Chapter 1Safety Production Instructions for Electricians 001
1.1Laws and regulations on safety production 002
1.1.1Regulations on Management of Safety Technology Training and Assessment for Special Operation Personnel 002
1.1.2The Production Safety Law of the People′s Republic of China 003
1.1.3Other laws and regulations 006
1.2Safety protection and electric shock prevention measures 008
1.2.1Organizational measures to ensure the safety of electricians 008
1.2.2Technical measures to prevent electric shock 011
1.3Electrical accident and first aid for electric shock 019
1.3.1Harm of electric current to human body 019
1.3.2Causes and types of electric shock 021
1.3.3Electric shock mode 022
1.3.4Electrical accident 024
1.3.5First aid operation for electric shock 025
1.4Electrical fire protection, explosion-proof, lightning protection and anti-static 029
1.4.1Electrical fire and explosion prevention 029
1.4.2Electrical lightning protection and anti-static 032

Chapter 2Basic knowledge of electrical safety technology 035
2.1Basic knowledge of direct current (DC) circuit 036
2.1.1Circuit and its basic physical quantities 036
2.1.2Ohm′s Law 039
2.1.3Series and parallel connection of resistance 040
2.1.4Kirchhoff′s Law and its application 042
2.1.5Series and parallel connection of capacitors 043
2.2Basic electromagnetic knowledge 044
2.2.1Magnetic field of current 044
2.2.2Basic physical quantity of magnetic field 046
2.2.3Left-hand rule 047
2.2.4Electromagnetic induction phenomenon and Lenz′s Law 048
2.2.5Self-inductance and mutual inductance 050
2.3Fundamentals of alternating current (AC) 051
2.3.1Single phase sinusoidal AC 051
2.3.2Three phase AC 054
2.4Fundamentals of electronic technology 061
2.4.1Crystal diode and rectifier circuit 061
2.4.2Crystal triode and its amplification circuit. 066
2.4.3Voltage stabilizing circuit 070

Chapter 3Electrical tools and safety signs 073
3.1Use of electrical tools and safety tools 074
3.1.1Use of common electrical tools 074
3.1.2Use of other electrical tools 077
3.1.3Use of manual electric tools 080
3.1.4Use of electrical safety appliances 082
3.2Use of common electrical instruments 083
3.2.1Use of multimeter 083
3.2.2Use of clamp ammeter 094
3.2.3Use of insulation resistance meter 097
3.2.4Use of electric energy meter 100
3.2.5Use of ammeter 102
3.2.6Use of voltmeter 104
3.3Electrical safety signs 105
3.3.1Electrical safety color 105
3.3.2Electrical safety sign board 106

Chapter 4Low-voltage electrical apparatus 109
4.1Basic knowledge of low-voltage apparatus 110
4.1.1Classification of low-voltage apparatus 110
4.1.2Common terms of low-voltage apparatus 113
4.1.3Selection and installation of low-voltage electrical apparatus 114
4.2 Low-voltage circuit breaker and leakage protector 116
4.2.1Low-voltage circuit breaker 116
4.2.2Leakage protector 118
4.3Contactor and Relay 119
4.3.1Contactor 119
4.3.2Relay 122
4.4Fuse and master switch 128
4.4.1Fuse 128
4.4.2Master switch 130

Chapter 5Asynchronous motor 133
5.1Basic knowledge of asynchronous motor 134
5.1.1Brief introduction to motor 134
5.1.2Structure and principle of asynchronous motor 138
5.1.3Characteristics of asynchronous motor 142
5.2Starting and running of asynchronous motor 145
5.2.1Starting of asynchronous motor 145
5.2.2Running of asynchronous motor 150
5.3Fault inspection and maintenance of asynchronous motor 152
5.3.1Fault inspection and maintenance of three phase cage asynchronous motor 153
5.3.2Fault inspection and maintenance of three phase wound asynchronous motor 157

Chapter 6Electrical line 159
6.1Types and characteristics of electrical line 160
6.1.1Overhead line 160
6.1.2Cable line 163
6.1.3Indoor line 165
6.2Safety of electrical lines 165
6.2.1Conductivity 165
6.2.2Mechanical strength 166
6.2.3Spacing 167
6.2.4Identification and connection of conducting wires 168
6.2.5Line protection 175
6.2.6Line management 176

