Electrical Wiring Residential
19th Edition
ISBN: 9781337101837
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 18, Problem 20R
- a. When more than three current-carrying conductors are installed in one raceway, their allowable ampacities must be reduced according to NEC __________.
- b. The following is a project. We need four 15-ampere branch circuits. We will use two 3-wire multiwire branch circuits and 14 AWG THHN conductors. We will install the conductors in EMT. The room temperature will not exceed 86°F (30°C). The connected load is nonmotor and is noncontinuous.
- 1. What is the minimum trade size EMT? __________
- 2. What is the ampacity of the conductors before derating? __________
- 3. What is the ampacity of the conductors after derating? __________
- 4. What is the maximum overcurrent protection permitted for these conductors? __________
- c. Let’s increase the conductor size to 12 AWG THHN for the same installation to see what happens.
- 1. What is the minimum trade size EMT? __________
- 2. What is the ampacity of the conductors before derating? __________
- 3. What is the ampacity of the conductors after derating? __________
- 4. What is the maximum overcurrent protection permitted for these conductors? __________
- d. It (is) (is not) necessary to count equipment grounding conductors, a neutral conductor that carries the unbalanced current from other conductors of the same circuit, and/or “travelers” when installing 3-way and 4-way switches for the purposes of derating the ampacity of these conductors. Circle the correct answer. Explain.
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Students have asked these similar questions
4. Find the differential equation of the following system whose transfer function is
given by
S+3
H(s)
=
s3 +3s+2
Preliminary Laboratory (Prelab) Work
Complete the following tasks in the space provided below for the circuit shown in Figure 2.
1.
Use voltage division to compute the phasor voltages VR and Vc assuming nominal values of R = 1000[2], C = 0.01[u], and
a cosinusoidal time-domain source voltage signal given by equation 5 below. Voltage division must be used to receive any
credit. (10 points)
equation (5)
Vs(t) = VRMSCOS(ct + 0) = 5cos(@t + 0) = 5cos(62832t + 0) = 5cos(62832t) [V]
=VRMSCOS(2лft + 0) = 5cos[2л(10000)t + 0] = 5cos[2л(10000)t] [V]
2. Compute the phasor current, Is. (3 points)
3.
Calculate the complex power, S, active power, P, and reactive power, Q, for the circuit. (4 points)
4.
Construct the phasor diagram for the circuit, and show mathematically that the phasor (vector) sum of the phasor voltages VR
and Vc is equal to Vs. (3 points)
Agilent 33210A
(BECC4242) or
Vs
Keysight 33500B
(BECC4261)
Function Generators
Is
R
w
+
VR
Vc
+
+
Zc
V
out
=Vc
Figure 2: RC circuit connected…
Please explain in detail. My answer for the first question is 15/2.
I am more confused about how to do the graphing part and figure how long it will take to reach its final value.
Thank you, I will like this.
Chapter 18 Solutions
Electrical Wiring Residential
Ch. 18 - a. What circuit supplies the workshop lighting?...Ch. 18 - Prob. 2RCh. 18 - a. How is EMT fastened to masonry? _______________...Ch. 18 - What type of luminaires are installed on the...Ch. 18 - Prob. 5RCh. 18 - To what circuit are the smoke detectors connected?...Ch. 18 - Is it a Code requirement to connect smoke...Ch. 18 - Prob. 8RCh. 18 - Prob. 9RCh. 18 - Prob. 10R
Ch. 18 - Adjustment factors for conductor ampacities must...Ch. 18 - Prob. 12RCh. 18 - Prob. 13RCh. 18 - Calculate the total current draw of Circuit A17 if...Ch. 18 - Prob. 15RCh. 18 - A conduit body may contain splices if marked with...Ch. 18 - What size box would you use where Circuit A17...Ch. 18 - List the proper trade size of electrical metallic...Ch. 18 - According to the Code, what trade size EMT is...Ch. 18 - a. When more than three current-carrying...Ch. 18 - Prob. 21RCh. 18 - For laundry equipment in basements, what sort of...Ch. 18 - Prob. 23RCh. 18 - A Type NM cable carries a branch circuit to the...Ch. 18 - Prob. 25RCh. 18 - The following is a layout of the lighting circuits...Ch. 18 - Prob. 27RCh. 18 - Prob. 28R
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