This book has been written with the specific aim of furnishing the necessary fundamentals of 'Maintenance of Electrical Equipment, to the students and covers the syllabi of final year Diploma course according to the Board of Technical Education Delhi Administration, Delhi. Since efforts have been made to present the subject matter in the most simple and easy to understand language. The relevant theory is arranged in the form of serialized articles which are concise, compact and to the point. Due care has been taken of the examinations needs of the students. Frequent use of figures has been made for clarity. In the present edition of this book, I have undertaken a thorough revision of the subject. Three important factors underlying the revision have been : Firstly the modified set up of the relevant portion of some chapters, secondly the addition to my own experience in the field and thirdly the most in valuable suggestions given to my fellow colleagues, teachers and students.* Principles and Planning of Maintenance * Heating and Ventilation of Electrical Machines * Mechanical Features of Electric Motors * Possible Faults, Their Causes and Repairs in A.C. Single Phase Induction Motors and D.C. Motors * Lubrication System * Study of Alternating and Direct Current * Extracts from Indian Electricity Rules-1956 * Alternating Current Motors * Alternating Current Generators * Direct Current Motors * Direct Current Generators * Conversion of Alternating Current into Direct Current * Transformers * Installation and Commissioning of Transmission Lines and Distribution Lines * Underground Cables and Various Faults, Their Identification and Location * Switchgears * House Installation Maintenance * Importance of Earthing, its Testing and Maintenance * Fire and Fire Fighting Equipments * Electric Shock * Batteries * Maintenance of Lifts and Cranes * Control Gears and Contactors * Remote Control System.