Choose the wire and cable, quickly identify the type!

The main function of wire and cable is to transmit electric energy, signal and realize electromagnetic conversion. The transmission of electric power, such as power cable, overhead line, etc., is the same as shaft ABC Cable, and the wire with electromagnetic conversion is like paint wrapped wire. If you choose a wire or cable, you need to quickly identify the type and type to select the right cable to use.

According to the number of transmission lines of each other with each other which are fixed together, the insulated wires can be divided into single core wires and multi-core wires. Multi core wires can also fix multiple single core wires in one insulating sheath. The multi-core wires in the same sheath can be as many as 24 cores. The parallel multi-core line is indicated by “B”, and the twisted multi-core wire is indicated by “s”.
Insulated wires can be divided into single wire and multi-core wire according to the stock number of each transmission line. Generally, the insulated wires above 6 square mm are all multi-core wires. The insulated wires with 6 square mm and below can be single wires and can also be multi-core wires. We call the single wire of 6 square mm and the following as hard wire, and multi-core wire is called copper wire.
Hard wire is indicated by “B” and copper wire is indicated by “R”. The common insulating materials of ACSR Cable are polyethylene and high pressure polyethylene. The “V” of PE indicates that “Y” is used for high-pressure polyethylene.

Bv copper core polyethylene insulated wire; BLV aluminum core polyethylene insulated wire; BVV copper core polyethylene insulation layer polyethylene protective cable; Blvv aluminum core polyethylene insulation layer polyethylene protective cable; BVR copper core polyethylene insulation copper wire;
RV copper core polyethylene insulation layer is installed with copper wire; RVB copper core polyethylene insulation layer flat electrode connecting wire copper wire; BVS copper core polyethylene insulation layer twisted copper wire; RVV copper core polyethylene insulation layer polyethylene wire sheath copper wire;
BYR high voltage polyethylene insulated soft cable; Byvr high voltage polyethylene insulation layer polyethylene wire sheath copper wire; Ry high voltage polyethylene insulated copper wire; RYV high voltage polyethylene insulation layer polyethylene wire sheath copper wire;
BVVB copper core polyethylene insulation layer polyethylene protective wire sleeve flat cable; BLVVB aluminum core polyethylene insulation layer polyethylene protective wire sleeve flat cable; Bv-105 copper core high temperature resistant 105 ℃ polyethylene insulated wire.

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Is the cable conductor detected by the cable nose in accordance with the national standard

The AAC Cable nose is often used for the end connection and continuation of the cable, which can make the connection between the cable and electrical appliances more firm and safer. Cable companies often receive customer complaints: with the corresponding specifications of the wire nose through the corresponding specifications of the conductor, found that the wire nose is larger than the outer diameter of the cable conductor! If it is suspected that the cable is a non-standard product, let the cable enterprise send someone to explain and deal with it on site immediately; In particular, with the use of “special-shaped wire stranded cable conductor and its production method” by cable enterprises, the compression coefficient of cable conductor has increased from 0.90 to more than 0.98, and the outer diameter of cable conductor has decreased by more than 5%. In this way, cable users worry about whether the cable is non-standard or wrong cable specification after receiving the goods? Today, I want to explain to you: why is the cable nose larger than the outer diameter of the cable conductor?

The reason why the cable nose is larger than the outer diameter of the cable conductor is mainly to reduce the contact resistance of the connection and strengthen the local heat dissipation capacity. For a cable, the resistance of the whole length is evenly distributed, but no matter how much pressure you use to install the connection of the cable nose, the resistance of the contact part is always greater than that of the non connection part of the cable, resulting in serious local heating, The solution is to increase the contact area and reduce the contact resistance. At the same time, the larger the nose, its heat dissipation capacity will be higher. Generally, the area of the cable nose is 30-50% larger than the corresponding specification of the cable conductor, because the cable conductor is sometimes rolled into a fan or tile shape, which is not a pure circle. Generally, it needs to be compressed by a hydraulic press and then turned into a circle. If the inner hole of the cable nose is designed according to the nominal outer diameter of the cable conductor, some special-shaped conductors cannot be penetrated.

