Electrical Wiring Commercial

by Mullin,Ray C

• ISBN13: 9780766833425
• ISBN10: 0766833429
• Format: Paperback
• Copyright: 2001-12-07
• Publisher: Cengage Learning

Summary

Part of our best-selling wiring series, Electrical Wiring - Commercial provides readers with all of the information and hands-on experience needed to "meet Code" when wiring a light commercial building, including a complete set of full-size, ready-to-use plans. Used by thousands of apprentices to prepare for and successfully pass journeyman exams, this edition has been thoroughly updated based on current 2002 NEC? requirements. Metrification and adoption of the new Code numbering system is just the beginning! This edition has also been significantly expanded and now features an introduction to cube fuse, plus all-new information on IC luminaries as well as Transient Voltage Surge Suppressor and Uninterruptible Power Supply. Comprehensive in scope, the book enables readers to gain expertise in identifying, interpreting, and applying applicable Code rules as they proceed, room by room, through the wiring of an insurance office, doctor's office, bakery, beauty salon, and basement with an electric boiler. Hundreds of examples, sample calculations, wiring diagrams, illustrations and photos are included to guide them, step-by-step, through wiring sizing, load calculations, conduit fill computations, selecting overcurrent protection, and more!

Table of Contents

Preface	xvii
Commercial Building Plans and Specifications	1	(21)
Objectives	1	(1)
Safety in the Workplace	1	(1)
Commercial Building Specifications	2	(3)
Working Drawings	5	(6)
Codes and Organizations	11	(4)
Metrics (SI) and the NEC®	15	(4)
Review Questions	19	(3)
Reading Electrical Working Drawings---Entry Level	22	(6)
Objectives	22	(1)
Electrical Symbols	22	(3)
The Drugstore	25	(1)
The Bakery	25	(1)
Review Questions	26	(2)
Computing the Electrical Load	28	(7)
Objectives	28	(1)
The Electrical Load	28	(1)
Lighting Loading Calculations	28	(3)
Other Loads	31	(1)
Motors and Appliances	31	(1)
Summary of Drugstore Loads	32	(1)
Review Questions	33	(2)
Branch-Circuits	35	(15)
Objectives	35	(1)
Conductor Selection	35	(5)
Determining Circuit Components	40	(3)
Defining the Branch-Circuits	43	(2)
Using the Panelboard Worksheet, Columns A-E	45	(1)
Using the Panelboard Worksheet, Columns F-K	46	(2)
Using the Panelboard Worksheet, Columns L-S	48	(1)
Review Questions	49	(1)
Switches and Receptacles	50	(20)
Objectives	50	(1)
Receptacles	50	(7)
Snap Switches	57	(5)
Conductor Color Coding	62	(2)
Switch and Receptacle Covers	64	(1)
Review Questions	64	(6)
Branch-Circuit Installation	70	(24)
Objectives	70	(1)
Rigid Metal Conduit (RMC)	70	(1)
Intermediate Metal Conduit (IMC)	71	(1)
Electrical Metallic Tubing	71	(2)
Flexible Connections	73	(3)
Armored (Type AC) and Metal-Clad (Type MC) Cables	76	(1)
Rigid Nonmetallic Conduit (RNC)	77	(1)
Electrical Nonmetallic Tubing (ENT)	78	(1)
Raceway Sizing	78	(2)
Special Considerations	80	(1)
Box Styles and Sizing	80	(2)
Selecting the Correct Size Box	82	(6)
Raceway Support	88	(2)
Review Questions	90	(4)
Motor and Appliance Circuits	94	(19)
Objectives	94	(1)
Appliances	94	(2)
The Basics of Motor Circuits	96	(8)
Equipment Installation	104	(2)
Disconnecting Means	106	(1)
Grounding	106	(1)
Overcurrent Protection	107	(1)
The Bakery Equipment	107	(3)
Review Questions	110	(3)
Feeders	113	(14)
Objectives	113	(1)
Feeder Requirements	113	(2)
Feeder Component Selection	115	(4)
Voltage Drop	119	(2)
Panelboard Worksheet Summary	121	(1)
Feeder Determination, Drugstore	122	(2)
Review Questions	124	(3)
Special Systems	127	(11)
Objectives	127	(1)
Surface Metal Raceways	127	(2)
Multioutlet Assemblies	129	(2)
Communications Systems	131	(1)
Floor Outlets	131	(6)
Review Questions	137	(1)
Working Drawings---Upper Level	138	(7)
Objectives	138	(1)
Insurance Office	138	(1)
Beauty Salon	139	(2)
