Introduction to pre branched cables

Pre branching cables are pre made branching cables that can be used directly after leaving the factory without the need for on-site branching; High one-time power on rate to avoid various hidden dangers on site. The branch line factory is pre manufactured on the main cable, and the cross-sectional size and length of the branch line are determined according to design requirements, greatly shortening the construction period, reducing material and construction costs, and ensuring the reliability of power distribution.

Pre branched cables are cables that are prefabricated with branch lines according to user design drawings during the production of main cables by factories. They are a new technology product in recent years and have excellent seismic resistance, airtightness, and waterproofing compared to the original technology. The pre branch cable is a special cable, which is similar to the Bus duct distribution cable. The cable conductor has no joint, good continuity, simple installation, and short construction period. It is mostly used for the distribution trunk line (trunk distribution mode) of high-rise buildings. The disadvantage is that quality faults are difficult to repair on site, and the cable is processed according to specific engineering conditions and does not have interchangeability.

classification

(1) Backbone cables; (2) Branch line; (3) Branch joint; (4) Related attachments, available in three types: regular, flame retardant (ZR), and fire-resistant (NH). Pre branch cable is a substitute for Bus duct power supply in high-rise buildings. It has the advantages of reliable power supply, convenient installation, good waterproof, small area of ancient buildings, low failure rate, low price, maintenance free, etc. It is suitable for distribution lines with AC rated voltage of 0.6/1KV. Widely used for vertical power supply in electrical shafts of high-rise buildings, residential buildings, commercial buildings, hotels, and hospitals, as well as in power supply systems such as tunnels, airports, bridges, and highways.

main performance

(1) Insulation resistance ≥ 200MQ;

(2) Insulation and withstand voltage ≥ 3.5kV/5min;

(3) Good airtightness and waterproofing, that is, immerse the branch joint in water, measure the insulation resistance and power frequency withstand voltage between the water and the cable core, and both should meet the requirements of 1 and 2;

(4) The small contact resistance of branch joints, the ratio of contact resistance to the reference resistance of equally long branch lines ≤ 1.2;

(5) The short circuit strength of the joint is high, and the change rate of contact resistance ratio after short circuit is ≤ 0.2;

(6) ZR-YJV type flame retardant prefabricated branch cable, with a self extinguishing time of ≤ 12s for the sheath, meeting the requirements of GB12666.5; Gas design circle;

(7) NH fire-resistant cable can not only supply power under normal working conditions, but also maintain normal operation for 90 minutes under combustion conditions, meeting the requirements of GB12666.6;

(8) The maximum working temperature of the copper core of VV type cables is 70C, and the maximum working temperature of the copper core of YJV type cables is 90C;

(9) It has excellent corrosion resistance and can resist the corrosion of inorganic salt oil, alkali, acid, and organic deep agents;

(10) YJV prefabricated branch cable has excellent thermal stability and aging resistance;

(11) GWDZ, WDZA, WDNA, VDZAN - clean prefabricated branch cables have superior performance such as low smoke, low toxicity, halogen-free, and fire resistance.

(12) GZR-YJV chlorine isolation.