3.5.5
Primary Substations
3.5.5.1
Voltage. A substation may not be required where the utility
company serves energy at 13.8 kV or less; distribution may be at this
voltage. In some cases, if the loads are large enough, distribution may be
done at higher voltage up to a maximum of 35 kV. Refer to Section 6 for
information on levels of distribution voltage, and MIL-HDBK-1004/2 for data
on substations.
3.5.5.2
Economics. Usually, ownership of main substations serving an
activity is determined by engineering and economic factors. Distribution
system voltages, as well as amortization costs of substations, should be the
controlling factors.
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