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Guide to the National Electrical Code, 2005 Edition:, 10th Edition

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Guide to the National Electrical Code, 2005 Edition:, 10th Edition

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Totally updated guide to the 2005 National Electrical Codefor Journeyman electricians, electricians in training, and electrical inspectors.

° Designed as a complete course textbook for anyone who wants to understand the National Electrical Code's rules.

° Presents proven strategies for passing the Master Electrician's Exam.

° Its in-depth coverage encompasses every key area of the Code.


  • Copyright 2005
  • Dimensions: 8-1/2" x 11"
  • Pages: 464
  • Edition: 10th
  • Book
  • ISBN-10: 0-13-148002-2
  • ISBN-13: 978-0-13-148002-5

All You Need to Succeed with the 2005 NEC: Practical, Illustrated, and Hands-On

This book gives working and student electricians practical guidance for using the new 2005 National Electrical Code effectively--plus all the resources they need to prepare for their Masters or Journeyman's licensing exams. Leading NEC expert and instructor Thomas Harman systematically covers electrical systems design, construction, and installation for virtually any residential, commercial, or industrial environment. Then, simply and concisely, he reviews the basic electrical theory and practice that every Master Electrician must know.

Designed for rapid learning, this book contains extensive problem-solving exercises, examples, illustrations, and tables--all fully updated for the 2005 code. Whenever an NEC rule affects a calculation, the author identifies that rule for easy reference. For the first time, this edition contains four full sample exams designed to closely resemble current Master Electrician's exams. All answers are provided and carefully explained.

This edition discusses

  • Wiring design calculations: general calculations, services, feeders, branch circuits, and more
  • Calculating wiring designs for residential, commercial, and industrial occupancies
  • Rules for installing branch circuits, feeders, services, high-voltage systems, general circuits/equipment, distribution equipment, and utilization equipment
  • Special equipment installations, including electric signs, data processing systems, and swimming pools
  • Special occupancies: hazardous locations, commercial garages, and gasoline dispensing or service stations
  • Emergency, standby, and communications systems
  • General electric theory: DC, AC, equipment, loads, conductors, transformers, and motors

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Table of Contents


1. Introduction.

    The Master Electrician and the Master Electrician's Examination

    How to Use This Guide

    The National Electrical Code

    State and Local Codes and Ordinances


2. Services, Feeders, and Branch Circuits.

    The Electrical System



    Branch Circuits

    Other Design Considerations--Temperature Ratings

3. General Design Calculations.

    Branch-Circuit Load Calculations

    Feeder or Service Calculations

4. Calculations for Dwelling Type Occupancies.

    One-Family Dwellings and Individual Dwelling Units

    Multifamily Dwelling Calculations

    Special Multifamily Dwelling Problems

5. Electrical Circuit Design for Commercial and Industrial Occupancies.

    Typical Commercial Occupancy Calculations

    Feeder and Service Design for Other Commercial Occupancies

    Special Occupancies and Equipment


6. Installation Rules for Specific Circuits or Systems.

    Installation of Branch Circuits

    Installation Rules for Feeders

    Installation Rules for Services

    Systems Operating at Over 600 Volts

    Miscellaneous Circuits and Systems

7. Installation of General Circuits and Equipment.

    Use of Conductors in Circuits

    Installation and Protection of Conductors

    Wiring Methods and Techniques

    Equipment Grounding and Bonding

    Equipment and Devices

8. Installation Rules for Distribution Equipment.

    Working Clearances

    Switchboards and Panelboards


    Installation Rules for Capacitors and Other Distribution Equipment

9. Installation of Utilization Equipment.


    Fixed Electric Space-Heating Equipment


    Miscellaneous Utilization Equipment

10. Special Equipment.

    Electric Signs

    Information Technology Equipment (Data-Processing Systems)

    Swimming Pools

    Miscellaneous Special Equipment

11. Special Occupancies.

    Hazardous (Classified) Locations

    Specific Class I Locations

    Other Special Occupancies

12. Special Conditions and Communications Circuits.

    Emergency and Standby Systems

    Remote-Control, Signaling, and Power-Limited Circuits

    Other Special Conditions

    Communications Systems

    Circuits and Equipment Operating at Over 600 Volts

III. General Electrical Theory.

13. Review of Electrical Theory.

    Direct-Current Theory


    Alternating-Current Theory

    Equipment in AC Circuits

IV. Final Examinations.

Final Examination No. 1

Final Examination No. 2

Final Examination No. 3

Final Examination No. 4


A. Important Formulas.

B. Answers.




Untitled Document

This edition covers the 2005 National Electrical Code. The text and questions and answers have been completely revised where appropriate to reflect the 2005 Code rule changes. New comprehensive examinations have been added to the chapters and a new final examination has been added. However, the successful style and format of the previous editions have been retained.

This book is in response to an increasing demand in the industrial and academic communities for a detailed guide to the National Electrical Code and the principles of electrical design based on the Code. In particular, the information presented should serve the aspiring Master Electrician as well as the practicing Master Electrician, and the electrical technology student. Each area of interest to the modern day electrician is discussed in detail with an ample number of example problems and their solutions. This Guide differs from other publications that treat the National Electrical Code in that the emphasis here is on the types of questions and problems that typically appear on Master Electrician's Examinations given throughout the country. Since these examinations reflect the knowledge expected of a Master Electrician in practice, their content has guided the authors in selecting material for this Guide.

