1, general requirements for distribution box and switch box:
1) The distribution box and switch box are made of iron plates, and the thickness of the iron plates is1.5 mm ~ 2.0 mm. ..
2) The distribution box and switch box must be installed with doors and locks, and the specialist is responsible for regular maintenance.
3) The distribution box and switch box should be equipped with electrical installation boards, which are made of iron plates or high-quality insulation boards to install supporting switch appliances.
4) The inlet and outlet of the distribution box and switch box shall be smooth round holes, equipped with inlet and outlet fixing clips, and the inlet and outlet shall be located at the lower bottom surface of their normal vertical installation position.
5) The size of the distribution box and switch box shall ensure that the internal switches are easy to install, wire, maintain and operate, and meet the relevant provisions of the electrical safety distance.
6) The distribution box and switch box at the construction site should be provided with at least two levels of leakage protectors, which should be current operated, and the box should be welded with grounding bolts to protect the zero connection (pe connection).
7) The appearance of distribution box and switch box should be waterproof and dustproof to meet the requirements of outdoor installation and use. Electrical appliances in the cabinet must be reliable and intact, and damaged or unqualified electrical appliances are not allowed to be used.
8) The load of switch, leakage and fuse in the cabinet must be equal to the rated current of the equipment. Do not use electric fuses with larger or smaller rated current, and it is forbidden to replace fuses with metal wires.
9) The distribution box and switch box should be installed in a dry, ventilated and normal temperature place, and installed correctly and firmly. Mobile distribution box and switch box should be installed on a solid support. The vertical distance between the bottom of fixed distribution box and switch box and the ground shall be greater than 1.3m and less than 1.5m, and the vertical distance between the bottom of mobile distribution box and switch box and the ground shall be greater than 0.6m and less than 65438.
10) Each equipment must have its own switch box, and "one machine, one brake and one leakage box" must be implemented. The position of the switch box meets the requirements of Technical Specification for Temporary Electricity Safety in Construction Site (JGJ46-2005).
1 1) The distribution box with more than three switches shall be provided with a master switch and a branch switch. Each shunt knife should not be connected to two or more electrical equipment, nor should it be used by two or more operating groups.
2. Electrical configuration of distribution box and switch box:
1) The main distribution box shall be equipped with main disconnector and shunt disconnector, main fuse and shunt fuse and leakage protector.
2) The distribution box shall be equipped with main disconnector and shunt disconnector, as well as main fuse and shunt fuse.
3) A leakage protector must be installed in the switch box. The leakage protector must meet the requirements of GB6829-86 leakage current action protector (residual current action protector).
4) The rated leakage action current and rated leakage action time of the leakage protector in the switch box shall be no more than 30mA and less than 0.1s..
5) The leakage protector used in damp and corrosive places should adopt splash-proof products, and its rated leakage action current should not be greater than 15mA, and its rated leakage action time should be less than 0.1s..
6) The leakage protector must be installed and used according to the product manual. For the leakage protector that has been put on hold for a long time and used continuously for one month, its characteristics should be carefully checked, and the problems should be repaired or replaced in time.
7) Leakage protector shall not be used directly instead of switch. When the earth leakage protector trips, it cannot be forcibly closed. Electricians should find out the reason, and then continue to use after troubleshooting.
8) During the inspection and maintenance of the distribution box, the corresponding power supply at the next higher level must be switched on and off, and a striking "power outage maintenance" sign board should be hung.
What are the precautions for using electricity in summer? Summer is the peak of electricity consumption. No matter refrigerator, air conditioner or water heater, every necessary electrical appliance in summer is an expert in burning electricity. Therefore, in addition to saving electricity at ordinary times, the safety performance of electricity consumption can not be ignored.
1. Don't overload electricity consumption: Before summer comes, you should calculate your total electricity consumption and compare it with the maximum rated current of electricity meter and power cord. If it is not enough, it should be reported to the power supply department in time to increase the capacity of the meter. It is best not to start high-power appliances such as air conditioners and microwave ovens at the same time, otherwise the instantaneous surge current will be too large, which will burn out the electric meter.
2. Be careful when connecting the power supply: in areas with complicated lines, the power supply should be installed by professionals, otherwise it will cause serious consequences. Copper wire and aluminum wire are prohibited. Replace the fuse; Signal transmission lines cannot be used instead of power lines; Medical leucorrhea and transparent belt cannot be used instead of insulating black belt.
3. Don't use "problem" electrical appliances: When electrical appliances are abnormal, such as odor, smoke, vibration, increased noise, etc., stop using them immediately. When the temperature rises, you should immediately cut off the power supply and ask a professional to repair it. Do not disassemble the electrical appliance by yourself, so as not to damage the internal components of the electrical appliance.
