Copyright Goodheart-Willcox Co., Inc.
The purpose of this text is to help the electrical practitioner—student, apprentice, journeyman, designer, engineer,
contractor, and maintenance person—working in the commercial electrical trade. It is written in clear and simple
language from one electrician to others.
Basic electrical concepts and theory are reviewed, but it is assumed the reader has some prior knowledge and
experience with electrical principles and electrical wiring. Every chapter is geared toward providing the practitioner
with state-of-the-art design criteria, methods, and requirements of the National Electrical Code®. A concentrated effort
has been made to be accurate in order to give the reader useful instruction and guidance that can be implemented in
the real, day-to-day practices of commercial wiring. This includes (but is not restricted to) installing, designing, trou-
bleshooting, and maintaining electrical systems, devices, and equipment.
The chapters are arranged in a logical sequence, but are not dependent on one another. Each could be studied as a stand-
alone entity. The chapters begin with clear objectives and close with review questions to reinforce what has been learned.
Hopefully, this volume will provide many instructive and useful bits of information to the reader. Your comments
and suggestions for additions and improvements are most welcome and will serve to enhance future editions.
Harvey N. Holzman
Acknowledgments
Few technical texts are produced by the efforts of one person. This text is no exception. Many individuals contrib-
uted their time and energy to provide much appreciated assistance and materials that enhanced the project. The
following individuals, companies, and organizations deserve credit for helping to create this quality text. I thank each
and every one of you for your unselfish contributions.
6
NFPA 70 ®, National Electrical Code ® and NEC ® are registered trademarks of the National Fire Protection Association, Inc., Quincy, MA.
Information and photos
Allen-Bradley
Appleton Electric Company
Arlington Industries, Inc.
Automatic Switch Company
AVO International and Biddle Instruments
Bussmann Division of Cooper Industries
Calculated Industries, Inc.
Channellock, Inc.
Chloride Systems
Construction Specification Institute
Cooper Industries, Cooper Power Systems
Crouse-Hinds Division, Cooper Industries
Eaton Corporation, Cutler-Hammer Products
Electrical Testing Laboratories
Fluke Corporation
Furnas Electric Company
General Electric Company
Greenlee Textron, Inc.
Hipotronics, Inc.
Ideal Industries, Inc.
International Association of Electrical Inspectors
Marc Kaducak
Jack Klasey
Klein Tools, Inc.
Kohler Company
The Langford Group
Preface