Guide to the National Electrical Code 1999

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

• ISBN13: 9780138621377
• ISBN10: 0138621373
• Additional ISBN(s): 9780130662286
• Format: Hardcover
• Copyright: 1998-12-01
• Publisher: Prentice Hall
• More Book Details

Summary

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.

Table of Contents

Preface to the 1999 Edition	vii	(2)
Preface to the First Edition	ix
1 Introduction	1	(12)
1-1. The Master Electrician and the Master Electrician's Examination	1	(4)
1-2. How to Use This Guide	5	(1)
1-3. The National Electrical Code	6	(1)
1-4. State and Local Codes and Ordinances	7	(6)
PART 1--WIRING DESIGN CALCULATIONS	13	(172)
2 Services, Feeders, and Branch Circuits	13	(23)
2-1. The Electrical System	13	(4)
2-2. Services	17	(6)
2-2.1 General Design Rules for Services
2-2.2 Sample Service Calculation
2-2.3 Three-Phase Services
2-3. Feeders	23	(7)
2-3.1 General Feeder Design Rules
2-3.2 Sample Feeder Calculation Using Demand Factors
2-4. Branch Circuits	30	(3)
2-4.1 General Branch--Circuit Design Rules
2-4.2 Branch--Circuit Calculation Techniques
2-5. Other Design Considerations	33	(3)
3 General Design Calculations	36	(79)
3-1. Branch-Circuit Load Calculations	37	(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	79	(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