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1.Take a closer look at the label printing samples. The address of the handwriting is unknown. Refers to the label on the label and the insulating cover. If there is a typo or a different shade of printing or the words are blurred, you must pay attention to it. 2.Insulate the skin with a hand, fade the color, remove the word quality. Refers to rubbing the insulation skin with your fingers. Some poorly insulated wire covers are easily discolored. This is especially true for red lines. After the rubbing, the skin color on the finger or the word printed on the skin is rubbed off. It is generally a poor quality line. 3.Then use a fingernail and a squatting line to draw down and peel off the skin. It refers to the use of fingernails and enamels to insulate the skin. It is generally a poor quality line that can be drawn down and smashed down. 4.Repeatedly bend the insulated wire and break it three to four times. It refers to the repeated bending of the insulated wire, and the poor quality of the insulating material of the poor quality wire is very poor. After the bending 3 to 4 times, the insulating layer will break. 5.Use fire to ignite the wire and leave the open flame for self-ignition. It refers to the ignition of the insulating layer, and it is the inferior line that can spontaneously ignite after leaving the open flame. Fine inner diameter and outer diameter, look at the weight of leather. It means that if the above five methods cannot be determined, the outer diameter and the core diameter of the insulated wire can also be measured. The allowable error is ±10%. If the measured value exceeds the allowable error, it is basically an inferior insulated wire.

First, the difference between flame-retardant cables and fire-resistant fire-resistant cables For flame-retardant cables, we require the IEC-332-1-2-3 standard at minimum, and the corresponding specification for fire-resistant and fire-resistant cables is IEC-331. The contents of the two assessments are different. (1) The fire-resistant fire-resistant cables and fire-retardant fire-proof cables have different technical structures and different functions. (2) Flame-retardant fire-retardant cables shall have flame-retardant functions in addition to their own use in practice, but they shall have flame-retardant functions, and fire-retardant and fire-resistant cables may not necessarily have fire-resistant functions. (3) Therefore, the use of fire-retardant and fire-retardant products is not an alternative to fire-resistant and fire-resistant cables. When looking at advertisements and product sample data, we should carefully study and analyze them carefully. Don't be fooled by advertisements or exaggerated propaganda. For example, some manufacturers advertise that cables have a long life span and are overloaded, which is 100 times the normal current carrying capacity. Do you dare to use it? It is hoped that these manufacturers will develop their own proprietary technologies and produce true fire-resistant fire-resistant cables, which will be sent to the National Fireproof Building Materials Quality Supervision and Inspection Center for formal inspection and testing according to standards. Third, the characteristics of flame-retardant fire-resistant fireproof cable At present, the German fire protection cable production plant has been able to produce pre-branched fire-retardant fire-resistant fire-resistant cables, regardless of the number of branches, the length of how much, do not need intermediate connectors and cable terminations. One-time delivery facilitates work on the construction site and meets our requirements: (1) The product has passed the national wire and cable quality supervision and inspection center and passed the test; passed the international standard of the British Standards Association (BS-6387c.wz), all tests pass, and the fire resistance standards are evaluated as follows: I. 950 °C flame power 180min without breakdown; II. Spraying with water at 650°C for 15 minutes without breakdown; III. Under 650°C flame, it withstands 15 minutes of knocking vibration without breakdown.

