On the specifications and standards of wires and cables

01
Plastic insulated conductor

1. Purpose: This product is suitable for fixed laying of power plant with AC rated voltage of 450 / 750V and below.
2. Product standard: GB 5023-95 AAC Cables (wires) for fixed laying of PVC insulated cables (wires) with rated voltage of 450 / 750V and below
3. Features: 1) rated voltage U0 / u is 450 / 750V and 300 / 500V. 2) Long term allowable working temperature of cable: bv-105 type… Should not exceed 105 ℃; Other models… Should not exceed 70 ℃. 3) The laying temperature of cable shall not be lower than 0 ℃; 4) The allowable bending radius of the cable is: if the outer diameter (d) of the cable is less than 25 mm, it shall not be less than 4 d; The cable outer diameter (d) of 25 mm and above shall not be less than 6D

02
Sheathed wire

1. Purpose: This product is suitable for the connection of household appliances, small electric tools, instruments and power lighting devices with AC rated voltage of 450 / 750V and below.
2. Product standard: flexible wires for connection of PVC insulated wires and cables with rated voltage of 450 / 750V and below (GB 5023, 3-85)
3. Features: 1) U0 / u is 450 / 750V, 300 / 500V and 300 / 300V. 2) Long term allowable working temperature of cable: rv-105 should not exceed 105 ℃; Other models should not exceed 70 ℃

03
Shielded flexible wire

1. Purpose: This product is suitable for electrical appliances, instruments, electronic equipment and automation devices with AC rated voltage of 300 / 300V and below.
2. Product standard: GB 5023.5-86 PVC insulated wires, cables and shielded wires with rated voltage up to and including 450 / 750V
3. Features: 1) rated voltage U0 / u is 300 / 300V; 2) Long term allowable working temperature of cable: avp-105, rvp-105… Should not exceed 105 ℃; Other models… Should not exceed 70 ℃

04
Control cable

1. Purpose: This product is used for the wiring of electrical appliances and instruments in power distribution devices with rated AC voltage of 500V or DC voltage of 1000V and below.
2. Product features: the long-term allowable working temperature of ABC Cable conductor shall not exceed 70 ℃. The temperature of wires and cables during laying shall not be lower than 0 ℃, and the bending radius during laying shall not be less than 10 times of the outer diameter of cables. The cable with armored layer or copper tape shielding structure shall not be less than 12 times of the outer diameter of the cable.
3. Product standard: gb9330.2-88 PVC insulated and sheathed control cables

05
Plastic insulated cable

1. Purpose: This product is suitable for power transmission and distribution in the line with AC 50 Hz and rated voltage 0.6/1 kV.
2. Product standard: GB 12706 · 2-91 rated voltage 35kV and below copper core, aluminum core plastic insulated power cable, PVC insulated power cable
3. Service characteristics: 1) the maximum rated temperature of cable conductor is 70 ℃. 2) The maximum temperature of cable conductor shall not exceed 160 ℃ in case of short circuit (the longest duration shall not exceed 5S). 3) When laying cables, the ambient temperature shall not be lower than 0 ℃, and the minimum bending radius shall not be less than 10 times of the outer diameter of the cable.

06
Cross linked power cable

Product standard: This product is manufactured according to the standard of GB 1270 “rated voltage 35kV and below copper core, aluminum core plastic insulated power cable”. At the same time, it can also be manufactured according to IEC, British standard, German standard and American standard recommended by International Electrotechnical Commission.
Scope of application:
This product is suitable for power distribution lines with rated power frequency voltage of 3.6/kv-26 / 35kV for distribution of electric energy.
Usage features:
The rated power frequency voltage uo / u is 3.6/6kv-26 / 35kV.
The maximum allowable long-term working temperature of cable conductor is 90 ℃.
The maximum temperature of cable conductor shall not exceed 250 ℃ in case of short circuit (the longest duration shall not exceed 5S).
The ambient temperature of cable laying shall not be lower than 0 ℃.
Bending radius of cable: not less than 15 times of outer diameter of three core cable; The single core cable shall not be less than 20 times of the outer diameter of the cable.
Selection of cable rated voltage
The rated voltage of the cable shall be suitable for the operation of the cable system, expressed in uo / u (UM) kV.
Uo — rated power frequency voltage between conductor and ground or metal shield for cable design;
U — rated power frequency voltage between conductors for cable design;
Um — the maximum value of “maximum system voltage” that the equipment can withstand.

