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 MIL-HDBK-1012/1
Section 5: ELECTRICAL ENGINEERING
5.1
General. All electronic facilities operated by the Navy, however
varied in function, have similar requirements for electrical energy,
grounding, bonding, and shielding, which are set forth below. In addition,
all standard electrical criteria for naval shore facilities are applicable.
Specific guidance for particular facilities will be contained in the BESEP.
The designer must be concerned with the general requirements as well as the
specifics in order to achieve an integrated and compatible electronic facility
design.
5.2
Electrical Power Requirements. The ability of an electronic
facility to perform its mission depends directly on the adequacy and
reliability of the systems that supply and distribute its electrical power.
An acceptable degree of power system reliability can be obtained only from the
proper combination of primary, emergency, standby, uninterruptible, and
conditioned power sources. Refer to MIL-HDBK-1004/1, Electrical Engineering -
Preliminary Design Considerations, and MIL-HDBK-411, Power and Environmental
Control for Physical Plant OF DOD LONG HAUL COMMUNICATIONS, Volume I and II.
5.2.1
Power Sources. The primary electrical power source should be
supplied by a commercial power company. Two independent sources with two
separate feeders are required where they are available and economically
feasible (mission reliability/operational requirements versus cost). If
commercial power sources are unavailable or inadequate, an on-station primary
power plant is required. (Refer to MIL-HDBK-1004/1 for primary and alternate
source selections and load estimation.) Technical equipment power
requirements will be furnished by the project's electronic engineers (SPAWAR).
Design electrical capacity shall be for 100 percent of station demand load.
Spare capacity for a minimum of 25 percent of the total facility load shall be
provided for future growth.
5.2.2
Load Categories. Electronic facility power loads are divided into
categories (see Figure 6) according to function and allowable downtime.
5.2.2.1
Station Load.
The station load is the total power requirement of
the electronic facility.
5.2.2.2
Nonoperational Load. The nonoperational load refers to
administrative, support, and miscellaneous power requirements not essential to
facility operation and does not normally require emergency power.
5.2.2.3
Onerational Load. The operational load is that portion of the load
required to keep the facility in continuous operation. (The sum of the
technical and nontechnical loads.)
5.2.2.4
Nontechnical Load. The nontechnical load is that part of the total
operation load used for general lighting, convenience outlets, air
conditioning, ventilating equipment, and other functions for normal operation
and does not normally require emergency power.
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