Chapter 7Electrical lighting 179
7.1Electrical lighting mode and type 180
7.1.1Modes of electric lighting 180
7.1.2Types of electrical lighting 182
7.2Installation and maintenance of lighting equipment 183
7.2.1Installation of lighting equipment 183
7.2.2Lighting circuit trouble shooting 189

Chapter 8Power capacitor 195
8.1Brief introduction to power capacitor 196
8.1.1Classification and application of power capacitors 196
8.1.2Structure and compensation principles of power capacitor 197
8.2Installation requirements and wiring of power capacitor 198
8.2.1Installation requirements of power capacitor 198
8.2.2Wiring of power capacitor 200
8.3Safe operation of power capacitor 202
8.3.1Operation and maintenance of capacitor 202
8.3.2Trouble shooting of capacitors 203

Chapter 9Use of safety tools (K1) 205
9.1Safe use of electrical instruments (K11) 206
9.2Use of electrical safety appliances (K12) 219
9.3Identify electrical safety signs (K13) 223

Chapter 10Safe operating technology (K2) 227
10.1Practical examination platform and examination instructions 228
10.1.1Cognition of practical examination platform 228
10.1.2Instruction to practical examination 232
10.2Simulation equipment examination training project 234
10.2.1Wiring and safe operation of electric drive circuit 234
10.2.2Wiring and safe operation of lighting circuit 244
10.3Equipment examination training project 255
10.3.1Wiring and safe operation of electric drive circuit 255
10.3.2Wiring and safe operation of lighting circuit 267

Chapter 11Elimination of potential safety hazards at the operation site (K3) 275

Chapter 12Emergency response at operation site (K4) 287
12.1Emergency response and first aid for electric shock 288
12.2Fire extinguishing simulation with fire extinguisher 294

Appendix 1Single choice question bank 299

Appendix 2Judgment question bank 349

References 405

Working with certificates for special operations is a mandatory requirement of The Production Safety Law of the People′s Republic of China, the Regulations on the Administration of Safety Technology Training and Assessment for Special Operation Personnel (Order No. 30 of the State Administration of Work Safety) and other local laws and regulations, which is related to safe production and the safety of the national economy and people′s lives and property.
The Low-voltage Electrician Certificate is one of the most widely used and representative one, but it currently has the following problems:
① Although there are hundreds of thousands of foreign employees in China, there are many deficiencies and blanks in relevant training and certification, one of which is the lack of textbooks;
② With the new Vocational Education Law of the People′s Republic of China as the prelude, the reform of vocational education in the new era would go overseas: the recruitment and training of foreign students in vocational education has been in full swing, but the teaching materials are almost blank;
③ The anti-globalization originated by the west would accelerate the ″going overseas″ of China′s industry and production capacity, especially for BRI countries, which would inevitably be accompanied by the ″going overseas″ of technology and standards, but the relevant carrier medias are extremely limited or even blank.
Therefore, the translating team hopes to help solve the above problems through the publishing of this book.
The translation of this book has received strong support from all parties: Prof. Qingde Yang, the chief editor of the Chinese version, has made a decision to support this job from stranger to full support through a 5-minute phone call, and has provided countless direct and comprehensive help throughout the translation process. After knowing that the funds were limited, Prof. Yang and his team immediately decided to waive the copyright fee. Their noble character and integrity contributed to the publication of the book; Mr. Gang Li, secretary of the Automobile Engineering School of Beijing Polytechnic, and Mr. Weijie Gou, director of the Automobile Manufacturing Technology Department of the same college, provided support in the whole process from project approval, funds, and until solving other difficulties in the process, making the publication of the book possible; Ms. Na Yu, the senior manager of the training department of Beijing Benz Automobile Co., Ltd., immediately provided various supports and volunteered to become a member of the translating team after knowing this job, sharing a lot of translation and proofreading work. I would like to express my sincere thanks to the numerous leaders, colleagues and friends who have given us help.
The translation and publishing time of the book is extremely tight, and the translating members have their own main jobs, all the jobs are completed in spare time, which is very heavy and urgent even if they are full-time. Here, I also pay high tribute to the members of the translating team.
Due to the limited capability of translation and the limited time, it is inevitable that there will be some mistakes or omissions. We hope our potential readers could give us your advice (qinhe848@163.com), with a view to revising it when it is republished.

Guoping Huang (Mr.)