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How Much Do You Know About Cables And Their Accessories?

Pulished on Jan. 02, 2020

1. What are the common types of wires and power line fittings?

Answer: It can be divided into bare wires, insulated wires, heat-resistant wires, shielded wires, power cables, control cables, communication cables, radio frequency cables, etc. according to the purpose.

2. What are the types of insulated wires?

Answer: There are the following types of insulated wires: PVC insulated wires, PVC insulated flexible wires, nitrile butadiene polyvinyl chloride mixed insulated wires, rubber insulated wires, agricultural underground buried aluminum core plastic insulated wires, rubber insulated cotton Textile cords, PVC insulated nylon sheathed wires, PVC insulated cords for power and lighting, etc.

3. Where is the cable bridge suitable?

A: The cable bridge is suitable for the indoor and outdoor overhead laying of power cables and control cables in industrial and mining enterprises. It can also be used for telecommunications, broadcasting and other parts to be installed indoors and outdoors.

4. What are the cable accessories?

Answer: Commonly used cable accessories include cable terminal junction boxes, cable intermediate junction boxes, connecting pipes and terminals, steel plate junctions, preformed lines, and so on.

How Much Do You Know About Cables And Their Accessories?cid=6

Cable Clamp

5. What is the cable intermediate connector?

Answer: The equipment that connects the cable with the cable's conductor, insulation shield, and maintenance layer to connect the cable line is called the cable intermediate connector.

6. What is the main electrical wiring?

Answer: The main electrical wiring is the connection method of the primary electrical equipment and busbars in power plants and substations, including the connection method of the main busbars and plant power systems according to certain functions.

7. What rules should be followed when selecting the cross section of a power cable?

Answer: The selection of power cables should follow the following guidelines:

(1) The rated 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 continuous allowable current of the cable should be equal to or greater than the maximum continuous current of the power supply load;

(3) The cross section of the core should meet the stability needs of the power supply system in the event of a short circuit;

(4) Check whether the voltage drop is suitable according to the cable length;

(5) The minimum short-circuit current at the end of the line should enable the maintenance equipment to operate reliably.

8. What are the benefits of cross-linked polyethylene cables and oil-paper cables?

Answer: (1) Easy equipment, because it allows the minimum bending radius to be small and light weight;

(2) Not bound by the line drop;

(3) Good thermal performance, high allowable working temperature and large transmission capacity;

(4) Cable accessories are brief, all are dry structure;

(5) Simple operation and maintenance without oil leakage;

(6) Low quotation;

(7) High reliability and low failure rate;

(8) The production process is few, the process is simple, and the economic benefits are significant.

9. What are the cable clamps for fixing AC single-core cables? Why?

Answer: The clamp should have no iron parts to form a closed magnetic circuit. This is because when the cable core passes a current, magnetic lines of force occur around the cable core. The magnetic field lines are proportional to the current passing through the core. It can be known by electromagnetic induction that eddy currents will occur in the iron parts and cause the cables to heat up, and even burn the cables. Therefore, iron parts cannot be used as fixing fixtures for single-core AC cables.

10. What are the biggest features and benefits of the following accessories for heat shrinkable cable heads?

Answer: The biggest feature of heat shrinkable accessories is to replace the traditional stress cone with a stress tube. It not only simplifies the construction process, but also reduces the standard of the terminal of the joint. Heat-shrinkable cable accessories integrate the perfusion type and the dry-pack type into one, merging the benefits of these two types of accessories!