Pay attention to the suitability of choosing ppe

A simple, bright and spacious desktop will improve the mood and efficiency of daily use. I have a very deep feeling in my work and leisure. Do you think too metaphysical? Attach the previous desktop:

The desktops created due to historical problems have caused the operability to be too small. They have even learned words, read books, copied notes, and have no space for writing and writing love letters. They also feel particularly crowded visually, and they are particularly boring when used. a feeling of. This is not conducive to physical health, but also is not conducive to mental health, but also not conducive to the formation of a harmonious and beautiful socialist society. In order to further promote the spaciousness and operability of the table and improve the user's mood and operating experience, it is necessary to give full play to the subjective initiative, improve the awareness of reform, and do a good job in the related tasks of finishing, and do a good job of preventing the excessive consumption of hands. The division of responsibilities has enabled this work to be implemented quickly and steadily, and to form a ledger and desktop story in a timely manner before July 4. In accordance with the requirements of a higher-than-average purchase, this special desktop story is reported as follows:

preview:

Experience: It is known as the “small refrigerator” that is bought after it is bought. The odd type of the chassis, the volume is often gray, the motherboard is horizontal, supports all kinds of motherboards, and supports multiple combination stacks. The internal space can be used as Small compartment or hand-held display box, I put more hard drives are placed inside. Of course, if the brain hole is large enough, the sockets and routers can be put in, and you can really upgrade the chassis for many years. However, one of the disadvantages is that it is not dustproof. Both the main panel and the side panels of the chassis are designed with heat dissipating holes and it is easy to enter the dust. The second is too big. It really takes up space and is too crowded. Because I can't fit my desk under the desk, I'll put it on the side table, HDIM cable, DP cable, USB extension cable and so on. The next plan is to open windows on the acrylic side panels of the chassis.

Experience: After watching everyone's evaluation, began to play 27UD68W and 27UD58B, and later began to tangled 27-inch and 32-inch. As a result, Zhang Damu pushed 2,241 yuan on June 7 and did not hold back his direct hand. 618 offer 2180 yuan, feeling lost a few hundred million. Everyone said that the border can be a horse race and I can accept it myself. The other person said that the brightness is low, and I can feel it. According to the recommended parameters of the foreign forums, the color of the screen was adjusted, and my “astigmatism” feeling did not make any difference. After watching it on the resolution, watching the 1080P monitor has a foggy feeling. One of the disadvantages is that the 27-inch 4K really has a feeling of blinking, too large resolution font is too small. I use win7, DPI zoom 200% and feel uncoordinated; the second disadvantage is 4K film resources less, large size, and under 4K beauty face powder, pores, eyeliner is too clear, but there is a kind of "negative" Effect; Disadvantages The third is to play games, 4K games too eat hardware, and my 970 a lot of games need to lower the picture quality, and you need to add money to 4 Titan nuclear bombs (PS: 1080ti basically meet most of the game). The fourth disadvantage is that for high-resolution games such as I played P clubs, such as "Four Europe", "Failure 2", "Moustache Forming Plan 3" and "Various Stars" and other strategy games. The interface is too small, which seriously affects the decision-making power and judgment. In the end, it will lose the war and be sealed as the earl of Glamorgan by the Emperor Luo.

Use experience: In one sentence, “a good-looking, warm-hearted, warm-hearted, good-looking, hot-cold rider” is used. When you play a computer, you can pour a cup. After you finish drinking, you can rest and rest your eyes, leave the computer desk, and then go back and get a cup back.啥 Disadvantages.

Use experience: Really small investment returns, why not do it. Taking advantage of 618, a large book of East Books, bought 40 books, and I can feel it for a long time. There are too many benefits. The downside is that if you buy it, you don't see it wasting money. It is a Sin. Just after reading "History of ***ual Judgment", I feel hurt by 10,000 points. By the way, for a long time, "The Holy Roman Empire: A Thousand Years of Europe's History" Amazon made a second-hand use, immediately broke his hand and felt happy to explode. This is the second motivation for me to write this review. What is the first motivation? Of course, gold coins.

Yes, there is this to recommend:

Use experience: IKEA's "can be insignificant" pen holder, modern design, concise and generous, have a look at the power of calligraphy.

Finally, as a staff member of the office unit, I did not say anything. I have to write materials overtime. I wish everyone that the delivery of 618 hands will now be completed. I wish you all a pair of eleven long newcomers again.

