source:Company News Popular:adapter release time:2021-06-07 10:10:28 Article author:sznbone
Cables, known as the blood vessels and nerves of the national economy, are related to the safety of the transmission of information and communication, the operation of industrial minerals, and the operation of railway traffic. They are inseparable from people’s production and life. The order of life has a huge impact. Therefore, our country attaches great importance to the construction, operation and maintenance of cables. However, the current quality of domestic wires and cables is worrying. So, don't worry about how cheap the cables are. First, check if there are any of the following common test items?
1. Electrical performance testing
Mainly there are conductor DC resistance, insulation resistance, finished product voltage test and insulated wire core voltage test, each of which is very important. Conductor resistance directly reflects the electrical transmission performance of the cable, and directly affects the temperature, life, voltage drop, and operational safety of the cable during energized operation. It mainly examines the material and cross-sectional area of the conductor. If the material of the conductor is not good or the cross-sectional area is serious Insufficient, it will cause the conductor DC resistance to seriously exceed the standard.
Insulation resistance, finished product voltage test and insulated wire-core voltage test all examine the electrical insulation performance of the cable insulation layer and sheath layer. Insulation resistance is to detect the resistance of the insulating material between two conductors. It should be large enough. To insulation protection.
2. Mechanical performance testing
The main purpose is to examine the tensile strength and elongation at break of insulation and sheath plastic materials, including before and after aging, as well as the bending test, bending test, load breaking test, insulation core tearing test for finished flexible cables, Static torsion test, etc. Tensile strength before and after aging, elongation at break before and after aging are the most important and basic indicators of cable insulation and sheath materials. It is required that the materials used for cable insulation and sheath have sufficient tensile strength and are not easy to break. It must also have a certain degree of flexibility.
In addition, since flexible cables are not fixedly laid, there are repeated pulling and bending during use. Therefore, the standard for flexible cables additionally stipulates that dynamic bending tests, bending tests, load breaking tests, and insulated cores should be added to the finished cables. Tearing test, static bending test, etc., to ensure that this cable meets the requirements in actual use.
3. Performance test of insulation and sheath materials
Including thermal weight loss, thermal shock, high-temperature pressure, low-temperature bending, low-temperature stretching, low-temperature impact, flame retardant properties, etc., these are all tests for the performance of insulation and sheath plastic materials. The flame retardant performance of the cable is very important. The test to examine this performance is the non-flame test, that is, the finished cable installed according to the standard is ignited with a special flame for a certain period of time, and the flame of the cable is checked after the flame is self-extinguished. , Of course, the less burnt part, the better, which means that its flammability is poor, its flame retardancy is good, and the safer it is.
4. Logo inspection
The standard requires that the cable packaging should be accompanied by a label or logo indicating the product model, specification, standard number, factory name, and place of origin. Specifications include rated voltage, number of cores and nominal conductor cross-section, etc.; the surface of the cable should be printed with continuous signs of the manufacturer's name, product model and rated voltage, and the spacing of the signs should be ≤200mm (insulation surface) or ≤500mm (sheath surface), The content of the mark should be complete, clear and scratch-resistant. This requirement is to facilitate the user to understand the cable model specification and voltage level to prevent laying errors.
Read recommendations:
24V21A LED Power Supply 24V Power Supply 21A Power Supply
ER42 High Frequency Transformer
EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter
What are the factors that affect the safety performance of power cord plugs
Popular recommended products
200-500W Switching Power Supply
2020-08-2924-65W Switching Power Supply
2020-08-2912V2ASwitching Power Supply
2020-08-28MKD-571202000 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28MKA-571652420 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-28EI-66 ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28EI-57 ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter INTERCHANGEABLE ADAPTOR Li
2020-08-28EI-48 ADAPTER LINEAR ADAPTOR Switching Power Adapter INTERCHANGEABLE ADAPTOR Linear Adapter
2020-08-28EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter
2020-08-28EI-35 ADAPTER AC ADAPTER SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28ER42 High Frequency Transformer
2020-08-2712-36W POE POWER SUPPLY
2020-08-27Transformer,Power Transformer,Ring Power Transformer
2020-08-27Transformer,High Frequency Transformer,Frequency Transformer
2020-08-2712-24W Medical Switching Power Supply
2020-08-273-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply
2020-08-2745W PD Charger,45W Charger,PD Charger
2020-08-2736-90W Charger,36W Charger,90W Charger,40W Charger,50W Charger
2020-08-2724W USB Charger,24W Charger,USB Charger
2020-08-2724W 2USB Charger,24W Charger ,2USB Charger
2020-08-2710-24W Charger,24W Charger,10W Charger
2020-08-2730-500W LED Power Supply 30-500W Power Supply
2020-08-27Related Information
Cable tell you the importance of cable inspection
2021-06-07What is a power cord?
