ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
19th Edition
ISBN: 9781337116213
Author: MULLIN
Publisher: CENGAGE L
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Textbook Question
Chapter 15, Problem 19R
The Code states that a means must be provided to disconnect an appliance. In the case of an electric clothes dryer, the disconnecting means can be (Circle the correct statemen(s).)
- a. a separate disconnect switch located within sight of the appliance.
- b. a separate disconnect switch located out of sight from the appliance. The switch is capable of being locked in the OFF position.
- c. a cord-and-plug-connected arrangement.
- d. a circuit breaker in a panel that is within sight of the dryer or capable of being locked in the OFF position.
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Select a short-circuit withstanding (1-second short circuit length) cable for Feeder 1 in
Figure 1. Values for cables are given in Table 1. The voltage of the supplying network is
now 115 kV and the short-circuit power of the supplying network is 2000 MVA.
Table 1. Technical information of 3-phase cables (10 kV and 20 kV)
Product's name
EA-number
Structural information
20KV
20KV
20 KV
0624250
0624252
0624253
0624254
AHKAMK-W AHKAMKW AHKAMKWAHKAMKW AHKAMKW AHKAMKW AHKAMKW
3x50Al+35Cu 3x95 Al. 35Cu 3x120Al. 35Cu 3x150Al+35Cu 3x185Al+35Cu 3x240A1+70 Cu 3x300Al+70Cu
20kV
20kV 20 kV (8) 20KV
0624255
0624257
0624256
Diameter of conductor
Diameter of out-most circle
Cable's outer diameter
Mass
Delivery information
Standard length
Delivery reel
mm
8.0
11.3
12.7
14.1
15.7
18.1
20.3
mm
28
32
34
35
37
40
43
mm
64
71
74
76
80
89
94
aluminium
kg/km
510
910
1100
1350
1650
2200
2700
сорраг
kg/km
305
305
305
305
305
600
600
cable
kg/km
2350
3100
3450
3800
4300
5500
6250
E
500
500
500
500
500
500
500…
A three-phase 20 kV medium-voltage line is 10 km. Resistance is 0.252 2/km and reactance
is 0.128 92/km (inductive). Voltage at the beginning of line is 21.0 kV. At the end of the line
is loading P = 2.5 MW with power factor 0.92ind. Draw 1-phase equivalent diagram and
calculate line voltage at the end the of line, active and reactive power at the beginning of the
line and power losses of the line.
A three-phase 20 kV medium-voltage line is 10 km. Resistance is 0.365 2/km and
reactance is 0.363 2/km (inductive). Voltage at the beginning of line is 20.5 kV. At the
end of the line is loading P= 800 kW with power factor 0.95ind. Draw 1-phase equivalent
diagram and calculate load current, line voltage at the end the of line, voltage drop and
power losses of the line.
Chapter 15 Solutions
ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
Ch. 15 - Prob. 1RCh. 15 - Prob. 2RCh. 15 - What special type of switch is controlling the...Ch. 15 - Prob. 4RCh. 15 - The total estimated volt-amperes for Circuit B10...Ch. 15 - If an attic is accessible through a scuttle hole,...Ch. 15 - Prob. 7RCh. 15 - Prob. 8RCh. 15 - The following is a layout of the lighting circuit...Ch. 15 - Prob. 10R
Ch. 15 - Prob. 11RCh. 15 - a. What is the minimum power demand allowed by the...Ch. 15 - What is the maximum permitted current rating of a...Ch. 15 - Prob. 14RCh. 15 - a. Must the metal frame of an electric clothes...Ch. 15 - An electric dryer is rated at 7.5 kW and 120/240...Ch. 15 - When a metal junction box is installed as part of...Ch. 15 - A residential air-conditioning unit is installed...Ch. 15 - The Code states that a means must be provided to...
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