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First, the difference between flame-retardant cables and fire-resistant fire-resistant cables For flame-retardant cables, we require the IEC-332-1-2-3 standard at minimum, and the corresponding specification for fire-resistant and fire-resistant cables is IEC-331. The contents of the two assessments are different. Refer to Tian Chuanguo, “The Basic Knowledge of Wire and Cable”. Fire-retardant cables were produced in Shanghai Cable Research Institute and Wuxi Special Cable Factory in the 1980s,...
Basic knowledge of cable selection The most commonly used in the wiring of the anti-theft system are signal transmission cables and power transmission cables. Due to the number of detection points, different detection methods, different transmission methods, different power requirements, etc., select the matching cable according to the actual situation Is the key to the overall system. The application of cables in the monitoring system has the most specifications of the models, different...
The emergence of a common cable TV monitoring transmission equipment not only provides a high-quality and low-cost solution for multi-channel monitoring signal two-way broadband synchronous transmission, but also completely changes the traditional monitoring spider network star structure wiring. The emergence of a common cable TV monitoring transmission equipment not only provides a high-quality and low-cost solution for multi-channel monitoring signal two-way broadband synchronous...
The streaming media video service Hulu and the US cable TV service provider Cablevision issued a joint statement today. The two will cooperate and Cablevision will provide Hulu's video content to its viewers. This means that Hulu has infiltrated traditional television from an Internet-based streaming service. Cablevision is the first television operator to achieve such cooperation with video streaming media. This statement is not clear enough. Many specific details are currently not...
Video sites have gradually phased out cable TV, which is no longer news. Many young people choose on-demand TV dramas instead of waiting on the couch for regular broadcasts of TV channels. However, the video website's pressing for cable TV is furthering. Some video service providers in the United States began to introduce high-quality live TV channels at a lower rate than cable TV. American media pointed out that online video is "cable television". In other words, the replacement...
With the maturity of the home broadband environment and the richness of the network's film resources, home entertainment based on the Internet is gradually emerging. We only need an Internet set-top box device to watch the TV programs we ask for. On the other hand, in terms of cable TV, the triple play that has been advocated for many reasons cannot be achieved due to various reasons, and the proliferation of advertisements has seriously reduced our enthusiasm for watching. However, we...
Under the impact of the Internet users' original video and copyright video (film TV drama) website, traditional cable and satellite TVs are facing a crisis of user loss. More and more young people have never registered cable television services. Obviously, in the face of changes in user habits, these service providers can only make changes. Recently, the United States’ largest cable network operator and media giant Comcast Corporation officially launched an online video service. It will...
At present, the specifications, materials, structures, insulation properties and test methods of fire-resistant cables produced in China all comply with the international IEC3328 standard. Flame retardant cable is widely used in production practice. Cable fire accidents are significantly reduced. People use this kind of cable more safely. It ensures the safe operation of the power grid and has obvious economic and social benefits. Therefore, everyone in the community has added trust to it. It...
Types and Judgment of Cable Faults Whether it is high-voltage cable or low-voltage cable, it is often caused by short circuit, overload operation, insulation aging or external force during construction, installation and operation. Cable fault can be summarized as grounding, short circuit, broken three categories, the main types of failure in the following areas: ① three-core cable one or two core grounding. ② two-phase short circuit between the wires. ③ three-phase core completely short...
The latest version 3.0 of the USB Powered (USB PD) standard introduced by the USB Developers Alliance (UBS-IF) will enable power adapters, mobile power and charger manufacturers to develop new products for new consumer devices such as laptops, tablets and mobile phones. wave. The USB PD 3.0 via USB Type-C connector can be used to increase the power rating of the USB interface from 7.5 watts to a maximum of 100 watts using a maximum of 20 volts / 5 amps. With the introduction of USB PD 3.0, it...
1) Video cable: The distance from the camera to the monitoring host is ≤ 200 meters, and the RG59 (128 series) video cable is used. The distance from the camera to the surveillance host is >200 meters and the SYV75-5 video cable is used. →Related Links: Civil Wire and Cable Purchase Knowledge 2) PTZ control line: PTZ and controller distance ≤ 100 meters, with RVV6 × 0.5 sheath line. The distance between the gimbal and the controller is more than 100 meters and the RVV6×0.75 sheath cable is...
Recently, L-com Global Connectivity ("L-com") announced the launch of a new line of IP67 industrial grade USB 3.0 cable assemblies and couplers for demanding industrial and military communications applications. These new industrial grade USB 3.0 cable assemblies are specially equipped with ferrules that are resistant to moisture and other contaminants, up to IP67. Other product features of the U3A00058 series include the use of dual shielded cables for maximum EMI/RFI interference protection....
