Understanding the National Electrical Code

by Holt, Charles Michael; Holt, Michael Charles

• ISBN13: 9780766803503
• ISBN10: 0766803503
• Edition: 3rd
• Format: Paperback
• Copyright: 1999-01-20
• Publisher: Thomson Delmar Learning
• More Book Details
• Purchase Benefits

Summary

This book offers beginning and experienced electricians the ability to understand what the NEC® requires, and simplifies this sometimes intimidating and confusing code. Users learn how to read the code, and how to apply the rules immediately. Excellent examples and lots of illustrations and tables help readers understand the rules, and why they are necessary. Tips, cautions, warnings and an excellent glossary make this a must-have resource. Features: -newly revised to cover the 1999 NEC® code as it applies to electrical installations -excellent graphics, illustrations and explanations demystify the technical nature of the NEC®, and make it easy to understand and apply -lots of examples show how to apply the code rules immediately in order to design, install, and inspect safe electrical systems -plenty of tips, cautions and warnings that are handy to experienced and novice electricians alike ALSO AVAILABLE Student Workbook, ISBN: 0-7668-0351-1 INSTRUCTOR SUPPLEMENTS CALL CUSTOMER SUPPORT TO ORDER Instructor's Manual, ISBN: 0-7668-0352-X Computerized Testbank, ISBN: 0-8273-8611-7

Table of Contents

PREFACE	xxi
Introduction	xxi	(1)
How to Use This Book	xxi	(1)
Attitude and Gray Areas	xxii	(1)
Different Interpretations	xxii	(1)
About the Author	xxii	(1)
Acknowledgments	xxii
INTRODUCTION TO THE NATIONAL ELECTRICAL CODE	1	(10)
NEC Terms and Concepts	1	(1)
The NEC Style	2	(2)
How to Find Things in the Code	4	(1)
Customizing Your Code Book	4	(2)
UNIT 1 NEC INTRODUCTION	6	(5)
Objectives	6	(1)
National Electrical Code NFPA 70	6	(1)
Definitions and Glossary Terms	6	(1)
Article 90 Introduction	6	(1)
90-1 Purpose	6	(1)
90-2 Scope	7	(1)
90-3 Code Arrangement	8	(1)
90-4 Enforcement	8	(1)
90-5 Mandatory Rules and Explanatory Material	9	(1)
90-6 Formal Interpretations	10	(1)
90-7 Examination of Equipment for Product Safety	10	(1)
Summary	10	(1)
Review Questions	10	(1)
CHAPTER 1 GENERAL REQUIREMENTS	11	(26)
UNIT 2 Article 100 Definitions	13	(10)
Objectives	13	(1)
Part A. General	13	(9)
Summary	22	(1)
Review Questions	22	(1)
UNIT 3 Article 110 Requirements for Electrical Installations	23	(14)
Objectives	23	(1)
Definitions and Glossary Terms	23	(1)
Part A. GENERAL	23	(1)
110-2 Approval of Equipment	23	(1)
110-3 Examination, Identification, Installation, and Use of Equipment	24	(1)
110-4 Voltages	24	(1)
110-5 Copper Conductors	25	(1)
110-6 Conductor Sizes	25	(1)
110-7 Conductor Insulation	25	(1)
110-8 Wiring Methods	25	(1)
110-9 Interrupt Protection Rating	25	(1)
110-10 Short-Circuit Current Rating	25	(1)
110-10 Deteriorating Agents	26	(1)
110-12 Mechanical Execution of Work	26	(1)
110-13 Mounting and Cooling of Equipment	27	(1)
110-14 Electrical Conductor Termination	27	(3)
110-21 Manufacturer's Markings	30	(1)
110-22 Identification	30	(1)
Part B. 600 VOLT, NOMINAL OR LESS	30	(1)
110-26 Access and Working Space	30	(4)
110-27 Guarding	34	(1)
Summary	35	(1)
Review Questions	35	(2)
CHAPTER 2 WIRING AND PROTECTION	37	(137)
UNIT 4 Article 200 Use and Identification of Grounded Conductor	41	(6)
Objectives	41	(1)
Definitions and Glossary Terms	41	(1)
Grounded Conductor or Neutral Conductor?	41	(1)
Grounded Conductor	41	(1)
Neutral Conductor	42	(1)
Purpose of Grounded Conductor	42	(1)
200-1 Scope	43	(1)
200-3 Connection to Grounded System	43	(1)
200-6 Identification of the Grounded Conductor	43	(1)
200-7 Use of White or Natural Gray Conductor Finish for the Hot Wire	44	(1)
200-9 Terminal Identification	45	(1)
200-10 Identification of Terminals	45	(1)
200-11 Polarity	45	(1)
Summary	45	(1)
Review Questions	46	(1)
UNIT 5 Article 210 Branch Circuits	47	(24)
Objectives	47	(1)
Definitions and Glossary Terms	47	(1)
