Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 21, Problem 11SQ
From the elementary drawing in Figure 21–10, determine the number and terminal identification of the wiring in each conduit in the conduit layout. Indicate your solutions in the same manner as the example given below the disconnect switch.
FIG. 21–10
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We are running 3 wires and a ground in a RMC to a control panel with a 60 amp circuit breaker disconnect in the control panel. The conduit is run along the ceiling where the ambient air temperature is 100 degrees. The control panel feeds our secondary cooling pump. What size are the ungrounded conductors? All conductors have typeTHHN insulation.
A
#6 AWG
B
600 Kcmil
C
#8 AWG
D
#2 AWG
What size RMC do we need?
A
3"
B
3/4"
C
1"
D
1 1/2"
QUESTION 5
We would like to run the power wires for both cooling pumps in the same RMC from the Breaker panel to a junction box above the control panel. What size ungrounded conductors do we need for the 100 amp load? All conductors have typeTHHN insulation.
A #6 AWG
B #3 AWG
C #4 AWG
D #1 AWG
Don't copy. Need zero plagiarism answer and correct answer. I will rate.
Chapter 21 Solutions
Electric Motor Control
Ch. 21 - How is a change in the direction of rotation of a...Ch. 21 - Prob. 2SQCh. 21 - If a reversing control circuit contains...Ch. 21 - How is auxiliary contact interlocking achieved on...Ch. 21 - After the forward coil has been energized, is the...Ch. 21 - If a mechanical interlock is the only means of...Ch. 21 - If pilot lights are to indicate which coil is...Ch. 21 - What is the sequence of the operations if the...Ch. 21 - In place of the push buttons in Figure 214, draw a...Ch. 21 - From the elementary drawing in Figure 2110,...
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