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Summary
Summary
Publisher's Note: Products purchased from Third Party sellers are not guaranteed by the publisher for quality, authenticity, or access to any online entitlements included with the product.
THE ULTIMATE ON-THE-JOB COMPANION--FULLY UPDATED
Thoroughly revised to reflect the 2011 National Electrical Code (NEC) and the latest industry advances, Electrician's Calculations Manual , Second Edition gives you quick access to the basic calculations needed for any given job. The book also serves as an ideal review for license preparation. End-of-chapter questions plus an end-of-book final test help reinforce the material covered. Written by a Master Electrician with more than 40 years of experience, this practical guide helps you:
Find answers for both AC and DC circuits Solve problems related to motor circuits and transformers Calculate single-dwelling and multifamily loads Accurately figure requirements for commercial jobs Perform conduit-bending math Handle service entrance problems Understand the math behind electrical solutions And much moreAuthor Notes
Nick Fowler has been a practicing electrician for more than 40 years. He holds several state and Master Electrician licenses, and has been an electrical journeyman, foreman, and general foreman. Mr. Fowler is a member of International Brotherhood of Electrical Workers Local 191, Everett, Washington. He has worked on a large number of projects, ranging from large semiconductor chip plants, petrochemical refineries, large office buildings, and research facilities containing complex electrical systems, such as fire alarm, security, motor control, and HVAC control systems.
Table of Contents
Preface | p. ix |
ElectricityùAn Overview | p. 1 |
1 Direct Current Calculations | p. 5 |
1-1 Ohm's Law | p. 5 |
1-2 Series Circuits | p. 8 |
1-3 Parallel Circuits | p. 11 |
1-4 Combination Circuits | p. 15 |
Chapter 1 Test | p. 22 |
2 Alternating Current Calculations | p. 25 |
2-1 Single Phase | p. 25 |
2-2 Three-Phase Power | p. 29 |
2-3 Power Factor | p. 32 |
2-4 Voltage Drop | p. 39 |
2-5 Combining Loads, Single Phase and Three Phase | p. 42 |
Chapter 2 Test | p. 42 |
3 Transformers | p. 45 |
3-1 Transformer Basics | p. 45 |
3-2 Delta and Wye Characteristics | p. 48 |
3-3 Delta Connection | p. 49 |
3-4 Wye Connection | p. 49 |
3-5 Grounded Delta | p. 51 |
3-6 Open Delta | p. 53 |
3-7 Motor Control Transformer | p. 53 |
3-8 Series and Parallel Windings | p. 55 |
3-9 Transformer Polarity | p. 56 |
3-10 Buck and Boost Transformers | p. 57 |
Chapter 3 Test | p. 58 |
4 Miscellaneous Calculations | p. 61 |
4-1 Conduit SizeùTwo or More Conductors of the Same Size | p. 61 |
4-2 Different-Size Conductors | p. 62 |
4-3 Sizing Junction Boxes for #6 and Smaller Conductors | p. 64 |
4-4 Junction Boxes for #4 and Larger Conductors | p. 66 |
4-5 Over 600 Volts | p. 67 |
4-6 Shielded Cable | p. 67 |
4-7 Grounding Electrode Conductor | p. 70 |
4-8 Equipment Grounding Conductor | p. 71 |
4-9 Sizing Neutral Conductors | p. 72 |
Open Neutral | p. 75 |
4-10 Overcurrent Protection | p. 76 |
Air Conditioning and Refrigeration Equipment | p. 77 |
Welders | p. 77 |
Transformers | p. 79 |
