What are the functions of cable outer sheath and inner sheath?
Outer sheath: Protects the interior of the cable from mechanical damage and chemical corrosion, and enhances mechanical strength.
Inner sheath: The insulation layer will not be in contact with water, air or other objects. To prevent the insulation from moisture and mechanical damage.
What are the main properties of the insulation layer of electric cables?
1. High breakdown strength.
2. Low dielectric loss.
3. Fairly high insulation resistance.
4. Excellent discharge resistance.
5. With certain softness and mechanical strength.
What regulations should be followed when selecting the cross-section of electric cables?
1. The related voltage of the cable must be greater than or equal to the rated voltage of the power supply system at the installation point.
2. The sustained current of the cable should be equal to or greater than the maximum sustained current of the power supply load.
3. The core cross-section should meet the requirements of stability when the power supply system is short circuited.
4. Check whether the voltage drop meets the requirements according to the cable length.
5. The minimum short-circuit current at the end of the line should enable the protective device to operate reliably.
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