What are the reasons for the fire of low voltage cable?
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2022-12-22

What are the reasons for the fire of low voltage cable?

What are the causes of low-voltage cable fire? The main causes of low-voltage cable fire are overload, short circuit, excessive contact resistance, insulation damage and high temperature baking. (1) Overload refers to the power or current of electrical equipment or wires exceeding its rated value. The main hazard of overload is that the conductor can convert electrical energy into heat energy under overload conditions, causing the conductor and its insulation to overheat locally. When the necessary temperature is reached, it can ignite nearby combustibles and form a fire. (2) Short circuit. When the electrical circuit is short-circuited, the branch load of the electrical circuit will be cut off. The current is inversely proportional to the change of the load impedance. When the impedance becomes very small, the current is often very large, so the heat generated is very large. At this time, If the insurance cannot be disconnected instantly, the conductor will catch fire, causing a fire. (3) Contact resistance. When the electrical lines overlap, the contacts are loose, and the voltage between the contacts is sufficient to break down the air in the gap and form air conduction. If the gap between the contacts is slightly larger and it happens to be the peak value of the power supply voltage fluctuation, an arc will be pulled out in the air, igniting nearby combustibles to form a fire. (4) The design load is small, and the electrical circuit is in or on the verge of overloading for a long time, which not only leads to the electrical circuit

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Below will tell you how to connect the low voltage cable
NEW

2022-12-13

Below will tell you how to connect the low voltage cable

The following will tell you how to connect low-voltage cables and how to connect low-voltage cables. Low-voltage cable connection requirements: 1. There should be no joints, especially in the line pipe. The cable joints should not cause fire, short circuit and poor contact. 2. The ceiling is wired, and the main line cannot be boarded. It is wrapped with fireproof tape to prevent lightning flash. 3. The method of wiring with crimping cap is T4 type, which can press four 4 mm² wires. In short, the connection of low-voltage cables should be orderly, marked and easy to maintain. Red neutral wire should be used for live wire, blue wire for live wire and yellow wire for ground wire. Low-voltage cables are generally connected by connecting pipes, which are divided into copper and aluminum according to their materials. A single material only needs copper or aluminum, and the connecting pipe needs to be twice as long as a single wire. If the cable materials are mixed, excessive copper and aluminum wiring pipes or bolts need to be used to fasten and lock with the three corners of steel wire ropes. The former must be pressed firmly with press tongs and heat shrinkable tubes are installed, the latter is locked by the 3-angle wire rope, and it is more troublesome to deal with the excessively large wiring head. It is only used when there is no pressure clamp or high altitude. In addition, there is a high-pressure self-adhesive treatment that is more convenient. Standard Specification and Precautions for Low Voltage Cable Installation Wire and Cable and Our Life

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Let's talk about the solution of local defects or cracks in low-voltage cables.
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2022-12-01

Let's talk about the solution of local defects or cracks in low-voltage cables.

Let's talk about solutions to local defects or cracks in low-voltage cables. Solutions to local defects or cracks in low-voltage cables In the daily use of wires and cables, we often encounter insulation cracks or local defects. So, how should low-voltage cable manufacturers solve these problems? Use a knife to trim the defects, cut into plastic blocks of the same slope shape and size at 45 angles, place them on the repaired part, fix them with pliers or screwdriver, then use a hot air speed welding torch for continuous welding, and press and flatten them with copper sheets. When welding plastics, cable manufacturers should pay attention to the hot air temperature of the welding torch not being too high, so as to prevent the plastics from being burnt at the repaired part. The repaired defects are tested by spark machine and have no breakdown. Use a knife to cut the defective part of the plastic layer into an inclined plane of 45, remove the plastic blocks or strips with the same shape, color, and thickness, fix them with pliers or screwdriver, connect them with a hot wind speed welding torch, and then compress and flatten them with a copper sheet, After the spark machine test, it is qualified without failure. Scrape off the plastic defects with a knife, fill the recessed part with the same plastic strip under the action of the hot-air plastic welding gun, and then flatten, flatten, and compact the defect repair part with a copper sheet. After the spark machine test, it is qualified without failure. Six major causes of low-voltage cable heating low-voltage cable heating, cable

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How to Prevent Fire Caused by Home Decoration Wire and Cable Load
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2022-11-22

