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EC&M's Electrical Calculations Handbook - John Paschal

EC&M's Electrical Calculations Handbook

Paperback Published: 15th December 2000
ISBN: 9780071360951
Number Of Pages: 464

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The most frequently used electrical calculations--worked out in an instant-access format Edited by John Paschal, EC;M's Electrical Calculations Handbook brings you the expertise of two of the industry's most respected names: McGraw-Hill and EC;M (Electrical Construction; Maintenance) Magazine--the premiere magazine for electrical design, construction, and maintenance. This handy guide packs all the essential calculations every electrical professional needs to properly design, install, and maintain electrical equipment, from wiring and circuits, to batteries and generators. You get basic electrical working definitions and concepts, and coverage of three-phase systems; math for electrical calculations, power factor correction, and calculations for harmonics; conductors; short-circuit calculations; grounding; lighting; transformers; motors; raceways; overcurrent devices; circuits for special loads; electrical design and layout calculations; electrical cost estimating; and conversion calculations.

Prefacep. xi
List of Problemsp. xiii
Basic Electrical Working Definitions and Conceptsp. 1
Voltage as Potential Differencep. 1
Currentp. 3
Resistancep. 4
Direct-Current (dc) Voltage Sourcesp. 4
Direct and Alternating Currentp. 5
dc Voltagep. 6
Current Flow in a Resistive Circuitp. 15
Current Flow in a Series Resistive Circuitp. 16
Voltage Division in a Series Circuitp. 18
Power Rating of a Resistorp. 18
ac Voltagep. 23
ac Circuits with Resistancep. 23
ac Phase Angle and Powerp. 26
Current and Power in a Single-Phase ac Ricuitp. 33
Current and Power in a Three-Phase ac Circuitp. 33
Inductive Reactancep. 42
Capacitive Reactancep. 46
Impedancep. 52
Three-Phase Systemsp. 55
Wye-Connected Systemsp. 58
Delta-Connected Systemsp. 60
Mathematics for Electrical Calculations, Power Factor Correction, and Harmonicsp. 69
Changing Vectors from Rectangular to Polar Form and Back Againp. 69
Adding Vectorsp. 70
Multiplying or Dividing Vectorsp. 74
Solving for Current and Power Factor in an ac Circuit Containing Only Inductive Reactancep. 75
Solving for Current and Power Factor in an ac Circuit Containing Both Inductive Reactance and Resistance in Series with One Anotherp. 77
Solving for Current and Power Factor in an ac Circuit Containing Two Parallel Branches That Both Have Inductive Reactance and Resistance in Series with One Anotherp. 77
Solving for Current and Power Factor in an ac Circuit Containing Parallel Branches, One of Which has Inductive Reactance and Resistance in Series with One Another and the Other of Which Has a Capacitive Reactancep. 79
Electrical Power in Common ac Circuitsp. 79
Power Factor Correction to Normal Limitsp. 87
Real Power (Kilowatts), Apparent Power (Kilovoltamperes), Demand, and the Electrical Utility Billp. 90
Power Factor Correction Systems Design in an Electrical Power System Containing No Harmonicsp. 93
Power Factor Correction System Design in an Electrical Power System Containing Harmonicsp. 104
Calculating the Parallel Harmonic Resonance of an Electrical Power System Containing Capacitorsp. 107
Resulting Values of Adding Harmonic Currents or Voltagesp. 108
Acceptable Levels of Harmonic Current and Voltagep. 110
The Harmonic Current-Flow Modelp. 111
Effects of Harmonic Current on Transformersp. 114