The power cable is used to transmit and distribute the large-functional power in the main line of the power system, and the control cable transfers the power directly from the power distribution point of the power system to the power connection lines of various appliances and appliances. The rated voltage of the power cable is generally 0.6/1kV and above, and the control cable is mainly 450/750V. When power cables and control cables of the same specifications are manufactured, the insulation...
Most people can easily confuse the concept of flame-retardant cables and fire-resistant cables. Although flame-retardant cables have many advantages that are more suitable for chemical companies, such as low-halogen, low-smoke and flame retardant, in general, fire-resistant cables can replace flame-retardant cables. Fire-retardant cables cannot replace fire-resistant cables. The main difference between them is: The difference between 1 principles The principle of fire-resistant cable and...
China is a country lacking in copper resources. With copper heavily relying on imports, people in China have long been looking forward to having a new type of conductor material to replace the scarce copper conductor material. It can be said that the idea of "popularizing aluminum alloy cables with aluminum" has long been expected by the Chinese people for years. As the technology advances, it is possible to realize this. The advanced conductor aluminum alloy technology solves the defects and...
The difference between non-standard cable and national standard cable The national standard cable is 100±0.5 meters/volume, and the corporate standard cable is 80-85 meters/volume. Some small factories have even shorter ones. 1, look at the appearance of the cable See if there is a quality system certification; see whether the certificate is standardized; see if there is a factory name, site, inspection seal, and production date; see whether the trademark is printed on the wire, specifications,...
Whether it is the SARFT in charge of the world's domestic market, or the overseas pattern dominated by the market economy, the continuous development and expansion of the online video broadcast platform is stepping up to the inherent position of traditional cable TV and the proportion of users. Especially after the rise of CNTV, Mango TV and other Internet platforms under the broadcasting system, and the recent launch of the online broadcast channel by HBO in the United States affecting cable...
In the recent two decades of development in the field of science and technology, USB has played a pivotal role. For example, in terms of data transmission and power consumption, it affects our lives to a large extent. Coupled with the popularization of USB Type-C technology, USB is once again promoted. On the cusp of the storm. For this reason, this article focuses on introducing the basic working principle, development history, and some characteristics of USB3.1 and Type C, and I hope it will...
Recently, YouTube's commercial director Robert Kyncl raised a lot of attention at the CES. He said that digital video has been gradually replaced by television, and this process "will take place in the next decade." The emergence of each generation of new media is accompanied by the decline of the previous generation of media. But so far, no old media has actually withdrawn from the stage of history. Just like bamboo slips, it is just a paper book today. Today's TV will disappear as Kyncl said?...
Anatomical comparison rules: find 3 different brands in the market for anatomy, and choose a product structure that is relatively good. Compare the brand 3 + 6 line with Changming ’s VGA3 + 6 line. The structural gap is staggering. Comparison of the anatomical results of Ming ’s VGA3 + 6 line: The center conductor of the three primary colors (red, green, and blue) of the long nameplate 3 + 6VGA line is a 0.35mm tinned copper wire (approximately line 26), and other brands are 7 0.10 bare copper...
Visual identification: 1. PVC sheath: The surface can see the regular "unevenness" of the knitting inside, indicating that the processing technology is good and there will be no relative sliding, which is a good cable. The appearance is smooth, and the "unevenness" of the compressed braid is not visible. The jacket is loose when it is pinched by hand, which is a poor cable; 2. Check the shield layer network: is the number enough? Copper braid, check solderability, tinned...
How to distinguish the quality of the video cable Central issues: Visual appearance identification of the video cable Visual performance identification of the video line: 1. PVC sheath: The surface can see the regular "unevenness" of the braided mesh inside, indicating that the processing technology is good, and it will not produce relative sliding, which is a good cable. The appearance is smooth, the "unevenness" of the compressed braid is not visible, and the jacket has a...
This is an engineering problem that seems to be “not a problem” but important; the actual testing also requires specialized equipment and instruments. These devices and instruments are not available in design and engineering units. Engineering to identify the quality of the video line, I hope everyone brainstorming. Here to talk about a few points, throwing bricks to attract jade: 1) visual appearance identification: 1. PVC sheath: the surface can be seen to press the inside of the net has a...
With the increasing height of modern buildings, the application of elevators is becoming more and more frequent. For safety reasons, there will be video installations in the general elevators for property security management. In order to operate the video normally, video is required. The line is connected to the power port, and the elevator is a device that is moving up and down at any time. How to install the video cable? Today Xiaobian takes you to learn and learn! Elevator video cable...
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.