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Coffman's Method of Conduit Bending is a well-organized, comprehensive reference tool for bending conduit - available in both print and CD formats! A trusted and industry-recognized alternative, Coffman's Method of Conduit Bending offers electricians and electrical students a proven way to install conduit using all types of benders. This widely accepted method has saved many electricians time, effort, and money.
To familiarize readers with this methodology, the book begins with an introduction to conduit bending and the associated theories. Coverage then progresses to include coverage of three- and four-point saddles, 90 degree bends, and segment bending. With a print version that is small enough to be stored in a tool kit, and an interactive CD for self-paced learning, this promises to be a valuable resource, both in the field and in the classroom.
Features:
- Detailed illustrations clarify key steps in methodology and allow for greater comprehension.
- Reference tabs provide "at-your-fingertips" information, so you can easily target and access the content that they need.
- Examples are used throughout the book, clearly demonstrating how the methodology is applied in real-world situations.
- Step-by-step procedures explain all bends, encouraging retention of information.
From the Introduction
More than any other facet of the electrical trade, the apprentice and journeyman electrician should have a complete knowledge and understanding of the installation of electrical raceways. Electrical raceways, including conduit, cable trays, and gutters, comprise one-third and perhaps as much as one-half of the electrical work performed on a construction project, thereby requiring a timely and cost-effective method of installation. While this author agrees that it is not always necessary to be precise when installing conduit raceways in slabs, ceilings, and walls, there is nothing more professional looking than an exposed rack of conduits, all aligned and centered to each other. The goal of any journeyman electrician who is installing conduit should be to provide a professional installation that meets local and national codes, completed in a timely manner and with as little waste as possible. This kind of installation is not always possible using the simplified methods taught by other texts.
Coffman's method of conduit bending is easy, accurate, and comprehensive in its approach to conduit layout, cutting, threading, and bending. It provides the electrician with an organized and graphically illustrated quick-reference guide to the full array of bends used in the electrical industry. Coffman's method, although more advanced than other texts on conduit bending, is no more complex or time-consuming to use. Once the electrician has learned the method, he can implement it whether using a hand, wheel, or hydraulic bender. The basic mathematical skills required to complete the problems presented in Coffman's method of conduit bending include elementary trigonometry and basic algebra, the same skills necessary to enter the electrical industry as an apprentice or journeyman.
Additionally, this text will illustrate how the electrician will learn how to determine developed length, gain, center of bend, and the radius for any bend using any bender. To the author's knowledge, this information is not currently available in any other conduit-bending text.
About the Author
As a third-generation wireman, I have worked as a journeyman wireman and electrical engineer for more than 20 years. This book originated from the ideas taught to me by my father, who retired in 1987 from the I.B.E.W. Local 76 in Tacoma, Washington. I have published this compilation in honor of my father, Jerry Coffman, a master craftsman, and in memory of my beloved grandfather, Francis Coffman.
Over the years, it has been my privilege to work with and learn from friends and co-workers all across the United States. This experience has made it increasingly clear that more information is necessary to enable the wireman to understand how to use the new and more sophisticated equipment he or she will be encountering. If, by offering this text, I have made it possible to meet this challenge, I will have achieved a most important goal.
The mathematical theories and trade terminologies used in this text are not original with the author. However, the bending formulas are the design of Jerry Coffman. Countless apprentices and journeyman wiremen who attended his classes throughout his 30 years in the industry have used them with great success.
Table of Contents
Introduction. Chapter 1: Theory. Chapter 2: Kicks. Chapter 3: Offsets. Chapter 4: Rolling Offsets. Chapter 5: Three-point Saddles. Chapter 6: Four-point Saddles. Chapter 7: 90-Degree Bends. Chapter 8: Segment Bending. |
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