Pay attention to the suitability of choosing ppe

The core prompts: 1, commonly used wire, cable according to the use of what types? Answer: According to the purpose, it can be divided into bare wire, insulated wire, heat-resistant wire, shielded wire, power cable, control cable, and communication power. 1. What types of wires and cables are used according to their purposes?

Answer: According to purpose, it can be divided into bare wire, insulated wire, heat-resistant wire, shielded wire, power cable, control cable, communication cable, and radio frequency cable.

2. What are the types of insulated wires?

Answer: The common insulated wires are the following: PVC insulated wire, PVC insulated cord, PVC mixture insulated cord, rubber insulated cord, agricultural buried aluminum core plastic insulated wire, rubber insulated cotton yarn Textile cords, PVC insulated nylon sheathed wires, PVC insulated cords for power and lighting, etc.

3, cable bridge for what kind of occasion?

Answer: Cable trays are suitable for general laying of power cables and control cables for indoor and outdoor use by industrial and mining companies. They can also be used for indoor and outdoor installations in telecommunications, broadcasting and television departments.

What are the cable accessories?

Answer: The commonly used electrical accessories include cable terminal junction boxes, cable intermediate junction boxes, connecting pipes and terminals, steel wiring slots, and cable trays.

5, what is the cable middle connector?

Answer: The device that connects the cable with the cable conductor, insulation shield and protective layer to connect the cable line is called the cable middle connector.

6, what is the main electrical wiring?

Answer: The main electrical connection is the connection mode of the main electrical equipment and busbars in power plants and substations, including the main busbars and plant power systems according to certain functional requirements.

7. What rules should be followed when selecting the section of a power cable?

A: The selection of power cables should follow the following principles:

(1) The rated voltage of the cable shall be greater than or equal to the rated voltage of the power supply system at the installation point;

(2) The continuous allowable current of the cable shall be equal to or greater than the maximum continuous current of the supply load;

(3) The cross-section of the core must meet the requirements for the stability of the short circuit of the power supply system;

(4) Verify that the voltage drop meets the requirements based on the length of the cable;

(5) The minimum short-circuit current at the end of the line should enable the protection device to operate reliably.

8. What are the advantages of cross-linked polyethylene cable and oil-paper cable?

A: (1) Easy to install because it allows a small minimum bending radius and light weight;

(2) Not subject to line drop restrictions;

(3) Good thermal performance, allowing high working temperature and large transmission capacity;

(4) The cable accessories are simple and all have a dry structure;

(5) Simple operation and maintenance, no oil leakage problem;

(6) Lower prices;

(7) High reliability and low failure rate;

(8) There are few manufacturing processes, simple processes, and significant economic benefits.

9. What are the requirements for the clamp of a fixed AC single-core cable? why?

A: The fixture should be composed of no iron to form a closed magnetic circuit. This is because when the cable core passes current, magnetic lines are generated around it. The magnetic force line is proportional to the current flowing through the core. If using magnetic materials such as iron, according to Electromagnetic induction shows that eddy currents will be generated in the iron to heat the cable and even burn the cable. Therefore, it is not allowed to use iron pieces as fixing fixtures for single-core AC cables.

10. What are the biggest features and advantages of the following heat shrinkable cable head accessories?

A: The most important feature of the heat-shrinking attachment is the use of a stress tube instead of the traditional stress cone. It not only simplifies the construction process, but also reduces the size of the terminal of the joint. It is easy to install, saves time and labor, and is superior in performance, saving metal. The heat-shrinkable cable accessory sets the pouring type and the dry bag type, and combines the advantages of these two types of accessories.

11. What inspections should be performed before the cable is laid?

Answer: (1) The bracket should be complete and painted.

(2) The cable model, voltage, and specifications meet the design.

(3) The cable is well insulated. When there is doubt about the sealing of the oil-paper cable, it should be judged by moisture; the buried cable and the small-bottom cable should pass the DC voltage test and pass the test; the oil sample of the oil-filled cable should pass the test.

(4) The oil pressure of the oil-filled cable should not be lower than 1.47 MPa.

12. When there is doubt about the oil-paper-insulated power cable seal, how to use a simpler method to check whether the cable insulation paper is damp?

A: Insulate the cable insulation paper or put it in the cable oil of about 150°C. Check that there is no “click” or white foam, indicating that it is not wet.

13. What should be indicated on the cable signboard? What are the requirements for writing?

Answer: The cable design number, cable type, specification and starting point should be indicated on the signboard. The serial cable should be used in parallel. Requires clear writing and easy to fall off.