For more information on cables, click Joy ’cable Blog

How to use insulation megger to measure insulation resistance of power cable

1. The performance of power cable insulation material decreases irreversibly with service time and environment, which is called insulation aging. The manifestations of insulation aging are as follows: breakdown strength decreases, dielectric loss tangent increases, local leakage and discharge increase, mechanical strength and other properties decrease.
2. In the aging process, the time required for the insulation performance to fall below the specified allowable range is usually called insulation life. Under normal service conditions, the service life of XLPE cable and oil immersed armored cable is 30 years and 40 years respectively. Under the action of power frequency AC voltage, partial discharge in insulation material is the main reason for insulation aging of power cable. In the oil immersed cable, the partial discharge leads to the decomposition of impregnant and paper fiber and the formation of waxy crystalline state. In XLPE cables, the insulation material is gradually damaged by partial discharge, forming micropores, cracks and dendritic buds, which gradually develop in depth in the insulation material until insulation breakdown.
3. The insulation aging degree of power cable can be measured by insulation resistance test and dielectric loss tangent tan δ Test, withstand voltage test and other electrical tests. Insulation resistance test shall be conducted for power cables below 6kV. 500 ~ 1000V grounding resistance tester (megohmmeter or megger) is used for cables with voltage below 1KV; 1000 ~ 2500V grounding resistance tester is used for 1kV and above cable.

The following items should be noted during the test.
① The method of measuring the insulation resistance is suitable for the cable which is not too long. Measure the insulation resistance and calculate the absorption ratio. Under the same test conditions, the better the insulation value is, the greater the absorption ratio is.
② Generally, the insulation resistance value of power cable is not specified, and the test value should be compared with the original record. Generally, the insulation resistance of 1 ~ 3KV cable should not be less than 200m Ω; 6 ~ 10kV cable should not be less than 400m Ω; 35kV Cable should not be less than 600m Ω; The unbalance coefficient of three-phase insulation shall not be greater than 2.5. During the test, the temperature, air humidity and other weather conditions shall be recorded for reference.
③ Before measurement, the cable shall be fully discharged, that is, the cable core and the metal sheath of the cable shall be grounded.
④ The surface of cable terminal bushing shall be wiped clean before testing. Use the other insulating core of the cable as the shielding circuit, connect the conductors at both ends of the insulated core to the bushing or insulation of the insulated core to be tested with flexible metal wires, wind them for several turns, and then connect them to the shielding terminal g of the grounding resistance tester.
⑤ After each test, the cable shall be grounded and discharged. The longer the cable line is, the better the insulation condition is, and the longer the grounding discharge time is, generally not less than 1min.

Several points for attention in extrusion of silicone rubber cable


This paper presents the application of silicone rubber in the acsr cable industry, some problems and solutions in the production of silicone rubber cable.
Key words: silicone rubber, mixing, extrusion, coke burning, foaming, technology

1、 Preface

Because of its high heat resistance and excellent cold resistance, silicone rubber has a long-term temperature range of – 90-250 ℃, and has excellent electrical insulation and aging resistance. Therefore, the development of silicone rubber in cable industry is very rapid.
In the past few decades, the silicone rubber industry has been facing the challenge of meeting the growing demand of modern extrusion products market. The wear resistance, cutting and penetrating resistance, chemical resistance, oil resistance and mechanical strength of silicone rubber have been improved. As a material with high temperature of thermal aging, silicone rubber has been widely used in manufacturers and users because of its value and reliability. Nowadays, the application of silicone rubber in the wire and cable industry is developing continuously, mainly used as insulation and sheath of ship cable, aviation wire, motor lead wire, heating wire and many special purposes (such as atomic energy industry, aerospace industry, metallurgy industry, etc.).
In recent two years, the company has received orders from customers about silicone rubber insulation and sheath cables. However, because such products are not the leading products of the company, the processing technology and production equipment are not perfect. Although we have encountered many difficulties in the production process, after the joint efforts of the family, the products are delivered to the customers on time, We have learned a lot from it.

2、 Problems encountered in the production of silicone rubber cable

1. after mixing and adding sulfur, the rubber material is easy to burn and contains a lot of impurities during extrusion, which leads to breakdown of insulation voltage.
2. loose shell and blister phenomenon occur during the extrusion process of sheath.

