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The difference between LSZH flame retardant and UL flame retardant standards

With the advent of the era of big data, network informatization has become increasingly popular, and the integrated wiring system has transformed from a new invention 20 years ago to an information system transmission cable that can be seen everywhere in people's daily lives. At the same time, the integrated wiring system will more or less produce harmful gases and smoke in the flame, and may also help the fire gradually spread to other floors or other rooms. According to the statistics of the fire department, about 85% of deaths in fires are caused by poisoning by harmful gases generated in the fire, suffocation by diffuse smoke, or inability to escape due to invisible paths. In buildings, the number and spread of integrated wiring cables exceeds that of various cables in buildings. Therefore, the fire protection of integrated wiring systems has begun to become one of the key considerations for system performance.   The formation of two long-standing concepts for fire safety: In the past 34 years (1987-present), the halogen-free flame retardant system has gradually entered Europe and has been accepted as a part of cable manufacturing technology. This is not the case in the United States, which is generally limited to products sold back to Europe.   Europe and the United States have completely opposite views based on different national conditions and backgrounds: The concept circulated in the United States believes that the root of the disaster lies in the production of carbon monoxide (CO) gas and the subsequent flashover ("flashover") process of CO converted to CO2 heat release. Therefore, if the heat release of the process can be controlled by some methods, the fire hazard can be reduced. This is the prospect of the birth of UL flame retardant, so the outer sheath of UL flame retardant system cable still uses PVC material, and whether it is CMX CM or CMR, even CMP only regulates the concentration of smoke generated by combustion, but still Separate the toxicity. (CMX CM CMR CMP flame retardant specific standards, please search "UL flame retardant CM/CMR/CMPD grade and LSZH network cable")   European tradition has always believed that the severity of the disaster depends on the success rate of people leaving the fire scene. The irritation and toxicity of the smoke are the main factors restricting the escape from the fire scene. Therefore, priority attention should be given to smoke, toxicity, and corrosion generated during combustion. In other words, it is imperative to completely abandon the production and use of halogen substances. This led to the definition of LSZH.

2021

07/01

What matters should be paid attention to in network room integrated wiring?

In building network computer system, to facilitate the building environment and unity and coordination of circuit layout, decoration and wiring please as far as possible with a number of construction workers, decorate with the wiring of inclusive design, easy to integrated wiring network computer room operations, and later maintenance cleaning, equipment wiring structure, can also be more compatible with decorate scene, make the wiring more clean and tidy.So what should we pay attention to in the network room integrated wiring? 1.Select the appropriate cable length.In order to avoid winding and chaos caused by the extra cable length, choose the appropriate cable length.   2.Fiber optic testing.Fiber wiring must be tested before the test is successful before use, to avoid rework due to the fiber can not be used.   3.Note the fiber bending radius.When using optical fiber jumper, do not bend the bending radius of optical fiber jumper beyond the minimum bending radius of optical fiber cable.   4.Avoid end face contamination.In optical fiber wiring to ensure that there is no debris, ash layer and oil on the end surface of the cable pollution.   5.Fiber optics and copper cables must be wired separately.As the copper cable is heavier, it will crush the optical fiber, so it must be separated when wiring.   6.The cable density is the same.The cable density should be the same all the way to the terminal when wiring the horizontal subsystem and trunk subsystem.   7.Keep the cable with enough room to dissipate heat.As the cable works for a long time to get hot, there needs to be enough space for heat dissipation to avoid fire.   8.Use labels for cables.Labels on cables can clearly mark the position of cables, making the wiring environment more clear, and simplifying modification and addition operations.   The above is all the content of the network room integrated wiring attention, in fact, a reasonable and effective cable layout for energy saving, energy saving and consumption reduction plays an important role.Now there are two main construction situations in the computer room, one is centralized wiring, the other is two-level cable management, mainly refers to the network switch.

2021

04/26

What does residential area cabling project basically include?

