Practical Math contains practical applications commonly used in a variety of industries and trades. Specific procedures vary with each task and must be performed by a qualified person. For maximum safety, always refer to specific manufacturer recommendations, insurance regulations, specific job site and plant procedures, applicable federal, state, and local regulations, and any authority having jurisdiction. The material contained herein is intended to be an educational resource for the user. American Technical Publishers, Inc. assumes no responsibility or liability in connection with this material or its use by any individual or organization.
American Technical Publishers, Inc., Editorial Staff Editor in Chief: Jonathan F. Gosse Vice President — Production: Peter A. Zurlis Digital Media Manager: Carl R. Hansen Assistant Production Manager: Nicole D. Bigos Technical Editor: Cathy A. Scruggs Copy Editor: James R. Hein
Editorial Assistant: Alex C. Tulik Cover Design: Robert M. McCarthy Illustration/Layout: Bethany J. Fisher Nicole S. Polak Nick W. Basham Robert M. McCarthy Digital Resources: Robert E. Stickley Cory S. Butler
The publisher acknowledges Sprecher + Schuh as well as the Air Conditioning Contractors of America for providing technical images and information.
NEC® is a registered trademark of the National Fire Protection Association, Inc. PowerPoint® is a registered trademark of Microsoft Corporation in the United States and/or other countries. QuickLink, Quick Quiz, Quick Quizzes, and Master Math are either registered trademarks or a trademark of American Technical Publishers, Inc.
© 2015 by American Technical Publishers, Inc. All rights reserved 4 5 6 7 8 9 – 15 – 9 8 7 6 5 4 3 2 1 Printed in the United States of America ISBN 978-0-8269-2250-2
This book is printed on recycled paper.
