On the electrician s side, electrician s side

1.How many watts of electrical appliances can be loaded into the meter 220V, 20A?

p=uicosφ=220v×20a×=

2.What is the maximum wattage of electrical appliances that can be loaded with a three-phase four-wire meter 40a? Is it possible to load so many watts of electrical appliances in each phase, or can so many watts of electrical appliances be loaded in total in three phases?

The three-phase meter 40A means that each phase can pass 40A of current. Therefore, if the load is single-phase, the wattage through which it passes is 220V 40A = that is, the load that can be passed through each phase. If it is a three-phase consumer, the power passing is p = (root number 3) uicos = where i is the line current that is said, so it is multiplied.

3.Is the circuit breaker 20a the same as the electricity meter?

Circuit breaker 20A means that the normal operating current is 20A. When a certain current is exceeded, and a certain time the circuit breaker can trip, while the meter cannot trip.

I'll tell you a basic formula: about 220A current in a kilowatt at 4V; At 380 (400) V, a kilowatt is about 2A

The marked voltage of the meter (watt-hour meter) is the working voltage of the meter, that is, the way to access the circuit, such as 220V, is one fire and one zero.

380V has three-phase four-wire and three-phase three-wire; Now it is basically three-phase and four-wire.

Jiangsu XX Power Supply Company.

The electrician certificate is divided into:

1. The electrician's network access operation license (installation and maintenance, which is divided into high-voltage, low-voltage and special) is the original power supply bureau of the Electricity Regulatory Commission.

2. The electrician's special operation certificate (mainly learning safety and basic knowledge of electricians is divided into primary, intermediate and advanced) is the original labor bureau of the safety supervision bureau.

3. The electrician technical grade certificate is the equivalent of the electrician's title of the Personnel Bureau.

Maintenance electricians: internal line, external line, high voltage, low voltage and so on. Electricians can work in factories, institutions, schools, rural areas, and other places where there is electricity.

Learn low-voltage maintenance electricians have to later appliances or appliances. Air conditioning maintenance helps. To learn electrician, you must first learn the basics of electricians, fitters and other knowledge, which is also the basic skill of home appliance maintenance.

There are two departments issued the electrician certificate, one is the Safety Supervision Bureau, which is called the operation certificate. One is the Labor Bureau, which is called the Grade Certificate.

The business scope of the electrical operation certificate of the Work Safety Supervision Bureau: electrician operation certificate (installation, maintenance, duty, power generation, power distribution, substation operation, explosion-proof electrical appliances, underground mine electrical fitters, experimental workers), low-voltage electrician operation certificate, high-voltage electrician operation certificate.

Electricians are divided into high and low voltage electricians, and weak electricians, all of which can be maintenance electricians, but the places are different. High-voltage electrical equipment, such as our common high-voltage cabinets, and various large machinery in mines. What is done at low voltage is generally to change the bulb, change the contactor or something.

Now the certificate is called special industry installation and maintenance. The network cables we use, the audio, and various integrated modules belong to the weak current electrician. If you want to learn to repair air conditioners, it will be different from these, and I personally think that the work on the circuit board is the most rare among electricians.

A maintenance electrician is not the same as a home appliance repairman! The operation certificate is universal, only divided into high pressure and low pressure

Every household is inseparable from electricity, and every minute and second is indispensable all year round. Cold weather is inseparable from electricity, hot weather is inseparable from electricity, and eating is inseparable from electricity, which is indispensable for every household.

There was a power outage, and now it was troublesome, and I didn't know if it was broken, or if it was really a power outage, so I had to pick it up and call the electrician, you hurry up and come to my house to see if the electricity is broken.

Electrician is a good technology, everyone needs, is a technology that many people are optimistic about, not only do things at home, but also many factories, companies, enterprises, hotels and hotels need electricians. It is true that electricians are a very hot industry, and they are also relatively easy skills.

Now the development of the electrical industry is relatively good, you can walk around the market and give yourself a reference and decision. You can also look at some well-developed cities. Good for you! I wish you success in your career!!

The electrical industry covers the manufacturing industry from power generation equipment, power transmission and distribution equipment, to a variety of electrical equipment (strong electricity), as well as basic components and basic materials for electrical engineering.

Include. Large Motors, Steam Turbines, Micro Motors, Electric Welding Machines, Transformers, Power Station Boilers, Power Electronics, Electrical Ceramics, Wires and Cables, Industrial Boilers, Heat Shrinkable Materials, Traction Electrical, Power Tools, High Voltage Switches, Welding Materials, Electric Carbon Products, Hydropower Equipment, Power Station Auxiliaries, Explosion-proof Electrical Appliances, Electrical Alloys, Insulating Materials, Lead-acid Batteries, Fractional Horsepower Motors, Power Capacitors, Small and Medium-sized Motors, Electronic Control and Distribution Equipment.

Industrial Household Appliances Internal Combustion Power Generation Equipment Insulator Arresters General Low-voltage Electrical Appliances Electric Furnaces and Industrial Furnaces Electrical Special Equipment.

Comprehensive unit enterprise, standardization committee, electrical equipment, mechanical structure, electrical accessories and household controllers, relay protection and automation equipment and other industries.

With the continuous growth of the electrical market capacity, the development trend of the electrical industry has been sharp, and many enterprises have taken advantage of this trend to pour into the electrical industry. In the huge lineup of electrical enterprises, NVC Electric work for the latecomer in the electrical industry, based on the fierce market competition, and according to the tenacious growth, lasted seven years, NVC Electrician has grown from the initial "not deeply involved in the world" to a "mature and steady" enterprise, a number of indicators in the forefront of the industry, especially in 2009 NVC Electric Wanzhou base officially put into operation, NVC Electric has achieved another leap.