3、 Solutions

1. technical requirements for mixing and returning
Although the processing equipment of silicone rubber is not different from that of organic rubber, it is better not to use the same open mill to process organic rubber and silicone rubber. It is better to have a special operation room for silica gel and keep the environment clean, because the mechanical and electrical properties of the polluted silicone rubber should be reduced. If special processing equipment and processing site cannot be configured for silicone rubber, it is necessary to pay attention to completely isolate the polluting materials from the coordination aids of silicone rubber and silicone rubber, because most of the impurities are from the mixing of rubber.
Because of the characteristics of silicone rubber, the plastic properties of the rubber material which need to be recycled will change after the re refining, and it is easy to pack it on the roller with fast speed. Cooling water should be put into the roller of the mixer to avoid burning of the rubber. Special attention should be paid to the use of the rubber containing bis 2.4-dichlorobenzoyl peroxide as the curing system. Because the decomposition temperature of bis 2.4-dichlorobenzoyl is about 45 ℃, the decomposition products 2.4-dichlorobenzoic acid and 2.4-dichlorobenzene are not volatile, and the rubber materials are easy to burn. In order to obtain high quality products, the following basic steps must be followed when mixing silicone rubber:
(1) . carefully weigh each kind of coordination components (such as flame retardant, vulcanizing agent, color masterbatch, etc.).
(2) . after putting the pure rubber or reinforcing rubber on the open mixer, adjust the roll distance to make the silicone rubber wrap on the roller with fast speed and fully return to the refining. Pure silicone rubber can be filled with only a little reflexion or no return refining. However, due to the silica in the reinforced silicone rubber, it must be fully refined. As long as the rubber is wrapped on the roller with high speed, the degree of re refining is appropriate.

(3) . if necessary, flame retardant, color master material, etc. shall be added to the adhesive. Some fillers fall into the receiving tray through the roller during mixing, and they should be collected and added to the rubber before the next filling is added. Rubber scraper is often used to scrape the filler from the receiving plate. It is better not to use brush, because some brush hairs may fall off the brush and mix them into the rubber. It is especially important to note that all fillers can not be added to the rubber at one time, but should be added in batches in 2-3 times. Every batch of filler is added, the rubber should be fully turned over. This can ensure the packing is evenly distributed and avoid the formation of hard packing clots. Reasonable roll distance can ensure the best mixing speed and quality of rubber.
(4) . finally, the vulcanizing agent is added to the rubber. Because the vulcanizing agent we currently use is 2.4-dichlorobenzoyl peroxide, when the rubber is too hot (no more than 4O ℃), no vulcanizing agent is added, otherwise, partial pre curing will occur, which will lead to the loss of the rubber or vulcanizer. Enough cooling water is put into the roller to avoid overheating of rubber. Finally, in order to make the vulcanizate disperse evenly, the whole roll of rubber material should be thin through several times.
2. correct use of filter screen and rubber filter pad
The filter screen is usually composed of 20-40 mesh filter plate and 60-100 mesh stainless steel filter with fine mesh. Some manufacturers do not like to extrude directly with the filter screen, because this can improve the extrusion speed and sometimes eliminate the possibility of heat generation and coke burning near the rubber filter plate. However, the use of the filter screen can not be ignored, because it plays a significant role in removing impurities and dispersed filler particles in the rubber. At the same time, the filter screen can also exclude the air in the rubber material during mixing and back mixing, especially for the softer rubber.
Because silicone rubber is only slightly thermoplastic and is not easy to be subjected to flow stress or shear strain in its unvulcanized state, the design of filter plate is not the key. Most filter plate designs are suitable for silicone rubber processing.
3. selection of extrusion equipment
In terms of equipment selection, we have no choice because we have no special silicon rubber cable production equipment at all. Among the three continuous vulcanization production equipments we currently use, the equipment that can be used for the production of silicone rubber is as follows: Φ 65/ Φ The 90 steam continuous vulcanization and extrusion machine and PLCV salt bath continuous vulcanization and extrusion machine.
4. process exploration and improvement
Because silicone cable is not our regular product, we always feel the stone across the river when we produce silicone cable. We used the insulation extrusion separately Φ 65/ Φ 90 steam continuous vulcanization and extrusion machine and PLCV continuous vulcanization extruder. But because Φ 65/ Φ The expansion pipe cannot be connected to the head of the 90 steam continuous rubber extruder, because the temperature of the head will rise rapidly after the expansion pipe is connected to the head under the steam heating, which leads to the vulcanization of silicone rubber in advance during extrusion. So in actual production, we do not connect expansion pipe to the head, but use steam in open mode, which will cause the steam pressure can not be applied too much, which affects the production speed and waste a lot of steam. When PLCV unit is in insulation extrusion, under the condition of controlling extrusion temperature, extrusion is not too big, only 0.2MPa pressure or no pressure is needed to meet the product requirements.
We are producing a number of single core cables with silicone rubber insulation and rubber sheath. Because the customers require that the insulation and sheath can be easily stripped, this means that the double layer co extrusion process we usually adopt in the production of single core cables can no longer be used. When the insulation extrusion is ready for the sheath extrusion, the problem arises: the silicone rubber insulation layer in the inner mold of the insulating wire core is easy to be driven up, which blocks the inner mold, and the bubble opening of the sheath after extrusion of the sheath. After repeated tests, we have adopted a layer of non-woven fabric in the insulation core to provide a storage space for the gas released by the silicone rubber insulation during secondary vulcanization. Under the condition of pipe pressure of 0.2-0.3mpa, the problem of being caught and blistering of sheath in the inner mold of insulation is solved.
In September, 2006, a customer customized a silicon rubber insulated silicone rubber sheath frequency conversion cable. Because the core of the insulating wire is formed, the copper tape is wrapped as the shielding layer. In order to prevent water from entering the sheath during the extrusion of the sheath, we first adopt the method of sealing the finished product head and then pressurizing, but the problems of sheath loose shell, blistering and explosion are also appeared. It is proved that we also use the method of wrapping a layer of non-woven cloth outside the shield layer of copper tape, and pressing when the head enters the vulcanizing tube 5m, which solves the problems of sheath loose shell, blistering and explosion.
In view of the success of the last few times, we blindly believe that non-woven fabric can solve the problems in the production of silicone rubber cable, but it is not all silicone rubber cables can produce qualified products by wrapping the non-woven fabric on the insulation. When the sheath is extruded after the multi-core cable is formed, although the non-woven cloth is wrapped, it is often because the cable is not filled enough, the melt pressure is not enough during the extrusion of the sheath, and the silicone rubber cannot be squeezed into the gap of insufficient filling, but the phenomenon of luller appears after the vulcanization tube is pressurized and vulcanized. Therefore, when the sheath is extruded after the multi-core cable is formed, we do not agree to add filling and wrapping non-woven cloth when the cable is formed, because the cable core has enough clearance to store the gas released by the silicone rubber insulation during secondary vulcanization. As long as the pipe pressure is applied properly, the loose shell and blister and the dew phenomenon of the sheath can be avoided completely.