2021-06-04What are the power cord specifications?
2021-06-04The difference between power cord and American power cord plug
2021-06-03What is the national standard power cord?
2021-06-03power cable
2021-06-02What are the factors that affect the safety performance of power cord plugs
2021-06-02What problems should be paid attention to when purchasing plugs and sockets
2021-06-01What types of power cord plugs can be divided into
2021-06-01How to customize the power cord
2021-05-29How to judge the quality of the power cord plug
2021-05-29What are the factors that cause the price of power cord plugs to be unstable
2021-05-28Analyze what are the problems in the power cord plug market today
2021-05-28Power cord voltage of plugs in various countries
2021-05-27How to connect the three-plug power cord
2021-05-27What are the precautions for connecting the three-plug power cord
2021-05-27What are the main application areas of waterproof transformers and waterproof transformers?
2020-07-02What is the basic composition of a switching power supply?
2020-07-02Why is the isolation transformer safe?
2020-07-02What are the safety requirements for control transformers?
2020-07-02Popular recommended products
EI-57 ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter INTERCHANGEABLE ADAPTOR Li
2020-08-283-100W PCBA power supply 3-100W Customized power supply 3-100W power supply
2020-08-27MKS-1202000-36 Switching Power Supply
2020-08-2930W PD Charger,30W Charger,PD Charger
2020-08-2718-25W Switching Power Supply
2020-08-2824-65W Switching Power Supply
2020-08-29EI-66 ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28100-300W Charger,100W Charger,200W Charger,300W Charger
2020-08-2724W USB Charger,24W Charger,USB Charger
2020-08-27MKD-571202000 ADAPTER AC ADAPTER CE ADAPTOR UL ADAPTOR Linear Adapter
2020-08-283-15W Switching Power Supply
2020-08-2824W 2USB Charger,24W Charger ,2USB Charger
2020-08-273-12W Medical Switching Power Supply 3W Switching Power Supply 12W Power Supply
2020-08-27MKS-1401700H Switching Power Supply
2020-08-29MKS-1203000EX Switching Power Supply
2020-08-2945W PD Charger,45W Charger,PD Charger
2020-08-2712-36W POE POWER SUPPLY
2020-08-2724-36W Charger,36W Charger,24W Charger,30W Charger
2020-08-27EI Power Transformer Power Transformer
2020-08-27EI-41 ADAPTER AC ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Adapter
2020-08-28500W Charger,Charger
2020-08-28MKS-120200EU-36 Switching Power Supply
2020-08-293-8W Charger,3W Charger,8W Charger,4W Charger,5W Charger,6W Charger,7W Charger
2020-08-2712W POWER SUPPLY,12W CAR POWER SUPPLY,POWER SUPPLY,CAR POWER SUPPLY
2020-08-2712VDC8A 96W power supply
2020-08-28ER42 High Frequency Transformer
2020-08-27EI-28 AC ADAPTER LINEAR ADAPTOR Linear Power Adapter Switching Power Adapter Linear Adapter
2020-08-28Transformer,High Frequency Transformer,Frequency Transformer
2020-08-2736-65W Switching Power Supply
2020-08-29MK-C1806028 MKA ADAPTER LINEAR ADAPTOR SWITCHING ADAPTOR Linear Power Adapter Linear Adapter
2020-08-28