Part A. GENERAL PROVISIONS	47	(1)
210-1 Scope	47	(1)
210-2 Other Articles	48	(1)
210-3 Branch Circuit Rating	48	(1)
210-4 Multiwire Branch Circuits	48	(2)
210-5 Color Code for Branch Circuits	50	(1)
210-6 Branch Circuit Voltage Limitation	50	(1)
210-7 Receptacles	51	(1)
210-8 GFCI Protected Receptacles	52	(4)
Part B. BRANCH CIRCUIT RATINGS	56	(1)
210-11 Branch Circuit Requirements	56	(2)
210-12 Arc-fault Circuit Interrupter (AFCI) Protection	58	(1)
210-19 Conductor Sizing	58	(1)
210-20 Overcurrent Protection	59	(1)
210-21 Outlet Device Rating	60	(1)
210-23 Permissible Loads	60	(1)
210-24 Multiple Outlet Branch Circuit Summary	61	(1)
210-25 Common Area Branch Circuits	61	(1)
Part C. REQUIRED OUTLETS	61	(1)
210-50 General	61	(1)
210-52 Dwelling Unit Receptacle Outlet Requirements	62	(4)
Section 210-60 Receptacles in Guestroom for Hotels and Motels	66	(1)
210-63 Receptacles for Rooftop, Attic, and Crawl Spaces	66	(1)
210-70 Lighting Outlets Requirements	66	(2)
Summary	68	(1)
Review Questions	69	(2)
UNIT 6 Article 215 Feeders	71	(4)
Objectives	71	(1)
Definitions and Glossary Terms	71	(1)
215-1 Scope	71	(1)
215-2 Minimum Rating and Size	72	(1)
215-3 Overcurrent Protection	72	(1)
215-6 Feeder Conductor Grounding Means	73	(1)
215-8 Feeder High-Leg Conductor Identification	73	(1)
215-10 Ground-Fault Protection of Equipment	73	(1)
Summary	74	(1)
Review Questions	74	(1)
UNIT 7 Article 220 Branch Circuit, Feeder and Service Calculations	75	(14)
Objectives	75	(1)
Definitions and Glossary Terms	75	(1)
Part A. GENERAL	75	(1)
220-1 Scope	75	(1)
220-2 Voltages	75	(1)
220-3 Computation of Loads	76	(1)
Number of Receptacles on a Circuit	77	(1)
220-4 Maximum Loads	78	(1)
Part B. FEEDER AND SERVICE CALCULATIONS	79	(1)
220-11 General Lighting Demand Factors	79	(1)
220-12 Track Lighting	79	(1)
220-13 Commercial and Industrial Receptacle Demand Factors	80	(1)
220-14 Motors	80	(1)
220-15 Fixed Electric Space Heating	80	(1)
220-16 Dwelling Unit Small Appliance and Laundry Loads	80	(1)
220-17 Dwelling Unit Appliance Demand Factors	81	(1)
220-18 Dwelling Unit Electric Clothes Dryer Demand Factors	81	(1)
220-19 Dwelling Unit Electric Range Demand Factor	81	(1)
Branch Circuit Sizing, 220-19, Note 4	82	(2)
220-20 Commercial Kitchen Equipment Demand Factors	84	(1)
220-21 Noncoincident Loads	84	(1)
220-22 Feeder and Service Neutral Load	84	(2)
Part C. OPTIONAL CALCULATIONS FOR COMPUTING FEEDER AND SERVICE LOADS	86	(1)
220-30 Optional Calculation-Dwelling Unit	86	(1)
Summary	87	(1)
Review Questions	87	(2)
UNIT 8 Article 225 Outside Branch Circuits and Feeders	89	(9)
Objectives	89	(1)
Definitions and Glossary Terms	89	(1)
Part A. GENERAL REQUIREMENTS	89	(1)
225-1 Scope	89	(1)
225-2 Other Articles	90	(1)
225-4 Conductor Covering	90	(1)
225-6 Minimum Size Conductors	90	(1)
225-7 Lighting Equipment Installed Outdoors	90	(1)
225-10 Wiring on Buildings	90	(1)
225-16 Point of Attachment	91	(1)
225-18 Clearances	91	(1)
225-19 Clearances from Building	91	(1)
225-20 Mechanical Protection	92	(1)
225-22 Raceways Raintight and Arranged to Drain	92	(1)
225-26 Trees for Conductor Support	92	(1)
Part B. MORE THAN ONE BUILDING OR STRUCTURE	93	(1)
225-30 Number of Supplies	93	(1)
225-31 Disconnecting Means	93	(1)
225-32 Disconnect Location	93	(1)
225-33 Maximum Number of Disconnects	94	(1)
225-34 Grouping of Disconnects	94	(1)
225-35 Access to Occupants	94	(1)
225-36 Identified As Suitable for Service Equipment	94	(1)
225-37 Identification	95	(1)
225-38 Manual or Power-Operated Circuit Breakers	95	(1)
225-39 Rating of Disconnect	95	(1)
Summary	96	(1)
Review Questions	96	(2)
UNIT 9 Article 230 Services	98	(16)
Objectives	98	(1)
Definitions and Glossary Terms	98	(1)
Introduction	98	(1)
General Structure of Article 230 Services	99	(1)
Part A. GENERAL	99	(1)
230-1 Scope	99	(1)
230-2 Number of Services	99	(1)
230-3 One Building or Other Structure Not to Be Supplied through Another	100	(1)
230-6 Conductors Considered Outside a Building	100	(1)
