How To Choose High Temperature Braided Cable?

The long-term allowable current-carrying capacity of the high-temperature braided wire cable refers to the thermal stability of the current value when the temperature of the conductor of the high-temperature cable passes through the current and reaches this temperature and just reaches the long-term allowable working temperature. The current carrying capacity depends on the product's allowable higher operating temperature, the working system with power supply (such as long-term continuous load, variable load, intermittent load operation, etc.), wire and cable laying method and environmental conditions. Generally speaking, the ampacity refers to the allowable working current during long-term continuous load operation, and the corresponding conversion is carried out under other conditions.

Wires and cables for power and lighting circuits need to be used in some special occasions, such as high-voltage ignition wires for vehicles and compensation wires for instrumentation systems, and have no current-carrying requirements.

Cable manufacturers only provide correct cable cross-section data, not the cable's current rating. Since the rated current of the cable is related to the environment, the duty cycle of the load, the allowable operating temperature of the cable insulation, and the allowable voltage drop of the cable, the electrical designer of the purchaser should comprehensively consider the selection of the appropriate cable section.

There are misunderstandings about the economical cross-section of cables. Some designers and owners believe that if the temperature rise does not exceed the norm, a small part of the cable is the economic part. This is wrong because he ignores the economic loss caused by the energy consumption of the cable itself. Under the same load, the larger the cross-sectional area of the cable, the smaller the current density of the cable and the smaller the energy consumption of the cable.

The temperature rise of high temperature braided cable is related to the current density. The higher the current density, the higher the temperature rise. The life of the insulating material is related to the working temperature of the insulating material. The higher the operating temperature of the insulating material, the shorter its life.

The economic cross-section of a cable is a comprehensive parameter that involves the initial investment cost of the cable, the cost of energy consumption over the life of the cable, and the service life of the cable. The generally accepted view in China is that the economical cross-section of the cable is twice the cross-section, considering only the temperature rise.