Buy Wire and Cable These Knowledge Points You Want to Know!

                                                      First tip: first understand the meaning of Aerial Bundled Cable (ABC) BS 7870 Standard

Use code: A installation line, B cloth wire, C Marine cable, R flexible cable, K control cable, N agricultural cable, M coal cable, U mine cable, JK overhead cable;ZC flame-retardant cable, NH fire-resistant cable, WD low smoke free halogen cable.

Characteristic code: B flat, R soft, C heavy duty, Q light duty, Z medium duty, S twin type, P shield, L aluminum core, V insulated polyvinyl chloride, YJ crosslinked J polyethylene, H welding machine.For example, WDZN-BYJ stands for polyethylene insulated low smoke no halogen flame retardant wire, its rated voltage is 450/750V.

 

                                                             Second recruit: choose PVC Sheathed Power Cable according to the purpose

When choosing wires and cables, use, laying conditions and safety should be considered.Such as:

According to the different electrical appliances, optional wire, power cord, twisted pair, red and black wire, video cable and so on.

According to the different uses, can choose power cable, fire cable, overhead insulated cable, control cable, etc.

According to different laying conditions, cross-linked cable, armoured cable, aluminum alloy cable, anti-corrosion cable and so on can be selected.

According to the safety requirements, can choose flame retardant cable, halogen-free flame retardant cable, fire resistant cable, etc.

 

 

                                                                            Third recruit: choose cross-sectional area namely specification

The specifications of home wiring have dozens of specifications such as BV2.5, BV1.5, BV4, BV6;BV is a national standard code, and the numbers are our traditional square number of wires. In general, the wires are used as:

1,The 6 square meters are suitable for households, because the demand for land used by households is high.

2, 4 square suitable for the kitchen switch socket separate line and air conditioning water heater line, after all, these are power consumption, the wire specification can carry more electrical appliances as far as possible;

3, 2.5 square wire used in the common switch, socket and lighting main line;

4, 1.5 square for lighting control circuit switch, etc.

The specification of wire and cable is not the bigger the better, choose the right one is good, the specification is too large will only waste electricity

                                                                              Fourth recruit: choose brand heavy service

The safety and reliability of wire and cable should be guaranteed as the common wire in life.Therefore, when purchasing wires and cables, we should start from our own actual situation and buy reliable old brands. We should consider more from the practical aspect, so that quality, price and after-sales service can be guaranteed.

Jin Hautai, Dongguan wire and cable dealer, I hope this article can help you.

cable common sense question

1. What are the requirements for fire blocking of cable holes?

Answer: For larger cable penetration holes, such as the cable penetration floor, when using fireproof blocking materials to block, according to the actual situation, first apply four to six layers of fireproof paint on the cable surface, the length is about 1.5m below the hole, and then Refractory materials are processed into a board-supporting fire-proof blocking material with a certain strength to ensure that the blocking is firm and easy to disassemble when the aerial bundled cable 7870 standard  is replaced. The blocking is dense and non-porous to effectively block the smoke and the fire.

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2. What checks should be paid attention to before the torch is ignited?

Answer: The following inspections should be carried out:

(1) Whether the pump is leaking or leaking, whether the oil barrel and nozzle are leaking or leaking;

(2) Whether the amount of oil in the oil drum exceeds ¾ of the capacity of the oil drum, and whether the screw plug for refueling is tightened.

3. What should be paid attention to when using blowtorch?

Answer: (1) The maximum fuel injection volume of the blowtorch is ¾ of the volume of the fuel tank;

(2) The pressure should not be too high at the beginning, the flame can be used after being ignited from yellow to blue;

(3) There should be no combustibles around, and the air should circulate;

(4) Turn off the adjustment switch when it is out of service. After the fire is extinguished, slowly loosen the oil hole cover to release air. After the air is exhausted, loosen the adjustment switch, and then loosen the hole cover after it is completely cooled;

(5) Kerosene blowtorch and gasoline blowtorch should be used separately.

