EBK ELECTRICAL WIRING RESIDENTIAL
19th Edition
ISBN: 9781337516549
Author: Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 20.2, Problem 10R
a.
To determine
Mention the maximum demand of a free-standing electric range.
b.
To determine
Mention the minimum size of the ungrounded copper conductors.
c.
To determine
Mention the minimum size of the neutral copper conductors.
d.
To determine
Mention the rating of overcurrent protection device for branch-circuit.
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1. Alternating current systems of less than _______ volts are required to be grounded if they're installed outside as overhead conductors.
A. 50 B. 100 C. 75 D. 120
A free-standing electric range is rated 11.8 kW, 120/240 volts. The wiring method is nonmetallic-sheathed cable. Use the 60°C column of Table 310.16 in conformance to 110.14(C). Answer the following questions:
According to Column C, Table 220.55, what is the maximum demand?
What is the minimum size for the ungrounded copper conductors?
What is the minimum size neutral copper conductor?
What is the correct rating for the branch-circuit overcurrent protection?
Connect the initial circuit as shown in Figure 47-1.2. Set VA at 20 volts. Insert a jumper wire between points A and B and observe the meter action.OBSERVATION Current flowed for approximately ___________ seconds as evidenced by the voltagemeasured across R. The rate of charge was (linear, nonlinear) __________________.nCONCLUSION The current that flowed was the charging current that charged the capacitor to avoltage equal to (VR, VA) ____________________. Was charging current maximum atthe beginning of the charge time or near the end? _________. At the beginning of thecharge time, the voltage across R was equal to (VC , VA) _______________________(the first instant). At the end of the charge time, the voltage across the resistor is________ volts; the voltage across the capacitor is equal to VA.
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EBK ELECTRICAL WIRING RESIDENTIAL
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