Plug In Series​  Diode

In the rectifier circuit; the use of diodes in series can increase the back pressure withstand value (usually the sum of the back pressure of all diodes, but it is best to use diodes of the same specification).

In the voltage stabilization circuit; the series connection of the diode is equal to the sum of the voltage stabilization value of the diode. The use of diodes in parallel is theoretically the sum of rated currents, but considering that it is impossible to be absolutely symmetrical, they can only be used below 80% of the total.

TVS transient suppressor diodes work in the same way as regulator diodes, but there are structural differences.The biggest difference is that the PN junction area composed of the general regulator diode is very small, it can withstand the reverse current is small.

Transient Voltage Suppressor,Transient Voltage Suppressor Diode,Series diode

Changzhou Changyuan Electronic Co., Ltd. , https://www.cydiode.com

There are many problems in the installation and operation management of distribution and arrester arresters. Occasionally, users accidentally burn transformers and arrest lightning arresters. For a long time, arresters are installed on the upper side of distribution transformers. According to the operation comparison, this installation method is not reasonable.

1. Arrester installation 1. Existing problems and handling Arrester is generally installed on the upper side of the high-voltage fuse. According to the regulations, “The height of the changing platform from the ground shall not be less than 2.5m.” This will cause damage to the arrester or cause grounding, short circuit, and checkout. At the time, the entire 10kV line needs to be powered off and it is not conducive to loading and unloading. In addition, the grounding lead of the arrester is too long from the ground and does not meet the relevant technical requirements. In view of the above problems, we have changed the mounting position of the distribution lightning arrester and installed it on the lower side of the high-voltage fuse. This will not affect the protection effect and scope of the arrester, but also help the normal assembly and disassembly of the arrester, reducing the number of power outages of the entire line. At the same time, when the performance of the arrester is reduced by lightning, the freewheeling current will inevitably cause the failure of the arrester itself, and the fuse will fuse, which will isolate the fault point, reduce the chance of single-phase or short-circuit tripping of the line, and increase the power supply. Reliability rate.

2. Installation Precautions The mounting point of the arrester should be more than 0.7m away from the fuse to ensure that the safety distance specified in the “Safety Practice for Electric Industry” is met during maintenance. The lead length of the arrester should be as short as possible and reliable. The wire should use 35-50mm2 black wire to reduce the lead reactance and reduce the residual voltage. The distance between the arrester and the transformer should be more than 2m, increase the inductance on the wire, and increase the relative lightning resistance level of the transformer. When the lightning arrester is removed and reinstalled, it must not be tied with wire or wire, but should be re-used with special fixtures to prevent creepage. In addition, the down conductor of the lightning arrester must be properly connected and tied on the cross arm and the pole to prevent accidents caused by grounding, short circuit or damage to the transformer when the arrester is exploded.

II. Problems in the Operation of Arrester

2.1 As the damage, breakdown, corrosion is not easy to install, the source of funds and the غير مجاز مي باشدt burden is difficult, and the village electrician's sense of responsibility is not strong, there are factors such as Pang Hing psychological, can not be installed, supplemented, and objectively lead to low installation rate and installation of arresters Not enough.

2.2 Due to the large workload of regular arrester arresters, a considerable number of arresters have not been calibrated for many years, and the formation of a malfunctioning arrester is still operating on the Internet.

2.3 As the responsibility of the construction, installation, and maintenance personnel is not strong, most of the arresters during operation have looseness, tilt, and misplacement of the mounting position, leads off, and other abnormal conditions.

2.4 Arrester products are of low quality and cannot effectively protect them.

2.5 The ground lead strand breaks the strand and winds, and some even use the wire instead of the ground lead wire, and most of them have the problem of large grounding resistance.

Third, how to rectify

3.1 Increase publicity and education to allow users to understand the necessity and importance of installing surge arresters.

3.2 The electrician should master the arrester installation process, regulate the construction, and leave no sequelae.

3.3 Strengthen the operation and management work, conduct inspections, inspections, and calibrations on a regular basis, and unqualified arresters cannot be operated on the Internet.

3.4 Actively promote the use of zinc oxide surge arresters.

3.5 Make a thorough inspection of the arrester grounding body and the transformer grounding body of all the distribution transformers in the area, and thoroughly handle the grounding resistance.

Adjustable Control Arm

Suspension system is an important part of modern automobile, which has great influence on the ride comfort and handling stability of automobile.