Residential cabling project mainly consists of panel and socket module.The sockets installed in each home room can choose different types of modules, such as category 5 modules, TV modules, optical fiber modules, audio-visual modules, etc.In addition, different types of panels can also be selected according to needs, such as British, American, type 86, single, double, three, four mouth panels.   The general cabling project in the horizontal area of the residential area mainly consists of various cables.According to 570A standard, different wiring media are used for different applications.Category 3 and Category 5 unshielded twisted pair cables are used for the voice system, which can meet the ANSITIA/EIA standards. However, Category 5 cables are recommended.Why are category 5 cables recommended here?Five UTPs that meet the ANSITIA/EIA-586A standard are used for data transmission.When the communication bandwidth or anti-interference requirements are high, optical cable can be used as the transmission medium.The video signal transmission adopts 75ω coaxial cable conforming to SCTEEPS-SP-001. The coaxial cable does not need expensive adapter, which can meet the requirements of users for broadband and save the investment of users.   Residential management area cabling project is mainly composed of different series of installation modules.It is the wiring center of the system.Equipped with high-speed, high-quality cabling modules and cable jumpers, it can provide voice, data, security, image and video applications for different homes.All services are provided through a communication socket/panel connected to each room, while the distribution center can collect indoor and outdoor sound, data, image signals, and can simply connect with telephone, computer, fax machine, TV and other related equipment. And for the family wiring center is generally in each floor corridor has a unified distribution box, the installation location can be based on the planning of the entire residential area and the external route in and out.Users can choose different specifications of cable distribution boxes and configure different functional modules according to the types and needs of households.   The main optional components of the wiring center include: 1. Module board: telephone module board, class 5 module board, 110 distribution frame, video distributor, monitoring and alarm module, etc. 2, jumper: class 5 jumper, coaxial video jumper; Equipment: Ethernet hub and video amplifier.   For multi-storey residential buildings, in addition to the above work area, level area and management area, the lines of each residential unit shall be connected to the main area of the building management center and the supervisor area of the entire building line system. The building uses a star topology, with UTP and 75 ω coaxial cable used.The level of cabling depends on the situation. Whichever level of scheme is used, the cabling box of the multimedia cabling system is required in the residential user. The cabling box within the home can be connected to the middle cabling box of the building and the main cabling frame of the residential area.According to the different integrated cabling planning of the community, you can choose 1-2 unshielded twisted-pair and 1-2 75ω coaxial cable into the home.The alternative main line routing scheme provides intermediate routing boxes for each staircase unit or building.   For the residential main line, an intermediate wiring can be set up in each building, and then the main wiring management center of the residential area can be connected through the main lines between the buildings.Optical fiber is usually recommended for data transmission, large-log UTP for voice transmission, and 75-ohm coaxial cable for video transmission.The main wiring is generally located in the residential property management center.According to different applications, copper cable connection frame, coaxial cable hybrid connection frame and optical cable connection frame can be selected.

2021

10/05

Optical fiber wiring system

Optical fiber wiring   The optical fiber of integrated wiring is a general term for light guide, which is generally used for the subsystem of integrated wiring building group or vertical trunk line subsystem. It is composed of fine glass fiber filaments with a diameter of approximately 0.1 mm. Because of its wide transmission frequency band and large communication volume, especially not affected by interference signals, it is favored by the company’s local area network integrated wiring.   Fiber selection 1,Select based on performance test plan. Optical fiber can be divided into single-mode (SMF) and multi-mode optical fiber (MMF) according to the transmission mode of light. The core diameter of the multimode optical fiber is 50 or 62.5μm, and the diameter of the insulating layer is 125μm, which is expressed as 50/125μm or 62.5/125μm.   2,Selected according to the specification level Because traditional multi-mode optical fiber is only suitable for 10 Gigabit transmission for tens of meters, new optical transceivers selected for mutual cooperation with 10 Gigabit use, ISO/IEC 11801 has formulated a new multi-mode optical fiber specification level   3,Consider the selection from high cost performance The working wavelength of the optical fiber includes medium and short wave 850nm, long wave 1310nm and 1550nm. Fiber loss generally decreases with the increase of optical wavelength, and the loss at 850nm is generally 2.5dB/km   4,Select according to the natural environment of the application If the transmission distance is within 2km, multi-mode fiber can be selected, and wireless relay or single-mode fiber can be used for more than 2km. When using optical fiber used in housing construction, pay attention to its flame retardancy, toxicity and smoke characteristics.   Fiber optic cable laying   *What is guaranteed is that specialized technical personnel who have received rigorous learning and training should carry out the connection and maintenance of the optical fiber   *Must have a very complete design plan and engineering drawings to facilitate engineering construction and future inspections, convenient and reliable   *When the optical fiber is about to turn, the turning radius of the road should exceed 20 times the diameter of the optical fiber itself. When the optical fiber passes through the wall or the building, a plastic hose with a protective mouth must be added   *When optical fiber is used in the Internet, at least 6-core fiber optic cable must be used in each building wiring room, and it is best to use 12-core fiber optic cable for advanced applications.   *The most important thing for the long-distance fiber laying is to choose a suitable route.

