edition, Based on the 2011 National Electrical Code®
Guide to using this book
Practical Electrical Wiring covers all phases of a wiring installation—beginning with the necessary background theory and principles and on to the planning, installing, and finishing of residential, farm, commercial, and industrial jobs. Readers of previous editions will note a more advanced level of discussion reflecting the most current technical complexities. All new drawings and illustrations plus a new page design make instructions easier to follow and understand. To help you progress in your knowledge and skills, the book is divided into three parts—Wiring Principles, Residential and Farm Wiring, Commercial and Industrial Wiring. All three parts feature step-by-step instructions for quality work, with 450 drawings and photographs to enhance understanding.
Part 1, WIRING PRINCIPLES, provides the basic foundation for the parts that follow—the safety, practical, and legal considerations involved in wiring decisions and practices. This is essential reading before undertaking any electrical work. The standards and codes that help ensure safety are explained. Selecting proper conductors and how to connect them is covered in detail, followed by how to
safely ground the installation. Specific wiring methods and their latest NEC rules are detailed. The explanation of how electrical power is measured and delivered to users connects your installation to the broader picture and helps in understanding regional variations in electric rates. Chapters on planning residential installations, principles of good lighting, and an overview of residential and farm motors conclude Part 1. The principles and theory presented in Part 1 provide the background that can be applied to solving problems that may be encountered in unique situations.
Students and novices should read and thoroughly understand the background information in Part 1 before tackling wiring installations in Part 2. Experienced practitioners who want to review specific basics, check on 2011 NEC regulations, or benefit from the practical hints and shortcuts offered by author and NEC expert Frederic P. Hartwell, will find it easy to go directly to chapters and topics of particular interest. Part 2, RESIDENTIAL AND FARM WIRING, puts the principles established in Part 1 to work in the kind of wiring installations most commonly encountered in homes and on farms. Materials and step-by-step techniques are covered for every phase of the installation from installing and grounding service equipment, to roughing in a variety of outlets, and finishing with outlets, switches, and receptacles. Separate chapters cover specialized topics including limited-energy wiring, multi-circuits, old work, farms, on-site power generation, RVs and parks, and apartment buildings.
Part 3, COMMERCIAL AND INDUSTRIAL WIRING, opens with Hartwell’s unique approach to understanding one of the primary responsibilities in the electrical trade—selecting the minimum allowable size of wire for a given load. This approach (in the 18th edition) served as the basis for the wire selection example in the NEC [Annex D, Example 3(a)], and this edition tracks the actual NEC calculation. This chapter is followed by discussions of how wiring methods, planning, and lighting differ for nonresidential installations compared with the residential and farm installations covered earlier in the book. The wiring methods chapter has been reorganized to reflect the current market dominance of metal-clad cable over armored cable in this type of cabled wiring. The chapter on the wiring of motors in commercial and industrial applications (at not over 600 volts) builds on the motor basics provided in Part 1. The final chapter gives preview of more advanced work in wiring specific installations that should be undertaken only by those who have had much experience with more ordinary installations detailed in Parts 1 and 2, or who have received expert training on installations similar to those in this chapter.
Your keys to locating topics quickly and easily are the table of contents and the index. The detailed contents at the front of the book provides an overview of the wide range of material covered, and the remarkably comprehensive index at the back leads you to discussions of specific topics. With its many see also cross references to related topics, the index also serves a tutorial function in helping you see how a specific topic fits into the broader picture.