70. A circuit supplies a continuous load of 38 amperes and is protected by a 50-amperecircuit breaker. All conductor terminations in the circuit are rated at 75°C. If the circuit conductors are THWN copper, determine the minimum size permitted for the circuit. A. 60 A B. 50 A C. 40 A D. 70 A

70. A circuit supplies a continuous load of 38 amperes and is protected by a 50-amperecircuit breaker. All conductor terminations in the circuit are rated at 75°C. If the circuit conductors are THWN copper, determine the minimum size permitted for the circuit. A. 60 A B. 50 A C. 40 A D. 70 A

Electricity for Refrigeration, Heating, and Air Conditioning (MindTap Course List)

10th Edition

ISBN:9781337399128

Author:Russell E. Smith

Publisher:Russell E. Smith

Chapter16: Installation Of Heating, Cooling, And Refrigeration Systems

Section: Chapter Questions

Problem 21RQ

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Concept explainers

Dielectric Breakdown

A dielectric is a material with low electrical conductivity and so is classified as an insulator. Dielectric materials are used to block the flow of electricity through them, allowing them to behave as an insulators. They can also be used to store electric charge or improve capacitance.Dielectrics have no free electrons for conduction because electrons are tightly bound to the nucleus. Because dielectrics contain a small number of electrons for electrical conductivity, they have a dipole. The two primary roles of dielectrics in electrical devices are insulation and electrical energy storage. An electric field polarizes the dielectric, and the polarization of the molecules allows dielectric materials to store charge.

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70. A circuit supplies a continuous load of 38 amperes and is protected by
a 50-amperecircuit breaker. All conductor terminations in the circuit are
rated at 75°C. If the circuit conductors are THWN copper, determine the
minimum size permitted for the circuit.
A. 60 A
B. 50 A
C. 40 A
D. 70 A

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