4、 Concluding remarks

In conclusion, through the analysis of the problems encountered in the production process, we can not grasp the special points, and find out the causes of the problems fundamentally through the phenomenon and adopt practical technology and technical measures to solve the problems. We believe that through our efforts, the production process of silicone rubber cable will be mature, the quality of products will be improved, and the silicone rubber cable will gradually become our leading product, and the market competitiveness of rubber sheath cable will be enhanced.

Laying and installation of pre branched cables

1、 Laying and installation of pre branch cable
Prepare for laying and installation according to the requirements of design drawings and be familiar with the laying direction and location of cables.
(1) Formulate construction plan and organize professional construction personnel.
(2) Prepare for installation of tools and equipment.
(3) Verify the abc cable model and specification and packing sequence.
(4) Verify the accessories and assign the installation site of accessories to the construction party.
(5) Place cable tray on the cable release frame.
(6) When the cable is installed vertically, the cable laying frame is lower than the floor, and the cable is lifted by winch or pulley block through the rope. Professional construction personnel shall be required for each floor. As for the terminal, hang the cable on the installed hook
(7) When the cable is installed horizontally, the cable setting out frame shall be set by the professional construction personnel (one person every two meters and the commander) as for the receiving position.

(8) Fix the intermediate part of the main and branch lines of prefabricated branch cables as required.
(9) Connect the main line and branch line with the electrical control device in phase sequence.
(10) After installation, clean the site, measure the insulation resistance of each circuit connected to each phase of prefabricated branch cable.
(11) Fill in the construction record.
2、 Precautions during laying and installation
(1) When laying, it is necessary to use the vertical hoisting as far as possible. When the construction site is restricted or special requirements are required, reverse installation can be used. No matter which setting method, the branch line shall not be released in advance in the process to prevent the branch body from scratching when passing through the hole and avoid being subjected to excessive mechanical external force.
(2) During lifting and hoisting, the cable with a weight of more than 4 times the strength must be selected. After laying, the upper and lower installation and fixing fixture shall be carried out first.
(3) The bending radius of cable shall not be less than 25d during laying and installation.
(4) Metal clamps are not allowed when fixing single core prefabricated branch cables.
(5) When connecting the main line and branch line with the receiving and electric measuring apparatus, the metal clamp must be used and the metal type of the clamp shall be selected correctly.

(6) The spreader must be installed on the load-bearing wall.