4. What is the purpose of manual hydraulic pliers? How to do it?

Answer: The connection of two wires is usually by inserting the two wire ends into a crimping tube made of the same material, squeezing several pits with crimping pliers to connect the wires together. When crimping, when the handle is lifted up, The plunger moves outwards, a vacuum is generated in the lower cavity of the oil inlet valve, and the oil in the oil tank enters the plunger cavity. When the handle is pressed down, the plunger moves inward. After the oil is pressurized, the oil inlet valve is closed and the oil outlet valve is opened, so that the oil pressure enters the hydraulic cylinder, pushing the piston and the male mold, and there is a crimping pipe between the male and female molds. When the depth of the crimped pit reaches a certain value, the oil return valve is opened and the piston automatically returns. After pressing one pit, move the pressing tongs and press the next one.

5. According to the difference of insulation and protective layer, what are the main types of commonly used low-voltage power cables?

Answer: (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 cables;

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

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

(6) Rubber insulated power cables.

Main Characteristics of Extruded Insulated Power Cable

Power cables are cables used to transmit or distribute high-power electrical energy in power systems. With the great development of the petrochemical industry worldwide, medium and low voltage extruded insulated power cables have become an important variety of wires and cables due to their simple structure, convenient manufacturing and processing, and convenient construction and maintenance.

Extruded insulated power cable is also called rubber-plastic cable. It is a power cable with high polymer as the insulation. It is made of copper or aluminum wire twisted into a conductor, and then extruded for insulation, (metal tape), (inner lining/isolation sleeve) ), (armor layer), sheath layer (if there is a cable forming process, add the necessary filling materials). such as PVC XLPE insulated power cable 25-400mm2 Commonly used plastics are polyvinyl chloride, polyethylene, and cross-linked polyethylene.

Finished product production standards
The performance and quality of cable products are directly related to the safety of people’s lives and properties. Therefore, products must be produced in strict accordance with the requirements set by national standards, and various performance tests are also required before leaving the factory. There is a huge market demand for medium and low voltage extruded insulated power cables, and they have a wide range of applications. Once a potential safety hazard occurs, it is very easy to cause fires and other accidents. Therefore, it is necessary to check from the source to ensure product quality.
In 2020, in the latest national standard GB/T 12706.1~3-2020, the main production performance requirements for medium and low voltage extruded insulated cables are as follows:
1. The maximum temperature of the conductor during normal operation: PVC insulation 70°C; XLPE insulation 90°C;
2. When short-circuited (the longest duration does not exceed 5s), the maximum temperature of the conductor of the XLPE insulated cable does not exceed 250℃, and the maximum temperature of the conductor of the PVC insulated cable does not exceed 160℃;
3. The bending radius during cable laying should not be less than the following requirements: single-core unarmored cable 20D; single-core armored cable 15D; three-core unarmored cable 15D; three-core armored cable 12D (Note: D refers to Cable outer diameter)

Product performance advantage
Compared with GB/T 12706.1~3-2008, the latest national standards put forward new requirements on raw materials, processes and testing procedures. Such as cable armoring materials, especially when choosing armoring materials, especially when armoring is used as a shielding layer, the possibility of corrosion should be considered. This is not only for mechanical safety, but also for electrical safety; in terms of technology, The production process of the wrapping lining layer requires the use of single or multiple strips overlapped and wrapped. When multiple strips are wrapped, each one should overlap.

Since the release of the latest national standards for medium and low voltage extruded insulated cables, Far East has actively responded to national requirements, strictly controlling the purchase of raw materials, adjusting the process flow, and increasing the testing items to ensure the quality of the products.


The extruded insulated power cables below 35kV produced by Henan Huaxing are mainly suitable for transmission and distribution lines with AC rated voltages below 35kV. Among them, the main characteristics of flame-retardant cables are that they are not easy to catch fire or the flame spreads slowly after fire and can be controlled within a certain range. They are suitable for power stations, subways, tunnels, high-rise buildings, and large-scale industrial and mining industries with high cable laying density. , Oil fields, coal mines and other places.
Halogen-free low-smoke flame-retardant cables are characterized by their flame-retardant properties, low smoke and harmlessness (less toxicity and corrosion); flame-resistant cables are characterized by their ability to transmit power under normal working conditions , It can also maintain a certain period of safe operation under burning conditions. It is used in occasions where the cable has a higher fire resistance requirement.
For a long time, we have continued to explore the way of quality management and quality management, continue to improve the level of lean management, and set a benchmark for the transformation and upgrading of the cable industry in the new era. In the future, Henan Huaxing Wires & Cable Company will continue to improve its quality management model, from customer needs to customer satisfaction, take quality as its life, innovate and make breakthroughs, and achieve the ultimate in products and services!