is to issue a directive for the
What size generator or combination of
installation of a generator which will
generators would you use and how would
economically
provide
the
necessary
you distribute the loads?
(Neglect
power.
Which of the generators of
generator factor.)
table 4 would you select and what sort
of lighting would you recommend be
Solution: To insure continuity of
used?
service and to permit repair of units,
one of the following combinations
Solution:
For
such
a
small
should be selected:
lighting load as this, the smallest
generator available should be used,
(1) 3-10KW 3 120/208V
namely, the 0.15 KW, 60-cycle, 120-
volt size.
Its capacity is 150 watts
(2) 1-15KW 3 120/208V
which should satisfy the commander's
needs by providing power for either of
1-10KW 3 120/208V
the following lighting arrangements:
1-5KW 3 120-208V
(1) One 150 watt bulb.
(3) 2-15KW 3 120-208V
(2) Two 75 watt bulbs.
Combination (2) would be difficult to
In hooking up these lights, however,
operate if the full load had to be
it should be emphasized that a series
supplied when the 15KW generator was
circuit will not do because then the
down for repairs (par 10b(2)) while
lights would not develop their rated
combination
(3)
would
be
rather
wattage and so would burn dimly.
A
inefficient (par 10b(3)). Combination
parallel circuit must be used in
(1) would probably be the best choice.
setting up the lights.
This provides
a constant 120 volts across each lamp.
13. GENERATOR LOCATION
b. Example
2.
You
are
to
It is common practice to locate
provide power for a company operating
generators
near
points
of
large
away from your battalion.
The demand
demand
(laundries,
bakeries,
load has been estimated as follows:
maintenance shops, etc.) in order
to
reduce
the
size
and
amount
Load
of wire required.
Generator location
may
be
selected
by
studying
the
1 Quarters lighting 1 4.0KW 120V
map on which demands are plotted.
In
general,
small
demands,
such
as
1 0.6KW 120V
2 Dayroom
barracks may be served by generators
at distances up to 1,500 feet in
3 Messhall and
wire length and moderate demands, up
1 4.0KW 120V
kitchen
to 1,000 feet. If tentative generator
locations
already
selected
are
1 0.4KW 120V
4 Orderly room
too far apart, they may be shifted.
The final location should be near a
1 0.5KW 120V
5 Supply room
road and on firm ground.
A concrete
foundation should be provided for
semipermanent generator installations
3 4.0KW 208V
6 Shop (power)
where size is 30KW or larger.
As a
safety measure, the generator site
1 1.0KW 120V
7 Shop (lighting)
should not be placed near storage
Total
14.5KW
areas
of
flammable
products
such
1-13
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