Electricians are a basic trade, and it's good.

<> just Hu infiltrated the production, a little later, I hope to help Yu Zuoxiang you.

It's easy to implement. It is enough to program a program with a PLC.

1. Whether the electrical shell is metal or plastic, it should be grounded from a safety point of view, and the anchor bolt can play a certain grounding role, which can not be regarded as reliable grounding, and the grounding method is to add a grounding electrode or a special grounding wire to introduce. The earth insulation resistance is not large, it is a conductor, and grounding is a very effective and necessary measure to ensure safety.

Second, the grounding of the metal shed cannot guarantee that there will be no accidents at all, but it will greatly reduce the accident rate. And the method is simple, the investment is very low, why not?

Third, I don't think I need to think too much about this problem, focus on mastering the correct use of electric pens.

The second problem is not only to be properly grounded, but also to have a series of protections.

Three problems, insulation is not absolute. There is also a voltage tester that requires very little current.

The general household meter is one-way, that is, two in and two out, there are 4 wiring holes below, in order: 1 into the live line 2 out of the live line 3 into the zero line 4 out of the zero line, you described only three connected, must be 4 out of the zero line is not connected, the meter also goes as usual because the current coil of the meter has a live wire through, that is, a loop.

In addition, before the call, your home has electricity, because of the neighbor's generator credit, after the call, the neighbor stops the generator, back to the rock noise to restore the state of power supply, you have to turn off the total power supply of the alley, so your home has a small power outage for a while, there is electricity to use, it's okay, even if the dual power supply is powered, it's okay in a short time, if it's right, not only your home Shenfeng has electricity, and the neighbors share a route should have electricity, obviously your home should have electricity, it will not cause an impact, and normal electricity is the same. Under normal circumstances, if you want to generate your own electricity, you should cut off the power supply of the incoming line to prevent the sudden call from causing dual power supply.

It's not that there is a problem with the neighbor's wiring, is the electricity from his house also flowing backwards through the line to tell Qingyuan to come to my line, if so, will the balance state cause damage to the electrical appliances, and will there be a slow rush between the two fire wires.

1.The maintenance of high-voltage equipment must be reported to the chief in advance, and the work can only be carried out after the consent of the chief of duty.

2.The maintenance of high-voltage equipment must strictly implement the work ticket system, and fill in the first section according to the actual work needs.

1. Two types of work tickets.

3.The power failure of high-voltage equipment must strictly implement the operation ticket system, use the insulating rod and transmission mechanism to pull the high-voltage switch, wear insulating gloves, and lock or hang a sign on the operating handle after cutting off the power supply.

4.When checking the electricity, you must wear insulating gloves and insulated shoes, use the electroscope according to the voltage level, and check the electricity on both sides of the equipment or each phase of the line.

5.After verifying that the equipment or line is confirmed to have no voltage, the maintenance equipment or line can be short-circuited and grounded.

6.The installation of the grounding wire should be carried out by two people, first the grounding end, and then the conductor end. The order of dismantling is reversed, and insulation protective equipment should be worn when dismantling.

7.The grounding wire should use multi-strand soft and bare copper wire with a cross-section of not less than 25 2 and a special wire clamp, and it is strictly forbidden to use the method of winding to carry out a short circuit on the grounding.

8.In the case of partial power failure, the human body should keep a safe distance from the live part, and a shield should be installed, and a temporary shield should be kept at a distance from the live part, and a warning sign of "stop, high voltage danger" should be hung.

9. Regardless of whether the on-site substation and distribution high-voltage equipment is live or not, the maintenance personnel shall not work beyond the barrier.

10. The items removed during the overhaul should be placed in a unified order, and it is forbidden to throw the items indiscriminately.

11. After the overhaul is completed, the public tools and personal tools should be counted, and the temporary short-circuit grounding wire can be removed only after a comprehensive inspection.

12. Report the maintenance results to the value and make maintenance records.

1. The maintenance work on low-voltage equipment must be reported to the chief in advance, and the work can only be carried out with the consent of the chief.

2. For the work on the low-voltage switchboard, distribution box and power main, the second type of work ticket should be filled; The work on the low-voltage motor and the lighting circuit can be communicated verbally, and the above two jobs should be carried out by at least two people.

3. In the event of a power failure, the relevant power supply must be disconnected, the fusible safety must be removed, and the warning sign of "no closing, someone working" must be hung on the operating handle of the knife switch.

4. When working, it is necessary to operate in strict accordance with the safety technical steps of power failure, power inspection, discharge, and power outage card.

5. Before the on-site work begins, check whether the safety measures meet the requirements, whether the operating equipment and the maintenance equipment are clearly separated, and strictly prevent misoperation.

6. When inspecting each plate in sections, the warning rope should be pulled and the warning sign should be hung; When working on a fully or partially energized plate, there should be obvious warning signs on the maintenance equipment and operating equipment.

7. It is strictly forbidden to work with electricity.

8. During maintenance, the removed parts should be visited in a centralized manner, and the wiring sequence and wire number must be remembered before dismantling the wiring to avoid wiring errors.

9. After the overhaul is completed, the isolation knife switch will be sent after a comprehensive inspection, and after the trial operation, the results will be reported to the value and the maintenance record will be made.

Operate in strict accordance with various rules and regulations.