230-7 Service Conductors Separate from Other Conductors	101	(1)
230-8 Raceway Seals	102	(1)
230-9 Clearance from Building Openings	102	(1)
Part B. OVERHEAD SERVICE-DROP CONDUCTORS	102	(1)
230-23 Size and Rating	102	(1)
230-24 Clearances	102	(1)
230-26 Point of Attachment	103	(1)
230-28 Service Masts Used As Supports	104	(1)
Part C. UNDERGROUND SERVICE LATERAL CONDUCTORS	104	(1)
230-31 Size and Rating	104	(1)
230-32 Underground Protection against Damage	104	(1)
Part D. SERVICE-ENTRANCE CONDUCTORS	105	(1)
230-40 Number of Service-Entrance Conductor Sets	105	(1)
230-42 Size and Rating	105	(1)
230-43 Wiring Methods Not Over 600 Volt Nominal	106	(1)
230-46 Splicing Service Entrance Conductors	106	(1)
230-50 Protection against Physical Damage-Aboveground	106	(1)
230-51 Service Cable Supports	106	(1)
230-53 Raceways Arranged to Drain	106	(1)
230-54 Connections at Service Head	107	(1)
230-56 High-Leg Identification	107	(1)
Part E. SERVICE EQUIPMENT--GENERAL	107	(1)
230-66 Identified As Suitable for Service Equipment	107	(1)
Part F. SERVICE EQUIPMENT--DISCONNECTING MEANS	107	(1)
230-70 General	107	(1)
230-71 Number of Disconnects	108	(1)
230-72 Grouping of Disconnects	109	(1)
230-75 Disconnecting of Grounded Conductor	109	(1)
230-76 Manual or Power-Operated Circuit Breakers	109	(1)
230-79 Rating of Disconnect	110	(1)
230-82 Equipment Connected to the Supply Side	110	(1)
Part E. SERVICE EQUIPMENT OVER-CURRENT PROTECTION	110	(1)
230-90 Overload Protection Required	110	(1)
230-91 Overcurrent Protection Device	111	(1)
230-92 Locked Service Overcurrent Devices	111	(1)
Summary	111	(1)
Review Questions	112	(2)
UNIT 10 Article 240 Overcurrent Protection	114	(17)
Objectives	114	(1)
Definitions and Glossary Terms	114	(1)
Part A. GENERAL	114	(1)
240-1 Scope	114	(1)
240-2 Protection of Equipment	115	(1)
240-3 Protection of Conductors	115	(2)
240-4 Protection of Flexible Cords and Fixture Wires	117	(1)
240-6 Standard Ampere Ratings	118	(1)
240-10 Supplementary Overcurrent Protection	118	(1)
240-11 Current-Limiting Devices	118	(1)
240-13 Ground Fault Protection of Equipment	118	(1)
Part B. LOCATION	118	(1)
240-20 Ungrounded Conductors	118	(1)
240-21 Location in Circuit	119	(2)
240-24 Location in Premises	121	(2)
Part C. ENCLOSURES	123	(1)
240-30 General	123	(1)
240-32 Damp or Wet Locations	123	(1)
240-33 Enclosure--Vertical Position	123	(1)
Part E. PLUG FUSES, FUSEHOLDERS, AND ADAPTERS	123	(1)
240-50 General	123	(1)
240-51 Edison Base Fuse	124	(1)
240-52 Edison Base Fuseholders	124	(1)
240-53 Type S Fuses	124	(1)
240-54 Type S Fuses, Adapters, and Fuseholders	124	(1)
Part F. CARTRIDGE FUSES AND FUSEHOLDERS	125	(1)
240-60 General	125	(1)
Part G. CIRCUIT BREAKERS	126	(1)
240-80 Method of Operation	126	(1)
240-81 Indicating	126	(1)
240-83 Markings	126	(1)
240-85 Use of Circuit Breakers	127	(1)
240-86 Series Rated Equipment	127	(1)
Summary	127	(1)
Review Questions	128	(3)
UNIT 11 Article 250 Grounding and Bonding	131	(22)
Objectives	131	(1)
Definitions and Glossary Terms	131	(1)
Introduction to Grounding	131	(1)
Purpose of Grounding	132	(1)
Electrical Shock Hazard	132	(1)
Fire Hazard	133	(1)
Part A. GENERAL	133	(1)
250-1 Scope	133	(1)
250-2 Grounding and Bonding Requirements	133	(3)
250-4 Other Code Sections	136	(1)
250-6 Objectionable Current Over Grounding Conductors	136	(1)
250-8 Grounding and Bonding Conductor Termination	137	(1)
250-10 Protection of Ground Clamps	137	(1)
250-12 Clean Surface	137	(1)
Part B. SYSTEM GROUNDING	137	(1)
250-20 System Circuit Grounding	137	(1)
250-24 Service System Grounding	137	(2)
250-30 Grounding Separately Derived Systems	139	(1)
250-32 Buildings or Structures Supplied by a Feeder or Branch Circuit	140	(2)
250-34 Generators-Portable and Vehicle-Mounted	142	(1)
Part C. GROUNDING ELECTRODE SYSTEM AND GROUNDING ELECTRODE CONDUCTORS	143	(1)
250-50 Grounding Electrode System	143	(3)
250-52 Made and Other Electrodes	146	(1)
250-54 Supplemental Grounding Electrodes	146	(1)
