INTENDED USE AND LEVEL
Electrical Wiring Commercial is intended for use in commercial wiring courses at twoyear and four-year colleges, as well as in apprenticeship training programs. The text provides the basics of commercial wiring by offering insight into the planning of a typical commercial installation, carefully demonstrating how the load requirements are converted into branch circuits, then to feeders, and finally into the building’s main electrical service. An accompanying set of plans at the back of the book allows the reader to step through the wiring process by applying concepts learned in each chapter to an actual commercial building, in order to understand and meet Code requirements set forth by the National Electrical Code.
SUBJECT AND APPROACH
The fifteenth edition of Electrical Wiring Commercial is based on the 2014 National Electrical Code. This new edition thoroughly and clearly explains the NEC® changes that relate to typical commercial wiring. The National Electrical Code is used as the basic standard for the layout and construction of electrical systems.
To gain the greatest benefit from this text, the learner must use the National Electrical Code on a continuing basis. State and local codes may contain modifications of the National Electrical Code to meet local requirements. The instructor is encouraged to furnish students with any variations from the NEC as they affect this commercial installation in a specific area. This book takes the learner through the essential minimum requirements as set forth in the National Electrical Code for commercial installations.
In addition to Code minimums, the reader will find such information above and beyond the minimum requirements. The commercial electrician is required to work in three common situations: where the work is planned in advance, where there is no advance planning, and where repairs are needed. The first situation exists when the work is designed by a consulting engineer or by the electrical contractor as part of a design/build project.
In this case, the electrician must know the installation procedures, be able to read and follow the plans for the project, be able to understand and interpret specifications, and must know the applicable Code requirements. The second situation occurs either during or after construction when changes or remodeling are required. The third situation arises any time after a system is installed. Whenever a problem occurs with an installation, the electrician must understand the operation of all equipment included in the installation in order to solve the problem. And as previously stated, all electrical work must be done in accordance with the National Electrical Code and any local electrical codes.
The electrician must understand that he or she is a part of a construction team with the goal of getting the project completed on time and within the budget. Cooperation and “pulling your load” are the keys to success. The general contractor and owner count on every trade and specialist to get the components on the job when they are needed and install them so as to keep the project moving ahead smoothly.