In recent years, frequent fire accidents have brought great challenges to the cable industry. When the cable encounters a fire, what steps should be taken? Or what should we do to prevent a cable fire accident before we encounter a fire? In order to prevent cable fire accidents, the following precautions should be taken: (1) Select cables that meet the thermal stability requirements. The selected cable, under normal conditions, can meet the heat requirements of the long-term rated load. In the case of a short circuit, it can meet short-term thermal stability and prevent the cable from overheating and catching fire. (2) Prevent running overload. When the cable is loaded and operated, the rated load operation is generally not exceeded. If the cable is overloaded, the overload running time of the cable must be strictly controlled so as to avoid overheating the cable and causing the cable to catch fire. (3) Observe the relevant regulations for cable laying. When laying cables, keep them away from heat sources and avoid parallel or cross-arrangement with steam pipes. If they are parallel or intersecting, they should maintain the specified distance and adopt heat insulation measures. All cables shall not be laid on the top or bottom of the heat pipes in parallel; in some pipes In the tunnel or ditch, laying of cables is generally avoided. If laying is required, thermal insulation measures shall be taken. Overlayed cables, especially plastics and rubber cables, shall have thermal insulation measures to prevent thermal influences such as heat pipes; when laying cables, The distance between cables, cables and heat pipes and other pipes, and between cables and roads, railways, buildings, etc., shall be in accordance with the provisions of the regulations; in addition, the cable should be left with a wave shape to prevent winter. (4) Regular inspections. The power cable should be regularly inspected, and the air temperature and cable temperature in the cable ditch should be regularly measured. In particular, the temperature of the large-capacity power cable and cable connector box should be recorded. Find and handle defects through inspections. (5) Close tightly the cable holes, holes and fire doors and partition walls. In order to prevent cable fires, all cable holes that pass through walls, floors, shafts, and cable trenches into control rooms, cable mezzanines, control cabinets, instrument cabinets, switch cabinets, etc. must be tightly closed (closed, flat, beautiful, and cabled). Do not suffer damage). (6) Strip the external jute sheath outside the buried cable. The buried cable has a layer of jute protective layer, such as dipping asphalt, which protects the cables in the direct burial area. When the buried cable enters the cable trench, tunnel, and shaft, the protective layer of jute, such as asphalt, is exposed. Stripped to reduce the risk of fire expansion. At the same time, the cover plate above the cable trench should be covered, and the cover plate is complete, strong, and the welding slag cannot easily fall in, reducing the possibility of cable fire. (7) Keep the cable tunnel clean and properly ventilated. The cable tunnel or channel shall be kept clean, no garbage and debris shall be piled up, and the accumulated water and accumulated oil in the tunnel and trench shall be promptly removed. In normal operation, the cable tunnel and the channel shall be properly ventilated. (8) Maintain good lighting of cable tunnels or channels. The lighting in cable layers, cable tunnels, or channels is often kept in good condition, and special ladders are provided for tunnels and trenches that need to be placed on and off to facilitate inspection of operation and suppression of cable fires. (9) Prevent fire from entering the cable trench. When carrying out open fire near the cable, measures should be taken to prevent the fire from entering the ditch.

For reasons of work, various types of cables, wires, network cables, and cable television lines are often used, but often only a few types are used. The commonly used methods and applications of cables, wires, network cables, and cable television lines are briefly described. induction. First, the meaning of various commonly used letters R-connecting flexible cable (wire), soft structure. V-insulated PVC. V-PVC insulation V-PVC sheath B-flat (flat). S-twisted type. A-tin or silver plating. F- high temperature P-bracketed shield P2- copper tape shield P22-steel tape armored Y-prefabricated, generally omitted, or polyolefin sheathed FD-product category code, refers to the branch cable. The Ministry of Construction standards to be promulgated are represented by FZ, which are essentially the same YJ-XLPE insulated V-PVC insulated or sheathed ZR-flame-retardant NH-refractory WDZ-Halogen-free low-smoke flame retardant WDN-None Halogen low smoke refractory type Second, cable knowledge Cables are usually divided into power cables and control cables. 