Electrical Wiring Residential
18th Edition
ISBN: 9781285170954
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Textbook Question
Chapter 3, Problem 37R
In the past, it was common practice to connect the lighting and receptacle(s) in a bathroom to the same circuit. Because of overloads caused by high-wattage grooming appliances, the Code now requires that these receptacle(s) be supplied by a separate 20-ampere branch circuit. Where in the Code is this requirement found? NEC __________
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Questions:
Q1: Verify that the average power generated equals the average power
absorbed using the simulated values in Table 7-2.
Q2: Verify that the reactive power generated equals the reactive power
absorbed using the simulated values in Table 7-2.
Q3: Why it is important to correct the power factor of a load?
Q4: Find the ideal value of the capacitor theoretically that will result in unity
power factor.
Vs pp (V)
VRIPP (V) VRLC PP (V)
AT (μs)
T (us)
8°
pf
Simulated
14
8.523
7.84
84.850
1000
29.88
0.866
Measured
14
8.523
7.854
82.94
1000
29.85
0.86733
Table 7-2 Power Calculations
Pvs (mW) Qvs (mVAR) PRI (MW) Pay (mW)
Qt (mVAR)
Qc (mYAR)
Simulated
-12.93
-7.428
9.081
3.855
12.27
-4.84
Calculated
-12.936
-7.434
9.083
3.856
12.32
-4.85
Part II: Power Factor Correction
Table 7-3 Power Factor Correction
AT (us)
0°
pf
Simulated
0
0
1
Measured
0
0
1
electric plants
Draw the column diagram. Calculate the voltage drop. by hand writing
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Chapter 3 Solutions
Electrical Wiring Residential
Ch. 3 - Prob. 1RCh. 3 - How are branch circuits rated? See NEC 210.3._____Ch. 3 - Prob. 3RCh. 3 - Prob. 4RCh. 3 - What spaces are not included in the floor area...Ch. 3 - What is the unit load per square foot for dwelling...Ch. 3 - According to NEC 210.50(C), a laundry equipment...Ch. 3 - How is the total load in volt-amperes for lighting...Ch. 3 - How is the total lighting load in amperes...Ch. 3 - How is the required number of branch circuits...
Ch. 3 - What is the minimum number of 15-ampere lighting...Ch. 3 - How many lighting branch circuits are provided in...Ch. 3 - Prob. 13RCh. 3 - How is the load determined for outlets supplying...Ch. 3 - What type of circuits must be provided for...Ch. 3 - Prob. 16RCh. 3 - In a single-family dwelling, how is overcurrent...Ch. 3 - Prob. 18RCh. 3 - The minimum number of outdoor receptacles for a...Ch. 3 - The Code indicates the rooms in a dwelling that...Ch. 3 - Prob. 21RCh. 3 - Prob. 22RCh. 3 - Prob. 23RCh. 3 - Prob. 24RCh. 3 - Prob. 25RCh. 3 - Although the Code contains many exceptions to the...Ch. 3 - The rating of a branch circuit is based on (Circle...Ch. 3 - a. A 25-ampere branch-circuit conductor is derated...Ch. 3 - Prob. 29RCh. 3 - Prob. 30RCh. 3 - Prob. 31RCh. 3 - Prob. 32RCh. 3 - A split-level home has one stairway that has six...Ch. 3 - Prob. 34RCh. 3 - Prob. 35RCh. 3 - Prob. 36RCh. 3 - In the past, it was common practice to connect the...Ch. 3 - If a residence has two bathrooms, the Code states:...Ch. 3 - Prob. 39RCh. 3 - Prob. 40RCh. 3 - Prob. 41RCh. 3 - Prob. 42RCh. 3 - Prob. 43R
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