250-56 Resistance to Ground for Made Electrodes	147	(1)
250-58 Bonding Electrodes Together	147	(1)
250-60 Lightning Protection	148	(1)
250-62 Material	148	(1)
250-64 Installation	148	(1)
250-66 Grounding and Bonding Conductor Sizing (Line-Side)	149	(1)
250-68 Grounding Electrode Connection	149	(1)
250-70 Grounding Electrode Fitting	150	(1)
Summary	150	(1)
Review Questions	151	(2)
UNIT 12 Article 250 Grounding and Bonding	153	(21)
Objectives	153	(1)
Definitions and Glossary Terms	153	(1)
Part D. ENCLOSURE GROUNDING	153	(1)
250-80 Service Enclosures	153	(1)
250-86 Other Enclosures	154	(1)
Part E. BONDING	154	(1)
250-90 General	154	(1)
250-92 Bonding Service and Communications Systems	154	(1)
250-94 Bonding Service Enclosures and Raceways	155	(1)
250-96 Bonding Other Enclosures	156	(1)
250-97 Bonding Circuits Over 250 Volts to Ground	157	(1)
250-100 Hazardous (Classified) Locations Bonding	157	(1)
250-102 Equipment Bonding Jumpers	158	(1)
250-104 Bonding of Piping and Building Steel	159	(2)
250-106 Lightning Protection System	161	(1)
Part F. EQUIPMENT GROUNDING	162	(1)
250-110 When Grounding Required	162	(1)
250-118 Equipment Grounding Conductors	162	(1)
250-119 Identification of Grounding Conductor	163	(1)
250-120 Equipment Grounding Conductors Installation	164	(1)
250-122 Sizing Grounding and Bonding Conductors	164	(1)
Part G. METHODS OF EQUIPMENT GROUNDING	165	(1)
250-130 Equipment Grounding Conductor Connections	165	(1)
250-134 Fixed Equipment Grounding	166	(1)
250-136 Equipment Considered Effectively Grounded	166	(1)
250-140 Grounding of Ranges, Clothes Dryers, and Their Outlet Boxes	166	(1)
250-142 Neutral-to-Ground Connections	166	(1)
The Danger of Neutral-to-Ground Connections	167	(1)
250-146 Bonding--Receptacles	168	(1)
250-148 Equipment Grounding Conductors in Boxes	169	(2)
Summary	171	(1)
Review Questions	171	(3)
CHAPTER 3 WIRING METHODS AND MATERIALS	174	(123)
UNIT 13 Article 300 Wiring Methods	177	(22)
Objectives	177	(1)
Definitions and Glossary Terms	177	(1)
Part A. GENERAL REQUIREMENTS	177	(1)
300-1 Scope	177	(1)
300-2 Voltage and Temperature Limitations	178	(1)
300-3 Conductors	178	(1)
300-4 Protection against Physical Damage	179	(2)
300-5 Underground Installations	181	(3)
300-6 Protection against Corrosion	184	(1)
300-7 Raceways Exposed to Different Temperatures	184	(1)
300-8 Not Permitted in Raceways	185	(1)
300-10 Electrical Continuity	185	(1)
300-11 Securing and Supporting	185	(1)
300-12 Mechanical Continuity	186	(1)
300-13 Splices and Pigtails	187	(1)
Danger of Multiwire Branch Circuits	187	(2)
300-14 Length of Free Conductors	189	(1)
300-15 Boxes or Conduit Bodies Required	189	(1)
300-17 Number and Size of Conductors in Raceway	190	(1)
300-18 Inserting Conductors in Raceways	190	(1)
300-19 Supporting Conductors in Vertical Raceways	191	(1)
300-20 Induced Currents in Metal Parts	191	(1)
300-21 Spread of Fire or Products of Combustion	192	(1)
300-22 Ducts, Plenums, and Air Handling Spaces	193	(2)
300-23 Panels Designed to Allow Access	195	(1)
Summary	196	(1)
Review Questions	197	(2)
UNIT 14 Article 305 Temporary Wiring	199	(5)
Objectives	199	(1)
Definitions and Glossary Terms	199	(1)
305-1 Scope	199	(1)
305-2 Other Articles	199	(1)
305-3 Time Constraints	200	(1)
305-4 General	200	(1)
305-6 Ground-Fault Protection for Personnel	201	(2)
Summary	203	(1)
Review Questions	203	(1)
UNIT 15 Article 310 Conductors for General Wiring	204	(11)
Objectives	204	(1)
Definitions and Glossary Terms	204	(1)
310-1 Scope	204	(1)
310-2 Conductors	205	(1)
310-3 Stranded Conductors	205	(1)
310-4 Conductors in Parallel	205	(2)
310-5 Minimum Size Conductors	207	(1)
310-9 Corrosive Conditions	207	(1)
310-10 Insulation Temperature Limitation	207	(1)
310-12 Conductor Identification	208	(1)
310-13 Conductor Construction	208	(1)
310-15 Conductor Ampacity	209	(2)
Temperature and Bundling Adjustments	211	(2)
Summary	213	(1)
Review Questions	213	(2)