07
Computer cable

Purpose: shielded cable for computer, high voltage polyethylene with small dielectric constant as insulation. It has the advantages of small dielectric loss, strong signal transmission ability and good anti-interference performance. It can reliably transmit weak analog signals. It can be widely used in computer systems or automation devices for detection and control in power generation, metallurgy, petroleum, chemical industry, light textile and other departments, And the general industrial computer.

08
Low smoke halogen free cable

1. Application: the product has excellent flame retardant performance, little smoke when burning, no corrosive gas escaping, and is widely used in nuclear power station, subway station, telephone exchange and computer control center, high-rise buildings, hotels, radio and television stations, important military facilities, oil platforms, etc., as well as places with concentrated personnel and low air density.
2. Usage characteristics:
1. Excellent flame retardancy and flame retardancy.
2. The amount of smoke generated during combustion is very small, and no toxic gas or corrosive gas is produced.
3. It has certain mechanical, physical and electrical properties, and can meet the requirements of the cable.
3. Product executive standard:
GB9330-88、IEC601034

09
ACSR

1、 Product standard: This product is in accordance with the International Electrotechnical Commission (IEC) pub207 “aluminum strand” and pub209 “aluminum strand steel reinforced”.

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Seemingly the same national standard cable, the difference is not just the price!

Often hear AAC Cable practitioners complain: it is too difficult to sell national standard. You say you are national standard, and those who sell non-standard also say that he is national standard. As a result, the price is more than 10% cheaper than yours, so it is helpless. Here, we will review and summarize the four rounds of the national standard and non-standard confrontation.

The first round of confrontation is calculated by the weight of copper. At first, it worked, but the national standard ignored a problem. Your copper is oxygen free rod, but not standard one. When the weight of waste copper and oxygen free rod is the same, the price of waste copper and oxygen free rod is 10%. So the national standard cable spent great efforts in propaganda, and finally failed, the difference between national standard and non-standard guarantee bottom was 10%.
The second round of confrontation, auxiliary materials on the work and materials. The state has increased resistance inspection, and also increased the inspection of conventional products. Non-standard cables began to work on auxiliary materials. If copper accounts for 70% of the cost of cables, the cost of auxiliary materials takes up about 20%, which is 20% of the cost. If the materials are used a little bit, the price is 5% different from that of national standard. We also see that many of the cables exposed recently have problems with accessories.

The third round of confrontation, the wire is short to the cable short meter. In fact, the short meter has always existed, this is the most difficult to check. It used to be common on BV, such as 95 meters, 98 meters, or 90 meters. Now, because of the increase of inspection items, all the products inspected have been included, so non-standard ones have begun to work in this direction again. I hope you can draw attention, 100 meters reduced by 1 meter, 1% of the profit came out.
The fourth round of confrontation, both sides thick and thin. That is to say, both ends of the cable are national standard, the middle part is non-standard, so it saves a lot of costs, the corresponding cable price will be much lower. You can’t cut the cable from the middle, so the leak is just drilled.
Huaxing Cable Factory has always adhered to the business philosophy of “innovation technology +, continuous improvement +”. Strictly control the product quality, select the high-quality raw material supplier as the cooperation unit, and 99.99% and above oxygen free copper is used for copper core. The products are superior to our standards, have better conductivity, lower consumption, safer and environmental protection. Is many consumers more assured choice!

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Copper price, still rising? When is the beginning?

Foreign media news: in the 2020’s, global copper demand will achieve the strongest growth in history
Copper price will rise to US $15000 / T in 2025


According to the Research Report of Huaxing factory, the 1920s will be the decade with the highest growth of global copper demand in history.
Goldman Sachs said the key role copper will play in achieving the Paris climate goals cannot be underestimated. If there is no significant progress in carbon capture and storage technology in the next few years, the realization of net zero emission will only rely on emission reduction, specifically electrification and renewable energy.
As the most cost-effective conductive material, copper is the core of acquiring, storing and transporting these new energy sources. In fact, the discussion of peaking oil demand ignores the fact that renewable energy as an alternative to oil would not have occurred without heavy use of copper and other key metals.
According to Gao Shengyan, promoting global net zero emissions remains the core driving force for the structural bull market of commodity demand, with green metals (especially copper) playing a crucial role. The physical properties of copper are very important to be able to convert these energy sources into useful end states, such as moving vehicles or heating homes.
Goldman Sachs said that based on the carbon economics analysis of electric vehicle, wind energy, solar energy and battery technology by stock analysts, we quantified this demand with a bottom-up model. It is estimated that by 2030, under the basic scenario, the green transformation will lead to an increase of nearly 600% in copper demand to 5.4 million tons,
With the active adoption of green technology, the transformation will lead to a 900% increase in copper demand to 8.7 million tons. Analysts at Goldman Sachs estimate that by the middle of this century, the growth of green demand alone will reach (and soon surpass) the increase in demand brought about by China in the 2000s. Coupled with the ripple effect on non green industries, it means that the 2020’s is expected to become the strongest growth stage in the history of global copper demand.