The Master Electrician should be competent in three major areas, the first two of which are based on the National Electrical Code. The first two areas are (a) the design of electrical wiring systems, and (b) the construction and installation of electrical systems. The Guide covers these subjects in Part I and Part II, respectively. The third major area, presented in Part III of the Guide, is basic electrical theory and practice. This material is, for the most part, outside the scope of the Code although the Master Electrician is expected to be familiar with the principles presented in Part III.

This guide can serve as a self-study text or it can form the basis for a one- or two-semester course covering the rules of the National Electrical Code and related material. The Guide presents all rules and problem-solving techniques necessary to pass a Master Electrician's examination. The problems also treat practical situations arising in the design and construction of electrical installations. The only other reference text required is the National Electrical Code itself.

Part I of the Guide presents the rules and wiring design calculations required to determine the ratings of electrical services, feeders, and branch circuits for typical electrical installations. Beginning with a general discussion of these circuits, the chapters in Part I of the Guide present increasingly complex situations. The final two chapters in Part I, Chapters 4 and 5, present detailed calculations for the design of electrical systems in dwellings and in industrial or commercial occupancies, respectively. A quiz is given after each unit to summarize the knowledge in that unit and provide practice for the reader. A lengthy examination after each chapter covers the material presented in the chapter. Wherever a rule from the National Electrical Code affects a calculation, reference is made to the particular rule in the margin of the text.

Part II of this Guide covers the major sections of the National Electrical Code and provides summaries of important rules, which govern the construction, and installation of electrical equipment. A large number of tables, problems, and quizzes organize the material logically to aid the reader's understanding.

Part III of the Guide begins with a treatment of basic direct-current circuits. Subsequent sections present a review of the properties of conductors, basic alternating-current circuits, and equipment in ac circuits. The discussion and examples cover material useful for the solution of design problems presented in other parts of the Guide.

The final portion of the Guide, Part IV, contains examinations covering the material presented in the first three parts. The final examinations included there are representative of examinations for the Master Electrician's license given by various city and state examination boards.

The Appendices contain information of general interest, such as a detailed list of useful electrical formulas. Most important, the Appendixes contain the solutions to all quizzes, tests, and final examinations given in the Guide. The solutions to problems have been worked out in complete detail showing the method used and the appropriate references to the National Electrical Code.

Notes to the Student

Preparation for a Master Electrician's License is a long and difficult procedure involving practical experience and a thorough knowledge of the material presented in this Guide. A fundamental knowledge of elementary algebra and simple direct-current and alternating-current circuit theory is most helpful in fully understanding the approaches to problem solving taken in the Guide. If this material is not familiar to you, a self-study program or a course at a local community college covering these basic subjects would be helpful.

For students with the proper background knowledge, the Guide can be studied with the National Electrical Code to prepare for required city or state electrician's examinations. Each principle should be mastered before going on, although your study program may begin with Part I, Part II, or Part III of the Guide, depending on your previous knowledge or preference.

When you feel prepared, take the final examinations presented in Part IV of the Guide according to the directions and time limits specified for each test. The examinations may be scored by referring to the solutions given in the Appendices. Although a score of 70 percent is passing, a score of 80 percent or more on each examination indicates that you are well prepared for the real thing.

Notes to the Instructor

This Guide is unique because it presents the more difficult subject of electrical wiring design calculations in Part I and the general Code rules and basic electrical theory in Part II and Part III, respectively. This was done because many students who take courses covering the National Electrical Code are familiar with the general organization of the Code and its rules. It is necessary for those students to concentrate on problem solving rather than Code rules and basic theory that can be briefly presented and understood by the student. In addition, typical Master Electrician's examinations separate the questions concerned with wiring design from those dealing with installation and general electrical practice. To avoid confusing students, the instructor may divide this course similarly and begin with the most important subject, that of electrical design. The other Code rules and the basic theory support this activity.

If the students are not well prepared, the instructor might decide to begin with Part III, basic electrical theory, proceed to Part II, and finally present the design calculations of Part I. These three parts are not dependent upon each other; each contains quizzes and tests based on only the material presented in that part. The examinations in Part IV, of course, cover the entire range of topics presented in the Guide.

As an adjunct to the material in the Guide, it would be appropriate for the instructor to present rules that are covered by local ordinances. Such material could be added to the examinations given in the Guide.

Notes to the Practicing Electrician or Designer

This Guide has been prepared to explain in detail the use of the National Electrical Code, particularly as it applies to design of electrical wiring systems. With this intent, the Guide does not attempt to present design techniques that necessarily result in the most efficient or economical electrical system. For instance, no provisions are made for future expansion in the examples given in the Guide. The authors assume that experienced electricians or designers will use their own approaches to problem solving while using the Guide as a reference. In the same way, the selection of equipment such as circuit breakers and service equipment in the examples presented in the Guide is based on the minimum Code requirements. The rating of such equipment may be neither adequate nor convenient for a practical installation. The judgment of the designer must be relied upon to determine the design that best fits a particular installation.

The problems presented in Part I of the Guide deal with standard alternating-current circuits used as services, feeders, or branch circuits. Other special electrical systems such as two-phase alternating-current and direct-current installations are not discussed. The unique rules for these circuits concerning grounding, size of neutral, etc., will be found in the Code and should be used in addition to or in place of the rules presented in the Guide.

Finally, the design requirements for circuits supplying equipment such as x-ray machines are not covered in detail in the Guide. Reference is made when necessary to the appropriate section of the Code that covers such equipment.

The author appreciates the various comments received on the previous edition. In particular, a number of students in the author's National Electrical Code classes have made helpful suggestions that served to improve the presentation of the material. Readers can forward comments concerning this edition to the publisher or contact me at the e-mail address, harman@cl.uh.edu.

--Thomas L. Harman


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