Follow Us:
Faq
FAQ
Q
What tests and inspections should be carried out on power cables before laying?
A
Before laying, check whether the type, specification and length of the cable meet the requirements and whether there is external force damage. Low-voltage cables use a 1000V megohmmeter to remotely measure the insulation resistance, and the resistance is generally not less than 10MΩ. High-voltage cables use a 2500V megger to measure the resistance. Generally not less than 400MΩ.
Q
What are the factors that determine the long-term allowable current carrying capacity of the cable?
A
(1) The long-term allowable working temperature of the cable;

(2) The heat dissipation performance of the cable itself;

(3) The condition of the cable installation and the heat dissipation conditions of the surrounding environment.
Q
According to the difference of insulation and protective layer, what are the main types of commonly used low-voltage power cables?
A
(1)Oil-impregnated paper insulated lead-clad (or aluminum-clad) power cable;

(2)Non-drip oil-impregnated paper insulated power cable

(3)PVC insulated and sheathed power cable;

(4)Cross-linked PVC insulated and PE sheathed power cable;

(5)Cross-linked PVC insulated and sheathed power cable;

(6) Rubber insulated power cables.
Q
What’s the application of stranded or solid conductor Cu/PVC cable?
A
For copper core, suitable for the fixed laying of power devices of 450/750V and below, widely used in electromechanical engineering. For aluminum core, due to its light weight, is usually used for overhead lines, especially long-distance transmission lines.
Q
What is the function of the cable inner sheath?
A
Keep the insulating layer in contact with water, air or other objects to prevent moisture and the insulating layer from mechanical and physical damage.
Q
What is the function of the cable outer sheath?
A
Protect the inner sheath from mechanical damage and chemical corrosion, and enhance mechanical strength.
 1 2 3 4 5 6 7 8 9 10