China Zhenglan Cable Technology Co., Ltd Company News

Here comes China's lunar new year Spring Festival, all Zhenglan people will be on holiday from February 6 to 17th. See you then. May you be happy and prosperous, Good luck in the year of the ox

The main problem facing specifiers and contractors is the confusion over terminology and standards. Is LSHF (Low Smoke Halogen Free) the same as LSF (Low Smoke and Fume)? These terms are all widely used within the cable industry and we still encounter confusion from contractors surrounding the difference between LSF and LSHF cables.   LSF is a somewhat meaningless term applying to products that are often PVC based, which may emit up to 22% Hydrogen Chloride (HCl) gas when burnt and give off black smoke. Hydrogen Chloride gas can be deadly to people and damage sensitive equipment and black smoke can obscure exit routes in the event of a fire. By way of comparison, standard PVC gives off up to 28% HCl.   LSHF cables are those which emit no more than 0.5% HCl when burned. There is a significant difference between the two products and it is vital that specifiers know which they are choosing.   There has been a shift in recent years to using newly developed compounds that emit less of the harmful gases, particularly halogens, but still perform well in other respects. The difficulty for the cable buyer is that there are no specific standards for LSF cables. Ordinary PVC emits approximately 28% HCl, whilst modified PVC could give off a massive 22% HCl and still be sold as LSF.   If you want to be absolutely certain of what you are installing you should insist on a cable that uses insulation and sheathing materials that do not emit any Halogens and have reduced smoke emission properties. These are termed LSHF (Low Smoke Halogen Free), LS0H, LSZH (Low Smoke Zero Halogen) or sometimes OHLS (Zero Halogen Low Smoke). These products must emit no more than 0.5% HCl.   Also, don’t accept standard PVC cables over-sheathed with an LSHF jacket or cables with PVC insulation. When the jacket burns through, the PVC inner sheath or insulation will give off poisonous gases in just the same way as if the LSHF jacket wasn’t there! Another common misunderstanding is that LSF or LSHF cable is also flame retardant. This is not necessarily true. The cables may spread the fire even though minimal fumes are being emitted.

All have been so hard in the past days of 2020. While under your support, we got some achievements. We appreciated that so much. In the coming days, hope you will still come to us.   Upon this Christmas and New Year Festival, we want to send our best wishes to you and your family. Hope all of you to be safe, healthy, happy and your business smooth and bloom.   Zhenglan Cable Technology Co., Ltd will continue to offer you products with the best quality and in-time service. Wecome your inquiry of overhead power transmission use bare conductor& insulated cables, LV&MV power cables, instrument use control cable, fixed installation use building wires.

The factors affecting copper prices include supply, demand, bulk commodity spot sales, market pressure, and current inventory levels etc.,   1. Supply and demand According to the principle of economics, when the supply of a commodity exceeds the demand, its price will fall, otherwise it will rise. At the same time, price will affect supply and demand in turn. When commodity prices rise, supply will increase and demand will decrease. On the contrary, demand will rise and supply will decrease. Therefore, price and supply and demand will affect each other. An important index reflecting the relationship between supply and demand is inventory, which is generally measured by stock exchange.   2. economic situation Copper is an important industrial raw material, and its demand is closely related to the economic situation. When the economy grows, the copper demand increases, which leads to the rise of copper price. When the economy is depressed, the copper demand shrinks and the copper price falls. 3. Import and export policy The import and export policy, especially the tariff policy, is an important means to balance the domestic supply and demand by adjusting the import and export cost of a commodity and controlling the import and export volume of a commodity. 4. Change of development trend of copper industry Consumption is the direct factor affecting copper price, and the development of copper industry is an important factor affecting consumption. With the rapid development of science and technology, the application scope of copper is constantly expanding, and copper has begun to play a role in the fields of medicine, biology, superconductivity and environmental protection. All of these will affect copper consumption in varying degrees. 5. Production cost of copper Production cost is the basis of measuring commodity price level. The production cost of copper includes smelting cost and refining cost. The most common economic analysis is to adopt "cash flow break even cost", which decreases with the increase of by-product value. 6. Trading direction of funds Although the fund industry has a long history, it did not develop vigorously until the 1990s. At the same time, the degree of fund participation in commodity futures trading has also increased significantly. From the evolution of copper market in recent ten years, the fund has played an important role in many big market. Of course, there are also similar exchange rates will have a certain impact on copper prices, but the fundamental factor determining the trend of copper prices is the relationship between supply and demand of copper