As the guiding and force transmitting component of automobile suspension system, the control arm transfers various forces acting on the wheels to the vehicle body, and ensures that the wheels move according to a certain trajectory. The vehicle control arm connects the wheel and the vehicle body elastically through the ball hinge or bushing respectively. The automobile control arm (including the Bush and ball joint connected with it) should have enough rigidity, strength and service life.

Adjustable Control Arms,Adjustable Control Arm Kit,Adjustable Control Arm Replacement,Jeep Adjustable Control Arm

غير مجاز مي باشدa Trading (Zhoushan) Co., Ltd. , https://www.غير مجاز مي باشدatd.com

Just as you annoyed why there is no one made for a woman's lingerie , the appearance of 37 ° love underwear by no means accidental, her underwear design from the fabric selection, shape modeling, color mix, style Established, designers are looking for the most perfect entry point underwear design. To meet the comfort of women wearing underwear, functional requirements, to create intimate fashion.

Underwear as a woman's second layer of skin, a variety of fashion charm, ***y sultry underwear has become the most intimate modern woman's lover. Apparel designers boldly play the whimsy, the most close to the woman's skin to create a fine and unique objects, so that women readjust their perspectives, to find and examine their hidden beauty.

Underwear Waichuan is an avant-garde Dress style, underwear features designed for the dressing style, it comes from the inspiration of designers inspiration. 37 degrees love the chief designer YE will be the elements of the popular season and underwear the perfect combination of special materials, leading us to experience a different kind of style.

Cestbella Special Gifts

Fashion,Sunglasses,Rose Pattern,Exquisite Watch

Wedding Dress,Wedding Accessories Co., Ltd. , http://www.nbjd.net

Most mothers during pregnancy, due to body size changes, and can not use the constraints of غير مجاز مي باشدmetics and other conditions, easy to lose confidence in themselves, always feel ugly ugly, it is difficult to glamorous.

Is it necessary to be pregnant and fashion insulated? Is the past beautiful and beautiful must have a full stop in pregnancy?

In this regard, Hui Bao 's design director James that "pregnant woman is the world's most beautiful woman," and Whirlibab for 16 years has also been "the best for the world's pregnant women with the most beautiful clothes," and work hard for the Moms bring intimate fashion lifestyle.

Modern healthy living from the inside

Many mothers during pregnancy will have a variety of emotional problems, to this end, Hui Bao held in many places throughout the "Huibao pregnant mother Lecture Hall," the public welfare activities, invited experts to explain to their mothers during pregnancy health knowledge and various Precautions to help them safely through pregnancy. For many years, Whirlpool has been acting to care for these great mothers. In addition, the love of mothers Hui Bao is also reflected in the clothing.

Many people think that as long as buying more than usual freshman, two sizes of clothes enough to deal with the entire pregnancy process, in fact, the professional maternity dress should be more relaxed and comfortable, more conducive to perspiration, which the choice of fabric Made a very high demand. In this regard, James introduced us: "At present, we Hui Bao began to try to use some new environmentally friendly fabrics, from the mother for the environment to create a healthy and healthy atmosphere, such as bamboo fiber fabric, this eco-friendly fabric with absorbent, Breathable, antibacterial and other functions, but does not stimulate the skin, can be said that from the clothing 'intrinsic' to give mom care intimate. 'Fashion, health, environmental protection is advocated by Hui Bao's modern way of life, this way of life should also be From the inside out, the application of eco-friendly eco fabric can be said to be a big step forward for Huibao innovation.

Traditional concept of breaking maternity wear

From 2009 onwards, Hui Bao took the lead in breaking the traditional maternity dress with black, white, gray, coffee and other conventional colors, the use of colorful eye-catching colors, when mothers dressed in Hui Bao clothing, the whole person seems to be a new look, full young and energetic. And since then, the market has launched a similar maternity dress, it can be said that Huibao laid the fashion pioneer status. Recently, Hui Bao has made a pioneering fashion maternity dress industry. "In the past we thought that maternity clothes were worn during pregnancy and would not be worn after pregnancy. In this case, the service life of the clothes is only a few months. We decided Extending the 'life' of maternity dresses, after a series of R & D efforts, we created versatile Maternity Fashions in spring / summer 2012. It is not only for pregnancy but also for non-pregnancy. "Turning to this, James is proud of" Modern women pay great attention to healthy diet and daily exercise. Therefore, in general, only the changes in the three parts of the chest, abdomen and leg during pregnancy are most obvious, and other parts rarely have serious deformation. Therefore, we pay special attention to the design The three parts of the version, so as to achieve the maternity dress, even if not the case of the belt, but also has the same fashion and general fashion effect.