Effects of Harmonic Voltage on Motorsp. 116
Harmonic Current Flow through Transformersp. 116
Harmonic Filtersp. 117
Harmonics Symptoms, Causes, and Remediesp. 122
Conductorsp. 125
Conductors, Conductor Resistance, Conductor and Cable Impedance, and Voltage Dropp. 125
Calculating the One-Way Resistance of a Wirep. 125
Calculating the Impedance of a Cablep. 133
Calculating Voltage Drop in a Cablep. 140
Calculating dc Resistance in a Bus Barp. 143
Calculating Heat Loss in a Conductorp. 143
Wires and Cablesp. 143
Determining Wire Size Given Insulation Type, Circuit Breaker Clearing Time, and Short Circuit Currentp. 160
Selecting the Proper Insulation for an Environmentp. 161
Aluminum Conductorsp. 170
Conductor and Cable Selectionp. 170
Short-Circuit Calculationsp. 179
Sources of Short-Circuit Currentp. 182
The Ability of the Electrical Utility System to Produce Short-Circuit Currentp. 183
Short-Circuit Contributions of On-Site Generatorsp. 184
Short-Circuit Contributions of Motorsp. 185
Let-Through Values of Transformersp. 187
Let-Through Values of Reactorsp. 188
Let-Through Power Values of Cablesp. 189
Sample Short-Circuit Calculationp. 190
Generator Sizing Calculationsp. 195
Sizing a Gas-Turbine Generator Set for a Known Kilowatt Loadp. 196
Sizing a Reciprocating Engine-Driven Generator Set for a Known Kilowatt Loadp. 198
Sizing of Generator Feeder Conductorsp. 200
Groundingp. 205
The Functions of Groundingp. 205
Calculating the Resistance to Remote Earth of Ground Rodsp. 208
Grounding-Electrode Conductorsp. 211
Equipment-Grounding Conductorsp. 211
Methods of Grounding Systemsp. 215
Obtaining the System Grounding Pointp. 217
Lightingp. 221
The Lumen Methodp. 221
The Point-by-Point Methodp. 223
Indoor Lightingp. 229
Lighting Rules of Thumbp. 245
Transformersp. 251
Three-Phase Transformersp. 255
Overcurrent Protection of Transformersp. 265
Buck-Boost Autotransformersp. 275
Motorsp. 285
Selecting Motor Characteristicsp. 286
Calculating Motor Running Currentp. 295
Calculating Motor Branch-Circuit Overcurrent Protection and Wire Sizep. 296
Racewaysp. 311
Raceway Types and Their Characteristicsp. 311
Overcurrent Devicesp. 319
Overcurrent Devices: Fuses and Circuit Breakersp. 319
Fusesp. 321
Circuit Breakersp. 323
Medium-Voltage and Special-Purpose Circuit Breakers and Relay Controllersp. 325
Circuits for Special Loadsp. 335
Designing Circuits for Various Electrical Loadsp. 335
Designing an Electrical System for a Commercial Buildingp. 339
Designing an Electrical System for an Industrial Facilityp. 349
Electrical Design and Layout Calculationsp. 357
Straight-Through Pull Box in a Conduit Systemp. 357
Angle Pull Box in a Conduit Systemp. 358
Working Space Surrounding Electrical Equipmentp. 358
Minimum Centerline-to-Centerline Dimensions of Knockouts to Provide for Locknut Clearancep. 364
Electrical Cost Estimatingp. 371
Electrical Takeoff and Personnel-Hour Cost Estimatingp. 371
Factoring of Labor Unitsp. 397
Estimate of Project Expensep. 409
Engineering Economics Calculations Considering the Time Value of Moneyp. 411
Conversion Calculationsp. 425
Temperature Conversion Calculationsp. 425
Frequently Used Conversion Calculationsp. 425
Multiple Conversion Calculationsp. 425
Indexp. 433
Table of Contents provided by Syndetics. All Rights Reserved.

ISBN: 9780071360951
ISBN-10: 0071360956
Audience: Professional
Format: Paperback
Language: English
Number Of Pages: 464
Published: 15th December 2000
Publisher: McGraw-Hill Education - Europe
Country of Publication: US
Dimensions (cm): 20.96 x 13.97  x 3.18
Weight (kg): 0.45