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Branch cable prefabricated branch cable is a new low-voltage power supply system widely used abroad in recent years, and can be used in the supply line have cable branch occasions. Such as high-rise buildings and ordinary residential buildings, large buildings and stadiums, standardized plant, mobile equipment and machinery, industrial furnaces, road, bridge, airport and so on. Compared with traditional cable branch connection and plug-in busbar, etc., with high reliability, easy installation, low environmental requirements, maintenance, etc., is a line with modern architecture and modern industrial facilities requirements of the cable products. Prefabricated branch cable according to user specifications and requirements of the cable length, and connector cable and trunk cable branch connector location on the trunk cable by cable manufacturers in the factory to the trunk cable (hereinafter referred to as the main cable) and a branch cable ( hereafter branch cable) and connectors must be insulated conductors bonded and post-related testing and test sent to the user. Installation of cable laying when users no longer need to carry out treatment and detection branch connector, it can directly connect the cable to the power line or connection with electric facilities. Because the branch connector is fully pre-made at the factory, so that the "prefabricated branch cable." Prefabricated branch cable connection has significant advantages reliable, waterproof, corrosion, acid mist, anti-vibration, bending radius, etc., can greatly reduce the labor intensity of line installation, shorten the construction period and reduce the project cost. Since the main cable conductor without joint, ensure the continuity, reduce points of failure, is currently the use of more plug-in busbar power distribution is a good alternative way, in most applications can be completely replaced by pluggable Busway. Normal operation of the line can not be separated and rational design, construction science, the safe operation of prefabricated branch cable distribution systems branch segment cable can not be separated more than two points. From the more than two thousand projects put into operation to see, not because of a short circuit branch cable section, overload failure affecting the operation to happen, proposed here do the following: 1. To prevent the branch segment cable load equipment failure, branch feeder cable distribution box must be set with overload and short circuit protection device is required when the carrying capacity greater than the rating of the branch segment cable protection element between regional distribution box in the branch protection element coupled to the body generally does not exceed 3m; 2, when the branch segment cable exceeds 3m, the design should be appropriate to increase the cross-sectional area of ??the branch cable so that the segment two-phase and three-phase short-circuit, the main cable protection master switch should be transient or short delay tripping. To prevent the coupling body to the power distribution box box joint regional cable segment fails, the branch segment cable construction should be careful not to scratch the sheathing and insulation, we recommend laying in the flame tube or tank, the branch segment cable entry separated by an insulating spacer or PVC tape wrapping seal, to ensure the terminal joints due to falling insulation aging dirt or dust caused by a short circuit. YFD-YJV type prefabricated branch cable has the following advantages: The company's products enterprise standard prefabricated branch cable features 1 Japanese JCS376A reference standard and IEC60502 standards setting, and digestion and absorption of foreign advanced technology and manufacturing processes, product performance and model specifications, which are more extended. The main cable and branch cable cores of the Company in accordance with corporate standards equivalent to IEC60502 production, technical performance to achieve a comprehensive and partly above IEC60502 requirements. Strict standards and rigorous performance testing to ensure product quality. Scheme 2 branch connector cable branch connector conductor using a specially designed connector crimping, high bonding strength, a large contact area, the contact resistance can ensure the reliability and requirements of the connection. In line with JICS2810 "indoor wiring wire connector General" test requirements, and through the GB9327 "joint test methods for compression and mechanical connectors for cable conductor" in the DC resistance test and short-circuit tests. 3 cable branch connector insulation using molded polymer insulation material, to prevent the intrusion of water and moisture, strength, good insulation properties. Waterproof, moisture, corrosion. 4 main cable terminal composite insulation and sealing structure, can ensure that the insulation of pressure and sealing requirements. Hanger used vertical laying adopt good insulation properties, high mechanical strength of the materials, safe and reliable enough to withstand the vertical laying of traction. 5 Performance of the products have to undergo rigorous testing and inspection, performance indicators in line with IEC, GB and corporate standards and other relevant standards, and adopted the authority of cables and electric equipment testing organizations - Wuhan High Voltage Research Institute product performance testing, product performance reached the advanced level of similar products, can meet the high quality power supply requirements, the user can be laid directly without the need for test use.