iii Preface Modern Residential Wiring provides you with a solid background of electrical principles and prac- tices, as well as a thorough understanding of National Electrical Code®* requirements. Once having mastered the information provided here, you will be well equipped to design and install modern and safe residential wiring systems that meet the electrical power demands of today’s world. Modern Residential Wiring covers not only the “how” but also the “why” of safe electrical wiring practice. Although the content is concerned primarily with residential installations, many of the same concepts and principles may be applied to commercial and industrial electrical construction. The chapters are arranged in a logical sequence. The order of instruction follows the normal or- der in which an installation is made. However, each chapter is designed to stand alone and may be studied independently to suit a specifi c need. Modern Residential Wiring makes the study of electrical wiring easy. Even the most complicated procedures are explained in a clear, simple, easy-to-understand manner. Procedures are presented “step-by-step,” while the many illustrations are fully integrated into the easy-to-read text. The il- lustrations should be carefully examined as they will often clarify and explain the more diffi cult principles of electricity and the requirements of the National Electrical Code. The principles of electricity remain fi xed. However, the methods, materials, and tools of the trade are continuously evolving. Modern Residential Wiring presents both the fundamentals of electrical wiring and the latest practices used in the trade. This new edition of Modern Residential Wiring is revised to be consistent with changes in the trade practices, materials, and the requirements of the 2020 National Electrical Code. The author wishes to express his sincere appreciation to each of the individuals, organizations, and associations that provided input, assistance, and illustrative materials for this new edition. A special thanks to my wife, Linda, for her active assistance in the creation of this edition. Harvey N. Holzman About the Author Harvey N. Holzman is a licensed Master Electrician with 45 years of hands-on experience in sev- eral states, including New York, Florida, Kansas, North Carolina, Pennsylvania, and Texas. Besides owning his own electrical contracting services company, Mr. Holzman has worked for several major constructors at both refi neries and power generating stations, providing consulting, supervision, and fi eld engineering. He has been a member of many electrical trade organizations and has trained doz- ens of individuals, many of whom have gone on to become master electricians. *NFPA 70®, National Electrical Code®, and NEC® are registered trademarks of the National Fire Protection Association, Quincy, MA.