China Zhenglan Cable Technology Co., Ltd Company News

1. Contact: The backbone cable refers to the cable directly connected to the power supply; the branch cable refers to the cable that comes out of the distribution box and connects to the user or each workshop; the distribution cable refers to the cable that is electrically connected to the distribution box. Their function is to act as a bridge chain connecting the telecommunications room to each user client.   2. Difference: The number of backbone cables and distribution cables cannot be similar. The backbone cable should be one or two, the branch cable needs more than two, and the distribution cable should be more. Branch cables are divided into vertical branches and Horizontal branch. For vertical branches, they are mainly applicable to high-rise buildings. Generally, they are measured on site and divided according to the drawing, that is, the cross sectional area of cables is selected according to the load of each floor, the cable model is selected according to the fire resistance rating of the project, and the cable length is selected according to the distance between the low-voltage distribution cabinet and the highest floor of the branch; For Horizontal branch cable, the line selection basis is the same as that for vertical branch, but the length of Horizontal branch cable can be larger than the trunk line, but its sectional area should be smaller than the trunk line section. It should be noted that the vertical main line should be higher than the three section levels of the branch line.

The choice of cable sheath should be made in accordance with the requirements of relevant standards in combination with different situations. 1 The selection of cable sheath should meet the following requirements: 1.1 For single-core power cables in AC systems, when it is necessary to enhance the cable’s resistance to external forces, non-magnetic metal armor layers should be used, and steel armor without effective non-magnetic treatment should not be used. 1.2 For cables in humid, chemically corrosive environments or susceptible to water immersion, the metal layer, reinforcement layer, and armor should have polyethylene outer sheaths, and the thick steel wire armor of cables in water should have extruded outer sheaths.   2. The selection of the outer sheath of the cable during direct burial laying shall meet the following requirements: 2.1 When the cable is subjected to high pressure or has the risk of mechanical damage, it should have a reinforcement layer or steel tape armor. 2.2 In the soil where displacement may occur, such as quicksand layer and backfill land zone, the cable should be armored with steel wire. 2.3 For extruded cables used in areas seriously endangered by termites, outer sheaths with higher hardness should be selected, or thin outer sheaths with higher hardness can be extruded on ordinary outer sheaths. The material can be nylon or special polyolefin copolymerized Objects, etc., can also be armored with metal sleeves or steel tapes.   3. The selection of cable sheath for fixed laying in the air shall meet the following requirements: 3.1 When the small cross-section extruded plastic insulated cables are directly laid on the arm support, they should be armored with steel tape. 3.2 In places with high safety requirements and serious rodent infestation, such as underground passenger transportation and commercial facilities, plastic insulated cables should be armored with metal tape or steel tape. 3.3 When the cables are under high-drop force conditions, the multi-core cables shall be armored with steel wires, and the AC single-core cables shall comply with the provisions of Item 1   4 The selection of cable sheath for underwater laying shall meet the following requirements: 4.1 Steel tape armoring can be used for cables that do not require armored layers to bear tension in ditches, unnavigable creeks, etc. 4.2 For cables in rivers, lakes and seas, the type of steel wire armor selected should meet the stress conditions. When the laying conditions have protection requirements such as mechanical damage, the outer sheath that meets the protection and corrosion resistance enhancement requirements can be selected.

Characteristics of rubber sheathed cables: 1. incomparable softness of other wires and cables; 2. Good electrical insulation performance and chemical stability; 3. Good physical and mechanical properties and wear resistance; 4. Requirements for oil resistance, flame retardancy, cold resistance, and heat resistance. Choosing a cable that suits you has become a key issue. 1： Have a detailed understanding of the performance indicators of cables in various aspects, such as the wear resistance, compression resistance, and service life of rubber sheathed cables. Conduct a detailed inquiry and understanding, and then determine whether it meets your own usage conditions 2： The influence of the surrounding environment on the usage of cables. During the use of cables, in addition to being limited by their own usage conditions, there are also some external factors that play a decisive role. For example, if there is interference from magnetic fields, the cables need to be shielded; If it is a welding robot, due to the long working time and high temperature, it poses a great challenge to the outer sheath of the cable. Therefore, the selection should be based on the actual situation. 3： Clarify the use function of cables, whether it is control cables or rubber sheathed cables, no matter how excellent their performance is. What we need to do is to install the cables in positions suitable for their use. Only in this way can we achieve the original performance and service life of the cables.

Dear Customer, Thanks for visiting our website. Kindly note we will be on a 5-day May Day holiday from Saturday (April 29th, 2023) to Wednesday(May 3rd.2023). During holiday, work will become slow or even stopped temperately and we will have limit access to email. Kindly ask for your understanding. Once work resume, we will get back to you at first time. Regards Zhenglan Cable Technology Co., Ltd 2023.04.28

Among our commonly used power cables, rubber sheathed cables are also one of them. Rubber sheathed cable is a kind of soft and movable cable with multi-strand thin copper wire as conductor, rubber insulation and rubber sheath. Generally speaking, it includes general-purpose rubber-sheathed flexible cables, electric welding machine cables, submersible motor cables, radio device cables, and photographic light source cables. So what are the uses of rubber sheathed cables and what are the selection principles? Here is a brief introduction.   Application of Rubber-sheathed Cables Rubber-sheathed cables are widely used in various electrical equipment, such as household appliances, electric machinery, electrical equipment and portable power cords for appliances, and can be used indoors or outdoors. According to the external mechanical force of the cable, the product structure is divided into three types: light, medium and heavy, and there are appropriate connections in the section. Generally, light-duty rubber-sheathed cables are used in household appliances and small electric equipment, requiring softness, lightness, and good bending performance; medium-duty rubber-sheathed cables are widely used in agricultural electrification except for industrial use, and heavy-duty cables are used in such as port machinery, searchlights, Large-scale hydraulic irrigation and drainage stations for family business and other occasions. This type of product has good versatility, complete series of specifications, good and stable performance.  

MDPE has very high resistance to abrasion and it is extremely hard and has a low dielectric constant with superior oxidation resistance. The hardness of the MDPE cable sheathing protects the cable from sharp objects dropped or loaded onto the cable. This helps MDPE finds particular usage in transmission cables in the toughest of environments, notably those with the high ambient temperatures found in tropical and subtropical countries. But at these high ambient temperatures alternative sheathing materials such as PVC would be soft and prone to damage easily during laying of the cables.   Compared with LDPE (low density polyethylene), MDPE has significantly more strength enabling it to be pulled under heavy load for cabling applications; while compared to HDPE (high density polyethylene), HDPE has improved resistance to cracking.   Besides, various additives can be applied to MDPE compounds to improve fire retardant properties, UV and weathering resistance and the chemical degradation.