a seamless pipe or a welded pipe, and its surface should have no obvious unevenness and similar defects; there should be no cracks and scars, burns, deep scratches (but slight indentations, straight lines, scratches and pits with a diameter of less than 2mm that are not greater than the allowable deviation of the wall thickness are allowed), and the edge of the pipe mouth should be smooth (can be chamfered with 0.5×45°) so as not to damage the insulation layer of the conductor or cable. 5.2.2 Galvanizing or other coatings The surface of the conduit should have a complete and uniform chain and coating. This protective layer should not have cracks, bubbles or peeling. The internal weld should be smooth and round. The weld height should not exceed 0.3mm and should not damage the insulation layer of the wires and cables. 5.2.3 The threads of the conduit should be neat, smooth and free of cracks. Black skin is allowed on the threads at the weld of the steel conduit, but the reduction in the thread section width should not exceed 15% of the specified height, the total length of the broken or incomplete thread shape should not exceed 10% of the specified length, and the same part of two adjacent buckles should not be broken at the same time. A pipe joint is required at one end of each conduit. 5.2.4 A small amount of rolling scars formed due to manufacturing can be ignored if they do not damage the insulation layer of the wires and cables. 5.2.5 The wall thickness of the conduit shall be uniform. After the uniformity test of the wall thickness in 7.4.3, its uniformity shall conform to the following formula: IM; - M/ ≤ 0.1M + 0.1mm (t = 1,2,3---12)-***-**********--+***( 1 ) Where: M——each wall thickness measured value, a total of 12 M——the average value of 12 measured values,
6 Technical requirements
6.1 Mechanical properties
6.1.1 Compression requirements
After the pressure test in 7.5.1, the difference between the original outer diameter of the conduit and the outer diameter when the pressure is still there shall not exceed 10% of the original outer diameter: after the pressure is evacuated for 1 minute, the difference between the original outer diameter and the outer diameter of the flattened part shall not exceed 10% of the original outer diameter. No cracks shall appear on the surface of the conduit.
6.1.2 Bending requirements
After the conduit is subjected to the bending test in 7.5.2, its material and protective layer shall not have cracks or fall off, the weld shall not crack, and the gauge corresponding to the D" item in Figure 4 and Table 4 shall be able to pass through the conduit under the action of its own weight without any initial velocity. 6.2 Electrical performance
This is only for steel conduits. The electrical performance requirements of other metal conduits are under consideration. When the steel conduit is subjected to the electrical continuity test in 7.6.1, its resistance shall not be greater than 0.050. 6.3 Protection capability
This is only for steel conduits that are not coated or sprayed with plastic. The protection capability requirements of other metal conduits are under consideration. Steel conduits with different protection capabilities shall be able to pass the corresponding requirements in Table 5. Protection test (protection test a, protection test b, protection test c are referred to as a, bc).
Protection capability of the catheter
Low inside and outside
Medium inside and outside
High inside and outside
Medium outside and low inside
High outside and low inside
High outside and medium inside
GB/T14823.1—93
Protection test to be carried out
Outside b inside a
Outside center:
Outside inside h
Note: Inside and outside refer to the inner and outer surfaces of the catheter; high, A, and low refer to the protection capability level of the catheter. 7 Test method
7.1 Test room ambient temperature
Test method clauses
7. 7. 2 and 7. 7. 1
7. 7. 3 and 7. 7. 1
7. 7. 3 and 7, 7. 2
Unless otherwise specified, the test is usually carried out at room temperature: in case of dispute, the test is carried out at 25±5℃. 7. 1.2 Test specimens
Unless otherwise specified, each type test shall be carried out on 3 test specimens. Randomly select 3 tubes, cut the test specimens for various tests from these tubes, and each tube provides a test specimen for each test. 7.2 Marking inspection
Use a piece of cloth fully soaked in water to wipe the mark at a speed of 2 times/(the forward and backward movements of the hand are counted as 1 time each) at a uniform speed for 15s, then use a piece of cloth fully soaked in gasoline to wipe at the same speed for 15s, and then inspect according to the requirements of Article 4.2. 7. 3. Check the gauge
7.3.1 The outer diameter of the conduit is measured with a vernier caliper with a graduation value of not less than 0.02mm. 7.3.2 The shape and detailed dimensions of the gauge for measuring the minimum outer diameter of the conduit are shown in Figure 3 and Table 3. When measuring the conduit of the corresponding size, the conduit that cannot pass the gauge without any external force is qualified. 7.3.3 The shape and detailed dimensions of the gauge for measuring the minimum inner diameter of the conduit after bending are shown in Figure 4 and Table 4. When measuring the conduit of the corresponding size, the conduit that can pass the gauge without any external force and initial velocity is qualified. 7.3.4 The thread and detailed dimensions of the conduit are measured with a crown gauge and appropriate measuring tools in accordance with GB3934. 7.3.5 The wall thickness of the conduit is measured in the same way as in Article 7.4.3. The average value is obtained after testing with a wall micrometer or other appropriate tools. The length of the conduit is measured with a steel tape measure with an accuracy of not less than 0.5mm. 7.4 External gauge and joint inspection
7.4.1 Use daily measuring tools with appropriate accuracy to check the surface quality and structure of the conduit. 7.4.2 If necessary, the sample can be cut and longitudinally split for inspection. 7.4.3 Wall thickness uniformity inspection: Generally, visual inspection is sufficient; if in doubt, three samples can be taken from the same section of the conduit (cut along the surface perpendicular to the axis, and then measure at four positions on the circumference of each cut as equally as possible, one of which is the thinnest part of the pipe wall.
