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This book is a technical manual tailor-made for electrician practitioners. Its content is based on the technical standards of the national electrical industry, and comprehensively and systematically explains the professional knowledge and practical skills of the electrical industry. In view of the technical characteristics and job requirements of the electrician field, this book carefully organizes and divides the knowledge and skills required for electricians to work in the field. It combines the training characteristics of the electrician industry and readers' learning habits, and adopts a new explanation model with 20 modular structures. The main content includes: basic introduction to electricians, used devices and electronic components, basic electrician drawing recognition, use of common tools and instruments, electrician safety and first aid, basic electrician welding skills, and basic electrician inspection. Testing skills, line processing and connection skills, basic electrician wiring and equipment installation skills, lighting control circuits and maintenance and debugging, indoor weak current line wiring, power supply and distribution circuits and maintenance and debugging, building monitoring systems, community broadcast systems, maintenance and disassembly skills of elevators, transformers and motors, common control circuits for motors and maintenance and debugging, use and debugging of frequency converters, PLC technology programming and common control circuits, and comprehensive application control of electromechanical equipment. This knowledge content covers the current main job requirements in the electrician industry, focusing on the systematic nature of electrician knowledge and emphasizing the practicality of plumbing and electrician skills. This book uses a new interactive teaching model of micro-video explanation.