4. Place electrical appliances correctly: Place electrical appliances correctly to avoid long-term use. Electrical appliances must be placed in a dry, clean, ventilated place without direct sunlight or darkness. After the electrical appliances are used for a period of time, they should have a proper rest to avoid continuous use for a long time. Flammable articles are prohibited around electrical appliances. It is best to electrify and heat electrical appliances once a week for a long time. Anti-coma, moisture-proof and rust-proof. Many people like to wipe the surface of TV screen with a wet rag when watching TV. This is not correct. Never wipe household appliances with a wet rag when electricity is on. It is best to adjust the electrical equipment to the energy-saving state, the air conditioning temperature should not be too low, and the number of refrigerator doors should be reduced as much as possible. Don't be too bright on the TV or computer.
5. Plug and socket should be matched: the plug of the electrical appliance should be matched with the power socket, and it cannot be forcibly inserted to prevent the socket from being damaged and causing short circuit; It is forbidden to use electrical appliances with damaged appearance or exposed charged body; Do not enter the distribution room without permission, and do not place sundries on the distribution board and electrical equipment; After work, or when you don't use electrical equipment for a long time, please turn off electrical appliances, lights, air conditioners, etc. Don't use electric heating equipment such as induction cooker, rice cooker and electric stove to cook in the hospital; Don't connect too much power equipment, such as air conditioner, microwave oven, etc. , to the mobile terminal board; Avoid placing the wires of the mobile patch panel in places that are easily accessible in daily activities, and avoid placing the mobile patch panel directly on the ground to avoid danger; When cleaning, be careful not to splash water on electrical equipment.
6. Precautions for touching electrical equipment: In summer, people are prone to sweat, the human body resistance is correspondingly reduced, and the safety factor against electric shock is relatively weakened. Pay more attention to safety when touching electrical equipment to avoid electric shock accidents. If you find abnormal noise, smell, smoke, fire, etc. When, should immediately disconnect the power. Here, the online shopping network should remind users to use electricity safely and choose patch panels, switches and sockets with quality assurance.
7, don't use wet hands, wet cloth contact charged lamp holder, switch and socket.
8. The refrigerator should avoid being placed close to the wall: in wet weather, the wall is very wet, and the parts inside the refrigerator are affected by the small holes in the refrigerator, which leads to the humidity inside the refrigerator, so pay attention to the position of the refrigerator.
Keep a certain distance between the refrigerator and the wall, and give priority to a well-ventilated location.
What are the precautions for using temporary cards in Internet cafes? If you don't pay attention to it, you often play, and it's cheaper to be a member.
Remember to adopt
What are the precautions when using the refrigerator? 1. If the power supply voltage fluctuates greatly (such as repeated power failure), you should suspend the use of the refrigerator and unplug the power supply to prevent the compressor from burning out.
2. Don't turn on the power to start the compressor immediately after the refrigerator stops. Stop for 2~5 minutes before starting.
In case of temporary power failure, unplug the refrigerator first. During the power outage, the number of unpacking doors should be minimized. Usually, when the refrigerator door is closed, the food in the box can be kept fresh 15~20 hours.
4. In the process of using the refrigerator, pay attention to its refrigeration performance, and then choose a refrigerator temperature that is most suitable for your family. Changing the knob of the temperature controller can change the temperature of the refrigerator.
What are the precautions when using an induction cooker? Matters needing attention in the use of induction cooker
As a new type of kitchen cooker, induction cooker has been accepted by many families because it can steam, fry, fry and cook food, and has the advantages of saving electricity, high thermal efficiency, cleanliness, convenience and durability. But to really use the induction cooker and make it a good helper in the kitchen, please pay attention to the following matters when using the induction cooker.
First, the power cord should meet the requirements. Because of the high power of the induction cooker, when configuring the power cord, the copper core wire that can withstand the current of 15A should be selected, and the matching sockets, plugs and switches should also meet this requirement. Otherwise, when the induction cooker works, the heavy current will heat up or burn out the wires and sockets. In addition, if possible, it is best to install a fuse box at the power cord socket to ensure safety.
Second, put it flat. The desktop where the induction cooker is placed should be flat, especially when eating hot pot on the dining table. If the countertop is uneven and one foot of the induction cooker is suspended, the gravity of the cooker will force the furnace body to deform or even damage. In addition, if the desktop is tilted, when the cooker is heated by the induction cooker, the microseismic shock generated by the cooker is also easy to make the cooker slip out, causing danger. Third, ensure smooth pores. The working induction cooker heats up with the heating of the pot. Therefore. When placing an induction cooker in the kitchen, make sure that there is no object blocking the air inlet and exhaust holes of the furnace body. Do not pad (pile) objects and liquids on the side and bottom of the furnace that may damage the induction cooker. Need to be reminded that if the built-in fan of the induction cooker does not turn at work, it should be stopped immediately and repaired in time.