1, the meaning of the cable symbol: [1]ZR-Flame Retardant, NH-Fire-Resistant, ZA(IA)-Intrinsically Safe [2] use. Power cable default representation, K-control cable, P-signal cable, DJ-computer cable [3] Insulation. V-polyvinyl chloride, Y-polyethylene, YJ-crosslinked polyethylene, X-rubber, Z-paper [4] Conductors. The T-copper core defaults to the L-aluminum core. [5] Inner sheath (sheath), V-PVC, Y-polyethylene, Q-lead, L-aluminium, H-rubber, HF-non-combustible rubber, LW-wrinkle aluminum sheath, F - Neoprene, N-butyl rubber sheath. [6] Features. Do not need to indicate that the package type, F-phase lead-phased phase-separated jacket, D-no oil, CY-oil, P-shielded, C-filter, Z-DC [7] Armored layer. 0-None, 2-double strip (24-steel strip, thick round wire), 3-thick round wire, 4-thick round wire (44-double round wire). [8] The outer layer. 0-None, 1-fiber layer, 2-PVC sheath, 3-PE sheath. [9] Rated voltage. Expressed in numbers, kV. 2, examples of commonly used cables: VV copper core PVC insulated PVC sheathed power cable. VV22 copper core PVC insulated PVC sheathed power cable . YJV XLPE insulated, PVC sheathed power cable 3, the meaning of the specification Specifications using the number of cores, nominal cross section and voltage level 1 Specification of single-core branch cable: Number of cables in the same loop*(1*nominal section), 0.6/1KV, For example: 4*(1*185)+1*950.6/1KV 2 Multi-core stranded branch cable specification notation: number of identical loop cables* nominal cross section, 0.6/1KV, For example: 4*185+1*950.6/1KV Third, wire knowledge 1, the general meaning of the wire symbol: [1] Code. B-wire (sometimes not indicated) [2] Conductors. T-copper (default), L-aluminum, R-soft copper [3] Insulation. V-PVC, X-rubber, F-chloroprene rubber [4] Sheath. V-polyvinyl chloride [5] Others. R-soft wire, P-shielded, B-parallel 2, examples of commonly used wires: (1), BX, BLX: rubber insulated wire. Fixed laying in indoor or outdoor, bright, dark or wear pipe, as equipment installation line. (2), BXF, BLXF: neoprene insulated wire. With BX type, good weather resistance, suitable for outdoor use. (3), BXHF, BXLHF: Rubber insulated and sheathed wires. With the BX type, it is suitable for humid places and as an outdoor entrance line. (4), BV, BLV: PVC insulated wire. Same type BX, but better moisture resistance and weather resistance. (5), BVR: PVC insulated soft wire. The same type BV is only used for soft installation. (6), BV-10 V, BLV-105: heat-resistant 105 °C PVC insulated wire. Same as Type BV, used in high temperature environments of 45°C and above. (7), BVR-105: heat-resistant 105 °C PVC insulated soft wire. With BVR type, used in high temperature environments of 45°C and above. Fourth, video file transmission material (such as: cable TV) knowledge Video file signal transmission cable. There are roughly three kinds of coaxial cables, twisted pairs, and optical fibers. Describe the commonly used coaxial cable knowledge: 1. Classification of Coaxial Cables: Coaxial cables for video file transmission are SYV75-III, SYV75-V, SYV75-7, SYV75-9, SYV75-12 2, the meaning of the letters: SYV75-5-1 (A, B, C) SYV75-5-41 (A, B, C) SYV75-5-2 (A, B, C) S stands for RF coaxial cable Y represents polyethylene (PE) insulation V stands for polyvinyl chloride (PVC) jacket 75 stands for characteristic impedance 75 ohms 5 represents the approximate value of the insulating outer warp -1, -41 or -2 represents the structural form code. General -1 or -41 represents the inner conductor is single-core; -2 represents the inner conductor is multi-core A: 64 series B: 96 series C: 128 series

New functional products will be released soon Some functional sockets will be available this year by CIXI KYFEN ELECTRONICS CO.,LTD. With the general socket fulling the market, customers for socket quality and safety requirements are higher and higher,the Kyfen company are developing some model power strip with surge protecrion or overload protection to ensure more safe for users. The series of power strip with overload protection or surge protection are from 3-way to 6-way, flame retardant PP materials, light switch or button are alternative, can power multiple household appliances at the same time.