2021

08/08

About Copper cabling system

The copper cabling system is suitable for the occasions with high configuration standards in the office integrated cabling system, using optical cables and copper core twisted-pair cables to form a hybrid network. The configuration of the integrated office cabling system should be based on the basic and enhanced office cabling system to add fiber optic cable systems.   It is suitable for the occasions with higher configuration standards in the office integrated wiring system, and uses optical cables and copper core twisted-pair cables to form a network. The configuration of the integrated office cabling system should be based on the basic and enhanced office cabling system to add fiber optic cable systems. The rationality of the design of the office’s integrated wiring system directly affects the standard implementation of the entire system. The number and location of information points, the routing of strong and weak current lines, and subsequent maintenance should be planned in advance to ensure the office’s integrated wiring system. It is durable and practical.   Specifications for copper cabling   1,Cable length The copper cable used for water wiring should not exceed 90m; when choosing the length of the wiring cable, be sure to pay attention to the cable is not the straight line distance from the distribution frame to the wall socket panel, but the full routing distance along the pipeline.   2,Cable connection T568-A and T568-B, there is no substantial difference between the two, only the difference in color. These two specifications cannot be mutually used in a copper cabling system, and a copper cabling system software can only select one network cable connection specification.   3,Elements to be considered before copper cabling Before deploying copper cables, we must first carry out overall planning, such as where there must be how many copper cables, whether wire ducts or conduits must be used for copper cable wiring, and whether copper cables will cause serious environmental pollution at high temperatures or organic chemicals These are destroyed in the natural environment, so pay attention to maintaining copper cables when deploying.   Attention should be paid to the construction. 1,Unless it is necessary, do not remove the twisted structure of the Category 5 twisted pair in the copper cable at any time 2,The cable is not long enough not to overlap like normal power wires 3,Application compatible with copper cable RJ45 connector, copper cable distribution frame and wall socket panel, etc. 4,If the copper cable is damaged, there is no need to try to repair it according to the patchwork method, and the new copper cable should be replaced immediately 5,When connecting the RJ45 network cable crystal plugs on both sides of the copper cable, only a small part of the outer sheath on both sides of the copper cable needs to be removed (generally no more than 3 inches)   Integrated wiring products

2021

08/08

How to choose suitable for their own enterprise security monitoring?

With the rapid development of modern society and economy, enterprises have improved their awareness of security prevention, and more and more enterprises or factories have installed surveillance cameras. However, many customers do not know how to choose the safety and security monitoring system suitable for their own enterprises or factories, and sometimes the price is the only evaluation standard. But in fact, in the installation of security monitoring system, is to meet the needs of users on the basis of comprehensive prevention as the standard, so, you know how to choose suitable for their own enterprise security monitoring?   First, ask about the price.What problems need to be solved to install this security monitoring system?Whether can solve the realization of the factory, anti-theft, look at the staff and so on.When asked, these problems are explained, and the service provider can recommend specific design solutions to you.   Second, choose which brand is better;In fact, the most common domestic brands are deep conviction, Dahua and so on.From the point of view of security monitoring, the enterprise security monitoring system had better choose a good brand, because the good brand products, its safety, after-sales service and product quality is high, product technology is also advanced.   Third, select the monitoring pixel;At present, in the security monitoring system industry, the pixel of the monitoring camera can fully meet the visual effect of the enterprise factory monitoring system.Learn more about communication and recommend the installation of enterprise factory security monitoring users, it is best to take time and professional security engineers to go to the site investigation, so that not only communication is more convenient, the plan will be more close to the actual needs, but also can choose the security monitoring system suitable for their own enterprises.   The above is how to choose the relevant content of the safety and security monitoring system for enterprises.Hope to help you with your choice.Want to know more security monitoring information, can telephone or online consultation.  

2021

04/26

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