In general, women are already struggling to pick the right outfit, and getting pregnant and picking up the right outfit becomes a tougher job as the baby grows. Sixteen years, Hui Bao has been focused on the fashion maternity dress, caring for the health of mothers, the introduction of maternity dress is no less than today's trendy fashion, so that mothers even in the "fat" ten-month pregnancy, you can Enjoy blooming fashion charm.

USB Charger

Portable high efficient travel charger, can charge multi devices at the same time, every port output mini 5v 1a, max 5v 2.1a. We can meet your specific requirement of the products, like label design. The plug type is US/UK/AU/EU. The material of this product is PC+ABS. All condition of our product is 100% brand new.  

Our products built with input/output overvoltage protection, input/output overcurrent protection, over temperature protection, over power protection and short circuit protection. You can send more details of this product, so that we can offer best service to you! 

Usb Charger,Universal Travel Adapter,Intelligent Usb Charger,Travel Adapter

Shenzhen Waweis Technology Co., Ltd. , https://www.waweis.com

Home-use ones and commercial LCD splicing walls are unclear to many people. From the point of view, they can meet desktop, wall-mounted, ceiling-mounted, horizontal, and vertical installations, and can be different for various occasions. Demand and design, they are all used to play dynamic pictures, but also can be operated by remote control, it looks like twins, but they are actually very different, there are great differences in the categories of consumer groups.

Others Specificial wadding/padding

AOBO New Material, Dust Collector Co., Ltd.  , http://www.nbfilterm.com

First, check the electrification of the conductor

Let the metal ball of the electroscope that has been positively charged be close to the conductor of the high-voltage electroscope to be inspected. If the angle of the gold leaf of the electroscope becomes larger, it means that the conductor under inspection is positively charged due to the repulsion of the same-level charge. The electric charge on the metal cone of the electroscope is transferred to the gold foil to increase the opening angle. If the angle of the gold foil of the electroscope decreases, it means that the conductor under inspection is negatively charged or not. This is due to the attraction of the opposite-phase charge, which causes the positive charge on the gold foil to shift toward the metal sphere and make the angle of divergence smaller. In this case, The inspected conductor can be placed close to the metal ball of the electroscope that is known to be negatively charged. If the angle of the gold foil becomes large, it can be confirmed that the conductor under inspection must be negatively charged.

Second, compare the potential of different conductors
Connect the metal ball of the same uncharged electroscope with the positively charged conductors A and B, and observe the size of the angle of the gold leaf. When the angle is large, the potential of the connected conductor is high. If both conductors are negatively charged, the potential of the connected conductor is low when the opening angle is large. This is because the amount of charge transferred from an electrified body to the electroscope is not determined by the amount of charge carried by the charged body, but rather by the potential difference between the charged body and the electroscope when it is not connected. At the beginning, the electroscope is not charged. We can specify its potential to be zero. Although the metal balls and metal rods of the electroscope are isolated conductors, they also have certain capacitance. When the live body is connected to the metal ball with a wire, the charge of the live body flows to the electroscope so that the potential of the electroscope gradually increases, and does not mean that the amount of charged electric charge is large. Therefore, we can not compare the amount of charge carried by different charged bodies according to the size of the gold foil opening angle. At most, we can compare the charge of the same charged body at which time.

Third, check whether the conductor is charged

The conductor to be inspected is directly contacted with the metal ball of the electroscope or connected with the wire to observe whether the gold foil of the electroscope is opened or not, and it can be determined whether the conductor is electrified. It is also possible to place the conductor under inspection not in contact with the electroscope and only near its metal ball. If the conductor is charged, due to the electrostatic induction, different types of charges are induced on the metal ball and the gold foil of the electroscope to open the gold foil.

Dear customers, Shijiazhuang Chengkai Power Equipment Co., Ltd. has power security tool cabinets, grounding lines, electroscopes and other products. You can call the company's service hotline to learn more detailed product information. The perfect service is us. Never-ending pursuit, welcome new and old customers to buy their own favorite products, we will be happy to serve you!

