Johri) of the book is working as chief engineer E/M UPPWD and shall retire after completing his 37 years of service on 31st July 2010. After receiving his graduation in Electrical Engineering at Zakir Husain College of Engineering A.M.U. Aligarh in 1971, he joined UPPWD as Assistant Engineering through UPPSC 1971 Examination, in building division at Varanasi constructing prestigious buildings. He was promoted as Executive Engineering in 1979, as Superintending Engineer in 2000 and elevated as Chief Engineering in 2010. During his experience of 38 years, Mr. Johri has been associated with various building projects having prestigious all possible large electrical installations of the buildings. He has visited various Engineering projects, monuments and buildings throughout India and Singapore, Malaysia, and Thailand. Born in 1950 in an educationist family and brought up under able guidance of his father late Sri S.N. Johri, a teacher in Intermediate classes at Aligarh. He is married to the daughter of late Dr. S.B. Adaval head, department of Education at Allahabad University. Dr. Adaval represented India many years in UNESCO meeting. Uncle of Dr. Adaval late Dr. Babu Ram Saxena was Vice Chancellor Allahabad University. Sisiter-in-law of Dr. Saxena was late Smt Mahadevi Verma a great Indian Poetess. Inspired by his parents and in laws, Mr. H.M. Johri, being remained in academic environment dedicated his knowledge and experience into this book, a great effort to put all possible electrical installations together in book.