November 16, 2023
ForewordHi everyone, I'm Mr. Lin. Intelligent low current engineering equipment and materials must be submitted for inspection, so what materials should be submitted for inspection? What are inspection requirements? Today's article explains it completely. TextThere are many materials involved in a low current installation project, and acceptance work must be comprehensive and thorough. two parts: general and electrical methods AND so that everyone can refer to them and implement them in project.
Generic classOne
Pipe
► Welded pipe, galvanized pipe
1. Welded steel pipe: conform to national standard GB/T13793, hot dip galvanized pipe: conform to national standard GB/T3091.
2. The products are used in straight seam steel pipes for low pressure fluid transport and applications such as water, waste water, gas, air and steam for heating.
3. National standard product series:
Length: fixed length 6 meters/piece
4. Acceptance Method:
1. Appearance: wall thickness is same, there are no burrs, rust, bends on nozzle, whole package is intact.
2. Measurement: Measure wall thickness with a caliper and measure length with a tape measure. Measure weight with a scale or scale.
3. Test method: DN15-20 are selected for electrical wires and bent on site with a pipe bender.
4.Information requirements: The product quality certificate of relevant specifications is attached to vehicle.
► Seamless steel pipe
1. Seamless steel pipes: implementation of national standard GB/T17395.
2. Model and specification:
3. Acceptance Method:
1. Appearance: wall thickness is same, there are no burrs, rust, bends on nozzle, whole package is intact.
2. Measurement: Measure wall thickness with a caliper and measure length with a tape measure. Measure weight with a scale or scale.
3. Test method: random test.
4.Information requirements: The product quality certificate of relevant specifications is attached to vehicle.
Two
Profile
► Angle
1. Angle steel: implementation of GB9787 and GB9788 standards.
2. Model and specification:
Regular length of steel equilateral angle: #2~4 is 3~9m, #5~8 is 4~12m.
3. Acceptance Method:
1. Appearance: wall thickness is same, there are no burrs, rust, bends on nozzle, whole package is intact.
2. Measurement: Measure wall thickness with a caliper and measure length with a tape measure. Measure weight with a scale or scale.
3. Test method: random test.
4.Information requirements: The product quality certificate of relevant specifications is attached to vehicle.
► Steel plate
1. Steel plate: meet national standard GB708/GB709.
2. Model and specification:
3. Acceptance Method:
1. Appearance: Uniform wall thickness, no rust or kinks.
2. Measurement: Measure wall thickness with a caliper and measure length with a tape measure. Measure weight with a scale or scale.
3. Test method: random test.
4.Information requirements: The product quality certificate of relevant specifications is attached to vehicle.
► Channel steel
1. Channel steel: implementation of national standard GB/T707.
2. Model and specification:
3. Acceptance Method:
1. Appearance: no rust and deformation.
2. Measurement: Measure wall thickness with a caliper and measure length with a tape measure. Measure weight with a scale or scale.
3. Test method: random test.
4.Information requirements: The product quality certificate of relevant specifications is attached to vehicle.
Two electrical categoriesOne
Main material
► Flat galvanized steel
1. Galvanized flat steel: implementation of national standard GB/T2518.
2. Specifications and deviations
For flat products of fixed or double length, length tolerance must comply with following requirements:
Length≤4m—+30mm
Length>4～6m—+50mm
Length>6m—+70mm
The end of flat steel sheet must be cut straight, and cut must not exceed following limits:
Width of steel strip ≤100mm should not exceed 6mm;
Flat steel > 100 mm wide must not exceed 8 mm.
3. Acceptance Method:
1. Appearance: uniform wall thickness, no rust, delamination and obvious twisting, all packaging in good condition.
2. Measurement: Measure wall thickness with a caliper and measure length with a tape measure. Measure weight with a scale or scale.
3.Information requirements: The product quality certificate of relevant specifications is attached to the vehicle.
► PVC pipe
1. PVC pipe: implementation of national standard GA305.
Secondly, this product is usually used for pre-buried pipelines.
3. National standard product series:
Rigid PVC pipe
4. Acceptance Method:
1. Exterior inspection: inner and outer walls of pipeline must be smooth, without obvious defects such as bubbles, cracks and uneven color; Each batch of stamps must be marked with name of manufacturer, trademark or other identification marks, as well as model, outer diameter, length, number of performance standard; first mark should be about 50mm from end of pipe and then every meter should be on pipe Note. Everything is well packed.
2. Measurement: Measure wall thickness with a caliper and measure length with a tape measure.
3. Test method: DN16 or DN20 PVC pipe random inspection after pressure, impact and bending tests specified in GB/14823.2, there will be no visible cracks and damage on surface. Use a bent tube spring to check bending, and bending and flattening of pipe is in accordance with requirements.
