The cross-sectional area of a cable refers to the cross-sectional area of the cable, usually expressed in square millimeters (mm ²), mainly used to indicate the size of the channel through which current flows through the cable. The larger the cross-sectional area of the cable, the smaller the resistance formed, and the stronger the ability for current to pass through. Choosing the appropriate cross-sectional area of the cable is essential to ensure safe and reliable transmission of electrical energy during operation. So how should the specific cross-sectional area of the cable be selected? The cable editor has summarized several principles.
The rated voltage of the cable should be greater than or equal to the rated voltage of the power supply system at the installation point.
02. The continuous allowable current of the cable should be equal to or greater than the continuous allowable current of the power supply load.
03. The cross-sectional area of the wire core should meet the safety requirements for short circuits in the power supply system.
As the length of the wire increases, resistance will cause a decrease in voltage. When selecting cable cross-sections, attention should be paid to whether the voltage drop meets the requirements to ensure the normal operation of the power supply system.
05. Select cables that can meet the environmental conditions of the installation area, such as temperature, humidity, corrosiveness, and fire resistance.
In addition to the above regulations, when selecting the cross-section of power cables, factors such as changes in power load, cable heat dissipation conditions, cable installation methods, and service life should also be considered. Only by making reasonable choices according to regulations can the normal operation and safe use of power cables be ensured.
Several Principles Should Be Followed When Selecting Cable Cross-sections
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