Answered: 1. What size conductor would be…

Engineering

Electrical Engineering

1. What size conductor would be required to supply

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter34: Motor Installation

Section: Chapter Questions

Problem 9RQ

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Concept explainers

Three Phase Induction Motor

The induction motor is an electric motor that runs on AC (alternating current) and it is of two type single phase motor that work on single-phase power supply and three-phase motor that work on three-phase power supply.

Question

All answers should be written in complete sentences. Calculations should be shown in detail, and Code
references should be cited when appropriate. Unless otherwise stated, all conductors are copper type THHN, and the supply is AC.

1. What size conductor would be required to supply three motors connected to a 440-
volt, 3-phase branch circuit? Motor #1 is a 50-horsepower, code B induction motor;
motor #2 is a 40-horsepower, code H induction motor; and motor #3 is a 50-horsepower, code J induction motor.

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All answers should be written in complete sentences. Calculations should be shown in detail, and Codereferences should be cited when appropriate. Unless otherwise stated, all conductors are copper type THHN, and the supply is AC. 1. What is the minimum conductor size, overload protection, and inverse-time circuitbreaker rating for a circuit supplying a 230-volt, 3-phase, code A, 40°C, 75-horsepower synchronous motor operating at an 80% power factor with a nameplate full-load current of 185 amperes?
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