Loads defined as unusual will typically be found as
motor loads, resistance electric loads, or process steam or hot
water loads. Estimating these loads can be a straightforward
calculation of operating rate or capacity multiplied by the hours
of operation. However, in many cases the hours of operation are
not well known. The rate or capacity of equipment can also be
hard to identify accurately. In the case of constant loads such
as strip heaters or single-level steam appliances, the nameplate
rating expressed in energy per hour can be considered an
appropriate value. For motors and other induction loads, the
actual consumption rate value will depend on actual loading of
the equipment. This loading will vary greatly and may be
difficult to quantify. In most cases, the nameplate values will
be a maximum that is not often achieved. Estimates of these
unusual loads must be added to the total energy consumption value
derived for the typical building with which it is associated. To
estimate each load, the following steps can be used:
a) Identify the nameplate or other value of capacity.
If part-load or other actual operational conditions that affect
actual energy draw can be determined, they should be taken into
c) Calculate consumption by multiplying consumption
rate by time.
d) Add this value to the electric or nonelectric total
Street and Exterior Lighting. Street and exterior
lighting is defined to be any exterior lighting other than that
typically found around a building. Therefore, normal
safety/security lighting (e.g., lighting over doorways and
entrances; porch lights) is not typically considered exterior.
Lighting in parking areas, security lighting, or floodlighting
for outdoor work at night are typically considered exterior. The
energy this lighting consumes is not usually assigned to specific
buildings or activities and is often accounted for separately.
The determination of whether this energy use is