ELECTRICIAN’S EXAM - Craftsman Book Company

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ELECTRICIAN¡¯S

EXAM

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PREPARATION GUIDE

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Ninth Edition

Based on the 2014 NEC?

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by

John E. Traister

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Revised and Updated by

Dale C. Brickner

Includes inside the back cover:

Inside the back cover of this book you¡¯ll find a software download certificate. To

access the download, follow the instructions printed there.

? Contains all the questions in the book in interactive self-test software that makes

studying almost fun.

? Each answer is explained, and shows the pertinent NEC ? section at the click of

the mouse.

? Use the study mode to get an immediate response on each answer.

? Use the exam mode for a timed exam ¡ª just like the real one, and see your

grade when finished.

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Acknowledgments

I am indebted to several individuals and organizations who helped in the preparation of this book. One

group is the electrical examining boards throughout the United States. A list of these organizations

appears in Appendix I of this book. The following were especially helpful in furnishing reference

materials or else helping with the production.

National Fire Protection Association? (NFPA?)

C. Keeler Chapman, Artwork

Nicole L. Brickner, Typist and Organizer

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Joe A. Fintz, Final Exam Verification

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Ron Murray, Code Consultant

Floyd Richards, Question Verification & Code Consultant

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Portions of this publication are reprinted with permission from NFPA 70?-2014 National Electrical

Code?, Copyright ? 2013 National Fire Protection Association, Quincy, MA 02169. This reprinted

material is not the complete and official position of the National Fire Protection Association on the

referenced subject, which is represented only by the standard in its entirety.

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National Electrical Code? and NEC ? are registered trademarks of the National Fire Protection

Association, Inc., Quincy, MA 02169.

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Library of Congress Cataloging-in-Publication Data

Traister, John E.

Electrician's exam preparation guide : based on the 2014 NEC / by John E.

Traister, revised and updated by Dale C. Brickner. -- Ninth edition.

pages cm

Includes bibliographical references and index.

ISBN 978-1-57218-303-2 (alk. paper)

1. Electrical engineering--Examinations, questions, etc. 2. Electrical

engineering--Examinations--Study guides. 3. Electricians--Licenses--United

States. 4. National Fire Protection Association. National Electrical Code

(2014) I. Brickner, Dale C. II. Title.

TK169.T73 2014

621.319'24076--dc23

2014002984

?2014, 2011, 2008, 2005, 2002, 1999, 1996, 1993, 1991 Craftsman Book Company

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Contents

Introduction

..................................................... 5

1

Electrical Systems ¡ª General Requirements . . . . . . . . . . . . . . . 13

Chapter

2

Electrical Calculations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Chapter

3

Branch Circuits and Feeders . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59

Chapter

4

Electric Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Chapter

5

Distribution Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Chapter

6

Overcurrent Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Chapter

7

Utilization Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Chapter

8

Measuring and Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Chapter

9

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Electric Motors and Motor Controls . . . . . . . . . . . . . . . . . . . . . 203

Special Occupancies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

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Chapter 10

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Chapter

Chapter 11

Miscellaneous Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

Chapter 12

Transformers and Capacitors . . . . . . . . . . . . . . . . . . . . . . . . . . 257

Chapter 13

Electrical Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269

Final Examination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

Using the Interactive Study Center Download . . . . . . . . . . . . . . . . . . . . . . . . . . 340

Appendix I

State Contractor¡¯s Examination Offices . . . . . . . . . . . . . . . . . . 342

Appendix II

Answers to Final Exam Questions . . . . . . . . . . . . . . . . . . . . . . . 345

Index

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346

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Introduction ¡ª

How to Use This Book

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Understand also that the licensing authority

isn¡¯t the enemy. They aren¡¯t trying to keep you out

of the electrical business. They only want to set

some basic standards and be assured that your

installations will be done in a workmanlike manner and in accordance with the latest edition of the

National Electrical Code? (NEC?). The public

should be assured that all licensed electricians are

knowledgeable professionals. That¡¯s good for

society in general, and it¡¯s good for all professional electricians and electrical contractors who live

and work in your area.

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If you are just starting your career as an apprentice electrician, this book is also for you. It begins

at the beginning. You will have no trouble understanding what is explained here. Read each page

carefully and you will soon earn the recognition

that licensed professionals are entitled to in our

present society. The financial rewards are another

factor which will make your efforts worthwhile.

You can pass any electrician¡¯s exam, but only if

you study carefully each of the questions in this

book. What you learn from studying is the foundation on which your professional career will be

built.

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If you have been installing electrical systems for

some time as an apprentice, helper, or unlicensed

electrician, this book is for you. The information

between the covers of this book will cover every

subject that is likely to appear on most electrician¡¯s exams ¡ª either state or local.

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In most communities, any electrician working

without supervision must be licensed. For larger

electrical construction projects, many states now

require the certification of journeyman electricians

as well as specialty electricians, such as splicers of

high-voltage cable. This trend is certain to continue as legislatures recognize the need to protect the

public from incompetents. The state of Virginia,

for example, is now requiring all persons doing

electrical work to be licensed.

Most licensing authorities prepare demanding

exams that are a good test of the examinee¡¯s

knowledge. These exams help to guarantee that

electrical systems installed in building construction will meet minimum standards for protecting

the lives and health of building occupants (and the

buildings themselves) for many years to come.

This also helps to keep insurance rates to a minimum.

Begin your study for any electrician¡¯s exam

with two points in mind:

? Take the exam seriously

? Every minute spent studying this book

increases your chances of passing the exam

Unfortunately, there are too many applicants

who are not well prepared when they sit down to

take the electrician¡¯s exam. Taking an electrician¡¯s

exam without doing a good job of preparation is a

complete waste of time ¡ª both yours and that of

the licensing authority. The results are predictable.

Don¡¯t make that mistake.

The most common reason for failure is that the

applicant didn¡¯t study properly because he didn¡¯t

know how, or studied the wrong material. This

book should put an end to that excuse. You have in

your hands the most complete, easiest-to-use,

most practical reference available for preparing to

take the tests that are actually given today. Read

this book carefully, examine every question,

understand all the answers. Do this, and there¡¯s no

way you will be unprepared on examination day.

You are almost certain to score high.

All the common questions and answers are here,

but just knowing the answer is not always enough.

Sometimes it is just as important to understand

why a particular answer is correct. That¡¯s why

many answers include a quotation or reference

5

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