Dongguan Zonsky wire and cable equipment manufacturers tell the knowledge of wire and cable

Among the more than 7,000 cable companies in China's wire and cable industry, small and medium-sized enterprises account for 97%. In the reality of increasingly fierce competition, how to effectively improve the quality of wire and cable products has become a very important issue. Where is the root cause of the quality problems of wire and cable products? The following Dongguan Zonsky wire and cable equipment manufacturers will conduct in-depth analysis from enterprises, markets and administrative supervision.

1. What kinds of insulated wires are there?

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

2. What are the types of commonly used wires and cables according to their uses?

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

3. What aspects should be considered when choosing the cross section of a power cable?

A: The following aspects should be considered:

(1) The long-term allowable working current of the cable;

(2) Thermal stability in the event of a short circuit;

(3) The voltage drop on the line cannot exceed the allowable working range.

4. What are the cable accessories?

Answer: Common electrical accessories include cable terminal junction box, cable intermediate junction box, connecting pipe and terminal block, steel plate wiring slot, cable tray, etc.

5. Zonsky Wire and cable testing instrument manufacturers tell you what is the cable intermediate joint?

Answer: The device that connects the cable with the conductor, insulating shielding layer and protective layer of the cable to connect the cable line is called the cable intermediate joint.

6. What regulations should be followed when choosing the cross-section of power cables?

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

(1) 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;

(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 wire core should meet the requirements of the stability of the power supply system when it is short-circuited;

(4) Check whether the voltage drop meets the requirements according to the length of the cable;

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

7. What are the advantages of XLPE cable compared with oil-paper cable?

Answer: (1) Easy to install, because it allows a small minimum bending radius and light weight;

(2) Not subject to line drop*;

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

(4) The cable accessories are simple, all of which are dry structure;

(5) Simple operation and maintenance, no oil leakage;

(6) The price is lower;

(7) High reliability and low failure rate;

(8) The manufacturing process is few, the process is simple, and the economic benefit is remarkable.

8. What are the requirements for the clamp for fixing the AC single-core cable? Why?

Answer: The fixture should have no iron parts to form a closed magnetic circuit. This is because when the cable core passes current, a magnetic field line is generated around it. The magnetic field line is proportional to the current passing through the wire core. If magnetic conductive materials such as iron parts are used, according to the It can be known from electromagnetic induction that eddy currents will be generated in the iron parts to make the cable heat up and even burn out the cable. Therefore, it is not possible to use iron parts as a fixing fixture for single-core AC cables.

9. What are the biggest features and advantages of the accessories of the heat shrinkable cable head?

A: The biggest feature of heat shrinkable accessories is that the stress tube is used instead of the traditional stress cone. It not only simplifies the construction process, but also reduces the size of the terminal of the joint. It is easy to install, saves time and labor, has superior performance and saves metal. The heat shrinkable cable accessory integrates the pouring type and the dry wrapping type, combining the advantages of these two types of accessories.

The editor of Zonsky reminds the majority of cable manufacturers that the most important aspects when selecting testing instruments are two aspects: one is product quality, and the other is after-sales service. Zonsky Instrument specializes in the production of wire and cable testing instruments, fire and flame retardant testing instruments, and provides related technical advice and technical services. Welcome new and old customers!