Selecting the right insulated and sheathed cable requires consideration of multiple factors.
1. Use environment
Temperature conditions: If the cable is to be used in a high temperature environment, such as in a metallurgical plant or near a heating device, it is necessary to choose an insulating sheath material that can withstand high temperatures, such as silicone rubber insulated sheathed cable, which can work normally at higher temperatures. Its operating temperature range is generally up to -60℃ to 180℃, which can effectively prevent the insulation layer from aging and damage due to excessive temperature.
In low temperature environments, such as outdoor facilities in the north, cables with good cold resistance should be selected. Some special polyvinyl chloride sheathed cables can still maintain good flexibility at around -40℃ after cold resistance treatment to avoid sheath rupture.
Humid and corrosive environments: For humid environments, such as basements, underwater or coastal areas, insulating sheaths with good waterproof and moisture-proof properties should be selected.
If the cable will be exposed to chemicals, such as in chemical companies, it is necessary to choose a sheath material that is resistant to chemical corrosion.
2. Electrical performance requirements
Voltage level: First of all, the cable should be selected according to the voltage in the actual application. For low voltage applications, such as household electricity, cables with a rated voltage of 450/750V are generally sufficient. In high voltage equipment in industrial enterprises, cables with a rated voltage of 6kV - 35kV may be required to ensure safe and reliable power transmission.
Current carrying capacity: Choose the appropriate cable cross-sectional area according to the load current. This can be determined by calculating the load current and then referring to the cable current carrying capacity table.
3. Mechanical properties and installation requirements
Mechanical strength: If the cable needs to withstand large tension or pressure, such as in an elevator shaft, it is necessary to choose a cable with high mechanical strength. Both the sheath and the insulation layer should be strong enough to prevent the cable from being pulled off or crushed.
Installation method and flexibility: For cables that need to be bent frequently or installed in narrow spaces, cables with good flexibility should be selected.
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