EC&Ms Electrical Calculations HandbookMcGraw Hill Professional, 15. 12. 2000. - 435 страница 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. |
Садржај
1 | |
ThreePhase Systems | 55 |
Mathematics for Electrical Calculations | 69 |
Solving for Current and Power Factor in an ac Circuit | 75 |
Power Factor Correction to Normal Limits | 87 |
Power Factor Correction System Design in an Electrical Power | 93 |
System Containing Harmonics | 104 |
Acceptable Levels of Harmonic Current and Voltage | 110 |
Grounding | 205 |
Lighting | 221 |
Transformers | 251 |
Motors | 285 |
Raceways | 311 |
Overcurrent Devices | 319 |
Circuits for Special Loads | 335 |
Electrical Design and Layout Calculations | 357 |
Effects of Harmonic Voltage on Motors | 116 |
Harmonics Symptoms Causes and Remedies | 122 |
Calculating the Impedance of a Cable | 133 |
ShortCircuit Calculations | 179 |
Generator Sizing Calculations | 195 |
Electrical Cost Estimating 371 | 5 |
Conversion Calculations 425 | 7 |
Index 433 | |
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ac circuit ampacity AMPERE RATING AMPERES STEP battery BRANCH CIRCUIT CABLE IMPEDANCE cable tray CALCULATE THE VOLTAGE capacitance capacitor circuit breaker circular mils COMPRESSION LUG CONDUIT ELBOW connected COPPER current flow DROP ACROSS LOAD DROP IN CABLE electrical degrees electrical power system electrical system EMT CONDUIT EQUIPMENT GROUNDING CONDUCTOR fault current feeder Figure fixture FLUORESCENT footcandle frequency FULL LOAD fuse GROUNDING CONDUCTOR harmonic currents heat horsepower inductive reactance inductor INSTALLATION LABOR insulation KCMIL kilovoltampere kilowatt KVAR lamp lighting line current lumens luminaire magnetic MALE ADAPTER MINIMUM nameplate National Electrical Code normally OHMS operating overcurrent device rating percent power factor power factor correction PROBLEM protection PVC ELBOW raceway relay resistance resistor RIGID STEEL CONDUIT shown in Fig single-phase SOLUTION Solve square SWITCH THHN THHW three-phase transformer vector VOLT-AMPERES VOLTAGE DROP VOLTS WATT WIRE AMPACITY XHHW
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