What is the rated ampacity per phase for six No. 3/0 THHN copper current-carrying conductors with two conductors per phase ( parallel) and all conductors installed in the same conduit? a. 280 b. 315 c. 320 d. 360

What is the rated ampacity per phase for six No. 3/0 THHN copper current-carrying conductors with two conductors per phase ( parallel) and all conductors installed in the same conduit? a. 280 b. 315 c. 320 d. 360

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 37R

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Concept explainers

Distribution System

The final stage in the delivery of the electric power is the electric power distribution system. From the transmission system to the individual customers it carries electricity. The distribution system is connected with the transmission system and is used to lower the voltage of the transmission to medium voltage in the range of 2 kV to 35 kV with the help of transformers. This medium voltage to the distribution transformers located near the customer's premises is carried by the primary distribution system lines. These distribution transformers in turn lower the voltage to utilization voltage used in lightings, household appliances, industrial equipments etc. Through secondary distribution lines often several customers are supplied from one transformer. It is through service drops, the commercial and residential customers are connected to the secondary distribution system lines. Customers who demand a larger amount of power can be connected directly to the primary distribution system level or the sub-transmission level.

Question

What is the rated ampacity per phase for six No. 3/0 THHN copper current-carrying conductors with two conductors per phase ( parallel) and all conductors installed in the same conduit?

a. 280

b. 315

c. 320

d. 360

Please show work/code references to go with if possible!

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