By Stephen L. Herman
Electric WIRING commercial, 15E is the whole, step by step consultant to wiring commercial structures in line with the present 2014 nationwide electric Code. an incredible on-the-job reference for apprentice and journeyman electricians, construction contractors, and an individual operating within the electric box, electric WIRING INDUSTRIAL,15E provides concise, hassle-free info in a pragmatic, task-oriented variety. bankruptcy issues discover all basics, from fitting new electric carrier and changeovers from outdated structures to undertaking making plans and upkeep tactics. The booklet highlights the 2014 nationwide electric Code during the readings to illustrate code updates, in addition to the way to follow specifications to sitework, feeder bus structures, panelboards, fiber optics, harmonics, and extra . as well as an entire pattern set of business construction plans, electric WIRING commercial, 15E illustrates techniques with stimulating drawings, photos, and different photographs to aid studying and boost the reasoning talents which could raise you to the subsequent point of your profession.
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Extra info for Electrical Wiring Industrial (15th edition)
CHAPTER 2 The Unit Substation 34 Wye-connected 4160-volt primary L1 L2 L3 H0 X2 X1 X Copyright © 2015 Cengage Learning®. H5 3952 H4 4056 H3 4160 H2 4264 H1 4368 3 Delta-connected 480-volt secondary FIGURE 2-14 Three-phase power transformer with a wye-connected primary and delta-connected secondary. Primary connections Secondary connections Courtesy of ABB Taps FIGURE 2-15 Taps built into a transformer. Copyright 2015 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part.
Copyright 2015 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. Due to electronic rights, some third party content may be suppressed from the eBook and/or eChapter(s). Editorial review has deemed that any suppressed content does not materially affect the overall learning experience. Cengage Learning reserves the right to remove additional content at any time if subsequent rights restrictions require it. 32 Amps Line Voltage 480 Volts Phase Current 10 Amps Phase Voltage 480 Volts FIGURE 2-5 In a wye connection, the phase FIGURE 2-6 In a delta connection, the phase voltage is less than the line voltage by a factor of the square root of 3.
2. When meter (B) reads less than one-half of meter (A), the power factor is about 90%. 3. When meter (B) reads more than one-half of meter (A), the power factor is below 90% and a penalty rate is charged by the power company. Current Transformer Ratio: 2,000:5 WATT-HOUR METER C A C A VAR-HOUR METER A B To Load Autotransformer Max. Voltage 150 V Max. Current 5A Copyright © 2015 Cengage Learning®. A FIGURE 2-18 Connections for high-voltage metering of watt-hours and var-hours. company personnel.