Different Style Display Rack

Wooden Jewelry Display Rack,Neck Jewelry Display Rack,Jewelry Display Rack

Hardware Tools Display Rack Co., Ltd. , http://www.sofine-displays.com

                    Steel metal deck making machine by roll forming
Metal deck forming machine is aided and optimized by computer. The metal deck produced by this machine has high strength with big wavelength. Used on high buildings , it not only saves steel mold plate, but also reduces the weight of storey. With the same bearing capacity, it economizes steel and cuts down investment accordingly.

chisel

Water Well Drilling Rig Co., Ltd. , http://www.nbdrillrig.com

Farman children , the English name Farmanl, as the gorgeous French perfume, giving a romantic, elegant, mysterious and fascinating reverie. A piece of underwear , one night style, every piece of Farmanl (Farman children), are elegant and time-honored heritage. You can never predict how the flirtatious power of Farmanl brings you beyond imagination.

Farmanl created for you not only the seductive ***y and charming, more confident and elegant and comfortable. Just as the French woman, romantic, sophisticated, elegant, ubiquitous highlight the dazzling intellectual fashion beauty. Elegance is a living attitude, is the depth of bone marrow aesthetic, but also carefully dressed but inadvertently revealed. Flowing fleeting, grace is difficult to return, intellectual superior woman will always know how to love yourself.

Brewery Water Chiller

Brewery Water Chiller 

1.With world famous brand, COPELAND/DANFOSS brand scroll compressor, BITZER brand screw compressor, SCHNEIDER electric parts, EMERSON/DANFOSS refrigerant valves. PLC controller. 

2.We AMRTA Industrial chiller typically make economic sense for brewery, beverage etc. 

3.Our brewery chiller with a sanitary heat exchanger as a loop in loop system to maximize efficiency and control over the wort cooling process. 

4.Brewery chiller require lower temperatures and more accurate temperature controls than a standard comfort cooling chiller. We AMRTA provide a variety of low temperature options including the ability to run in ambient temperatures down to -40°F. 

5.Brewery chiller have a number of available capacity controls protecting you from short cycling.  

Brewery Water Chiller,Low Temperature Brewery Water Chiller,Brewery Glycol Water Chiller,Brewery Portable Water Chillers

Jinan Amrta Air Conditioning Co.,Ltd , https://www.waterchiller.pl

The English initials of coded orthogonal frequency division multiplexing are abbreviated as COFDM, and the modulation technology with outstanding and great development potential is used. Its value is to support the use of breakthrough line-of-sight restrictions. Its basic principle is to transfer high-speed data streams through string transformations and allocate them to several sub-channels with lower transmission rates for transmission. The COFDM technology also belongs to the multi-carrier modulation technology. The data transmission uses time division and frequency division methods and works on respective word carriers. Each sub-carrier is on a specific orthogonal frequency to increase the potential data throughput. Modulation technology can transmit high-definition video images stably in a complex environment, and can transmit up to 150 kilometers at the longest distance. Tengyuan Ctop high-definition wireless wireless image transmission equipment is exported to advanced countries in Europe and America, and there may be questions about what Xiaobian said. The picture transmission device is what it looks like, and what kind of features, the following describes several different types of COFDM mobile wireless video transmission equipment, easy to understand.

one. Vehicle-borne standard definition wireless image transmission system ST6240CZ vehicle-mounted wireless image real-time transmission system is a broadcast-grade high-definition image real-time transmission system. It adopts the current outstanding COFDM modulation technology, and has COFDM anti-electromagnetic interference performance, anti-multipath fading performance, combined with foreign Advanced diversity reception technology overcomes the problems caused by multi-path reflection and blocking of image transmission under analog technology and conventional modulation technology, enabling high-speed image capture and real-time non-line-of-sight transmission of high-quality images. Audio and video encoding uses MPEG-2 Standard, resolution to DVD resolution (720*576@PAL/720*480@NTSC), with clear picture quality, bright colors, smooth images. Suitable for use in a complex environment, this device has a large power transmission distance and can transmit 70 kilometers under the line of sight.

Driving & Driven Cylindrical Gear

      Gear mechanism is used to transfer motion and power between two shafts,and is the most widely used transmission mechanism,It is through the meshing of gear teeth to achieve the transmission requirements,so compared with the friction wheel,pulley and other mechanical transmission,its remarkable characteristics are:stable transmission ratio,reliable work,high effciency,long life,suitable for a wide range of diameter,circumference speed and power.

    Cylindrical gear is an important gear type in mechanical gear,but also the most common gear style.

