The updated 16th edition of this book - a widely-used reference for both electricians and do-it-yourselfers - provides complete, detailed instructions for making safe and efficient electrical wiring installations. Based on the new, 1993 National Electrical Code, the book explains not only how to perform the operations covered but also why they are necessary. It aims to provide the background needed for a clear understanding of electrical principles without burdening the reader with overly-complex technical explanations and advanced mathematics. The book leads the reader step-by-step through the planning and layout of an electrical wiring system and provides complete requirements for each of the more commonly used wiring methods, overcurrent protection, grounding, and installation of devices. A wide variety of examples, tables and illustrations prompt the user through every step of the way.