Answered: Assuming all terminals are rated 75…

Assuming all terminals are rated 75 degrees C, what is the maximum size overcurrent protective device (fuse or breaker) that the NEC allows for protecting the following copper THHN/THWN conductors:

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition

ISBN:9781337516549

Author:Simmons

Publisher:Simmons

Chapter4: Conductor Sizes And Types, Wiring Methods, Wire Connections, Voltage Drop, And Neutral Conductor Sizing For Services

Section: Chapter Questions

Problem 30R: A wire connector bearing no marking or reference to AL, CU, or ALR is suitable for use with (copper)...

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Concept explainers

Methods of Wiring

Electrical wiring is the way of integrating cables and wires to interconnected equipment such as fuses, switches, sockets, lights, fans, and so on to the main distribution board, which is a specific structure attached to the utility pole that ensures a constant power supply.

Question

Assuming all terminals are rated 75 degrees C, what is the maximum size overcurrent protective device (fuse or breaker) that the NEC allows for protecting the following copper THHN/THWN conductors:

Four #4/0 wires inside a building

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