4.Information requirements: Standard product requirements and relevant specification verification certificates are attached to vehicle.
► Bridge
1. Steel cable tray: meet national standard QB/T1453 and CECS31, aluminum alloy cable tray: meet national standard CECS108.
2.The product is made of steel or aluminum alloy and consists of pallets, straight sections of ladder frames, bends, accessories, supports, hangers, etc. This is a general term for continuous rigid structural systems used to support cables. .
3. Specifications and product models:
The standard length of solid frame of pallet and ladder can be divided into 2, 3, 4, 6 m;
Bending radii commonly used in mechanical engineering should be 70, 100, 150, 200, 300, 600, 900 mm. Purely straight bends should not be used.
The area of the ventilation holes at bottom of perforated tray must not exceed 40% of total area of the bottom.
The distance between centers of straight steps of ladder frame and 1/2 length of curved steps of ladder frame should be 200-300mm, and width of steps 20-50mm.
The hole position or welding position of support hanger, column and fixed bracket must meet requirements for center distance between layers of 200, 250, 300 and 350mm when pallets and ladders are installed in multiple layers.
Specifications and dimensions of various accessories and supports and suspensions should be determined according to axle series, provided that corresponding load is carried out.
Note. The thickness of sprayed or galvanized layer is not included.
4. Acceptance Method:
1. Appearance check: uniform wall thickness, no rust, no kinks, uniform surface coverage, no burrs, burns, hanging ash, scarring, partial voids (more than 2 mm in diameter) and other defects that should not affect appearance. installation tumor. The thread coating must be smooth and bolted connection must be screwable.
2. Measurement: Measure wall thickness with a caliper and measure length with a tape measure.
3. Test Method: A combination of spot and full inspection, surface layer should not be peeled off by scribing and crossing.
4. Information requirements: The vehicle is supplied with a certificate of conformity and a test report with relevant technical specifications.
► Metal hose
1. Metal hose: Conform to national standard YB/T5306.
Secondly, product is suitable for protecting wires.
3. Model and specification:
Right hand wound hose.
The length of hose must not be shorter than 3 m, and two short hoses are allowed per box.
4. Acceptance Method:
1.Appearance inspection: The surface of galvanized layer of sleeve must be intact and smooth, not to allow dezincification and black spots, and no more than three of following defects in a length of one meter (1 ) less than 5 mm long, deformed skin with a width of not more than 2 mm; (2) solid bubbles no more than 1/3 of circumference. The hose pitch must be flexible and flexible, while blockages and strong stretching, elasticity are not allowed; cracks and serious combing are not allowed at inner and outer joints of hose; cut marks are allowed on both ends of hose.
2. Measurement: use a caliper to measure inside and outside diameters and pitch; when hose is not deformed, bend hose into a circle and use a tape measure to measure diameter of inner ring, which is natural diameter of bend.
4. Information requirements: to have a certificate of conformity with the relevant technical conditions.
► Wires, cables
1. Wires and cables: implementation of JB/T10491, JB/T10438, JB/T10261 standards.
2. The product is suitable for power, communication and related transmission purposes.
3. Model and specification:
4. Acceptance Method:
1. Appearance check: surface of insulation must be even and uniform in color, core of insulated wire must be identified by color insulation or other suitable method, it must have solid marks with name of manufacturer, product model and rated voltage. cable. All signs must be legible.
2. Measurement: Use a caliper to measure wire strand diameter and use a 50m tape measure to measure actual length of wound wire.
3. Test method: random test.
4. Information requirements: certificate of conformity, 3C certification and inspection report completed.
► Lamps
1. Lamps: comply with national standards GB7000.1 and GB10682.
Secondly, this is a lighting fixture.
Third, lamps are classified according to type of protection against electric shock, degree of protection against dust, solid foreign bodies and water resistance, as well as materials of supporting surface.
4. Acceptance Method:
1. Appearance check: glass tube and phosphor layer of lamp must not have defects that affect lighting and use; connection between lamp base and glass tube must be strong; insulating parts of lamp are in good condition. condition without damage, signs are installed correctly, firmly, clearly, each light must be packed in a corrugated cardboard sleeve.
2.Measurement:Use general purpose measuring tools or limit gauges to check overall dimensions of lamp. The accuracy of diameter measuring tool should not be lower than 0.1mm, and accuracy of length measuring tool should not be lower than 0.2mm.
3. Test Method: Sampling, checking lamp performance and brightness on site.
4. Information requirements: certificate of conformity, 3C certification and inspection report completed.
► Junction box
1. Distribution box: use national standard GB7251.1.
Secondly, product is suitable for power circuit.
Third, junction box is mainly divided into power junction box and lighting junction box.