Advantages of BTTZ rigid mineral insulated cable

Due to the special structure of BTTZ rigid mineral insulated cables, it has some characteristics different from traditional cables; it is also the most superior fire resistance characteristic of mineral insulated cables.
Advantages of BTTZ rigid mineral insulated cable
1) Completely fireproof BTTZ cable itself does not burn at all, and it will not cause a fire source at the same time. Even in the case of flame barbecue, as long as the flame temperature is lower than the melting point of copper, the cable can be used without replacement after the flame is eliminated. In the case of being grilled by flames, no toxic smoke and gas will be produced.

2) Strong overload protection capability When the line is overloaded, the cable will not be damaged as long as the heat does not reach the melting point of copper. Even if the breakdown occurs instantaneously, the magnesium oxide crystal at the breakdown will not form carbides. After the overload is eliminated, the cable performance will not change, and normal use can still be continued.
3) High working temperature Since the melting point of the insulating layer of magnesium oxide crystal is much higher than the melting point of copper, the maximum normal working temperature of the cable can reach 250°C, and it can continue to operate at a temperature close to the melting point of copper of 1083°C in the short term.
4) Good anti-corrosion and explosion-proof performance. As the seamless copper tube is used as the sheath, the BTTZ cable has the performance of waterproof, moisture, oil and some chemical substances. The copper tube has considerable mechanical strength, so it has better explosion-proof performance.

5) Long service life BTTZ cables are all made of inorganic materials, so there is no insulation aging, and the service life can reach more than 3 times that of ordinary cables.
6) Greater flexibility in laying BTTZ cables can be laid on the bridge with ordinary cables, and can also be laid with special brackets, which is more flexible than ordinary cable laying. It also saves the investment in cable bridges and reduces the overall cost of the project.

Analysis on the fireproof effect of cables

What should I do if the cable’s fire protection effect is not good? Try mineral insulated cables!
Is the cable’s fireproof effect poor? Have you tried mineral insulated fireproof cables! Mineral insulated fireproof cables not only have the characteristics of fire resistance, high temperature resistance and corrosion resistance, but also good waterproof effect, light weight and long life.
(1) In order to prevent electrical fires caused by the quality of the wires and cables themselves, qualified wires and cables must be selected;
(2) The aluminum conductor joints are prone to temperature rise and poor contact due to oxidation. Therefore, copper core wires and cables should be selected as a priority to reduce fire hazards.
(3) For cross-linked polyethylene insulated wires and cables, its electrical and physical properties are better than other wires and cables. It has the advantages of long life, good water resistance, good corrosion resistance, and less harmful combustion products, so it is insulated with polyethylene. Wire and cable (YJV) can be used as a priority;

(4) Because flame-retardant wires and cables can effectively slow down or even prevent the expansion and spread of fire, the use of flame-retardant wires and cables can control the fire at the initial stage of the fire to avoid greater losses, so flame-retardant wires and cables should be selected;
(5) In order to ensure that the electrical circuits can be energized normally during a period of fire, fire-resistant wires and cables should be selected;
(6) Try to use halogen-free low-smoke flame-retardant wire and cable or low-halogen low-smoke flame-retardant wire and cable to avoid generating a large amount of smoke and corrosive gas;

(7) On the one hand, mineral insulated cables provide excellent low grounding resistance and save a grounding wire than other cables. On the other hand, they can effectively ensure the safe operation of workers; for fire-fighting electrical equipment, it should be preferred Mineral insulated fire-resistant cable

Precautions for choosing household powercable

In home decoration, water and electricity decoration is the most important, especially the electrical part, because it involves the safety of electricity use. If there is a problem with the electrical decoration, it may directly affect the safety of the family and the consequences are quite serious. Therefore, whether it is the wiring, connection, or purchase of PE Cable, there must be reasonable planning and prior understanding.
At present, there are two types of wires for household use on the market, single-core and multi-core. Single-core wire means that the internal conductor is a relatively thick copper core, and the multi-core wire is twisted together by multiple thin copper cores. In comparison, single-core wires have higher hardness, and multi-core wires are softer, and their advantages and disadvantages are also obvious. You need to choose according to your own needs.

220V alternating current is used in the family, whether it is a single-core wire or a multi-core cable, as long as the qualified product is suitable for working under such conditions, the performance of the single-core wire will be more stable and the surface area It is small, not easy to be oxidized, and has higher mechanical strength. Multi-core cables are more flexible and easier to pull and bend, which is more convenient in the installation process, and it is not easy to damage the wires. In terms of price, the price of a single core is slightly cheaper, so when considering whether to use a single core or a multi-core wire, you need to choose according to your own needs and the characteristics of the wire.