UNIT 16 Article 328 Flat Conductor Cable (Type FCC)	215	(3)
Objectives	215	(1)
Definitions and Glossary Terms	215	(1)
Part A. GENERAL	215	(1)
328-1 Scope	215	(1)
328-2 Definitions	215	(1)
328-4 Uses Permitted	216	(1)
328-5 Uses Not Permitted	216	(1)
328-6 Branch Circuit Ratings	216	(1)
Part B. INSTALLATION	216	(1)
328-10 Coverings	216	(1)
328-12 Shields	216	(1)
328-13 Enclosures and Shield Connections	216	(1)
328-14 Receptacles	216	(1)
328-16 Anchoring	216	(1)
328-17 Crossings	216	(1)
Summary	217	(1)
Review Questions	217	(1)
UNIT 17 Article 331 Electrical Nonmetallic Tubing (ENT)	218	(5)
Objectives	218	(1)
Definitions and Glossary Terms	218	(1)
Part A. GENERAL	218	(1)
331-1 Definition	218	(1)
331-3 Uses Permitted	218	(1)
331-4 Uses Not Permitted	219	(1)
Part B. INSTALLATION	220	(1)
331-5 Sizes	220	(1)
331-6 Number of Conductors	220	(1)
331-7 Trimming	220	(1)
331-8 Joints	220	(1)
331-9 Bends	220	(1)
331-10 Number of Bends (360(Degree))	220	(1)
331-11 Secured and Supported	221	(1)
331-14 Bushings	221	(1)
331-15 Construction Specifications	221	(1)
Summary	222	(1)
Review Questions	222	(1)
UNIT 18 Article 333 Armored Cable (Type AC)	223	(5)
Objectives	223	(1)
Definitions and Glossary Terms	223	(1)
333-1 Definition	223	(1)
333-3 Uses Permitted	224	(1)
333-4 Uses Not Permitted	224	(1)
333-7 Secured and Supported	224	(1)
333-8 Bends	225	(1)
333-9 Boxes and Fittings	225	(1)
333-10 Through or Parallel to Framing Members	225	(1)
333-11 Exposed Work	225	(1)
333-12 In Accessible Attics or Roof Spaces	225	(1)
333-20 Conductor Ampacities	226	(1)
333-21 Grounding	226	(1)
Summary	226	(1)
Review Questions	226	(2)
UNIT 19 Article 334 Metal-Clad Cable (Type MC)	228	(4)
Objectives	228	(1)
Part A. GENERAL	228	(1)
334-1 Definition	228	(1)
334-3 Uses Permitted	228	(1)
334-4 Uses Not Permitted	228	(1)
Part B. INSTALLATION	229	(1)
334-10 Installation Requirements	229	(1)
334-11 Bends	230	(1)
334-12 Fittings	230	(1)
334-13 Conductor Ampacity	230	(1)
Part C. CONSTRUCTION	230	(1)
334-23 Grounding	230	(1)
Summary	231	(1)
Review Questions	231	(1)
UNIT 20 Article 336 Nonmetallic-Sheath Cable (Types NM and NMC)	232	(5)
Objectives	232	(1)
Part A. GENERAL	232	(1)
336-2 Definition	232	(1)
336-4 Uses Permitted	232	(1)
336-5 Uses Not Permitted	233	(1)
Part B. INSTALLATION	233	(1)
336-6 Exposed	233	(1)
336-9 Through or Parallel to Framing Members	234	(1)
336-16 Bends	234	(1)
336-18 Secured or Supported	234	(1)
336-26 Ampacity	235	(1)
Summary	235	(1)
Review Questions	236	(1)
UNIT 21 Article 338 Service-Entrance Cable (Types SE and USE)	237	(2)
Objectives	237	(1)
338-1 Definition	237	(1)
338-2 Used for Services	237	(1)
338-3 Type SE Cable Used for Branch Circuits or Feeders	238	(1)
338-4 SE Used for Interior Wiring	238	(1)
Summary	238	(1)
Review Questions	238	(1)
UNIT 22 Article 339 Underground Feeder and Branch Circuit Cable (Type UF)	239	(2)
Objectives	239	(1)
339-1 Description	239	(1)
339-3 Uses	239	(1)
339-5 Ampacity	240	(1)
Summary	240	(1)
Review Questions	240	(1)
UNIT 23 Articles 345 and 346 Intermediate Metal Conduit and Rigid Metal Conduit	241	(4)
Objectives	241	(1)
Part A. GENERAL/INSTALLATION	241	(1)
345/346-3 Uses Permitted	241	(1)
Part B. INSTALLATION	242	(1)
345/346-5 Wet Locations	242	(1)
345/346-6 Size	242	(1)
345/346-7 Conductor Fill	242	(1)
345/346-8 Reaming	242	(1)
345/346-9 Couplings and Connectors	242	(1)
345/346-10 Bends	243	(1)
345/346-11 Number of Bends (360(Degree))	243	(1)
345/346-12 Secured and Supported	243	(1)
345/346-15 Bushings	244	(1)
Summary	244	(1)
Review Questions	244	(1)
UNIT 24 Article 347 Rigid Nonmetallic Conduit	245	(5)
Objectives	245	(1)
347-1 Description	245	(1)
Types of Rigid Nonmetallic Conduits	245	(1)
347-2 Uses Permitted	245	(1)
347-3 Uses Not Permitted	246	(1)
347-4 Grounding	246	(1)
347-5 Trimming	247	(1)
347-6 Joints	247	(1)
347-8 Secured and Supports	247	(1)
347-9 Expansion Fittings	247	(1)
347-10 Size	248	(1)
347-11 Number of Conductors	248	(1)
347-12 Bushings	248	(1)
