ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
19th Edition
ISBN: 9781337116213
Author: MULLIN
Publisher: CENGAGE L
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Chapter 1, Problem 4R
What do the letters “UL” signify?
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2)
The phase voltage at the terminals of a balanced three-phase Y-connected load is 2400 V. The load
has an impedance of 16+j12 2/6 and is fed from a line having an impedance of 0.10+j0.80 2/6. The Y-
connected source at the sending end of the line has a positive phase sequence and an internal impedance of
0.02+j0.16 2/6. Use the a-phase voltage at the load as the reference.
a) Construct the a-phase equivalent circuit of the system
b) Calculate the line currents IaA, IbB, and Icc
c) Calculate the phase voltages at the terminals of the source, Van, Vbn, Vcn-
d) Calculate the line voltages at the source, Vab, Vbc and Vca.
e) Calculate the internal phase-to-neutral voltages at the source, Va'n, Vb'n, Ve'n,
1)
•
A balanced three-phase circuit has the following characteristics:
Y-Y connected
The line voltage at the source is Vab = 120√3(0°V
•
The phase sequence is positive
The line impedance is 2+ j3 2/0
The load impedance is 28 + j37 02/0
a) [4 pts] Draw the single phase equivalent circuit for the a-phase.
b) [2 pts] Calculate the line current IaA in the a-phase.
c) [4 pts] Calculate the line voltage VAB at the load in the a-phase.
Find the value of V0 using the superposition method. Note: The answer is V0=-428.57mv
Chapter 1 Solutions
ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
Ch. 1 - Prob. 1RCh. 1 - Prob. 2RCh. 1 - Does the NEC provide minimum or maximum standards?...Ch. 1 - What do the letters UL signify?Ch. 1 - What section of the NEC states that all listed or...Ch. 1 - Prob. 6RCh. 1 - Prob. 7RCh. 1 - Does compliance with the NEC always result in an...Ch. 1 - Name two nationally recognized testing...Ch. 1 - Prob. 10R
Ch. 1 - Prob. 12RCh. 1 - A junction box on a piece of European equipment is...Ch. 1 - Prob. 14RCh. 1 - You will learn in Chapter 3 that residential...Ch. 1 - Prob. 16RCh. 1 - What can you do to reduce or eliminate the...Ch. 1 - What is the NEC definition of a qualified person?Ch. 1 - Are low-voltage systems totally safe? Explain.Ch. 1 - Prob. 21RCh. 1 - What do the letters PPE stand for?...Ch. 1 - Prob. 23RCh. 1 - Where might you obtain information about...Ch. 1 - Prob. 25R
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