The measured values are 12 in total, and the average value is calculated and then checked according to formula (1) (plating and coating are not included in the measurement). 7.5 Mechanical properties test
7.5.1 Pressure test
Cut three 200mm long samples, first measure their outer diameter D, and place them flat on a steel support, and place a steel block at the center of the sample, as shown in Figure GB/T 14823. 1—93
5 (for the sample with welding bell, the steel block is pressed on its weld). Slowly apply a gradually increasing force F on the steel block. If the value shown in Table 6 is not reached after 30s,
After applying force for 1min, maintain the pressure and measure the outer diameter D of the sample at the flattening point: Then remove the pressure and the steel block. After 1min, measure the outer diameter Ds of the sample at the flattening point.
The difference between Di and D, and the difference between, and D, are not more than 10% of Di for qualified. Then, check whether there are cracks on the outer surface of the sample. . Question: Steel block
Support
Figure 5 Arrangement of pressure test
Type of force on conduit
·Ultra-light
Ultra-heavy
7.5.2 Bending test
Test pressure F
7.5.2.1 The specimen with an outer diameter not exceeding 25 mm shall be bent into an angle of 90° using a bending device in accordance with the corresponding dimensions in Figure 6 and Table 7; the inner radius of the curvature shall be 6 times the outer diameter of the specimen. Outer diameter of conduit||tt| |M sectionbzxz.net
GB/T14823.1—93
Figure 6 Bending device
Bending radius
Inner radius K
Outer radius R
Groove radius
7.5.2.2 For specimens with an outer diameter greater than 25 mm, use a pipe bender to bend them into a 90° angle, and the inner radius of the curvature is 6 times the outer diameter of the specimen (fillers can be added when necessary, and the manufacturer's instructions on the bending test can be considered without violating this technical requirement). 7.5.2. 3 For the test specimens with welds, use 6 test specimens for this test. The welds of 3 test specimens are outside the bend and in the plane of the bend (see Figure 7); the welds of the other 3 test specimens are on the outer side of the bend and form a 90° angle with the bend plane (see Figure 8). 7.5.2.4 After bending, let the straight part of the test specimen be at a 45° angle to the plumb line, with one end facing up and the other end facing down, and place it in a gauge that meets the corresponding dimensions of item *D\ in Figure 4 and Table 4, observe its passing condition, and check it according to the requirements of 6.1.2. GB/T 14823.1-93
Figure shows the position of the weld when the conduit is bent (--) (the weld is outside the bend and the ear is on the bend plane) 7.6 Electrical performance inspection
7.6.1 Electrical continuity test
Only for steel conduits, the test method for other metal conduits is under consideration. Figure 8 Position of the weld seam of the conduit bend (．) (The weld chain is outside the bend and perpendicular to the bend plane) Connect the two ends of 10 sections of 200mm long non-threaded steel conduit samples and 9 pipe joints (or connectors provided by the manufacturer) of the corresponding sizes in Figure 9 and Table 8 (when necessary, connect together with their continuity devices). When connecting, remove the coating and plating on the sample that have an adverse effect on electrical continuity, and wipe it clean with 0.75 concentration alcohol. After connecting to an assembly, input 25A and 5060Hz AC current (provided by an AC power supply with a no-load voltage of no more than 12V) at both ends of the assembly for 1 minute, and measure the voltage at both ends of the assembly. The ratio of the obtained voltage to the input current (i.e. the resistance value) is not greater than 0.05, which is qualified. 3mm
Pipe joint for electric continuity test
Figure 9 Electric
Outer diameter of conduit
Maximum inner diameter
Inner diameter 4
(minimum)
(maximum)
(minimum)
(maximum)
Thickness.