347-13 Bends, How Made	248	(1)
347-14 Number of Bends (360(Degree))	248	(1)
Summary	249	(1)
Review Questions	249	(1)
UNIT 25 Article 348 Electrical Metallic Tubing	250	(3)
Objectives	250	(1)
348-4 Use	250	(1)
348-5 Uses Not Permitted	250	(1)
348-7 Size	251	(1)
348-8 Number of Conductors	251	(1)
348-9 Reaming	251	(1)
348-10 Coupling and Connectors	251	(1)
348-11 Bends	251	(1)
348-12 Number of Bends (360(Degree))	251	(1)
348-13 Secured and Supports	251	(1)
Summary	252	(1)
Review Questions	252	(1)
UNIT 26 Article 350 Flexible Metal Conduit	253	(4)
Objectives	253	(1)
350-2 Definition	253	(1)
350-4 Uses	253	(1)
350-5 Uses Not Permitted	253	(1)
350-10 Size	254	(1)
350-12 Number of Conductors	254	(1)
350-14 Grounding	254	(1)
350-16 Bends	255	(1)
350-18 Secured and Supports	255	(1)
350-20 Fittings	255	(1)
350-22 Trimming	256	(1)
Summary	256	(1)
Review Questions	256	(1)
UNIT 27 Article 351 Liquidtight Flexible Metal Conduit and Liquidtight Flexible Nonmetallic Conduit	257	(4)
Objectives	257	(1)
Part A. LIQUIDTIGHT FLEXIBLE METAL CONDUIT	257	(1)
351-2 Definition	257	(1)
351-4 Use	257	(1)
351-5 Size	258	(1)
351-6 Number of Conductors	258	(1)
351-7 Fittings	258	(1)
351-8 Secured and Supports	258	(1)
351-9 Grounding	258	(1)
351-10 Bends and Fittings	259	(1)
Part B. LIQUIDTIGHT FLEXIBLE NONMETALLIC CONDUIT	259	(1)
351-23 Use	259	(1)
351-27 Secured and Support	259	(1)
Summary	259	(1)
Review Questions	260	(1)
UNIT 28 Article 352 Surface Raceways--Metallic or Nonmetallic	261	(4)
Objectives	261	(1)
Part A. SURFACE METAL RACEWAYS	262	(1)
352-1 Uses	262	(1)
352-3 Size of Conductors	262	(1)
352-4 Number of Conductors	262	(1)
352-5 Through Walls and Floors	262	(1)
352-6 Separate Compartments	262	(1)
352-7 Splices and Taps	263	(1)
352-9 Grounding	263	(1)
Part B. SURFACE NONMETALLIC RACEWAYS	263	(1)
352-21 Description	263	(1)
352-22 Use	263	(1)
Part C. STRUT-TYPE CHANNEL RACEWAY	263	(1)
352-41 Uses Permitted	263	(1)
352-42 Uses Not Permitted	264	(1)
352-45 Number of Conductors Permitted	264	(1)
Summary	264	(1)
Review Questions	264	(1)
UNIT 29 Article 353 Multioutlet Assembly	265	(2)
Objective	265	(1)
353-2 Uses	265	(1)
353-3 Through Partitions	266	(1)
Summary	266	(1)
Review Question	266	(1)
UNIT 30 Article 362 Wireways--Metallic or Nonmetallic	267	(3)
Objectives	267	(1)
Part A. METALLIC WIREWAYS	267	(1)
362-1 Definition	267	(1)
362-2 Uses	267	(1)
362-4 Conductor--Maximum Size	268	(1)
362-5 Conductor--Maximum Number	268	(1)
362-6 Wireway Sizing	268	(1)
362-7 Splices and Taps	268	(1)
362-8 Supports	269	(1)
362-11 Extensions from Wireways	269	(1)
Part B. NONMETALLIC WIREWAYS	269	(1)
Summary	269	(1)
Review Questions	269	(1)
UNIT 31 Article 370 Outlet, Device, Pull and Junction Boxes, Conduit Bodies, and Fittings	270	(11)
Objectives	270	(1)
Part A. SCOPE AND GENERAL	270	(1)
370-1 Scope	270	(1)
370-3 Nonmetallic Boxes	270	(1)
370-4 Metal Boxes	270	(1)
370-5 Short Radius Conduit Bodies	271	(1)
Part B. INSTALLATION	271	(1)
370-15 Damp, Wet, or Hazardous (Classified) Locations	271	(1)
370-16 Number of Conductors in Boxes and Conduit Bodies	271	(3)
370-17 Conductors Entering Boxes or Conduit Bodies	274	(1)
370-18 Unused Openings	274	(1)
370-20 Boxes Installed in Walls or Ceilings	275	(1)
370-21 Gaps or Spaces around Boxes	275	(1)
370-22 Surface Extensions	275	(1)
370-23 Supports of Boxes and Conduit Bodies	275	(2)
370-25 Covers and Canopies	277	(1)
370-27 Outlet Boxes	277	(1)
370-28 Pull, Junction Boxes, and Conduit Bodies for Conductors No. 4 and Larger	278	(1)
370-29 Wiring to Be Accessible	279	(1)
Summary	279	(1)
Review Questions	280	(1)
UNIT 32 Article 373 Cabinets and Cutout Boxes	281	(3)
Objectives	281	(1)
373-1 Scope	281	(1)
373-2 Damp, Wet, or Hazardous (Classified) Locations	281	(1)
373-3 Installed in Walls	281	(1)
373-4 Unused Openings	282	(1)
373-5 Cables	282	(1)
373-8 Used for Raceway and Splices	282	(1)
Summary	283	(1)
Review Question	283	(1)
UNIT 33 Article 374 Auxiliary Gutters	284	(2)