14. Where should the orientation mark of the buried cable be located?

Answer: At both ends of the cable, the cable connector 50~100m at the cable connector changes the direction of the cable.

15. To make yellow ribbons, black glass lacquer ribbons, and alkali-free glass ribbons for cable joints, how do you handle the tide before construction?

Answer: (1) Constant temperature drying method: The insulating tape is rolled into a small roll with a diameter of 25~30mm, placed in a constant temperature drying box at 110~120°C for 4~5h, cooled and dried, and put into a dry sealed tube.

(2) Oil immersing and draining tide method: Put a small roll of insulating tape into the cable oil at a constant temperature of 120~130°C, and keep a distance of 30mm from the bottom of the pot. After a certain period of time, the oil is no longer foamed, then it is taken out and stored. In tanks with cable oil, the oil level should exceed all enclosed objects and seal it.

16. What is the role of the cable sheath?

A: The inner sheath is protected from mechanical damage and chemical corrosion, enhancing mechanical strength.

17, outdoor cable ditch should meet what requirements?

Answer: The upper part of the cable trench should be slightly higher than the ground. Covers should be covered with concrete. The cable should be laid flat on the bracket and have a good drain.

18. What is the role of the sheath in the cable?

Answer: The insulation layer will not be in contact with water, air or other objects to prevent the insulation from moisture and the insulation layer from mechanical damage.

19, when using wire cutters should pay attention to what?

A: Before use, be sure to check the insulating handle insulation is intact, use wire cutters can not be cut over the specifications allow the metal wire, and the use of wire cutters instead of a hammer to beat the tool to avoid damage.

20, what is the dielectric strength?

A: In the electric field, when the electric field strength increases to a certain limit, the insulation material will be broken down. This electric field strength that causes insulation breakdown is called the insulation strength.

21, crosslinked heat shrinkable cable accessories What are the advantages?

A: This is a new type of material. Compared with other types of accessories nowadays, it has the advantages of superior electrical performance, small size, low quality, easy installation, and matching materials. It also has weather resistance, contamination resistance, flame retardance, self-extinguishing, etc. ability.

22. What are the requirements for the mechanical strength of the cable conductor connection point?

A: The mechanical strength of the connection point is generally lower than the tensile strength of the cable conductor itself. For a fixedly installed power cable, the tensile strength of the connection point is not less than 60% of the tensile strength of the conductor itself.

23. What are the main properties of the insulating material for power cables?

A; should have the following main features:

(1) High breakdown strength;

(2) Low dielectric loss;

(3) High insulation resistance;

(4) Excellent resistance to discharge performance;

(5) Has a certain degree of flexibility and mechanical strength;

(6) Long-term stability of insulation performance.

24. When laying cables, what are the requirements for traction strength?

A: For copper core cables, when pulling the head, the allowable traction strength is 70N/cm; for the aluminum core cable, when the head is pulled, the allowable traction strength is 40N/cm; if the wire mesh cover is used for traction, the lead protection Set cable allowable strength is 10N/cm;

Lead sheathed cable is 40N/cm.

25. What are the regulations for cable protection tubes?

Answer: (1) When the cable needs to wear a protective tube, the inner diameter of the pipe should not be less than 1.5 times the outer diameter of the cable, and the inner diameter of the concrete pipe, clay pipe, asbestos, cement pipe should not be less than 100mm;

(2) The bending radius of the cable tube shall comply with the provisions of the bending radius of the cable.

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Summer dress style is very much, we pick is also pick the eye, but there is always a favorite style, may be in many styles above we can not pick it out, then only two styles of circumstances you should not so difficult to choose It, Davina women's strapless, split two kinds of dress styles as you choose.

Start with bare shoulders, and now many girls do not self-confidence, it is because of their arms thick, so the choice of dress is a sleeve, but the sleeve may be a little hot, how to do? At this time you should dig a hole in the sleeve, which became strapless shoulder loaded, mint green shoulder strap installed professional side is very thin fashion.

Black split s******t with, split s******t can be fitted for any remind wear, do not feel the split s******t must be a good person to wear is not necessarily Oh, if you are a little fat sector, the legs a little thick, then split the s******t is You better groom leg style, black dress style, this split is a spinning modification is not self-cultivation of the fork, very elegant and very beautiful.

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Jacket is essential for everyone warm single product, which is inseparable from our daily life, but the beauty of women in the tangle of the road farther and farther, "so many jacket styles, what on earth do I wear?" What style of jacket popular this year ? Do not worry, Xiao Bian to tell you, that is, wild and classic earth color Oh.

This year should not have to worry about it, to prepare a very wild camel coat, has swept the fashion circle, camel coat with a white sweater, fresh and fashionable fashion, the lower half wearing a woman's accordion s******t, a little more fashion And vintage charm in it oh.

