Audel Installation Requirements of the 2002 National Electrical Code


A practical guide to the 2002 NEC

As an electrician, your interest in the NEC is application specific. You need the parts that relate to your job, clearly organized so you can find what you need, and geared to what you do. This book is the 2002 NEC for the installer, with easy-to-follow chapter headings to help you find important ...

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A practical guide to the 2002 NEC

As an electrician, your interest in the NEC is application specific. You need the parts that relate to your job, clearly organized so you can find what you need, and geared to what you do. This book is the 2002 NEC for the installer, with easy-to-follow chapter headings to help you find important information quickly, and explanations that make sense. You'll want it with you on every job.
* Find those parts of the NEC that matter to your job - nothing more
* Understand all general and basic requirements
* Identify specific standards for multiple buildings sharing service
* Know the rules regarding surge arrestors, grounding connections for AC systems, and grounding for separately derived systems
* Review the requirements for wiring in all types of cable and conduit
* Look into code requirements for specialized applications like hospitals, motion picture studios and theaters, RV parks, and swimming pools

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Product Details

  • ISBN-13: 9780764542787
  • Publisher: Wiley
  • Publication date: 1/2/2004
  • Edition description: All New Edition
  • Edition number: 1
  • Pages: 288
  • Product dimensions: 8.50 (w) x 5.50 (h) x 0.66 (d)

Meet the Author

Paul Rosenberg is a master electrician and a leading voice in the electrical industry. An instructor at Iowa State University, he has written training courses for NECA and articles for all major industry publications as well as Audel Electrician's Pocket Manual, 2nd Edition.

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Table of Contents

Ch. 1 General Requirements 1
Ch. 2 Branch Circuits 5
Ch. 3 Feeders 13
Ch. 4 Services 17
Ch. 5 Overcurrent Protection 27
Ch. 6 Grounding 33
Ch. 7 Wiring Requirements 53
Ch. 8 Wiring in Cable 63
Ch. 9 Wiring in Conduit 91
Ch. 10 Raceways and Wireways 101
Ch. 11 Busways 115
Ch. 12 Outlet and Pull Boxes 121
Ch. 13 Switches and Switchboards 129
Ch. 14 Cords 131
Ch. 15 Lighting Fixtures 135
Ch. 16 Receptacles 141
Ch. 17 Appliances 143
Ch. 18 Motors and Controllers 149
Ch. 19 HVAC Equipment 161
Ch. 20 Generators 163
Ch. 21 Transformers 165
Ch. 22 Capacitors, Resistors, Batteries 169
Ch. 23 Hazardous Locations 171
Ch. 24 Service Stations 181
Ch. 25 Bulk Storage Plants 185
Ch. 26 Spray Areas 189
Ch. 27 Health Care Facilities 191
Ch. 28 Places of Assembly, Theaters, Motion Picture and Television Studios 193
Ch. 29 Signs 197
Ch. 30 Manufactured Wiring Systems 199
Ch. 31 Mobile Homes and RV Parks 201
Ch. 32 Data Processing Areas 209
Ch. 33 Swimming Pools 213
Ch. 34 Solar Electric Systems 221
Ch. 35 Emergency Systems 225
Ch. 36 High Voltage 229
Ch. 37 Low Voltage 233
Ch. 38 Fiber-Optic Cables 239
Ch. 39 Communications 243
Ch. 40 Special Installations 247
Glossary 251
Index 255
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First Chapter

Audel Installation Requirements of the 2002 National Electrical Code

By Paul Rosenberg

John Wiley & Sons

ISBN: 0-7645-4278-8

Chapter One

General Requirements

General Requirements (Article 110)

The first requirement of the National Electrical Code is that all installations must be performed "in a neat and workmanlike manner." In other words, all electrical installation requirements presuppose an installer who is concerned, informed, and thinking. Without this prerequisite, any other requirements are almost worthless.

Basic Requirements (Article 110)

The following basic requirements apply to all electrical installations. They should be reviewed periodically by every electrical installer.

All unused openings in boxes, cabinets, etc. must be filled.

All equipment must be securely mounted. Wooden plugs in masonry are not allowed.

Panelboards and other exposed buswork must be protected from paint, plaster, or other similar materials during the construction process.

Conductors in manholes must be racked to provide a reasonable amount of access space.

Free circulation of air around electrical equipment, especially equipment that requires such air flow for sufficient heat removal, can't be obstructed.

All electrical connections must be made with devices that are listed and clearly marked as suitable for the intended use.

Conductors must be spliced with suitable splicing devices, or by soldering, brazing, orwelding. Soldered splices must first be joined, so that the splice is not dependent on the solder for mechanical or electrical strength. All splices must be covered with insulation equivalent to that of the conductors.

Wire connectors (lugs, wire nuts, etc.) must be rated no lower than the operating temperature of the conductors they are used with.

A reasonable amount of working space must be provided around all electrical equipment. Generally, the minimum is 3 feet. Table 110.26(A)(1) shows specific requirements.

Lighting, enough to work on the equipment, must be provided in the areas around electrical equipment.

Except for panels of 200 amps or less in dwelling units, there must be a minimum head space in front of electrical panels of 7 feet.

All live parts operating at over 50 volts must be guarded against accidental contact by persons or objects. See Section 110.31 for operation at over 600 volts. The primary methods of accomplishing this are as follows:

Locating the equipment in a room that is accessible only to qualified persons.

Installing permanent and effective partitions or screens.

Locating the equipment on a balcony or platform that will exclude unqualified persons.

Locating the equipment 8 feet or more from the floor.

Guards must be installed to protect electrical equipment from physical damage where necessary.

Entrances to rooms or areas where there are live parts must have a sign posted forbidding unqualified persons from entering.

All disconnecting means (service, feeder, or branch circuit) must be marked, showing the purpose. This is not required if the purpose of the disconnecting means is obvious.

Exposed parts of high- and medium-voltage systems must have adequate clearance above working spaces. Table 110.34(E) lists these distances.

Use of Grounded Conductors (Article 200)

All premises wiring systems must have a grounded conductor, except where the NEC specifically permits otherwise.

A grounded conductor must have insulation that is equal to that of any ungrounded conductors it is used with.

A grounded premises wiring system must receive its power from a grounded supply system.

A grounded conductor No. 6 or smaller must be covered with white or natural gray insulation (Figure 1.1), except:

1. Fixture wires.

2. Aerial cables can use a ridge on the grounded conductor, rather than a different color of insulation.

3. Where only qualified persons will have access to the conductors, colored conductors can be taped or painted white or gray at their terminations.

4. Grounded conductors in MI cables can be identified otherwise.

Grounded conductors No. 4 or larger can be identified either by having white or gray insulation, by having three longitudinal stripes 120 degrees apart, or by having a white marking at terminations.

If grounded conductors of different systems are installed in common boxes, raceways, etc., the first system must be marked as above, the second system's grounded conductor must be identified by having white insulation with a colored (but not green) tracer, and any other systems must have their own means of identification.

Cables to switches can use the grounded (white) conductor to bring power to the switch, but not from the switch (Figure 1.2).

Terminals used specifically for grounding conductors must be identified by a color sufficiently different from that used for other terminals.

For devices with screwshells, the grounded conductor must be connected to the screwshell, not to the tab, as shown in Figure 1.3.


Excerpted from Audel Installation Requirements of the 2002 National Electrical Code by Paul Rosenberg Excerpted by permission.
All rights reserved. No part of this excerpt may be reproduced or reprinted without permission in writing from the publisher.
Excerpts are provided by Dial-A-Book Inc. solely for the personal use of visitors to this web site.

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