However, the copper market is not ready for this demand environment.
In addition, poor returns over the past decade, coupled with concerns about environmental and social governance (ESG), have led to a reduction in investment in future supply growth in the copper industry, which has brought the copper market very close to the peak supply. In fact, the copper market is reproducing the classic case of “Revenge of the old economy”, just like the situation of the crude oil market during the commodity boom of the 2000s.
Analysts at Goldman Sachs say that the collapse in prices in the mid-2010’s has led to deep trouble for manufacturers that have increased production prematurely, leading the mining industry to remain cautious about production growth. Although copper prices have risen 80% in the past 12 months, no substantial green space projects have been approved.
COVID-19 makes this supply and demand dynamic more complex and brings more uncertainty, which leads enterprises to freeze investment decisions.
Due to the surge of demand, but the lag of supply growth, the current gap between supply and demand expands, and indicates that there will be a large-scale gap between supply and demand from 2025. Analysts at Goldman Sachs now estimate that the long-term supply gap will reach 8.2 million tons by 2030, which is twice the supply and demand gap that triggered the bull market in the early 21st century.
Goldman Sachs expects the price of copper to rise all the way to $15000 a ton. Analysts at Goldman Sachs believe that from now on, the most likely trend for copper prices is to rise to about $15000 around 2025.
Goldman Sachs now forecasts that the average price of copper will be $9675 / T in 2021, $11875 / T in 2022, $12000 / T in 2023, $14000 / T in 2024 and $15000 / T in 2025. In this context, we have upgraded our 12-month copper price target to US $11000 per ton.

Characteristics and optimization of electric vehicle high voltage cable

The perfect and complex design and use of high-quality materials will result in expensive acsr cable costs. Experience shows that, for specific high voltage cables, it can be tailored by optimizing the cross section, temperature requirements, flexibility and shielding effect. Weight and cost savings can be highlighted, and over sized and over sized components can be avoided.
1. optimization of sectional area and temperature grade
The selection of cables is mostly based on the ambient temperature and the transmission current index. In this regard, the most important features are “cable section” and “heat resistance grade of materials used for cables”.
The voltage drop of the conductor is converted into the conductor of the high voltage cable heated by heat energy. This heat can be partially transferred to the environment, which reduces the operating temperature of the conductor. Lower temperature gradients can transfer less heat. Cables with continuous load current can cause the highest rated temperature to be borne. This temperature can cause the aging of the materials used.


The challenge for cable designers is to design the most suitable cable for application: excessive conductor specifications can lead to increased cost and weight, and larger outer diameter. In the worst case, only considering the highest possible load current and ambient temperature will result in the use of large section cables, high temperature resistant materials such as organic fluorine or silicon.
It is very meaningful to determine the relationship between current and load environment temperature from the technical and economic point of view. The real driver periodic dynamic current peak should be considered, allowing for a reasonable definition of the load current and peak current in the worst case.
A good design prerequisite is an understanding of the basic conditions, such as the need to determine the ambient temperature and cable load first.
Generally, the high-voltage cable manufacturer with large cross-section has a large inertia in terms of temperature change, so the peak current of acceleration or deceleration of vehicles will not cause the influence of a large conductor temperature.
The ability of high voltage cables to handle these peaks is usually defined by thermal overload performance, even if the short-term temperature peaks are allowed to exceed the cable temperature level defined above. Therefore, the cable does not need to be designed as a higher working temperature level, and it is unnecessary to use cables that exceed the specified working temperature.
The permanent load current and single pulse or series pulse can be considered comprehensively, together with various parameters, such as ambient temperature.
The combination of theoretical basis and practical experience can preliminarily determine, select and optimize the high voltage cable which meets the application.