Doctor's Office	141	(2)
Review Questions	143	(2)
Special Circuits (Owner's Circuits)	145	(8)
Objectives	145	(1)
Loading Schedule	145	(1)
Lighting Circuits	145	(1)
Sump Pump Control	146	(1)
Boiler Control	147	(4)
Review Questions	151	(2)
Panelboard Selection and Installation	153	(11)
Objectives	153	(1)
Panelboards	153	(5)
Working Space Around Electrical Equipment	158	(4)
Summary	162	(1)
Review Questions	162	(2)
The Electric Service	164	(29)
Objectives	164	(1)
Transformers	164	(1)
Transformer Overcurrent Protection	165	(1)
Transformer Connections	165	(5)
The Service Entrance	170	(1)
Metering	171	(3)
Service-Entrance Equipment	174	(4)
Grounding	178	(8)
Ground-Fault Protection	186	(2)
Safety in the Workplace	188	(2)
Review Questions	190	(3)
Lamps for Lighting	193	(15)
Objectives	193	(1)
Lighting Terminology	193	(1)
Incandescent Lamps	194	(3)
Low-Voltage Incandescent Lamps	197	(1)
Fluorescent Lamps	198	(6)
High-Intensity Discharge (HID) Lamps	204	(2)
Review Questions	206	(2)
Luminaires (Fixtures)	208	(20)
Objectives	208	(1)
Definitions	208	(1)
Installation	208	(4)
Labeling	212	(4)
Loading Allowance Computations	216	(1)
Commercial Building Luminaires (Fixtures)	217	(5)
Luminaires (Fixtures) in Clothes Closets	222	(1)
Watts Per Unit Area Calculations	223	(2)
Review Questions	225	(3)
Emergency, Legally Required Standby, and Optional Standby Power Systems	228	(11)
Objectives	228	(1)
Sources of Power	228	(1)
Special Service Arrangements	228	(2)
Emergency Generator Source	230	(7)
Review Questions	237	(2)
Overcurrent Protection: Fuses and Circuit Breakers	239	(33)
Objectives	239	(1)
Disconnect Switches	240	(1)
Fuses and Circuit Breakers	240	(3)
Types of Fuses	243	(9)
Testing Fuses	252	(2)
Delta, Three-Phase, Corner Grounded ``B'' Phase System	254	(2)
Time-Current Characteristic Curves and Peak Let-Through Charts	256	(4)
Circuit Breakers	260	(5)
Series-Rated Equipment	265	(1)
Series-Rated Systems Where Electric Motors Are Connected	266	(1)
Current-Limiting Breakers	267	(1)
Cost Considerations	267	(1)
Motor Circuits	267	(1)
Heating, Air Conditioning, and Refrigeration (HACR) Circuit Breakers	268	(1)
Review Questions	269	(3)
Short-Circuit Calculations and Coordination of Overcurrent Protective Devices	272	(17)
Objectives	272	(1)
Short-Circuit Calculations	273	(6)
Short-Circuit Current Variables	279	(2)
Coordination of Overcurrent Protective Devices	281	(5)
Single Phasing	286	(1)
Review Questions	286	(3)
Equipment and Conductor Short-Circuit Protection	289	(14)
Objectives	289	(1)
Conductor Withstand Rating	290	(4)
Conductor Heating	294	(1)
Calculating an Insulated (167°F [75°C] Thermoplastic) Conductor's Short-Time Withstand Rating	294	(2)
Calculating a Bare Copper Conductor and/or Its Bolted Short-Circuit Withstand Rating	296	(1)
Calculating the Melting Point of a Copper Conductor	296	(1)
Using Charts to Determine a Conductor's Short-Time Withstand Rating	297	(1)
Magnetic Forces	298	(2)
Tap Conductors	300	(1)
Review Questions	301	(2)
Low-Voltage Remote-Control	303	(7)
Objectives	303	(1)
Low-Voltage Remote-Control	303	(3)
Wiring Methods	306	(2)
Review Questions	308	(2)
The Cooling System	310	(15)
Objectives	310	(1)
Refrigeration	310	(1)
Evaporator	311	(1)
Compressor	312	(1)
Condenser	312	(1)
Expansion Valve	312	(1)
Hermetic Compressors	313	(1)
Cooling System Control	314	(2)
Cooling System Installation	316	(1)
Electrical Requirements for Air-Conditioning and Refrigeration Equipment	316	(1)
Special Terminology	317	(7)
Review Questions	324	(1)
APPENDIX	325	(34)
Electrical Specifications	325	(3)
Heating and Air-Conditioning Specifications	328	(1)
Plumbing Specifications	329	(1)
How to Use Tables A-2 and A-3 to Calculate Voltage Loss	330	(1)
How to Use Tables A-2 and A-3 to Select Conductor Size	330	(21)
Metric System of Measurement	351	(8)
Glossary	359	(10)
Web Sites	369	(10)
Code Reference Index	379	(4)
Index	383