4. Acceptance Method:
1. Appearance: junction box is not damaged or deformed, electrical components are not defective. All types of signs are installed correctly, firmly and clearly, text and data on plate are correct, clear and complete, quality of structural elements, plating and coloring of hull is not violated;
2. Test method: complete inspection, checking compliance of electrical equipment components with system diagram according to drawings.
3. Information requirements: factory certificate, inspection report, 3C certification, complete accessories and certificate.
► Bus route
1. Busway: implementation of national standards JB/T10327, JB/T9662, JB/T8511, GB7251.2.
Secondly, product is suitable for power circuit wire slots.
Third, busbar trunking is mainly divided into fire-resistant busbar trunking, dense insulation busbar trunking and air-insulated busbar trunking.
4. Acceptance Method:
1. External inspection: busbar is not damaged or deformed, installation of various signs is correct, solid and clear, text and data on plate are correct, clear and complete, quality of structural structures, coatings and paint of hull is not damaged;
2. Test method: full test.
4. Information requirements: Factory certificate, inspection report and 3C certification completed.
► Switches, sockets, junction boxes
1. The switch panel, outlet panel and junction box comply with national standard JB/T8593.
2. The product is suitable for electrical accessories with a rated voltage not exceeding 440V AC and a rated current not exceeding 32A for domestic and similar environments.
3. Model and specification:
The wall thickness of metal junction box is at least 1 mm, thickness of plastic insulation junction box is at least 2.5 mm, thickness of plastic fasteners is at least 8 mm.
4. Acceptance Method:
1. Visual inspection: The surface of insulation and composite panels should be free of air bubbles, cracks, material defects, blisters, obvious scratches, burrs, deformations, depressions, mottled spots and other defects. The surface of plastic box must be free from defects such as bubbles, cracks, lack of material, obvious deformation, dents. The metal box must have a metallic sheen, uniform color (except for galvanized and varnished), not have obvious defects in form of scratches, burrs, deformations, dents. The switch socket panel mainly depends on thickness of copper sheet and quality of copper.
2. Measurement: Measure wall thickness with a caliper, measure length, width and height with a ruler.
3. Test method: inspect samples, squeeze two sides of plastic box by hand to make sure it is strong, and check if material is strong. Is the metal box durable by hand.
4.Information requirement: Factory certificate and 3C certificate completed.
► Lamp holder
1. Lamp holder: implement national standard GB19651.1.
2. Model and specification:
It is divided into one-piece plastic lamp holder, round wooden table, lamp holder and other shapes.
The base size has a diameter of 80, 100, 120, etc.
3. Acceptance Method:
1.Appearance inspection: The surface must be smooth and even, without air bubbles, cracks, marks and depressions, intact and without defects.
2. Measurement: measuring with a ruler.
3.Test method: random test, use a lighter to burn plastic base, if it is an open flame (burning), it does not meet requirements.
4.Information requirements: product quality certificate must specify the requirements for fire resistance characteristics.
► Fire Pack
1. Refractory packaging: implementation of national standard GA161.
2. The product is used for sealing cable openings and erecting fireproof walls. Suitable for temporary fire separation in places where cables are frequently replaced and during construction.
3. Acceptance Method:
1. External examination: package body is intact, without damage, interior materials without visible changes;
2. Measurement: Measure weight with an electronic balance or balance.
3.Test method: sample test, high place falls freely on concrete flat surface, and package body is not damaged. After contact with water and oil, inner material has no visible changes, and package body is intact and undamaged.
4.Information requirement: Factory certificate and 3C certificate completed.
Two
Auxiliary materials
► Waterproof tape
1. Insulating tape: conform to national standard SJ/T9167.12.
2. The product is suitable for electrical insulation when connecting or twisting wires and cables.
Third, waterproof tape is divided into thermoplastic tape and rubber tape.
4. Acceptance Method:
1. Appearance check: packaging is in order, no damage, center mark on paper core is clear and complete.
2. Test method: random test. The expansion of waterproof tape is very slow and average speed is approximately 50 mm/s. When tarp is first unrolled, it should not stick together and come off too much.
3.Information requirements: Factory certificate completed.
► Welding rod
1. Welding rod: use national standard GB/T10044.
2. Model and specification:
4. Acceptance Method:
1. Appearance check: The surface must be smooth and even, free of cracks, marks or depressions, and must be complete and free from defects.
2. Measurement: Measure size with a caliper.
2. Test method: random test.
3. Information requirements: Certificate of Conformity.
► Crimp cap
1. Wire crimp cap: use national standard GB14048.7.
2. Model and specification:
3. Acceptance Method:
1. Appearance check: The surface must be smooth and even, free of cracks, marks or depressions, and must be complete and free from defects.
2. Measurement: Measure size with a caliper.
3. Test method: random test.
4. Information requirements: Factory certificate, inspection report and 3C certification completed.
