and electric devices and horsepower of
required to serve a given connected
all motors.
The load is usually
load.
The demand factor is the ratio
expressed in KVA (kilo-volt-amperes).
between the estimated maximum demand
For purposes of estimation, 1000 watts
and the connected load for various
of lighting load or 1 horsepower of
types of structures.
Naturally the
motor or power load equal 1 KVA.
A
demand load may never be greater than
second
method
of
estimating
the
the total connected load, and is
connected load is by use of a standard
usually less because different pieces
load expressed in watts per square
of apparatus are used at different
foot
for
a
particular
type
of
times or because the peak loads of
building.
Such standard loads may be
these various pieces do not occur
found
in
appropriate
TM's.
simultaneously.
An exception occurs
Multiplying the floor area of a given
when all of the using pieces are of
type of building by its standard load
the same type and used at the same
will give the connected load for the
time to full capacity, as in street
building. Finally, the connected load
lighting circuits and yard lighting.
may be determined by summing the power
The demand factor for this exception
requirements
of
connected
lights,
is 1.00.
However, a machine shop
appliances, or motors in a given
whose maximum demand may have been
building
(analogous
to
counting
measured to be 31.4 KW could have a
outlets and showers in water supply).
total connected load of:
This may be done either from drawings
of the individual buildings or from
Thirty 60-watt lamps-------------1.8 KW
visual inspection of the apparatus in
the buildings to be serviced.
In all
Twenty 100-watt lamps------------2.0 KW
of these estimations, the connected
load
should
be
determined
per
Motors, connected, 30 hp--------30.0 KW
building.
To expedite the estimating
of connected loads to the various
Heaters--------------------------9.0 KW
types of buildings considered in this
course, table 1 will be used for
Welding equipment---------------20.0 KW
obtaining the lighting and power loads
to each building.
This table also
Total connected load---------62.8 KW
gives the type of power required,
single phase or three phase, and the
wiring. The values given are in KVA.
(1) Demand load. The demand load
is the actual maximum demand in KVA
Table 2.
Demand Factors for Military Installations
1-9
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