Electrical Wiring Residential
19th Edition
ISBN: 9781337101837
Author: Ray C. Mullin, Phil Simmons
Publisher: Cengage Learning
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Question
Chapter 29, Problem 1R
To determine
State what minimum-size service is needed for a single family dwelling and also provide the NEC Code that states it.
Expert Solution & Answer
Answer to Problem 1R
The required minimum-size main service is 100 amperes and the Code is NEC 230.79(C).
Explanation of Solution
Discussion:
The National Electrical Code committee develops NEC – the standard electrical code. The main objective for the origin of the code is to protect and safeguard the person and elements from electrical hazards.
For a one family dwelling, according to National Electric Code NEC 230.79(C), the required minimum-size service is 100 amperes.
Conclusion:
Thus, the required minimum-size main service is 100 amperes and the Code is NEC 230.79(C).
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2. With respect to the circuit shown in Figure 2 below
V2
-R1
R2
R4
w
R3
R5
Figure 2: DC Circuit 2
a. Using Ohm's and Kirchhoff's laws calculate the current flowing through R3
and so determine wattage rating of R3.
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Table 2
V2
(Volts)
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R2 (KQ)
R3 (KQ)
R4 (KQ)
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Chapter 29 Solutions
Electrical Wiring Residential
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