Objective	284	(1)
374-1 Uses	284	(1)
374-2 Length	284	(1)
374-3 Supports	284	(1)
374-4 Covers	284	(1)
374-5 Number of Conductors	284	(1)
374-6 Ampacity	285	(1)
374-8 Splices and Taps	285	(1)
374-9 Gutter Sizing	285	(1)
Summary	285	(1)
Review Question	285	(1)
UNIT 34 Article 380 Switches	286	(6)
Objectives	286	(1)
Part A. INSTALLATION	286	(1)
380-1 Scope	286	(1)
380-2 Switch Connections	286	(1)
380-3 Switch Enclosures	287	(1)
380-4 Wet Locations	287	(1)
380-6 Position of Knife Switches	288	(1)
380-7 Indicating	288	(1)
380-8 Accessibility and Grouping	288	(1)
380-9 Snap Switch Faceplates	289	(1)
380-10 Mounting Snap Switches	290	(1)
380-11 Circuit Breakers Used As Switches	290	(1)
380-12 Grounding	290	(1)
380-14 Rating and Use of Snap Switches	290	(1)
Summary	291	(1)
Review Questions	291	(1)
UNIT 35 Article 384 Switchboards and Panelboards	292	(5)
Objectives	292	(1)
384-1 Scope	292	(1)
384-3 Arrangement of Busbars and Conductors	292	(1)
384-4 Working Clearance and Dedicated Space	293	(1)
Part C. PANELBOARDS	293	(1)
384-13 Circuit Identification	293	(1)
384-14 Lighting and Appliance Branch Circuit Panelboard	293	(1)
384-15 Number of Overcurrent Devices	293	(1)
384-16 Overcurrent Protection of Panelboard	294	(1)
384-20 Grounding of Panelboards	295	(1)
Summary	296	(1)
Review Questions	296	(1)
CHAPTER 4 EQUIPMENT	297	(58)
UNIT 36 Article 400 Flexible Cords and Cables	299	(4)
Objectives	299	(1)
400-1 Scope	299	(1)
400-3 Suitability	299	(1)
400-4 Types	299	(1)
400-5 Ampacity of Flexible Cords and Cables	299	(1)
400-7 Uses Permitted	300	(1)
400-8 Uses Not Permitted	300	(1)
400-10 Pull at Joints and Terminals	301	(1)
400-13 Overcurrent Protection	301	(1)
Summary	301	(1)
Review Questions	302	(1)
UNIT 37 Article 402 Fixture Wires	303	(3)
Objectives	303	(1)
402-1 Scope	303	(1)
402-3 Types	303	(1)
402-5 Allowable Ampacity of Fixture Wires	303	(1)
402-6 Minimum Size	303	(1)
402-7 Number of Conductors in Conduit or Tubing	304	(1)
402-8 Grounded Conductor	304	(1)
402-10 Uses Permitted	304	(1)
402-11 Uses Not Permitted	304	(1)
402-12 Overcurrent Protection	304	(1)
Summary	305	(1)
Review Question	305	(1)
UNIT 38 Article 410 Lighting Fixtures, Lampholders, Lamps, and Receptacles	306	(14)
Objectives	306	(1)
Part A. GENERAL	306	(1)
410-1 Scope	306	(1)
Part B. FIXTURE LOCATIONS	307	(1)
410-4 Specific Locations	307	(1)
410-8 Clothes Closets	308	(2)
Part C. FIXTURE OUTLET BOXES AND COVERS	310	(1)
410-12 Outlet Box to Be Covered	310	(1)
410-14 Connection of Electric Discharge Lighting Fixtures	310	(1)
Part D. FIXTURE SUPPORTS	310	(1)
410-15 Metal Poles	310	(1)
410-16 Support	311	(1)
Part F. WIRING OF FIXTURES	312	(1)
410-23 Polarization of Fixtures	312	(1)
410-30 Cord-Connected Lighting Fixtures	312	(1)
410-31 Fixtures Used As Raceway	312	(1)
Part H. LAMPHOLDERS	313	(1)
410-47 Receptacle Adapter	313	(1)
Part L. RECEPTACLES	313	(1)
410-56 Receptacle Installation	313	(2)
410-57 Receptacles in Damp or Wet Locations	315	(1)
Part M. RECESSED FIXTURES	315	(1)
410-65 Thermally Protected	315	(1)
410-66 Recessed Fixture Clearances	316	(1)
410-67 Wiring	316	(1)
Part P. ELECTRIC-DISCHARGE LIGHTING (1,000 VOLT OR LESS)	316	(1)
410-73 General	316	(1)
410-76 Fixture Mounting	317	(1)
Part Q. ELECTRIC DISCHARGE LIGHTING MORE THAN 1,000 VOLTS	317	(1)
410-80 General	317	(1)
Part R. TRACK LIGHTING	317	(1)
410-100 Definition	317	(1)
410-101 Installation	317	(1)
410-104 Fastening	318	(1)
Summary	318	(1)
Review Questions	319	(1)
UNIT 39 Article 422 Appliances	320	(6)
Objectives	320	(1)
Part A. GENERAL	320	(1)
422-1 Scope	320	(1)
422-3 Other Articles	320	(1)
Part B. BRANCH CIRCUIT REQUIREMENTS	321	(1)
422-10 Branch Circuit Sizing	321	(1)
422-11 Overcurrent Protection	321	(1)
422-12 Central Heating Equipment	321	(1)
422-13 Water Heaters	322	(1)
422-15 Central Vacuum	322	(1)
422-16 Flexible Cords	322	(1)
422-18 Paddle Fans	323	(1)
Part C. DISCONNECT	323	(1)
422-30 Disconnecting Means	323	(1)