2. flexibility optimization
The available space for the cable routing of the vehicle should be considered carefully. The bending radius of the vehicle in a specific area will lead to the improvement of the flexibility requirements of the whole cable. If small changes may be made in the overall design, it is very meaningful to avoid the problem of tight bending.
Cables do not have to be of the highest flexibility. The exact definition of bending force, combined with the structure and corresponding test equipment, enables the designer of the cable to create the most suitable application design. Especially for larger section cables, it is significant to reduce the cost by replacing the high flexibility design with flexible or conventional structural design.
3. optimization of shielding effect
The shielding effect defined in a certain frequency range is very necessary for the development of cables. Shielding effects without frequency information are not useful, which may lead to excessive size and expensive combination shielding for the solution, which is no longer necessary from a technical point of view.
Generally, the electric vehicle cable development and design stage can be considered by theoretical calculation. Then the shielding effect of high voltage cable is verified by means of test.
Concluding remarks
The high voltage harness of electric vehicle and traditional wiring system still have a long way to go. Specific specification requirements are usually not clearly defined, which can lead to technical complexity, and thus lead to expensive solutions.
All parties involved in the development stage must adopt system oriented method to optimize the technology and cost of high voltage cable reasonably.


These parties may include cable, connector and component suppliers, harness plants, and host plants.
The knowledge accumulation of the whole system and the specification of a high voltage cable which is oriented to the target requirements are the basis of the optimization design.
The R & D Department of cable manufacturing uses theoretical calculation and appropriate measuring equipment to verify that it is capable of developing more suitable cables for application.

Matters needing attention in power cable installation

1. Keep a distance of 2m when the mine AAAC cable is installed in parallel with the thermal pipeline, and keep 0.5m when crossing.
2. When the cable is installed in parallel or across other pipes, a distance of 0.5m must be maintained.
3. When the cable is directly buried, the depth of the 1-35kV cable shall not be less than 0.7m.
4. When the cables of 10kV and below are installed in parallel, the mutual clear distance shall not be less than 0.1m, 10-35kV shall not be less than 0.25m, and the cross distance shall not be less than 0.5m.
5. The minimum bending radius of the cable must not be less than 15D for multi-core cables and 20D for single-core cables (D is the outer diameter of the cable).


6. Cable joints of 6kv and above.
A. When installing the cable terminal head, the semi-conductive shielding layer must be stripped off, and the insulation must not be damaged during operation. Knife marks and unevenness should be avoided, and sandpaper should be used if necessary. The shielding end should be flat and graphite The layer (carbon particles) is removed.
B. The copper shield and steel armor of the plastic insulated cable end must be well grounded. This principle should also be followed for short circuits to avoid induced electromotive force at the steel armor end during unbalanced operation of three-phase, or even “fire” and burn the sheath. Wait for the accident. The grounding lead wire should be tinned braided copper wire, and soldering iron should be used when connecting with the copper tape of the cable. It is not suitable to use a blowtorch to seal and solder, so as not to burn the insulation.
C. The three-phase copper shield should be connected to the ground wire separately. Note that the shield ground wire and the steel armor ground wire should be led out separately and insulated from each other. The position of the welding ground wire should be as low as possible.


7. The basic requirements for cable ends and intermediate joints: a. Good conductor connection; b. Reliable insulation, it is recommended to use radiation cross-linked heat-shrinkable silicone rubber insulating materials; c. Good sealing; d. Sufficient mechanical strength, Can adapt to various operating conditions.
8. The cable end must be waterproof and corroded by other corrosive materials to prevent breakdown due to aging of the insulation layer caused by water trees.
9. Cable loading and unloading must use cranes or forklifts. Horizontal transportation or laying flat is prohibited. When installing large cables, cable cars must be used to prevent cables from being damaged by external forces or scratching the insulation layer due to manual dragging.
10. If the cable cannot be laid in time for some reason, it should be stored in a dry place to prevent sun exposure and water ingress into the cable end.

What are the requirements for environmental protection cables

As the second largest manufacturing industry in China after automobile manufacturing, the wire and cable industry should also play a leading role in environmental protection. In recent years, environmentally friendly cables have become more and more popular in the market. In developed countries such as the European Union, non-environmental protection has been banned. Cables, China also attaches great importance to this aspect. China’s relevant laws and regulations explicitly require important buildings to prohibit the use of polyvinyl chloride wires and cables. Halogen-free and low-smoke cross-linked PVC wires and cables must be used to avoid a large amount of smoke and chlorine in the event of a fire. Casualties.
Environmental protection cables are the main direction of the future development of the cable industry, which can effectively enhance the competitiveness of cable companies. Because of the many excellent characteristics of environmental protection cables, they are also favored by more and more customers in the market.