    Cylindrical gears accroding to the direction of the teeth,can be divided intospur cylindrical gears,helical

    Cylindrical gears and herringbone cylindrical gears

Driven Gear,Drive Gear,Gear Drive Speed Reducers,Driven Cylindrical Gear

Jilin Province Xuan Yi Trading Co.,Ltd. , https://www.xytruckparts.com

Due to the flammability and stringiness of the cables, in the event of a fire, the hazards are serious, especially in power plants and large substations. Once a fire occurs, it will affect other circuits. Therefore, the fire protection technology of power cables is one of the important technologies for the normal operation of electrical systems.

Power cables are an important part of electrical engineering and their role is to transmit and distribute electrical energy. The power cable is composed of insulated core wire, insulation sheath and protective layer. In order to adapt to various complicated laying environments, the power cable is designed to have good insulation performance, waterproof performance and mechanical performance. However, when overcurrent occurs in the cable circuit and the cable is overheated, the performance of the cable changes and a fire is then generated. This article intends to discuss the fire protection technology of the cable.

1, create a good operating environment to avoid cable insulation accelerated aging and damage cable trenches, cable tunnels should have good drainage facilities, such as the setting shallow shallow ditch, water collection wells, and effective drainage, if necessary, set up automatic start and stop pumping devices, Prevent water supply and keep interior dry. Cable trenches and tunnels maintain drainage slopes in the longitudinal direction. Prevent water, corrosive gases or liquids, and flammable liquids or gases from entering the cable trenches and cable tunnels. The cable tunnel should be naturally ventilated. When the normal load of the cable is used so that the air temperature in the tunnel is higher than 40 to 50°C, natural ventilation and mechanical exhaust can be used for ventilation. Ventilation system fan should be linked with the fire detector to ensure that the tunnel can automatically stop the wind when the fire occurs, the cable tunnel shall not be used as ventilation system inlet.

The practice of influencing the ventilation and heat dissipation of the cable should be avoided by keeping the fire door of the cable in the normally closed state, completely blocking the cable with a fireproof partition, and filling and sealing the gap of the cable trench cover. Moreover, the complete closure of the cable also makes it impossible to perform normal inspections of the cable and cannot detect cable faults in time.

In addition, there must be sound facilities to prevent rodents and snakes from entering and prevent small animals from destroying cable insulation and causing accidents.

2. Strengthen the cable's preventive test cable After the cable and cable accessories are installed, perform a DC voltage withstand test [preventive test]. Compare and analyze experimental data. That is, it can be compared with the experimental data of the same cable, and can also be compared with the historical data of the cable to explore the laws of experimental data. If a DC withstand voltage test is performed, the measured leakage current has one of the following conditions, and the cable insulation may be defective, reflecting the defect site and handling it:

(1) It rises faster with the increase of the test voltage value or the increase of the pressure time;

(2) Compared with the same cable, the value increases more;

(3) Compared with the previous data measured by this cable, there is a clear upward trend;

(4) The leakage current imbalance coefficient between three phases is large.

The above conditions should be carefully analyzed if the non-test method caused by improper income, you can increase the experimental voltage or extend the test time to determine whether the cable meets the conditions for continued operation.

For the DC withstand voltage test standard for power cables, see Chapter 17 of "Electrical Installation Installation Engineering Electrical Equipment Transfer Test Standards" (GB50150-91). The DC withstand voltage test value of a commonly used plastic insulated power cable is 4 times the rated voltage of the cable; the test time is 15 minutes.

3. Strong management and operation monitoring of cable head production quality According to statistics, cable fires and explosions caused by cable head failures account for about 70% of total cable accidents. The material and process quality of the empty cable head must be strictly controlled. The service life of the manufactured cable head must not be lower than the service life of the cable. The rated voltage level on the street and its insulation level must not be lower than the rated voltage level of the connected cable and its insulation level. The withstand voltage between the insulation mats on both sides of the insulation head shall not be less than 2 times the insulation level of the cable protective layer. The joint form should be compatible with the set environmental conditions, and it will not affect the capacity of the cable. Within the range of 2~3m on both sides of the cable head, fireproof tapes shall be used for fire retarding and burning treatment.

In general, cables look at the weak links of cable insulation, so strengthening the monitoring and management of cable heads is an important part of cable fire protection. The terminal cable head must not be placed in the cable trench, cable tunnel, cable tray box, and the intermediate cable gland in the cable jacket. It must be registered and used with various detection devices. When the cable head is found to have abnormal temperature rise or odor and smoke, the emergency exits early to avoid running on fire.