How to Prevent Fire Caused by Home Decoration Wire and Cable Load

How to prevent the fire caused by the load of home decoration wires and cables During the operation of home decoration wires and cables, with the continuous burning of resistors, the line overload is easy to occur, and the temperature rise will cause fire accidents. How to prevent the fire caused by the load of home decoration wires and cables? 1. In the route design process, the volume of the place should be accurately checked, and the probability of increasing the new capacity in the future should be comprehensively considered to select the appropriate wire type. If the volume is relatively large, you should choose a thicker wire. Circuit principle and scientific and reasonable selection are the key factors to avoid overload. If the design selection is unreasonable, there will be a congenital security risk that can not be corrected. Some small programs and places are not carefully planned and judged, and they are extremely dangerous to choose and pave routes casually. A new household appliances, electrical equipment should comprehensively consider the bearing capacity of the original line, the original route does not meet the conditions, should be repositioned and updated. 2. Home improvement wire and cable shall be constructed and laid by qualified staff according to relevant standards. The laying standard of the line is directly related to the heat removal of the transmission line. Generally speaking, the line laying is not suitable for crossing flammable materials and accumulation, which will also lead to poor heat dissipation and heat accumulation of home decoration wires, which is likely to ignite surrounding flammable materials and improve fire safety.

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What are the potential safety hazards of using fake home improvement wires and cables
NEW

2022-11-15

What are the potential safety hazards of using fake home improvement wires and cables

What are the potential safety hazards of using fake and inferior home decoration wires and cables? As the main function of power transportation and signal transmission, China has been strictly controlling the quality of home decoration wires and cables, while some poor manufacturers will produce fake and inferior wires and cables in order to seek personal gain. The key problems of fake and inferior wire and cable include specifications, resistors, insulation sheath and other aspects. The following is an in-depth analysis of what hidden dangers this fake and shoddy commodity will cause. 1. After the safety accident of short-circuit fault (short-circuit fault) occurs in the home decoration wire and cable, the common fault of relay protection is not disconnected in posture, resulting in over-temperature of wire and cable and fire of cable sheath. 2. The compressive strength and elongation of the insulating sheath before aging are not closed, which immediately greatly shortens the service life of the wire and cable. In addition, in engineering or long-term plug-in and continuous high temperature environment, it is easy to cause insulation rupture, resulting in the exposure of energized electrical conductors, resulting in the risk of electric shock accident-type short-circuit fault. 3. For wires whose conductor resistance does not meet the requirements, when the conductor resistance exceeds the standard, the current damage on the lifting route will increase the heating of the wires and cables. The main reason for the failure of conductor resistance is that in order to control costs, the company will reduce copper, which accounts for 80% of material costs, or reduce conductance.

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Home improvement wire and cable and transport storage should pay attention to the following matters
NEW

2022-11-09

Home improvement wire and cable and transport storage should pay attention to the following matters

Home improvement wire and cable and transportation storage should pay attention to the following matters with the rapid development of social economy, the need for wires is also increasing. The storage and transportation of new wire and cable products are two important stages. If they are not properly maintained during transportation and storage, they can actually destroy their quality and use safety factor. Therefore, we must know what details should be paid attention to, better maintenance of home improvement wire. Matters needing attention in transportation and storage 1. During transportation, it is strictly forbidden to drop the home improvement wire or the cable reel with cable at high places, especially when the cable is thrown or dropped at ultra-low temperature (generally below 5 ℃), which may cause the insulation layer and the protective wire sleeve to crack. 2. To minimize the outdoor storage of household wires, cable tray can not be placed. 3. When lifting, it is strictly prohibited to lift multiple wire and cable at the same time. In transportation links such as vehicles and ships, use appropriate methods to prevent mutual collision or tipping, and avoid damage to cable machinery and equipment. 4. Home improvement wires can not be touched with acid, alkali and mineral oil, and these corrosive gas protection. There shall be no harmful substances that can destroy the insulation layer and corrode the metal in the warehouse where the cable is stored. 5. When keeping household wires, the goods should be rolled over frequently.

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Company Headquarters: 11th Floor, Tower 1, Dongju Jiaxin Business Center, Guandu District, Kunming City, Yunnan Province
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