Do not love the full down jacket tired, crush who choose this year's popular earth color, such as gray down jacket Oh, gray knee long paragraph with dark gray letter sweater, with the same color with a harmonious and natural, use the lower body feminine S******ts do embellishment, this autumn and winter retro women have a taste of Oh.

Picture source: Fei Yi

Supporting Equipment Of Centrifuge

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Good news! Ou Yi Rui poetry this time brought us a gift, you look forward to it? A trusted brand in every new product will bring shock to the vast number of consumers, so this time the new Oui Rui poetry will be a heavy news. Dog days have come, then the fall will be far? Now to say nothing, Xiao Bian first to give you sister paper drying out a beautiful photo, do not be too excited!

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Wow Kaka is the only fast fashion personal clothing, led by the fashion industry renowned visual supervision SURE design team, with fresh popular elements, combined with the characteristics of Chinese people, continue to introduce the latest, coolest, the most stunning style, has been walking in the China's underwear industry's most cutting-edge fashion; wow Ka change a traditional apparel industry, "a small amount of" a variety of models, but "a variety of small amount of" so that there are new season, moon and new, weeks and weeks new. Can grasp the pulse of fashion at any time, reduce inventory risk; wow Ka determined to become everyone can afford the fashion brand, which ensures wow Ka in all stores have an extraordinary competitive strength, have a huge impact on other brands; Beijing Xidan Joy City, Shenyang Joy City, the dream of Shanghai Dragon, Shanghai Hongyi International Plaza, Zhengzhou City of Impression ...... In these influx of people can see the Waka figure. Single-store daily sales of more than 50,000 yuan, a single-month sales of more than 400,000 yuan, all sales of square meters are among the best ... ... Wow Ka not only by the hot pursuit of fashion, but also by the retail business unanimously approved and praised.

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Over the past 100 years, plastics has replaced other materials at an extraordinary speed and penetrated into our lives. Especially in the last 20 or 30 years, many items that traditionally have to be made from certain materials have become plastic products, and the most remarkable is the automobile and construction industry.

In many people's view, a typical car should be covered with steel bars. However, after years of development, the car has basically been reduced to a "iron shell," and even the iron shell is wrapped in a pile of so-called composite materials. . According to analysis by Luo Baihui, secretary-general of the International Mould and Metals and Plastics Industry Suppliers Association, the proportion of plastic weight in automobiles is currently close to 10%. On average, the average amount of plastic for each vehicle exceeds 100 kg in Europe, the United States and Japan, and about 80 kg in developing countries. With the development trend of “plastic-steel substitute steel” being increasingly recognized by the industry, the use of plastics to manufacture automobile core components has been infinitely close to industrialization, and all-plastic concept vehicles have emerged in recent years.

If the hub, chassis, and even the engine casing are all replaced with plastics, is there really no problem? Ultra-high-strength polyamide resins are far from being comparable to steel. Under the same conditions, the density of plastics is much lower than that of steel, which means that plastic-replaced steel can improve the performance while reducing the weight of the goods.

Plastics have not yet completely broken through the metal's line of defense, not a performance defect, but because of the high غير مجاز مي باشدt of high-strength plastics. For example, the weight requirements of aircraft are more demanding, and the غير مجاز مي باشدt pressure of the aircraft manufacturing industry is relatively small. Therefore, the weight of plastic in modern aircraft has reached 40%, and the Boeing 787 has even raised this figure to 50%, far exceeding Automotive industry.

Corresponding to the concept of “plastic substitute steel”, “plastic substitute wood” is also an important direction for the rapid development of plastics. The main base areas are the construction, home improvement and furniture industries. In a broad sense, the concept of "using plastic to substitute wood" should also include "using plastic to replace leather", that is, using artificial synthetic plastic to replace some traditional biological materials. Unlike “plastic-steel”, plastics are not mainly chasing performance improvements here, but rather the so-called “texture” enjoyment. Rosewood and leather are the symbols of taste. However, in real life, these materials are very scarce, and it is still plastic that can match them. Taking the floor as an example, the price per square meter of solid wood flooring is usually between 150-300 yuan, while that of PVC (6355, 40.00, 0.63%) is 40-120 yuan. PVC is a material that is famous for its plasticizers. It looks risky, but it is much safer than the formaldehyde produced by a fake solid wood floor. Under modern industrial conditions, PU leatherettes are more delicate and softer than leather. Polyester was not as airtight as it was in the Dacron era, and acrylics that sparkled like bright stones were mere transliterations of polyacrylic resins. They were essentially plastic.

