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The bending radius of the cable and its influence on the cable
1. What is the bending radius of the cable?
Cables must be actively or passively subjected to bending during the manufacturing, transportation, and installation and construction processes. When the cable is bent, the degree of bending is directly related to the bending radius of the cable.
1. The bending radius of the cable: Normally, we regard the bent cable as an arc, and the radius of the circle where the arc is located is the bending radius of the cable in th... more
Due to the frequent occurrence of electrical fires, people have put forward higher requirements for the safety of wires and cables. Flame-retardant cables refer to cables that can spread the flame within a certain range and have the function of self-extinguishing when an electrical fire occurs.
The combustion of the cable is caused by the external heating to produce flammable gas. To realize the flame retardant of the cable, the three elements that cause the combustion must be suppressed: flammable gas, heat and oxygen. The tradit... more
1. What is a special cable? What is the difference with ordinary cables?
Special cables are cables that have special uses and can be used on specific occasions. Special cables are a series of products with unique properties and special structures. Compared with ordinary wires and cables with a large quantity and a wide range, special cables have the characteristics of higher technical content, stricter use conditions, smaller batches, and higher added value. Special cables often adopt new structures, new materials, new design calc... more
The installation and construction of outdoor power cables is relatively difficult due to the complex terrain and numerous equipment and facilities in the urban area. In order to avoid problems such as cable abrasion, equipment damage, and personnel safety caused by construction, the following summarizes the 6 major techniques for laying outdoor power cables.
1. Before laying the cable, check whether the type and specification of the cable meet the design requirements: armored cables should be used for direct burial laying; unarmor... more
1. Short circuit: the phenomenon that the live wire and the live wire, and the live wire and the neutral wire are short-circuited on the electrical circuit. A short circuit can easily make the metal conductor instantaneously high temperature and cause the cable insulation material to catch fire.
2. Overload operation: Due to long-term overload operation, the operating temperature of the cable far exceeds the maximum allowable temperature during normal heating, which makes the insulation material of the cable aging and dry, so it is ... more
1.Standard value: The insulation thickness specified in the wire and cable product standard is based on the applicable voltage level of the product, the size of the conductor cross-section, the size of the current carrying capacity, the environmental conditions used, the electrical properties of the insulation material, the physical and mechanical properties, and the long-term consideration Many factors of the service life are determined through scientific calculations and long-term practical experience.
The significance of the me... more
In the production and manufacturing process of cables, the two concepts of isolation sleeve and inner lining are often encountered. The so-called isolating sheath is the sheath between the coating layers of two different metal materials, which is commonly referred to as the inner sheath. The inner lining is the core and filler (if any) of the multi-core cable. The non-metallic cladding layer on the outside and under the protective layer.
Isolation sleeve: The focus is on the word isolation. The isolation is between two different met... more