7.7 Protection capability check
1. 5 1 0. 1
2. 0±0.1
Only for steel conduit surface without coating or spraying plastic, the protection capability of other metal conduits is under consideration. 7.7.1 Anti-expansion test a
Sandwich a piece of cardboard or similar material with a thickness of about 3mm between the sample and a smooth steel round object, and then let the sample surround the round object GB/T 14823.1—93
Bend the object slowly. For the specimen with an outer diameter not exceeding 25 mm, the inner radius of curvature of the bend is 10 times the outer diameter of the specimen; for the specimen with an outer diameter of other sizes, the inner radius of curvature of the bend is 12 times the outer diameter of the specimen. After bending, the specimen with no damage to the protective layer is qualified. 7. 7. 2 Protection test b
Bend the specimens according to the requirements of 7.5.2, wipe them clean with a piece of fiber material soaked in benzene, air dry them, and immerse the bent part of each specimen in a mixed aqueous solution of 0.75% potassium ferric sulfate [K, Fe(CN). J and 0.25% ammonium persulfate [(NH,), S, O,], and add about 0.1% (such as sodium salt of alkyl naphthalene sulfonate) wetting reagent to the solution. The temperature of the solution and the specimen should be maintained at 20+1℃. Each sample shall be tested separately. A new solution shall be used for each test. After soaking for 5 minutes, take out the sample and dry it at room temperature.
After this test, there shall be no more than two blue spots per square meter of raw water on the sample, and there shall be no spots with a diameter greater than 1.5 μm. Rust marks on the sharp edges and threads of the sample and any light yellow film that can be wiped off can be ignored. 7.7.3 Protection test c
The sample bent according to the requirements of 7.5.2 shall be immersed in a trichloroethylene towel for 10 seconds to remove grease. Then wipe it dry with a clean cloth. The sample shall be immersed in a 2% sulfuric acid solution for 15 seconds, then rinsed with running water, wiped dry with a soft cloth, and its bent part shall be immersed in a distilled water solution of copper sulfide (CuSO.5HI,0) (the specific gravity of this solution at 20°C is 1.186 kg/L). The temperature of the solution and the sample shall be maintained at 20±1°C without stirring.
Preparation of copper sulfate solution: First dissolve 360g of copper sulfate (CuS0,·5H2O) crystals (chemically pure) in 100% steamed stuffing water, and then add carbonic acid or copper hydroxide at a ratio of about 1g/1. If necessary, check and adjust the specific gravity of the solution. The container cannot react chemically with the solution, and its size should be such that the distance between the sample and the container wall is at least 25mm. Each sample should be immersed in the same solution for 4 times in a row, each time for 1min, and the solution used for each sample should be new. After each immersion, take out the sample and immediately rinse it with running water, and use a brush to remove the black precipitate on it. Carefully clean all holes and holes, and then wipe the sample with a clean soft cloth. Except for the fourth immersion, the sample should be immediately put into the solution for each time. After the test, observe whether there is copper precipitation on the sample. If necessary, immerse it in a 10% hydrochloric acid (HCl) aqueous solution for 15 seconds. Copper precipitation on the thread can be ignored. Note: 1 The bent part of the sample and its weld should be immersed under the filter surface during immersion. For pipes with welds, the test should be carried out in 7.7 tea tests under different bending conditions of the welds, and the immersion range of the sample should be accurately recorded for inspection after the test. The inspection of the protective ability of the inner surface of the sample can be carried out by cutting it open along the axis of the sample after the test. 8 Inspection rules
8.1 Factory inspection
8.1.1 All conduits submitted for delivery must be inspected according to the factory inspection items. The items, requirements and methods of factory inspection are shown in Table 9. Table 9
Test items
Marking inspection
Dimension inspection
Appearance and structural inspection
Chapter and clause of this standard
Technical requirements
Test method
Classification of non-conformance
8.1.2 Factory inspection should be randomly selected from each batch of submitted goods. Sampling and inspection evaluation shall be in accordance with CB 2828, as shown in Table 10, see Appendix B (Supplement) for details
Sampling plan strictness
Normal inspection
GB/T 14823.1-93
Inspection level
One-way inspection level
Sampling plan type
Secondary sampling
Qualified quality level AQI
Class B unqualified: 4
Class C unqualified: 6.5
Each sample is considered qualified only when the requirements of Class B and Class C unqualified meet the qualified quality level; the qualification of each batch is determined by the corresponding A., R. numbers in Appendix B
8.1.3 The adjustment of the strictness of the factory inspection sampling plan shall be carried out in accordance with Article 4.6.3 of GB2828 "Transfer Rules\" and determined by the factory's quality inspection department.
