Guide to the National Electrical Code 1999

, by Harman, Thomas L.; Allen, Charles E.

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ISBN: 9780138621377 | 0138621373
Cover: Hardcover
Copyright: 12/1/1998

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Updated to include all the changes required by the 1993 National Electrical Code, this guide explains the Code in detail with references to each specific Code artical. Covers services, feeders, and branch circuits; general design calculations; calculations for dwellings; circuit design for commercial and industrial occupancies; and more. For electrical inspectors, master electricians, journeyman electricians, electrical designers and engineers.

Preface to the 1999 Edition

vii

(2)

Preface to the First Edition

1 Introduction

(12)

1-1. The Master Electrician and the Master Electrician's Examination

(4)

1-2. How to Use This Guide

(1)

1-3. The National Electrical Code

(1)

1-4. State and Local Codes and Ordinances

(6)

PART 1--WIRING DESIGN CALCULATIONS

(172)

2 Services, Feeders, and Branch Circuits

(23)

2-1. The Electrical System

(4)

2-2. Services

(6)

2-2.1 General Design Rules for Services

2-2.2 Sample Service Calculation

2-2.3 Three-Phase Services

2-3. Feeders

(7)

2-3.1 General Feeder Design Rules

2-3.2 Sample Feeder Calculation Using Demand Factors

2-4. Branch Circuits

(3)

2-4.1 General Branch--Circuit Design Rules

2-4.2 Branch--Circuit Calculation Techniques

2-5. Other Design Considerations

(3)

3 General Design Calculations

(79)

3-1. Branch-Circuit Load Calculations

(42)

3-1.1 Lighting and Receptacle Branch Circuits

3-1.2 Motor Branch Circuits

3-1.3 Individual Appliance Branch Circuits

3-1.4 Branch Circuits for Space-Heating Equipment

3-1.5 Branch Circuits for Air-Conditioning Equipment

3-1.6 Mixed Loads on Branch Circuits

3-1.7 Branch-Circuit Design Summary

3-2. Feeder or Service Calculations

(36)

3-2.1 Feeders for Lighting and Receptacle Circuits

3-2.2 Feeders for Motor Circuits

3-2.3 Feeders for Appliances and Electric Space Heating

3-2.4 Feeder Design Summary

3-2.5 Special Feeder Problems

4 Calculations for Dwelling Type Occupancies

115

(40)

4-1. One-Family Dwelling and Individual Dwelling Units

116

(24)

4-1.1 Branch-Circuit Design for Dwellings

4-1.2 Standard Calculation for Computing Feeder or Service Loads for Dwelling Units

4-1.3 Optional Calculations for Computing Feeder or Service Loads

4-1.4 Optional Calculations for Additional Loads in Existing Dwelling Units

4-1.5 Complete Design Example for One-Family Dwellings

4-2. Multifamily Dwelling Calculations

140

(10)

4-2.1 Standard Calculation for Computing Feeder or Service Loads in Multifamily Dwellings

4-2.2 Optional Calculation for Multifamily Dwellings

4-2.3 Optional Calculation for Two-Family Dwellings

4-2.4 Complete Design Examples for Multifamily Dwellings

4-3. Special Multifamily Dwelling Problems

150

(5)

5 Electrical Circuit Design for Commercial and Industrial Occupancies

155

(30)

5-1. Typical Commercial Occupancy Calculations

156

(13)

5-1.1 Design Example for a Store with Show Window

5-1.2 Design Example for an Office Building

5-1.3 Design Example for an Office Building with Warehouse

5-2. Feeder and Service Design for Other Commercial Occupancies

169

(6)

5-2.1 Optional Calculations for Restaurants

5-2.2 Services for Hotels and Motels

5-2.3 Optional Calculations for Schools

5-2.4 Feeder and Service Calculations for Farms

5-3. Special Occupancies and Equipment

175

(10)

5-3.1 Service Calculation for a Small Hospital

5-3.2 Power Supply and Feeder Design for Mobile Homes and Mobile Home Parks

5-3.3 Power Supply and Feeder Design for Recreational Vehicles and Recreational Vehicle Parks

5-3.4 Shore Power Circuits for Marinas and Boatyards

5-3.5 Miscellaneous Wiring System Design Rules

PART II--GENERAL RULES FOR INSTALLATIONS

185

(130)

6 Installation Rules for Specific Circuits or Systems

185

(31)

6-1. Installation of Branch Circuits

185

(9)

6-1.1 General Installation Rules for Branch Circuits

6-1.2 Branch-Circuit Installation Rules for Dwelling Units

6-1.3 Branch-Circuit Installation Rules for Guest Rooms in Hotels and Motels

6-2. Installation Rules for Feeders

194

(1)

6-3. Installation Rules for Services

195

(16)

