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A 75 HP, 3-phase, synchronous motor is connected to a 230-volt line. The motor is to be operated at 80% power factor. The motor nameplate lists a full load current of 185 amperes, a temperature rise of 40°C, and a code letter A. The conductors are to be made of copper and have type THHN insulation. The short-circuit protective device is to be an inverse time circuit breaker. Determine the conductor size, overload heater size, circuit breaker size, and the minimum size NEMA and IEC starters. The starter contains current transformers with a ratio of 300:5 to reduce current to the overload heater O Conductor size 250KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S) Conductor size 250KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA6)(IEC R or S) Conductor size 350KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S) Conductor size 300KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S)

A 75 HP, 3-phase, synchronous motor is connected to a 230-volt line. The motor is to be operated at 80% power factor. The motor nameplate lists a full load current of 185 amperes, a temperature rise of 40°C, and a code letter A. The conductors are to be made of copper and have type THHN insulation. The short-circuit protective device is to be an inverse time circuit breaker. Determine the conductor size, overload heater size, circuit breaker size, and the minimum size NEMA and IEC starters. The starter contains current transformers with a ratio of 300:5 to reduce current to the overload heater O Conductor size 250KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S) Conductor size 250KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA6)(IEC R or S) Conductor size 350KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S) Conductor size 300KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S)

Introductory Circuit Analysis (13th Edition)
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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9 A 75 HP, 3-phase, synchronous motor is connected to a 230-volt line. The motor is to be operated at 80% power factor. The motor nameplate lists a full load current of 185 amperes, a temperature rise of 40°C, and a code letter A. The conductors are to be made of copper and have type THHN insulation. The short-circuit protective device is to be an inverse time circuit breaker. Determine the conductor size, overload heater size, circuit breaker size, and the minimum size NEMA and IEC starters. The starter contains current transformers with a ratio of 300:5 to reduce current to the overload heater O Conductor size 250KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S) O Conductor size 250KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA6)(IEC R or S) O Conductor size 350KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S) O Conductor size 300KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S) +
Transcribed Image Text:9 A 75 HP, 3-phase, synchronous motor is connected to a 230-volt line. The motor is to be operated at 80% power factor. The motor nameplate lists a full load current of 185 amperes, a temperature rise of 40°C, and a code letter A. The conductors are to be made of copper and have type THHN insulation. The short-circuit protective device is to be an inverse time circuit breaker. Determine the conductor size, overload heater size, circuit breaker size, and the minimum size NEMA and IEC starters. The starter contains current transformers with a ratio of 300:5 to reduce current to the overload heater O Conductor size 250KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S) O Conductor size 250KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA6)(IEC R or S) O Conductor size 350KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S) O Conductor size 300KCMIL, Overload size X42 Inverse time circuit breaker 500A Starter size(NEMA5)(IEC R or S) +
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