In addition, when choosingSingle core cable, the most important thing is to see whether it meets the national standard. It cannot be a shoddy non-standard product. There are manufacturers, specifications, wire diameters, certification marks, and anti-counterfeiting queries on the wires. As for the amount of wire to choose at home, it should be determined according to the number and requirements of electrical appliances in the home. Generally speaking, the light wire uses 1.5 square wire, the socket uses 2.5 square wire. There are more electrical appliances in the kitchen and bathroom, and the power is large. It is best to use 4 square wires, vertical air conditioners use 4 square wires, and central air conditioners use 6 square line.

Development of high flexible fireproof cable

With the development of society, the scale of the city has been expanding, high-rise buildings have been emerging, and the number of important buildings has been increasing. The fire caused by the electric line, especially the huge fire accident, endangers the safety of life and property, and some fatal and huge fire, often causes a series of social problems and accountability. Once the fire happens, rescue is very important, fire pump, fire smoke exhaust, emergency lighting, fire elevator and other rescue equipment become the protection of people's escape, and these protection "lifeline" is the fire-proof cable. Due to the frequent occurrence and serious consequences of fire, more and more attention has been paid to the performance and testing of fire-resistant cables. Table 1 gives examples of the structure and standard test conditions of fire-resistant cables in some countries and regions, from Table 1, we can see the different requirements of GB, IEC, BS, AS for the test performance of fire-proof cable. China fire-resistant cables mainly implement the national standards, fire resistance requirements through BS 6387 or BS8491 fire-resistant + vibration + spray fire test.

At present, the fire-proof cables on the market are mainly divided into two categories from insulating materials, namely, magnesium oxide insulated fire-proof cables and mica-mineral compound insulated fire-proof cables, the common custom is respectively called the rigid fireproof cable and the flexible fireproof cable. Because of the difference of structure design and material technology, the two kinds of cables have their own characteristics and need to be improved. As a rigid fireproof cable, it has many advantages, such as high temperature resistance, radiation resistance, long life and good earthing, etc. . The other category is flexible fireproof cable with twisted conductor + mineral composite insulation + Metal Sheath or fireproof mud composite sheath, theoretically speaking, tubular metal or metal sheathed fireproof cable after mechanical deformation through rolling, the flexibility is mainly relative to solid conductors, and the flexibility of fireproof cables with fireproof mud insulation is limited by the hardness of the fireproof mud. Compared with conventional cables, these fireproof cables need special accessories and technology in connection, and it is more difficult to realize pre-branching. Their branch joints are often connected by branch boxes, except for complicated installation, construction strength, fire performance, joint performance and sealing moisture performance is also uneven.

We study the structure and material of the fireproof cable deeply, and take the flexibility, fireproof safety and construction convenience as the research direction, develop a kind of flexible fireproof cable, it has passed GB, IEC, BS and AS tests, and is a kind of truly flexible fireproof cable. On this basis, we developed the prefabricated branch type environmental protection fireproof cable. This prefabricated branch type fireproof cable has low manufacturing cost and not only retains the advantages of the traditional fireproof cable, the utility model also overcomes the problems of moisture absorption of the fire-proof layer of the general fire-proof cable and the poor flexibility of the cable, and is convenient to install and lay.

Is it better to buy ACSR Cable online or in physical stores?

I don’t know whether to buy ASTM 477 MCM ACSR Cable online or in physical stores. It mainly depends on which part of the demand you need to meet. For users with higher quality requirements, you can buy them in physical stores. After all, you can get in touch with the real thing. , Specifications, voltage, etc. to prevent errors.

Those users who are more price sensitive can order directly online; the advantage of online purchase is that the price is much cheaper than offline, because it can save the cost of site rent increase and other costs, especially the one-stop supply of ACSR Cable online. Manufacturers have special supply channels and direct sales at factory prices, which is very cost-effective.

For users who are unsure about the quality of the wire purchased online, this is actually unnecessary. We can identify the quality of the product through the sample map. Users in the same city can also directly check the production workshop; and the manufacturer has spent so much money to make the website online, it is not necessary For the sake of a single order, the previous efforts have been broken, so it is still very reliable to place an order online, provided that you must look for a more formal wire and cable website.
Yu Zheng is entangled in whether the cable is bought online or bought in a physical store. Jinhaotai suggests that you can first consult the product price online, then go to the physical store to check the quality in the same city, and then decide where to buy. After all, the advantages of online and physical stores have their own advantages.