In recent years, China's rapid economic development has greatly promoted the expansion and development of the wire and cable industry. The large demand in the market has led to the rampant use of counterfeit and shoddy products, resulting in many personal and property safety accidents. In order to improve the product quality of wires and cables, ensure the safe operation of the power system, and accelerate the stable development of the national economy, it is necessary to have comprehensive testing projects and scientific testing methods. According to the "Code for Acceptance of Construction Quality of Building Electrical Engineering" (GB 50303-2002), all raw materials, finished products, semi-finished products, equipment, etc. used in building installation engineering must undergo careful and meticulous quality inspection upon entry, and relevant records must be filled out to confirm compliance with the regulations before they can be applied in construction
1 Finished product inspection of wires and cables
The finished product inspection of wires and cables is mainly divided into three types of inspection items: appearance size and structure inspection, electrical performance inspection of wires and cables, and mechanical performance inspection of wires and cables.
Appearance size and structure inspection of wires and cables
Appearance size and structure inspection of wires and cables is the first inspection item of wire and cable quality control, which can be divided into: appearance inspection, size inspection, and structure inspection.
Appearance inspection
The appearance inspection of wires and cables is to ensure that their surface is round and smooth, without defects and impurities such as burrs, cracks, spots, oil stains that affect normal operation, and to ensure that their corrosion and oxidation degree meet the requirements.
Size detection
Size detection includes related tests such as outer diameter, thickness, eccentricity, sector height, pitch, cross-section, and density.
. Sampling is required to test the thickness of the insulation layer and the diameter of the wire diameter. The sampling method should take a sample of a section of wire at least 3 places with an interval of 1 meter, and then measure it with a micrometer. The insulation layer thickness of various wires and cables should not be less than relevant regulations, and the diameter error of various wire diameters should not be less than 1% of the nominal diameterStructural inspection
The structural inspection of wires and cables can be divided into section inspection, sheath inspection, cable core structure inspection, and insulation core inspection.
. Structural inspection is actually a final inspection that combines appearance inspection and size inspection, ensuring that there are no defects in the appearance and that the size is roughly correctFunction of testing report:
1. Project bidding: Issue authoritative third-party CMA/CNAS qualification report
2. Online e-commerce platform entry: Quality inspection report recognized by major e-commerce platforms 3. Used as a sales report: issuing legally effective testing reports to make consumers more confident 4. Papers and research: Provide professional personalized testing needs 5. Judicial services: providing scientific, fair, and accurate testing data 6. Industrial problem diagnosis: Verify the troubleshooting and correction of industrial production problemsBaijian and testing process:
1. Telephone communication and confirmation of requirements
2. Recommend solutions and confirm quotations 3. Mail samples and arrange testing 4. Progress tracking and result feedback 5. Provide reports and after-sales service 6. If urgent or priority processing is requiredTesting and testing characteristics:
1. The testing industry is fully covered, meeting different testing needs
2. Fully cover the laboratory and allocate localized testing nearby3. Engineers provide one-on-one services to make testing more accurate
4. Free initial testing, with no testing fees charged
5. Self service order delivery for free on-site sampling
6. Short cycle, low cost, and attentive service 7. Possess authoritative qualifications such as CMA, CNAS, CAL, etc 8. The testing report is authoritative and effective, and is generally used in China