A pre branch cable can be separated into up to a few branches

Pre-branch cables, mostly used in high-rise buildings.

Distribution trunk line (trunk type power distribution mode).

The trunk cable conductor has no joints (the joints have been made and closed in the branch point during processing in the production plant), and the power distribution of the pre-branch cable is similar to that of the busway.

Power distribution mode, but the cable has good seismic resistance, air tightness, waterproof performance, occupies a small space, easy to install, the disadvantage is that the quality fault is difficult to repair on site, the cable is processed for specific engineering conditions, and does not have interchangeability.

For example, if the number of power distribution floors in a building is 24, each floor is divided into 1 branch, the trunk line is divided into 3 channels (each road is 8 floors for power distribution, the current is 315A), and each floor is divided into 1 cable, and the current is calculated as 40A, then the branch cable configuration is:

1. Select 3 x 8 branch cables;

2. Trunk cable specifications.

YJV-4*185+1*95, branch cable specification YJV-5*16, split length 2m;

3. The height of the standard floor is 3m, and the length from the distribution room to the first floor of the distribution is 80m;

4. (3 feeder cables*80m), 3 finished pre-branch cables*25m, branch spacing 3m, and 3 cable transition boxes.

Theoretically, the main line is thick enough to be divided indefinitely.

Trunk cables generally do not have more than 6 branches, and the technical measures are described.

The pre-branch cable is the cable of the prefabricated branch line according to the user's design drawings when the factory produces the backbone cable. This is a new technological product in recent years.

The factory manufactures the branch line of the cable on the trunk cable in advance, and the cross-sectional size of the branch line and the length of the branch line are determined according to the design requirements, which greatly shortens the construction period, greatly reduces the material cost and construction cost, and ensures the reliability of power distribution to a greater extent.

The pre-branch cable is composed of four parts: 1. a backbone cable; 2. a branch line; 3 Branch Joints: 4 Related Accessories, and Available in Three Types:

Ordinary type, flame retardant type (ZR), fire resistant type (NH). Pre-branch cable is a substitute for bus duct power supply in high-rise buildings, which has the advantages of reliable power supply, easy installation, good waterproofness, small construction area, low failure rate, cheap and maintenance-free, and is suitable for AC rated voltage in distribution lines. It is widely used in vertical power supply in the electrical shafts of high- and medium-rise buildings, residential buildings, commercial buildings, hotels and hospitals, and is also suitable for power supply systems such as tunnels, airports, bridges and highways.

The pre-branch cable is a complete set of products developed to cooperate with the power supply system of urban high-rise buildings. It is composed of three parts: the cable body, the branch connection box and the lifting device. In general, the cross-section of the trunk cable is 25-500mm2, and the cross-section of the branch cable is 6-120mm2

Prefabricated branch cables are customized cables according to the site conditions and manufacturers!

Answer: First, the connotation of branch cables.

A branch cable is a cable that connects the distribution network of electrical equipment.

Second, branch cable application discipline.

Ship Engineering (first-level discipline), Ship Technology (second-level discipline).