Answered: An industrial customer with a…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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An industrial customer with a three-phase, 480 V service entrance is running the following
set of loads:
• One 12 ton heat pump1 with a COP of 2.7 and a 0.90 lagging power factor
• Three 5 HP, 87% efficient lathes, 0.82 lagging power factor
• Three electric autoclaves, 10 kBTU/h, 98% efficient, 0.97 lagging PF
• One 12 kW high-intensity discharge (HID) lighting system, unity PF
If the lighting system is replaced with a T8 fluorescent system with magnetic ballast that
consumes 25% less than the previous system, but introduces a 0.89 leading power factor, by
how much does the service entrance current change? Consider the case when all systems are
fully loaded. Consider the AC load under the new lighting regime

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