Length of wire = 150 feet
Voltage drop = 2 percent maximum
From figure 9, the wire size required is a No. 4
The actual voltage drop using a No. 4 wire is found to be 1.7 percent from
figure 9.
16. Section CI carries the demand load for groups III, IV, and V which is equal
to 8.50 KVA.
Length of section is 300 ft.
Allowed voltage drop is 1%
From figure 9, the required size of wire is a No. 2.
As a check, the actual
voltage drop is found from figure 9 to be 0.96 percent.
17. Load carried by section IL= 6 KVA, length 450 feet, allowed voltage drop =
1.7 percent. From figure 9, lesson 2, attached memorandum, the required wire size
is a No. 4. The actual voltage drop is found to be 1.6 percent.
18. The
table
in
figure
21,
lesson
2,
attached
memorandum,
is
completed
as
follows:
Table 1D.
Solution to Exercise 18
Hence, the total cumulative voltage drop to point N is 6.6 percent. Since this is
in excess of the maximum 6 percent allowed, larger wire will be necessary for
portions of the system.
19.
2-4
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