Compared with ordinary cables, environmental protection cables have many excellent characteristics, such as no heavy metals, no halogens, no corrosive gas, no soil pollution, etc. If summed up, the requirements of environmental protection cables can be roughly divided into three aspects.
The first is that it does not contain heavy metals. Common PVC cables often contain heavy metals such as lead, cadmium and barium, which are harmful to the human body. Later, some countries stipulated that the content of eight types of heavy metals should not be higher than the specified value, and one of the main advantages of environmentally friendly cables It does not contain heavy metals, which is also its popular selling point in the market.
The second requirement of environmentally friendly cables is low-smoke and halogen-free. When ordinary cables are burnt, they will release a large amount of smoke and toxic gases, which will seriously pollute the air environment and cause harm to the human body. The low-smoke and halogen-free characteristics of environmentally friendly cables can not only protect the environment, but also It can help people evacuate and carry out fire rescue work when a fire occurs.


Secondly, it must be non-toxic. All component materials used in PVC formulations should be non-toxic. Cable material contains a lot of plasticizers, but non-toxic plasticizers must be used to make non-toxic materials. Therefore, this PVC material has higher requirements than lead-free and heavy metal-free materials, and the price is naturally more expensive.
Many countries have different requirements for environmental protection cables. For example, the European Union will restrict environmental protection cables containing asbestos. my country has not been as perfect as the EU in terms of related policy formulation and mandatory application. In this regard, China still has a long way to go. The way to go.

Factors restricting the development of the cable industry

The cable industry has developed to now, and the overall size is very large, with a large number of companies. China has surpassed the United States to become the world’s largest cable manufacturer. However, in this rapid development process, many problems have gradually been exposed.
The first problem is that there are few large domestic cable companies, and they lack competitiveness with foreign cable companies in high-end products. Even in 2018 or so, the annual output value of the top ten companies in  ACSR cable production scale is not as good as the total output value of the industry. 20% of the total, which is in sharp contrast with developed countries. However, it is roughly the same as my country’s current economic structure, and it is basically the same as that of other industries.


The second problem is that the homogeneity of products is serious and the market competition is fierce. There are a large number of cable companies in China, most of which are small and medium-sized enterprises. The operation mode, management and technical level of these companies present serious homogeneity problems. The problem of homogenization has aggravated overcapacity. In a homogeneous product market, users are mainly concerned with price, and competition is almost entirely concentrated on price. The greater the surplus of homogenized production capacity, the fiercer the price competition, the thinner the profit, and the more difficult it is for a company to survive.


The third problem is that the pressure of funds is huge. The xlpe cable industry is a typical heavy-material and light-industry industry and a capital-intensive industry. Therefore, the cable industry is always facing the pressure of the capital chain. The most significant phenomenon is the application of many companies. The total amount of money collected accounts for a high percentage of annual revenue, many of which are 30%. This also leads to financial difficulties for companies, and China’s cable industry is mostly small and medium-sized enterprises, so these companies are generally facing financial pressures. The problems of difficult financing, expensive financing, and high financing costs have sharply increased the risks in the capital chain of enterprises. In the past two years, due to the tightening of the entire financial system, many companies have found it difficult to cope and shut down and revert.

Talking about the definition and function of weak current wires

1. Definition of weak current wires
Weak current cables refer to cables used for security communications, electrical equipment and related weak current transmission. There is no strict boundary between “wire” and “cable”. Generally, products with a small number of cores, small product diameters, and simple structures are called wires, those without insulation are called bare wires, and the others are called cables; those with a larger conductor cross-sectional area (greater than 6 square millimeters) are called large wires. Small (less than or equal to 6 square millimeters) are called small wires, andXLPE insulated cables are also called cloth wires.
RVS fire wire
2. The role of weak current wires
The main processing object of weak wires is information, that is, the transmission and control of information, which is characterized by low voltage, low current, low power, and high frequency. The main consideration is the effect of information transmission, such as the fidelity, speed, breadth and reliability of information transmission, that is, the line that realizes the transmission of weak electrical signals.