422-31 Permanently Connected Appliance Disconnect	323	(1)
422-32 Cord- and Plug-Connected Appliance Disconnect	324	(1)
422-33 Unit Switch As Disconnect	324	(1)
Summary	325	(1)
Review Questions	325	(1)
UNIT 40 Article 424 Fixed Electric Space Heating Equipment	326	(3)
Objectives	326	(1)
Part A. GENERAL	326	(1)
424-1 Scope	326	(1)
424-3 Branch Circuits	326	(1)
424-9 Baseboard Heaters	327	(1)
Part C. ELECTRIC SPACE HEATING EQUIPMENT	327	(1)
424-19 Disconnecting Means	327	(1)
Part F. DUCT HEATERS	328	(1)
424-65 Disconnect for Electric Duct Heater Controller	328	(1)
Summary	328	(1)
Review Questions	328	(1)
UNIT 41 Article 430 Motors, Motor Circuits, and Controllers	329	(16)
Objectives	329	(1)
Part A. GENERAL	329	(1)
430-1 Scope	329	(1)
430-2 Adjustable Speed Drive Systems	329	(1)
430-6 Conductor Sizing	330	(1)
430-9 Motor Controllers Terminal Requirements	330	(1)
430-14 Location of Motors	330	(1)
430-17 The Highest Rated Motors	330	(1)
Part B. CONDUCTOR SIZE	330	(1)
430-22 Single Motor Conductor Size	330	(1)
430-24 Feeder Conductor Size	331	(1)
430-26 Diversity and Balancing	331	(1)
430-28 Motor Tap Conductors	331	(1)
Part C. OVERLOAD PROTECTION	332	(1)
430-31 Overload Purpose	332	(1)
430-32 Overload Sizing	333	(1)
430-36 Fuses for Overcurrent Protection	333	(1)
430-37 Number of Overload Devices	333	(1)
430-42 Cord- and Plug-Connected Motors	333	(1)
430-43 Automatic Restarting	333	(1)
430-44 Overload Alarm	334	(1)
Part D. BRANCH CIRCUIT SHORT-CIRCUIT AND GROUND-FAULT PROTECTION	334	(1)
430-51 General	334	(1)
430-52 Branch Circuit Short-Circuit and Ground-Fault Protection	334	(1)
430-55 Single Protective Device	335	(1)
Part E. FEEDER SHORT-CIRCUIT AND GROUND-FAULT PROTECTION	336	(1)
430-62 Feeder Protection	336	(1)
430-63 Feeder Protection for Motors and Other Loads	336	(1)
Part F. MOTOR CONTROL CIRCUITS	336	(1)
430-71 Definition of Motor Control Circuit	336	(1)
430-72 Overcurrent Protection for Control Circuits	337	(1)
430-73 Protection from Physical Damage	338	(1)
430-74 Disconnect for Control Circuit	338	(1)
Part G. MOTOR CONTROLLERS	339	(1)
430-81 General	339	(1)
430-82 Controller Design	339	(1)
430-83 Controller Rating	339	(1)
430-84 Open All Conductors	339	(1)
430-87 Controller for Each Motor	339	(1)
430-91 Motor Controller Enclosure Types	340	(1)
Part J. DISCONNECTING MEANS	340	(1)
430-101 General	340	(1)
430-102 Disconnect Requirement	340	(1)
430-103 Open All Supply Conductors	341	(1)
430-104 Marking and Mounting	341	(1)
430-107 One Disconnect Must Be Readily Accessible	341	(1)
430-109 Disconnect Rating	341	(1)
430-111 Combination Controller-Disconnect	342	(1)
Table 430-148 Full-Load Current, Single-Phase Motors	342	(1)
Table 430-150 Full-Load Current, Three-Phase Motors	342	(1)
Table 430-151 Locked Rotor Currents	342	(1)
Table 430-152 Branch Circuit Short-Circuit and Ground-Fault Protection Size	342	(1)
Summary	342	(1)
Review Questions	343	(2)
UNIT 42 Article 440 Air-Conditioning and Refrigeration Equipment	345	(5)
Objectives	345	(1)
Part A. GENERAL	345	(1)
440-1 Scope	345	(1)
440-3 Other Articles	345	(1)
Part B. DISCONNECTING MEANS	346	(1)
440-13 Cord-and Plug-Connected Equipment	346	(1)
440-14 Location	346	(1)
Part C. CIRCUIT PROTECTION	346	(1)
440-21 General	346	(1)
440-22 Short-Circuit and Ground Fault Protection Device Size	346	(1)
Part D. CONDUCTOR SIZING	347	(1)
440-32 Conductor Size--One Motor Compressor	347	(1)
440-33 Conductor Size--Several Motor Compressors	347	(1)
440-34 Conductor Size--Motor Compressor(s) with Other Loads	348	(1)
Part G. ROOM AIR-CONDITIONERS	348	(1)
440-60 General	348	(1)
440-62 Branch Circuit Requirements	348	(1)
440-63 Disconnecting Means	348	(1)
440-64 Supply Cord	348	(1)
Summary	348	(1)
Review Questions	349	(1)
UNIT 43 Article 450 Transformers	350	(5)
Objectives	350	(1)
450-1 Scope	350	(1)
450-3 Overcurrent Protection	350	(2)
450-9 Ventilation	352	(1)
450-13 Transformer Accessibility	352	(1)
Summary	353	(1)
Review Questions	353	(2)
Glossary	355	(8)
Index	363