As a consumer product for daily use, whether the mobile phone is used smoothly is actually to solve the use and aesthetic aspects, or "performance" and "texture." The metal apple product was once the best example to explain the perfect combination of the two, but the rapid development of plastics is constantly dominating this position. Nokia's plastic shell does not affect its most resistant word of mouth, and Samsung's plastic shell does not affect its beauty. According to analysis, the غير مجاز مي باشدt of the iPhone5C plastic case is lower than the iPhone5S's metal case by , but the is really not a high-end and low-غير مجاز مي باشدt gap. Perhaps, iPhone5C is just a powerful Apple company's helpless compromise on the material industry, because it will be abandoned if not accepted.

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I believe every woman's heart will have such a dream, to become radiant appearance as the focus of much publicity. Eye-catching, rely on Yan value alone is not enough, clothing is the key to wear, such a beautiful dream let thousands of women's fashion to help you achieve.

Thousands of flowers in full bloom spring elegant women accompany you spend, so you spend more than Jiao; sunshine like the summer of thousands of beautiful women with you walk through, let you become the summer dazzling scenery. Of course, this autumn and winter Thousands of Hui is still to be accompanied by your side, this Thousands of Hui, "Wind and Snow" 2015 Winter Order, showing a section of this winter's new product, whether it is color, fabric or style, thousands of Hui are the most exquisite Presented in your eyes, Thousands of Hui is the beauty of your choice.

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Do not wear jackets in summer? How to get cool in summer? Xiaobian have to say you are too young. what? Not convinced? Then listen to Xiaobian say one or two to make you convinced.

Only wearing a short-sleeved day, is it right? Yes, the temperature fluctuated, really puzzling, you can not compete with the weather, then you can only change yourself, wear a light jacket to go out for your body escort, the United States and the United States for your print design Extra points, easy to wear off, so that you are so beautiful at every moment delight.

We all know the dangers of UV, and sunscreen body painting and it seems a bit unrealistic, and regular makeup for lazy sister who is also a burden, this time to a long jacket as a sunscreen to deal with Is not the "poisonous" sun like a rainy day? Simple and without losing the sense of design, the thin shirt to bring a sense of both the sense of perspective and charming, do not worry about black heat to the skin to bring the burden, ice silk material will keep your body temperature in a fresh state, , Is to make you beautiful and healthy.

Photo credit: Top McPhee

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In a series of brands have released the 2017 autumn and winter series, Beiyan 2017 autumn and winter series will be released soon. So, compared with the previous season, what are the highlights this season?

Beiya Yan 2016 autumn and winter series of the main wool material, the brand has continued the elegant style, through the design of meticulous and simple cut, highlighting the warm nature of the wool material itself, while maximizing the elegant elegance of clothes. Wool jacket, turtleneck sweater, double-sided coat is the representative of the previous season's clothing, each one in the design of the pursuit of minimalist cut tailoring style, just the right interpretation of Pu Ya Yan elegant spirit.

BEIYAYAN Pu Ya Yan 2016 autumn and winter series

Compared with the 2016 autumn and winter series, 2017 autumn and winter series there will be some changes. In the material selection will no longer be limited to the wool, the core is still to convey the elegance of Beiya Yan. Cut through the clean design to show the elegant women's charm. To this end, this series is still autumn and winter by France Beja Yen designer surgeon design, combined with Chinese personal characteristics and spending habits, to bring them a new elegant design. At the same time, autumn and winter series in this season, will also continue the use of local elements, specifically announced at the time of product release.

At the same time, the number of styles and styles of clothes in the season also more than the previous quarter, thanks to the Beja Yen brand's reputation accumulation. After more than a year, more and more local consumers in China began to understand and understand the Beya Yen brand, which also increased the brand awareness of Beya Yen and boosted the sales of the brand. As a result, Beya Yen continued to grow momentum. Therefore, this season's autumn and winter series, compared to the previous season, both in style and quantity of clothes have increased.

BEIYAYAN Pu Ya Yan 2016 autumn and winter series

Follow the French romantic tradition, passing the spirit of elegant dress, Beja Ya eternal core values. Beja Yan 2017 autumn and winter series is expected to be officially released in late August, welcome attention Beja Yan No. byyfs99 official public attention related to new product launches information.

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Han Lier underwear will love the concept of health and the essence of fashion underwear integration, the breast bra breast regardless of material, technology, or style design, are walking in the forefront of the international health underwear products. Ten years of grinding sword, Han Lier brand underwear in the creation of high standards, high standards and high quality to lay the King style, a strong service guarantee system is the basis for the success of investors.

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