8.1.4 All unqualified products and unqualified batches in factory inspection shall be reworked to make them qualified; those that are still unqualified after rework shall be scrapped. 8.1.5 The items of acceptance inspection, sample quantity and qualified judgment standard can be agreed upon by the supplier and the buyer. 8.1.6 The ordering party has the right to check whether the quality of the catheter meets the requirements. If necessary, the manufacturer shall provide the factory inspection and type inspection report of the catheter for inspection.
8.1.7 If there is a dispute during the acceptance, the supplier and the buyer shall negotiate to resolve it until it is submitted to the higher-level quality inspection department or statutory department for arbitration. 8.1.8 Under the conditions of storage and use of the catheter specified in the regulations, if the catheter is damaged or cannot be used normally due to poor manufacturing within 12 months from the date of leaving the factory, the manufacturer shall replace it. 8.2 Type inspection
In the following cases, the catheter shall be subjected to type inspection: trial-produced new catheters or trial-production identification of old catheters in factory production: when the catheter has major changes in design, process, and materials; when it is discontinued for a year and then resumed;
when there is a major difference between the factory inspection and the last type inspection; when the national quality supervision agency proposes to conduct type inspection; for catheters produced in batches, regular random inspections shall be conducted once a year. The items, requirements, methods, and number of samples for type inspection are shown in Table 11. Table 11
Test items
Marking inspection
Size inspection
Appearance and structure inspection
Bending test
Auxiliary test
Electrical continuity test
Pressure test
Chapters and clauses of this standard
Technical requirements
Test methods
Quantity of test sample per test
(with marking)
For non-welded chain guide, 1.2m×3
For welded chain guide: 1. 2m×6
For guide arms without welds
1.2m×3 (same protection for inner and outer surfaces), 1.2m×6 (different protection for inner and outer surfaces)
For guide arms with welds
1.2m×6 (same protection for inner and outer surfaces): 1.2mX12 (different protection for inner and outer surfaces)
200mm×10×3+9 pipe joints
200mmX3
Note: Except for the failure of marking inspection, which is classified as Class C failure, the failure of other items is classified as Class B failure. 8.2.3 Formulation of type inspection results
GB/T 14823.1—93
For the two cases a and b in 8.2.1, the number of samples for each type inspection of the conduit is shown in Table 11; if more than one sample fails in any inspection, the type test is judged to be unqualified. If only one sample fails in a certain test, this test and the tests affected by this test shall be repeated with another group of samples as specified in Table 11. All repeated test samples shall meet the requirements of this standard to be qualified; b. In case of c, d, e, and f in Article 8.2.1, the sampling method and result evaluation of the type test of the catheter shall be carried out in accordance with the provisions of GB2829, as shown in Table 12.
Yongping.
3 samples at a time
3 samples at a time
Class B unqualified quality level
RQL=65
8.2.4 The total number of type test samples (including secondary sampling), number of groups and test sequence are shown in Table 13. Table 13
Conductor type
Conductor without weld
Conductor with weld
Total number of samples
Total length 21m (internal and external surface protection
same):
Total length 28m (internal and external surface protection
different). 9 pipe joints
Total length 32m (internal and external surface protection
same):
Total length 46m (internal and external surface protection
different). 9 pipe joints
Number of groups
Main groups. The extra pipes are used as supplementary
or samples.
9 pipe joints with dry electrical continuity
Class C unqualified quality level
RQL=80
Test sequence
The first group shall conduct the test in the order of No. 1, 2, 3 in Table 5,
The second group shall conduct the test in the order of No. 6,7. The two tests of 4.5 and the other two tests of 8.2.5 shall be carried out respectively. If the test fails, the factory inspection and production shall be stopped. For the pipes that have been shipped out, the supply and demand parties shall negotiate to solve the problem. The new type inspection can be resumed only after the new type inspection passes. 9. Marking, packaging, transportation and storage 9.1 Packaging 9.1.1 Each batch of pipes delivered shall be accompanied by a quality certificate that meets the requirements of the order contract or product standard before packaging. The quality certificate shall indicate: Factory name: Type, specification, size and grade of the pipe; Metal name (material or model included); For steel pipes, the steel grade can be indicated; Standard number (or contract number); Test results of the pipes (including reference indicators); Stamp of the technical supervision department; Date of shipment.
The conduits are bundled in small bundles and then bundled into large bundles for delivery. Each small bundle is bundled at least four times horizontally. The strapping belt should be solid and reliable. 9.1.2
The end of the untightened pipe joint should be covered with a wire protector or wrapped with linen. The maximum weight of each small bundle is 100kg:
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