Fourth, the pot should not be too heavy. Induction cookers are different from stoves made of brick or iron, and have limited bearing capacity. Generally, the food in the cooker should not exceed 5 kg, and the bottom of the pot should not be too small, so that the pressure on the surface of the cooker will not be too heavy and concentrated. In case you need to heat an overweight and oversized pot, provide a separate support frame for the pot, and then insert the induction cooker into the bottom of the pot.
Five, clean the stove. Induction cookers, like other electrical appliances, should be waterproof and moisture-proof and avoid contact with harmful liquids. Do not put the induction cooker into water for cleaning and direct washing with water, and do not use solvent or gasoline to clean the furnace surface or furnace body. In addition, do not use metal brushes, emery cloth and other hard tools to wipe the oil stains on the furnace surface. To remove dirt, you can wipe it off with a soft cloth dipped in water. If it is oily, you can wipe it with a soft cloth dipped in a little low-concentration washing powder water. Do not use cold water to wipe the surface of the furnace in use or just finished. In order to avoid oil stains on the surface of the stove or the furnace body and reduce the workload of cleaning the induction cooker, when using the induction cooker, a piece of paper, such as waste newspaper, can be placed on the surface of the stove to absorb water, oil and other pollutants that jump and overflow from the stove, and the paper can be discarded after use.
Six, detection furnace protection function should be in good condition. The induction cooker has good automatic detection and self-protection functions. It can detect whether the furnace surface appliances (whether they are metal bottoms), whether they are used properly, whether the furnace temperature is too high, etc. If these functions of the induction cooker are lost, it is very dangerous to use the induction cooker.
7. Press the button lightly and simply. The button of the induction cooker is light touch. When using, don't use your fingers too hard, just touch them gently. When the pressed button is activated, keep your fingers away, and don't press it to avoid damaging the reed and conductive contacts.
Eight, furnace surface damage should stop. The surface of the induction cooker is a crystalline ceramic plate, which is fragile.
Master is too lazy to check for himself? Hehe ~ ~
What are the precautions for using electric hanging basket (1)? Electric hanging basket belongs to high-altitude manned lifting equipment, and must have independent safety ropes and safety locks to ensure the safety of operators. Strictly observe the safe operation when using.
Rules.
(2) Hanging basket operators must be in good health, free from diseases such as hypertension, and must be approved.
After training and internship, those who have obtained certificates can operate at their posts.
(3) the operator must strictly abide by the operating procedures, wear safety helmet and seat belt, and
Obey the instructions of the safety inspector.
(4) Before using the electric hanging basket every day, check and make preparations.
What are the precautions when using the oven? What does Sina decorate to rob the foreman to answer for you:
1, oven, oven, inflammable and explosive articles cannot be placed around the equipment.
2. Pay attention to the safe use of electricity. The oven should be placed in a dry place indoors to prevent vibration and corrosion. Choose enough power conductors and have good grounding wires.
3. For an oven equipped with an electric contact metal mercury thermometer, connect two wires of the electric contact thermometer to two terminals on the top of the box respectively, and insert an ordinary metal mercury thermometer on the exhaust valve (the thermometer in the exhaust valve is used to calibrate the electric contact metal mercury thermometer and observe the actual temperature in the box). After opening the hole of the exhaust valve to adjust the metal mercury thermometer of the electric contact to the required temperature, tighten the screw on the steel cap to achieve the purpose of constant temperature, but be careful not to turn the indicating iron out of the scale when adjusting.
4. When everything is ready, put the sample in the oven and turn on the power. The red light indicates that the box has been heated. When the temperature reaches the control temperature, the red light turns off and the green light turns on. In order to prevent the failure of temperature control, it is necessary to deal with it.
5. When placing samples, pay attention to that the columns should not be too dense. Do not put the sample on the radiator, so as not to affect the upward flow of hot air. It is forbidden to bake inflammable, explosive, volatile and corrosive articles.
6. When you need to observe the sample in the office, you can open the outer door and observe through the glass door. But in order to avoid affecting the constant temperature, it is best to open the door only a little, especially when working above 200℃. Opening the door may cause the glass door to burst due to sudden cooling.
7. In the oven with fan, the fan must be turned on in the process of heating to constant temperature, otherwise it will affect the uniformity of office temperature and damage the heating elements.
8. Turn off the power in real time after work to ensure safety.
9. Contact the inside and outside of the oven for cleaning.
10, and the temperature shall not exceed the highest temperature of the oven.
hope this helps
What are the precautions for expanding sentences? When expanding a sentence, we should add effective components reasonably according to the needs of expression, and don't pile up words with the same meaning stiffly, don't repeat them before and after, and don't change the meaning of the original sentence.
When completing the sentence expansion homework or test questions, if there are specific provisions on the expansion part, it should be expanded according to the regulations. If there is no regulation, it can be expanded as a whole. Don't forget to punctuate the extension.