Figure 22.
For use with exercise 19.
16. Allowing a 1 percent voltage
Solve multiple-
drop for section CI of the feeder,
choice exercises 19 and 20 based on
what size wire will be required?
the following situation to show that
a. 2
c. 6
you
understand
the
principles
of
b. 4
d. 1/0
branch line design.
17. Section IL of the feeder is
Situation. Figure 22 is a detail of
the longest, being 450 feet in
group V for which you are to design
length.
Allowing
1.7
percent
the branch line.
The line will be
voltage drop for this section, what
laid out as shown.
The cumulative
will be the required size wire?
voltage drop to point N has been
a. 4
c. 8
computed as 4.95 percent.
The demand
b. 6
d. 2/0
loads for these buildings are as
follows:
18. Figure 21 shows the tabulation
for the sizes of wire employed for
Building
Demand KVA
that
part
of
the
feeder
line
23
.117
running from the generator to point
24
.204
N.
Assuming the sizes listed are
25
.117
to be installed, what will be the
26
1.062
cumulative percent voltage drop to
27
.117
point N? (Loads are those given in
the situation.)
19. What
is
the
equivalent
a. 4.2
c. 5.6
distance from the branch line in
b. 4.8
d. 6.6
feet for this group of buildings?
2-30
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