Why is the high temperature cable "high"?
Why is the high temperature cable "high"?
High temperature wire is a high temperature resistant wire made of special materials. It is suitable for outgoing connecting wires of various household appliances, lighting lamps, electronic equipment, temperature sensors, etc. In addition to the high-temperature characteristics, what aspects are high-temperature wires higher than ordinary wires?
Materials. The main material of high-temperature wire is high-temperature resistant material, which can be used for a long time in high-temperature environment. High temperature wires are generally divided into fluoron insulated high temperature wires, silicon insulated high temperature wires, silicon insulated braided wires, multi-core high temperature wires, etc.
Insulation performance. Different from ordinary cables, high temperature resistant wires have strong insulation performance. In this way, in some factories or laboratories with high requirements, the high-temperature wire can avoid the influence of short circuit or circuit and achieve better use effect.
Aging resistance. One of the great advantages of high-temperature wire is its aging resistance and durability. This high temperature wire can be used for a long time. Compared with ordinary cables, it can help us reduce many later maintenance costs.
Flame retardant. High temperature wire material has good flame retardancy. In case of short circuit or high temperature fire, it will not suddenly affect other circuits in series and increase risk, but it is effective flame retardant and has higher safety performance.
How high temperature can the wire withstand
Before talking about high-temperature wires, let's learn about a - What is the working temperature of ordinary wires and cables. Generally, the common insulation materials of ordinary cables include polyethylene, polypropylene, polyvinyl chloride, ethylene, etc. the cables made of such materials can generally operate at 70 C ~ 90 C for a long time.
PFA Teflon is used as the insulating layer of high-temperature resistant wires. It is precisely because this material has good high-temperature resistance that the wires produced can operate for a long time at 180C and above. If we want to talk about the maximum resistance of high-temperature wires, we have to calculate 200 C. However, under the high temperature of 200C, even high-temperature wires can not run for a long time, but only for a short time, otherwise they are prone to failure.
Two key factors to ensure the applicability of high temperature cable
Cables can be installed in harsh and high temperature environments, but choosing the right cable under the right environmental conditions is very important to ensure that the expected life of the cable is not affected. The use of wire and cable products beyond the design temperature range may lead to premature and expensive maintenance failures. Now, let's look at the high temperature wire.
What is a high temperature wire?
High temperature wire is usually defined as a wire with a rated temperature of 125C or higher, although high temperature can also refer to a rated temperature as low as 90C. High temperature cables can be single core or multi-core. These products usually consist of conductors (usually annealed, tin copper, copper or nickel copper) and insulating materials. The high-temperature wire can also have an additional sheath composed of glass fiber braid or K-fiber material.
The two key factors to ensure the applicability of high-temperature wires are the temperature rating and current carrying capacity of wires. The temperature rating can be defined as the larger continuous temperature that the wire can withstand during its service life. If the rated temperature of the cable is not suitable for the environment and ambient temperature, the expected life of the cable may be affected.
The current carrying capacity of the insulated conductor is not higher than the safe current carrying capacity of the insulated conductor. If the cable size is too small, the heat generated by the circuit load may exceed the rated temperature value of the cable, and the cable may be damaged.