1. What are the commonly used wires and cables?
Answer: according to the use situation, it can be divided into bare wire, insulated wire,
heat resistant wire, shielded wire, power cable, control cable, communication cable, RF cable, etc.
2. What is insulated wire?
A: there are usually the following insulated wires: PVC insulated wire, PVC insulated wire, PVC insulated
cable mixture, rubber insulated wire, buried agricultural plastic insulated aluminum wire, rubber insulated
cotton textile cord, PVC insulated nylon sheathed wire, PVC insulated power supply and lighting wire.
3. What kind of situation is the cable tray suitable for?
Answer: the cable bridge is applicable to the internal and external cable laying of general industrial and
mining enterprises, as well as the indoor and outdoor erection of telecommunications, radio, television
and other departments.
4. What are cable accessories?
Answer: common electrical accessories include cable junction box, cable intermediate junction box,
connecting pipe and terminal, steel plate connecting slot, cable bridge, etc.
5. What is the intermediate connection of the cable?
Answer: the device that connects the conductor, insulation shield, cable and cable protective layer to
connect the cable is called the intermediate connection of the cable.
6. What is the main electrical wiring?
Answer: the main electrical lines are connected to the main electrical equipment, bus plant and substation,
including connecting bus and auxiliary power system, according to certain functional requirements.
7. What regulations should be followed when selecting the cross section of power cable?
Answer: the selection of power cables should follow the following principles:
(1) The rated voltage of the cable shall 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 shall be equal to or greater than the maximum continuous
current of the power load;
(3) The section of conductor core shall meet the requirements of short-circuit stability of power supply system.
(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 shall enable the protection device to operate
reliably.
8. What are the advantages of cross-linked polyethylene cable and oil paper cable?
Answer: (1) easy to install, because it allows the minimum bending radius and light weight;
(2) Not subject to line drop *;
(3) Good thermal performance, high working temperature and large transmission capacity.
(4) Cable accessories are simple and dry.
(5) Simple operation and maintenance, no oil leakage;
(6) Low price;
(7) High reliability and low failure rate;
(8) The manufacturing process is less, the process is simple, and the economic benefit is remarkable.
9. What are the requirements for fixed single core cable fixing device? Why?
Answer: the clamp should have no iron to form a closed magnetic circuit, because when the cable core
passes current, a magnetic flux and current will be generated in the surrounding magnetic field to pass
through the cable core If ferromagnetic materials are used, the electromagnetic induction will be
generated on the basis of heating eddy currents in cast iron cables. Even burn the cable. Therefore,
Iron cannot be used as a fixing fixture for single core AC cables.
10. What are the biggest features and advantages of heat shrinkable cable head accessories?
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 size of the end of the joint
Easy installation, time-saving and labor-saving, improved performance and saved metal. The collection
of heat shrinkable cable accessories and dry bag integration combine the advantages of these two
accessories.
Answer: according to the use situation, it can be divided into bare wire, insulated wire,
heat resistant wire, shielded wire, power cable, control cable, communication cable, RF cable, etc.
2. What is insulated wire?
A: there are usually the following insulated wires: PVC insulated wire, PVC insulated wire, PVC insulated
cable mixture, rubber insulated wire, buried agricultural plastic insulated aluminum wire, rubber insulated
cotton textile cord, PVC insulated nylon sheathed wire, PVC insulated power supply and lighting wire.
3. What kind of situation is the cable tray suitable for?
Answer: the cable bridge is applicable to the internal and external cable laying of general industrial and
mining enterprises, as well as the indoor and outdoor erection of telecommunications, radio, television
and other departments.
4. What are cable accessories?
Answer: common electrical accessories include cable junction box, cable intermediate junction box,
connecting pipe and terminal, steel plate connecting slot, cable bridge, etc.
5. What is the intermediate connection of the cable?
Answer: the device that connects the conductor, insulation shield, cable and cable protective layer to
connect the cable is called the intermediate connection of the cable.
6. What is the main electrical wiring?
Answer: the main electrical lines are connected to the main electrical equipment, bus plant and substation,
including connecting bus and auxiliary power system, according to certain functional requirements.
7. What regulations should be followed when selecting the cross section of power cable?
Answer: the selection of power cables should follow the following principles:
(1) The rated voltage of the cable shall 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 shall be equal to or greater than the maximum continuous
current of the power load;
(3) The section of conductor core shall meet the requirements of short-circuit stability of power supply system.
(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 shall enable the protection device to operate
reliably.
8. What are the advantages of cross-linked polyethylene cable and oil paper cable?
Answer: (1) easy to install, because it allows the minimum bending radius and light weight;
(2) Not subject to line drop *;
(3) Good thermal performance, high working temperature and large transmission capacity.
(4) Cable accessories are simple and dry.
(5) Simple operation and maintenance, no oil leakage;
(6) Low price;
(7) High reliability and low failure rate;
(8) The manufacturing process is less, the process is simple, and the economic benefit is remarkable.
9. What are the requirements for fixed single core cable fixing device? Why?
Answer: the clamp should have no iron to form a closed magnetic circuit, because when the cable core
passes current, a magnetic flux and current will be generated in the surrounding magnetic field to pass
through the cable core If ferromagnetic materials are used, the electromagnetic induction will be
generated on the basis of heating eddy currents in cast iron cables. Even burn the cable. Therefore,
Iron cannot be used as a fixing fixture for single core AC cables.
10. What are the biggest features and advantages of heat shrinkable cable head accessories?
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 size of the end of the joint
Easy installation, time-saving and labor-saving, improved performance and saved metal. The collection
of heat shrinkable cable accessories and dry bag integration combine the advantages of these two
accessories.