Following are some Q&A people interested about wire and cables:   1. What types of commonly used wires and cables are classified by purpose? Answer: According to the purpose, it can be divided into bare conductors , insulated wires, heat-resistant wires, shielded wires, power cables, control cables, communication cables, radio frequency cables, etc. 2.What is the difference between ACSR cable and AAAC cable? AAAC:This bare concentric-lay-stranded conductor, made from round aluminum alloy 6201 -T81 wires, is constructed with a central core surrounded by one or more layers of helically laid wires. it provide better corrosion resistance than the one produced by the aluminum conductor steel reinforced(ACSR). ACSR: This bare concentric-lay-stranded conductor is made from round aluminum 1350-H19 (extra hard) wires and round zinc-coated or aluminum-coated steel core wire(s) to be used as overhead electrical conductors.it provides better strength than AAAC cable. 3. What kinds of insulated wires are there? Answer: There are the following types of insulated wires: PVC insulated wires, PVC insulated cords, nitrile and polyvinyl chloride compound insulated cords, rubber insulated wires, direct buried aluminum core plastic insulated wires for agricultural use, and rubber insulated cotton yarn Textile cords, PVC insulated nylon sheathed wires, PVC insulated cords for power and lighting, etc. 4. What kind of occasion is the cable tray suitable for? Answer: The cable tray is suitable for the overhead laying of power cables and control cables indoors and outdoors in general industrial and mining enterprises, and can also be used for indoor and outdoor installations in telecommunications, radio and television departments. 5. What are the cable accessories? Answer: Commonly used electrical accessories include cable terminal junction box, cable intermediate junction box, connecting pipe and terminal block, steel plate junction box, cable tray, etc. 6. What is the cable middle connector? Answer: The device that connects the cable and the cable’s conductor, insulation shielding layer and protective layer to connect the cable line is called the cable intermediate joint. 7. What is electrical main wiring? Answer: The electrical main wiring is the connection method of the main electrical equipment and the bus in power plants and substations, including the connection of the main bus and the auxiliary power system according to certain functional requirements. 8.When choosing the cross section of the power cable, which regulations should be followed? 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 core must meet the requirements of stability of the power supply system when it is short-circuited; (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 should enable the protection device to operate reliably. 9. What are the advantages of XLPE cables and oil-paper cables? Answer: (1) Easy to install, because it allows a small minimum bending radius and light weight; (2) Not restricted by line drop; (3) Good thermal performance, high allowable working temperature and large transmission capacity; (4) The cable accessories are simple and all are dry structure; (5) Simple operation and maintenance, no oil leakage problem; (6) The price is lower; (7) High reliability and low failure rate; (8) There are few manufacturing procedures, simple process and remarkable economic benefits.  

Wire. A slender rod or filament of drawn metal. (This definition restricts the term wire to what would ordinarily be understood by the term solid wire. In the definition the word slender is used in the sense that the length is great in comparison with the diameter.   If a wire is covered with insulation, it is properly called an insulated wire, although the term wire refers primarily to the metal; nevertheless, when the context shows that the wire is insulated, the term wire will be understood to include the insulation.)   Conductor. A wire or combination of wires not insulated from one another, suitable for carrying a single electric current. (The term conductor does not include a combination of conductors insulated from one another, which would be suitable for carrying several different electric currents. Rolled conductors, such as busbars, are, of course, conductors but are not considered under the terminology given here.)   Stranded Conductor. A conductor composed of a group of wires or any combination of groups of wires. (The wires in a stranded conductor are usually twisted or braided together.)   Cable. A stranded conductor (single-conductor cable) or a combination of conductors insulated from one another (multiconductor cable). The component conductors of the second kind of cable may be either solid or stranded, and this kind may or may not have a common insulating covering. The first kind of cable is a single conductor, while the second kind is a group of several conductors.   Strand. One of the wires or groups of wires of any stranded conductor.   Stranded Wire. A group of small wires used as a single wire. (A wire has been defined as a slender rod or filament of drawn metal. If such a filament is subdivided into several smaller filaments or strands and is used as a single wire, it is called stranded wire.   There is no sharp dividing line of size between a stranded wire and a cable. If used as a wire, for example in winding inductance coils or magnets, it is called a stranded wire and not a cable. If it is substantially insulated, it is called a cord, defined below.)   Cord. A small cable, very flexible and substantially insulated to withstand wear. (There is no sharp dividing line in respect to size between a cord and a cable and likewise no sharp dividing line in respect to the character of insulation between a cord and a stranded wire.)   Concentric Strand. A strand composed of a central core surrounded by one or more layers of helically laid wires or groups of wires.