Do you know the uses of pre-branch cables?
Prefabricated branch cable is a new type of power supply line system. In many cable use occasions, the joint processing of main cable and branch cable has become a prominent problem in the construction of supply and distribution network lines. The traditional wiring method is in the construction On-site production, due to cumbersome production and high technical requirements, causes a series of problems such as high construction costs, high conductor contact resistance, and difficulty in ensuring insulation strength. Prefabricated branch cables are a complete set of products developed to match the power supply system of urban high-rise buildings. The factory converts the main and branch cables on special production equipment according to the requirements of cable users and parameters such as main and branch cable models, specifications, cross-sections, lengths and branch locations. , branch cables are connected together to ensure quality and greatly shorten the on-site construction period. Compared with branchless multi-core cables and plug-in bus ducts, prefabricated branch cables have the characteristics of good air-tightness and waterproof performance, safe and reliable power supply, convenient on-site installation and construction, low environmental requirements, and maintenance-free. Therefore, the application fields of prefabricated branch cables are rapidly expanding, and have now been extended to other fields such as highways, bridges, tunnel lighting, etc., and are developing in the directions of flame retardant, fire-resistant, halogen-free and low-smoke.
1. Advantages of prefabricated branch cables
(1) Excellent power supply reliability
The main cable conductor has no joints, which has good continuity and reduces fault points. Moreover, the branch joints are fully mechanized in the factory, which greatly reduces the quality defects caused by human factors.
(2) Excellent earthquake resistance, air tightness, waterproofness and fire resistance
The joints of prefabricated branch cables will not be affected when the wall is vibrated, especially when passing through settlement joints in buildings, no measures are required. Prefabricated branch cables are made of high-polymer materials in the factory because the branch joints and upper support heads are molded in the factory. Therefore, they are air-static and waterproof and are suitable for use in humid areas. It can provide normal power supply in humid environment and can also be laid in the open air and underground.
(3) Low installation environment requirements and convenient construction
The installation of prefabricated branch cables is extremely flexible and can be laid in the air or buried horizontally according to the user's needs.
It occupies a smaller building area and requires lower space dimensions for civil construction. Moreover, its allowable bending radius is small, which greatly reduces the difficulty of installation and reduces the size of the installation space.
(4) Maintenance-free
Prefabricated branch cables have a high one-time opening rate after being installed according to prescribed methods. Normally operating prefabricated branch cable systems do not require any maintenance.
However, prefabricated branch cables also have limitations. The allowed length of the main cable is very limited, which limits the scope of use. Prefabricated branch cables are only suitable for places where the electrical load of each branch is relatively stable and will not cause major changes in the electrical load due to changes in the use properties of each floor of the building. Once construction is completed, the capacity of each branch will not be increased. The bus duct can adjust the power load of each branch without exceeding the total load.
The emergence of prefabricated branch cables has changed the long history of making cable heads at the construction site and is a major breakthrough for cables used in low-voltage distribution systems.It has the characteristics of excellent power supply reliability, good earthquake resistance, air tightness, waterproofness, convenient construction, low environmental requirements, and maintenance-free.
The application of prefabricated branch cables has been rapidly promoted in China. With the acceleration of various infrastructure construction and real estate development in our country, the market requirements for the application types of prefabricated branch cables continue to increase, and the performance requirements continue to improve. For example, from the initial ordinary cables Developed to meet the requirements of flame retardant, fire-resistant, halogen-free and low-smoke flame retardant, from small cross-section to large cross-section, from the initial single core to multi-core, etc., the application prospects of prefabricated branch cables are very broad.
