EC&Ms Electrical Calculations Handbook
McGraw 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.
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Mathematics for Electrical Calculations
Solving for Current and Power Factor in an ac Circuit
Power Factor Correction to Normal Limits
Power Factor Correction System Oesign in an Electrical Power
System Containing Harmonics
Acceptable Levels of Harmonic Current and Voltage
Circuits for Special Loads
ElectricityOesign and Layout Calculations
Effects of Harmonic Voltage on Motors
SymptomsSymptoms Causes and Remedies
Generator Sizing Calculations
Electrical Cost Estimating 371
Conversion Calculations 425
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3-phase addition ALUMINUM ambient amount ampacity AMPERES angle approximately battery BRANCH CABLE calculation capacitance capacitor cause cavity characteristics circuit breaker Code coil common conductor conduit connected contains copper correction cost current ﬂow determine device electrical electrical power engine equal equipment example fault feeder FEET Figure formula frequency fuse given greater ground harmonic currents heat impedance IMPEOANCE INCHES increase inductive installation insulation LABOR lamp lighting LINE load LOAO locations luminaire magnetic method mils motor normally Note ohms operating overcurrent parallel percent phase power factor problem protection provides quantity raceway reactance relay resistance resistor resulting running selection short short-circuit shown in Fig shows simply Solve square STEEL STEP temperature transformer trip unit vector VOLTAGE OROP VOLTS WATT wire
Страница 4 - voltage of the battery is equal to the sum of the voltages of the individual cells
Страница 172 - Allowable Ampacities of Single-Insulated Conductors Rated 0 through 2000 Volts in Free Air, Based on Ambient Air
Страница 323 - is equal to the square of the current multiplied by the resistance, the
Страница 275 - single overcurrent device. If both circuit breakers and fuses are used as the overcurrent device, the total of the device ratings must not exceed that allowed for fuses.
Страница 110 - by the square root of the sum of the squares of these
Страница 169 - there are more than three currentcarrying conductors in a raceway or cable.
Страница 167 - where I is the current in amperes and R is the resistance of the
Страница 287 - consists of a structure of steel laminations mounted on a shaft. Embedded in the rotor is the rotor winding, which is a series of copper or aluminum bars that are all short-circuited at each end by a metallic end