Many people tend to confuse high-temperature cables with fire-resistant cables, but the two are actually quite different. Summarized in one sentence, that is: fire-resistant cables, emphasizing “explosiveness”, all efforts are only for Runs normally even if it catches fire. High temperature resistant cables, emphasizing “sustainability”, all preparations are only for continuous and normal operation in high temperature environment. As one of the typical representatives of special cables:
The “high temperature” resistance of the general high temperature cable is not as good as that of the fire-resistant cable, but it has good flame retardancy, waterproof, corrosion resistance and other properties. If the fire-resistant cable is a “partial talent” with a particularly prominent homework. That high temperature cable is an excellent “all-rounder” in every homework.
- High temperature resistance
High temperature cables usually refer to cables that can normally transmit signals or power at temperatures of 180°C and above.
The high temperature resistant cable itself has good high temperature resistance performance. Due to the use of a new type of shell material, its super heat insulation and high temperature resistance can ensure that the cable works normally in a high temperature environment.
However, it should be emphasized that this temperature often refers to the temperature of the inner conductor, and under normal circumstances, when the temperature of the inner conductor of the cable reaches a high tolerance range, the outer temperature will be relatively low by about 30 degrees. . Never take the extreme value of the conductor temperature inside the cable as the extreme value of the ambient temperature it can withstand.
It must be explained: in terms of the extreme value of high temperature tolerance, general high temperature resistant cables are not as good as fire resistant cables.
The long-term continuous working temperature of high temperature cables is generally 125 degrees, 135 degrees, 150 degrees, 180 degrees, 200 degrees, 250 degrees (cables of 90-155 degrees and below generally refer to heat-resistant cables).
Fire-resistant cables, the minimum requirement is also to be able to withstand burning for at least 90 minutes under the flame of 750 ° C ~ 800 ° C and the rated voltage without the cable being broken down (that is, the 3A fuse is not blown).
- Flame retardancy
The insulating material used in the high temperature cable is able to withstand high temperature, and its flame retardancy is particularly good.
For example, fluoroplastic insulated wires and cables can even be used in atomic reactors; silicone rubber insulated wires and cables have a working temperature range of -60°C to 180°C, which means that they can also withstand low temperatures.
And the “leader brother” in the high temperature cable – inorganic material ultra-high temperature cable, the normal working temperature is 250 ℃, depending on the selected material, it can also be made into a cable with a working temperature of 500 ℃, 800 ℃, or even 1000 ℃.
In addition, high temperature resistant cables often have armor, such as steel tape armor, steel wire armor, and the insulating materials used can withstand high temperature, and their flame retardancy is naturally relatively strong.
- Comprehensiveness
The high temperature cable also has excellent waterproof, oil resistance, strong acid resistance, strong alkali resistance, strong oxidant resistance and corrosion resistance
It should be known that industries related to heat and high temperature, such as petrochemical, steel, aerospace, shipbuilding, military industry, pharmaceuticals, food, plastic machinery, boilers, etc., are all application places for high temperature cables.
These environments are often high temperature, high humidity and corrosive, and high temperature resistant cables that need to work continuously in this environment must naturally have excellent performance to deal with these environments.