RVVP shielded wire
3. Types of weak current wires
1. Telephone line, large logarithmic HYA: wire specifications are 2*1, 2*0.5, 4*1, 4*0.5, large logarithmic HYA has 10 pairs, 20 pairs, 30 pairs, 50 pairs, 100 pairs And so on, are all in pairs.
2. Video cable SYV series and SYWV series: SYV is a video cable for monitoring, such as video cable SYV75-5; SYWV is a cable TV cable, which belongs to physical foaming; there is also an elevator frequency cable SYXV.
3. Power cord RVV series: mainly used for weak current power supply, sometimes also used for control, such as RVV2*1.0.
4. RVS, RVB, RVVB series, including common type, fire-resistant type, and flame-retardant type. RVS is generally used in fire fighting systems.
5. Network cable: UTP is unshielded, FTP is shielded, such as: Category 5 unshielded network cable UTPCAT.5e, Category 6 shielded network cable is FTPCAT.6e.
6. Shielded wire RVVP series: The appearance is similar to the RVV power cord, except that there is an extra layer of shielding net in the structure, and a letter P is added to the model. Generally, wires with P have a shielding layer.

Why should the length of power cable be reserved?

It is very difficult to repair and replace600V 90°C XLPE ACWU90 AC90 Cable, especially when the middle section is in trouble, because the cable is laid in the open, the bridge, the buried, the cable trench and the pipe. So in the cable laying is required to reserve. Not only in the cable trench in the feeder, but also to reserve the end; if it is tube or cable trench laying, in the middle of the maintenance wells to reserve a certain length.

Advantages: When the power cable is connected to the feeder circuit or equipment, the copper nose needs to be pressed and the outer protective layer of the cable needs to be removed And the distribution cabinet, control cabinet itself is also relatively easy to affect the cable, so the cable in both ends need to reserve a certain length to deal with the subsequent maintenance.

Otherwise, it will be difficult to deal with the problem in the figure below. The advantage of the reserved maintenance well: When the power cable is laid secretly, a maintenance well must be set up at a certain distance, which is mainly used to deal with the inspection and repair of the fault in the middle part ofPVC XLPE Insulated Power Cable 25mm² ~ 400mm². If a section is damaged by external forces or problems, the amount reserved in the manhole can be used nearby, making maintenance convenient and time-saving. Otherwise, it is very difficult to deal with the following problem.

Other benefits: due to the general cable laying path is generally more complex, often need to turn bend, calculation of cable length can not be accurate, appropriate length can also be reserved for laying a variety of special circumstances.

Cable maintenance tips

Everyone knows that everything will deteriorate after being used for a long time, and the same goes for wires. WhenAerial Bundled Cable (ABC) HD 626 S1 Standard is aging for household or commercial use, it is easy to cause danger if it continues to be used, and timely inspection can eliminate potential safety hazards. But how to detect wire aging in time requires some tricks.
The wire is mainly insulated by the outer layer of sheath. After a long time, it will be corroded by corrosive gas, and the insulation performance will gradually decrease. It will gradually age and become hard, become brittle or fall off, and then it will not be insulated. In fact, the direct cause of the aging failure of the wire and cable is the breakdown of the insulation due to the degradation.
1. “Check the appearance along the wire, darkening and hard cracks are seen. Bending the wire with both hands for insulation, stiff and cracked skin.” It means to observe the insulation layer along the wire. If the color of the insulation layer is found to be tarnished, darkened, or changed Hard, cracked, and partially peeled off.


When the insulated conductor is bent with both hands, the wire is stiff, even the insulation layer is cracked, the insulation layer falls off, etc., which shows that the wire has experienced different degrees of aging and severe aging.
2. “Accurate method to measure insulation, megohm is not low. The humidity value in rainy days can be small, and the value can be less than half.” It means that the insulation resistance meter can be used to measure the insulation of electrical circuits to determine the insulation status of the circuit more accurately.


3. If the wires cannot be replaced in time, you can also choose to use good internal materials to reduce hidden dangers. Once the insulation of the sheath of the wire casing is damaged, the possibility of fire will increase. The length of time for causing a disaster has a lot to do with the quality of the oxygen barrier. The newly produced diamond mud ceramic silica gel with silicone rubber as the base material by Shanghai Tengruina Chemical Technology Co., Ltd. has good high temperature resistance, fire resistance and fire resistance. The effective prevention and control of fire sources is to prevent fires to a certain extent. avoid lost. If there is a fire around the line, the shell of diamond mud ceramic silicon rubber can also ensure that it will not melt or drip in the flame, which effectively protects the normal use of the line and avoids explosions.
Finally, the editor still has a small reminder: the wire is aging, and the wire needs to be replaced in time. Don’t have a fluke mentality. The diamond mud oxygen barrier can only reduce the possibility of fire. Once a fire occurs, it will affect manpower, material resources and financial resources. The losses should not be underestimated!