primary missions, thus resulting in disastrous situations or extreme safety
hazards as compared to minor disruption and inconvenience. Such vital
operations may include, but are not necessarily limited to, communications,
ventilation, and lighting of combat operations centers, personnel bomb
shelters, anti-aircraft, harbor defenses, industrial processes that might
cause explosion if interrupted, hospital surgeries, blood banks, bone banks,
iron lungs, and similar operations.
3.3.4
Uninterruptible (No-Break) Electric Power. An Uninterruptible
Power Supply (UPS) system is necessary for certain electronic or other
equipment that perform a critical functions and require continuous,
disturbance-free electric power to operate properly. This electric power
system must, under all conditions, provide regulated electric power to the
critical load.
3.4
Acceptable Electric Power Sources. Electric power sources
acceptable for supplying shore facilities are given in paras. 3.4.1 through
3.4.4.
3.4.1
Primary. The primary source of electric power may be navy-owned
generating equipment or one or more feeders from an outside electric power
system.
3.4.2
Standby. Where the primary source of electric power is Navy-owned
generation, the standby source may be other Navy-owned generation or service
supplied over a feeder, or feeders, from an outside electric power supplier.
Where the primary source of electric power is from an outside electric power
supplier, the standby source may be Navy-owned generation or service supplied
over a feeder, or feeders, from a different outside electric power supplier
or supply from an alternate feeder from the same outside electric power
supplier. The alternate feeder must be located at some distance from the
normal feeder, and supplied independently of the substation and generating
source of the normal feeder. Where this is not feasible, a supply from
transmission lines or substations of the outside electric power supplier,
which themselves have dual supplies, is an acceptable alternative.
3.4.3
Emergency. Permanently installed, mobile or semimobile, manual or
automatic starting generating equipment should be provided to supply
emergency electric power. Emergency generating capacity should not exceed
the minimum required to supply electric power for vital operations, and
should be located as close to those loads as practicable. Provisions for
normal load growth (15 to 20 percent spare capacity) shall be provided. As a
minimum, the provisions of NFPA 110 Emergency and Standby Power Systems,
shall apply.
3.4.4
Uninterruptible (No-Break) Electric Power. Permanently installed,
automatically operated equipment should be provided to supply uninterruptible
electric power. Equipment capacity should not exceed the minimum required to
supply electric power for critical loads, and equipment should be located as
close to these loads as practicable. Provision for normal load growth (15 to
20 percent spare capacity) shall be provided.
3.5
Purchased Electric Power Requirements. In the selection of private
utility electric power supplies consider the factors in paras. 3.5.1 through
3.5.5.
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