6-3.1 General Installation Rules for Services

6-3.2 Installation Rules for Service Disconnecting Means and Overcurrent Protection

6-3.3 Grounding and Bonding at Services

6-4. Systems Operating at Over 600 Volts

211

(1)

6-5. Miscellaneous Circuits and Systems

211

(5)

7 Installation of General Circuits and Equipment

216

(29)

7-1. Use of Conductors in Circuits

217

(5)

7-1.1 Overcurrent Protection of Conductors

7-1.2 Identification of Conductors

7-1.3 Size and Ampacity of Conductors

7-1.4 Properties of Conductors

7-1.5 Miscellaneous Types of Conductors

7-2. Installation and Protection of Conductors

222

(4)

7-2.1 General Rules for Conductor Installation

7-2.2 Conductors in Enclosures and Raceways

7-2.3 Underground Installations

7-3. Wiring Methods and Techniques

226

(6)

7-3.1 Wiring Methods Using Conductors and Cables

7-3.2 Wiring Methods Using Raceways

7-3.3 Other Wiring Methods and Techniques

7-4. Equipment Grounding and Bonding

232

(3)

7-4.1 Equipment Grounding

7-4.2 Equipment Bonding

7-5. Equipment and Devices

235

(10)

7-5.1 Overcurrent Devices

7-5.2 Boxes Containing Outlets, Receptacles, Switches, or Devices

7-5.3 Conduit Bodies, Pull Boxes, and Junction Boxes

7-5.4 Cabinets and Cutout Boxes, Switches, and Lighting Fixtures

8 Installation Rules for Distribution Equipment

245

(16)

8-1. Working Clearances

245

(3)

8-2. Switchboards and Panelboards

248

(3)

8-2.1 Switchboards

8-2.2 Panelboards

8-3. Transformers

251

(3)

8-4. Installation Rules for Capacitors and Other Distribution Equipment

254

(7)

8-4.1 Capacitors

8-4.2 Other Distribution Equipment

9 Installation of Utilization Equipment

261

(12)

9-1. Appliances

261

(3)

9-2. Fixed Electric Space-Heating Equipment

264

(3)

9-2.1 General Rules for Installation of Fixed Heating Equipment

9-2.2 Electric Space Heating Cables

9-2.3 Other Fixed Heating Equipment

9-3. Motors

267

(2)

9-3.1 Disconnecting Means

9-3.2 Guarding and Grounding

9-4. Miscellaneous Utilization Equipment

269

(4)

10 Special Equipment

273

(12)

10-1. Electric Signs

273

(3)

10-2. Data-Processing Systems

276

(1)

10-3. Swimming Pools

277

(4)

10-3.1 General Requirements for Pools

10-3.2 Requirements for Permanently Installed Pools

10-4. Miscellaneous Special Equipment

281

(4)

11 Special Occupancies

285

(18)

11-1. Hazardous (Classified) Locations

285

(9)

11-1.1 Class I Locations

11-1.2 Class II Locations

11-1.3 Class III Locations

11-1.4 Comparison of Classified Locations (Division 1)

11-2. Specific Class I Locations

294

(5)

11-2.1 Commercial Garages

11-2.2 Gasoline Dispensing and Service Stations

11-3. Other Special Occupancies

299

(4)

12 Special Conditions and Communication Circuits

303

(12)

12-1. Emergency and Standby Systems

303

(3)

12-1.1 Emergency Systems

12-1.2 Standby Systems

12-2. Remote-Control, Signaling and Power-Limited Circuits

306

(1)

12-3.1 Class 1 Circuits

12-3.2 Class 2 and Class 3 Circuits

12-3. Other Special Conditions

307

(1)

12-4. Communications Systems

307

(1)

12-5. Circuits and Equipment Operating at Over 600 Volts

308

(7)

PART III--GENERAL ELECTRICAL THEORY

315

(12)

13 Review of Electrical Theory

315

(12)

13-1. Direct-Current Theory

315

(1)

13-2. Conductors

316

(1)

13-3. Alternating-Current Theory

316

(3)

13-3.1 Inductors and Capacitors

13-3.2 Impedance

13-3.3 Power and Power Factor

13-3.4 Power Factor Correction

13-3.5 Energy

13-4. Equipment in AC Circuits

319

(8)

13-4.1 Loads

13-4.2 Voltage Drop in Conductors

13-4.3 Transformers

13-4.4 Motors

13-4.5 Electrical Diagrams

PART IV--FINAL EXAMINATIONS

327

(10)

Final Examination No. 1

327

(3)

Final Examination No. 2

330

(2)

Final Examination No. 3

332

(5)

APPENDICES

337

(47)

A. Important Formulas

337

(7)

B. Answers

344

(40)

Bibliography

384

(1)

Index

385

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Guide to the National Electrical Code 1999

Summary

Table of Contents

Supplemental Materials