4-11 Phase Identification | p. 81 |
Tape Measure Method | p. 82 |
Chapter 4 Test | p. 83 |
5 Motors | p. 87 |
5-1 Introduction | p. 87 |
5-2 Branch Circuit Conductors | p. 88 |
5-3 Running Overload Protection | p. 89 |
5-4 Branch Circuit Short Circuit and Ground-Fault Protection | p. 91 |
5-5 Control Circuits | p. 92 |
5-6 Controllers | p. 95 |
5-7 Disconnecting Means | p. 95 |
5-8 Fire Pumps, Controllers, and Motors | p. 97 |
5-9 Common Motor Connections | p. 98 |
Three-Lead Three-Phase Motors | p. 98 |
Six-Lead and 12-Lead Motors | p. 98 |
Nine-Lead Motors | p. 99 |
Two-Speed Motors | p. 99 |
5-10 Load Classification | p. 100 |
Chapter5 Test | p. 100 |
6 Single-Dwelling Load Calculations | p. 103 |
l6-1 General Lighting and Receptacles | p. 103 |
6-2 Ovens and Cooktops | p. 104 |
6-3 Heating and Air Conditioning | p. 105 |
6-4 Electric Clothes Dryer | p. 106 |
6-5 Fixed Appliances | p. 106 |
6-6 Load Calculation for a Single-Family Dwelling | p. 106 |
6-7 Addition to Existing Dwelling | p. 108 |
6-8 Optional Calculation for Single-Family Dwelling | p. 110 |
6-9 Optional Calculation for a Two-Dwelling Unit | p. 114 |
Chapter 6 Test | p. 116 |
7 Multifamily Load Calculations | p. 119 |
7-1 Standard Calculations | p. 119 |
7-2 Ovens of Unequal Rating | p. 122 |
7-3 House Loads for Multifamily Dwellings | p. 123 |
7-4 Optional Calculation for Multifamily Dwelling | p. 125 |
7-5 Laundry in Each Unit | p. 130 |
7-6 Optional Calculation without Electric Cooking Equipment | p. 133 |
Chapter 7 Test | p. 135 |
8 Commercial Calculations | p. 137 |
8-1 General | p. 137 |
8-2 Single-Phase Small Commercial Calculation | p. 139 |
8-3 Three-Phase Small Commercial Calculation | p. 140 |
8-4 Three-Phase, Medium-Size Commercial Building | p. 142 |
8-5 Convenience Store | p. 144 |
8-6 Adding to Existing Service | p. 148 |
8-7 Restaurant Calculations Standard | p. 149 |
8-8 Restaurant Calculations, Optional | p. 150 |
Chapter 8 Test | p. 152 |
9 Miscellaneous Service Entrance Calculations | p. 155 |
9-1 School Calculation | p. 155 |
9-2 Computing Farm Loads | p. 157 |
9-3 Computing Mobile Homes and Mobile Home Parks | p. 158 |
9-4 Recreational Vehicles and Parks | p. 160 |
9-5 High-Rise Hotel | p. 162 |
9-6 Machine Shop | p. 165 |
Chapter 9 Test | p. 167 |
10 Conduit Bending | p. 169 |
10-1 Offsets | p. 169 |
Method 1 p. 169 | |
Method 2 p. 170 | |
Method 3 p. 171 | |
10-2 Multiple Offsets | p. 174 |
10-3 Kicks | p. 175 |
10-4 Three-Point Saddle | p. 176 |
10-5 Four-Point Saddles | p. 177 |
10-6 Ninety Degree Bends | p. 179 |
Back-to-Back 90 Degree Bends | p. 179 |
10-7 Segment Bending | p. 182 |
10-8 Circular Bends on Large Vessels | p. 190 |
10-9 Concentric 90 Degree Bends, Fast and Easy | p. 191 |
Chapter 10 Test p. 192 | |
11 Math Review | p. 195 |
11-1 Fractions | p. 195 |
11-2 Percentage | p. 199 |
11-3 Decimals | p. 201 |
11-4 Basic Algebra | p. 203 |
11-5 Angles | p. 209 |
11-6 Square Roots | p. 214 |
11-7 Metric Measurements | p. 217 |
Temperature Conversions | p. 217 |
Linear Measurement | p. 217 |
Weight Measurements | p. 218 |
Liquid Measurement | p. 219 |
Chapter 11 Test | p. 220 |
Final Test | p. 223 |
Answers to End-of-Chapter Tests and Final Test | p. 229 |
Index | p. 255 |