Between the intermediate cable heads should ensure a sufficient safety distance, more than two cable heads placed in the same position, between the cable head and other cables should take strict sealing measures.

4, to prevent other equipment fire ignition cable ignitable cable ignition oil-filled electrical equipment and coal handling, milling system, gasoline engine system. For them, corresponding measures must be taken: the cable trench cover near the oil-filled electrical equipment should be sealed, and the textile equipment flow to the cable trench to ignite the cable when the textile equipment fails to catch fire. The powder on the cable near the coal conveying and pulverizing system should be regularly cleaned to prevent the pulverized coal from spontaneously igniting the cable. The anti-riot door of the pulverizing system must have a fireproof slot box for the cable facing the explosion preventing the explosion-proof door action to ignite the ignition cable.

5, with the seal, plugging, coating, package and other measures to prevent the cable flame retardant fire retardant coating has a thin coating, does not affect the normal heat dissipation, while also playing a good thermal insulation and flame retardant effect, but there are many defects. Including improper selection of fire-retardant paint varieties, the market is in the fake and shoddy products for ten days; the practical application of the use of poor results, the surface of the ejection material there are peeling off, uneven coating thickness, cutting corners and so on.

The fire protection coating used in cable engineering is mainly solvent-based. Solvent-based solvents have problems in terms of toxicity, price, transportation safety, and ring contamination. Application effects such as cold resistance, water resistance, and oil resistance are not ideal. In particular, the bending resistance is not good, and the flexibility of the coating after curing is also poor, and it is only applicable to a fixedly mounted cable, and the coating is easily dried and peeled off.

Therefore, when the cable is not suitable for flame retardant use of a large number of fire-retardant paints, a large number of sealing, plugging, and blocking methods should be used. The following issues should be noted:

(1) The method of sealing, blocking, and separating must be used to ensure that a single cable catches fire and does not extend multiple cables. Cables entering the trenches, cable tunnels, cable trays, and cable jackets must be tightly sealed to prevent the ignition of a single cable or a small number of cables and ignite a large number of cables. A fire wall and fire door should be installed every 60 to 100 meters in cable trenches and cable tunnels. Fire barriers should be set up in the shaft. Fire barriers should be installed between the power cables and control cables. Control cables should be fireproofed or used. Fire-retardant cables to ensure that the main equipment can be safely stopped in any emergency.

Important cable channels should be equipped with automatic alarm and automatic fire extinguishing devices, such as water spray and water mist fire extinguishing devices, to achieve early detection and early suppression.

(2) The tightness and thickness of the fireproof plug must be guaranteed. If the fire blocking is not tight, the sealing effect will be lost, especially where the cables are concentrated, and soft plugging is used to ensure tight sealing. During the maintenance inspection, the damaged plugging should be restored in time. The thickness of the plugging material is not enough, and the fire will burn through the plugged material after the cable catches fire. The thickness of the plugging material should be in direct proportion to the number of plugged cables, and the more the cable, the thicker the blockage. Fire doors should be automatically closed after a fire.

(3) The fireproof plugging layer must be purchased with mechanical strength. Because the cable catches fire, especially the electric short circuit, will cause the air to swift and violently to expand to produce certain impulse, destroys the fireproof plugging layer with low mechanical strength, causes the fireproof plugging to lose the function.

(4) The fireproof plugging material is commonly used fireproof rock wool, asbestos board, asbestos rope, fireproof mortar and more advanced high-tech materials. The construction unit should select suitable materials according to the actual conditions of each project and different fireproof areas. And plugging methods. The main parts of plugging are high voltage and low voltage configuration electric rooms, power distribution shafts, fire control rooms, cable bridges, and power distribution lines that pass through the floor of the floor. Because of the flammability and stringiness of the cables, once the fire occurs, the damage is serious, especially In a power plant and a large substation, in the event of a fire, other circuits are affected. Therefore, the fire protection technology of power cables is one of the important technologies for the normal operation of electrical systems.

Economic Rifle Scope

Economic Rifle Scope,Scope With Adjustable Objectives,Scopes With Adjustable Objectives,Scope For Comfortable Shots

Shaoxing Snowpeak Sports Equipment CO.,LTD , https://www.snowpeakairgun.com