If there is an interest in the electrician job, then continue. If not, advise you to choose another job of your own interest。
To continue further studies, it is necessary to first understand the algebra of high school, with high school physics. You don't have to be fluent. On this basis, participation in electrician training and examination for an electrician job certificate is further enhanced。
The need for electricians is felt in the basics of electrical power, the basics of maintenance and electrical power, and the commons of electrical power。
Look at some examples of utility electrical circuits and books on the subject! There is an overall improvement in the ability of electricians, whether installed or maintained, to learn in their own practice, but some with the best and the least knowledgeable spirit of asking, should be able to do their part。
The zero-easy start-up electronics technology (second edition) is an introductory book of electrical technology with nine chapters, including, inter alia, installation and safety of electrical infrastructure, electrical meters, low-voltage appliances, electrons, transformers, electrical motor and motor control lines and indoor distribution lines。
In order to enable beginners to easily and quickly enter the electrical technology portal by reading " zero starts and easy to learn " (second edition), the first page of each chapter contains a chart of the knowledge structure of this chapter and, in accordance with the principle of gradual progress, a bold approach to the easy-to-understood, focused and critical content of linguistic expression, so that readers can understand and remember it。
The zero-step easy-study electrical technology (second edition) has a low starting point, with a shallow depth of content, easy to understand language, and content structure in line with learning cognitive patterns. The " zero start-up earnings technology (second edition) " is suitable for self-learning books and for electronics teaching materials at vocational colleges. The electricians are divided into five levels. Skills identification is: junior (level 5), middle (level 4), senior (level 3), technician (level 2) and senior (level 1). Today's editor-in-chief is about the basic knowledge necessary for the electrician's entry. It is a rare thing to be so conscious about learning to practice. Electrical, a mature system chemistry, has a complete set of theories, supported by mathematics. The theoretical knowledge of electrical science used by electricians also depends on the basis of mathematics. The old saying, "you know it and you know it," the first thing you have to do now is to learn to do it with your master. And when the operation is done, you ask, "why?" "this might need to be explained by electron theory." so, you've learned the corresponding theoretical knowledge, and you've reached the level of knowledge. Before learning the theoretical knowledge of electricians, it is recommended that you review the mathematics of junior high schools and learn the theoretical knowledge of electricians。
One, right on the left。
Ii. Three-phase five-line colours for u, v, w and n protect the dual colour of the line (pe) in yellow, green, red and light blue。
In the course of operation, the camera flow of the transformer shall not exceed the rated current; the maximum uneven current shall not exceed the rated current of 25; and the transformer shall be periodically overhauled when it is operational。
4. It is not appropriate to protect the site and to protect the mixage in a system that provides electricity to the same transformer。
V. The rated voltage of the voltage intersensor 2nd cycle is typically 100 v。
The second side of the voltage interceptor shall not be short-circuited during operation. Since short circuits generate large short circuit currents and may burn the sensor, the one-time voltage sensor of the one-time voltage sensor is protected on the breaker。
7. The second side of the voltage interceptor shall be grounded. This was in order to prevent the breach of the insulation of the first and second circles from breaking into the second line at high pressure and endangering the safety of persons and equipment。
Viii. The current sensor works twice near short circuits. Second circle rated currents are usually 5a
Nine: the second side of the current sensor
X. The second side of the current sensor has to be grounded to prevent one or two sub-circle of insulation from breaking into the second side with one side of high pressure。
Xi. The current sensor is exposed to extremes of its one-time and second-tier circles, which are marked in less extreme numbers。
When installed, be careful that the connection is correct and reliable and that the secondary side does not connect to the melting machine or switch. Even if, for some reason, the secondary instrument or other device is to be removed, the short road on both sides must be removed and then removed。
Xiii. Low pressure switches are for quarantine switches, circuit breakers, smelting machines, etc. Under 1 kv
Xiv. The loads controlled by the low-voltage distribution equipment must be clearly separated and one gate is strictly closed to multiple tubes and confusion。
Xv. Low-voltage electrical distribution equipment shall operate reliablely with its own generator equipment. It is strictly forbidden to operate side by side with private operators in the grid。
16. An insulation pad shall be laid on the corridors where low-voltage distribution equipment is operated and maintained, and other items shall be prohibited from stacking within the corridors。
Xvii. Devices: first device, then power。
18. Dismantling devices: dismantling the power source before dismantling the device。
Interconnection: first zero and then fire。
20. Dismantling lines: dismantling lines before breaking zero lines。
Low-pressure smeltrs cannot be protected as electrically driven overloads。
The rated voltage of the smelter shall be greater than the working voltage equal to the distribution line。
The rated current of the smelter shall be greater than the rated current equal to the melting。
Xxiv. Dismantling machines must have a greater segment capacity than the largest short circuit currents that may occur in the distribution line。
Xxv. Quantification of the currents that select the melting quantity shall be consistent with the start-up and start-up currents of the normal working route。
For the protection of load short circuits such as electric furnaces and lighting, the rated current of the melt is equal to or slightly greater than the load fixed current。
Xxvii. For single-station electric motors, the melt-weighted current (1. 5 to 2. 5) sets the current。
