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 MIL-HDBK-1012/1
5.2.3.5
Foreign Power. Equipment and facilities to be operated in foreign
countries shall be designed with the aforementioned power characteristics. If
frequency conversion is required because of foreign power characteristics, a
synchronous generator or solid state converter may be used. The input
requirements and output capacity should be determined by the power available
and the requirements of the equipment to be connected. Consideration should
be given to standby requirements and location of the frequency conversion
equipment. Generally, the frequency conversion equipment should be as close
as feasible to the equipment being served.
5.2.4
Emergency Power. Emergency power systems (Class C, as defined in
MIL-HDBK-411) enable restoration of power to the operational load within 10 to
60 seconds and provide power during short-term outages. These systems
generally consist of a number of engine-driven generator sets and automatic
transfer equipment. Emergency power system shall conform to MIL-HDBK-1004/1
and MIL-HDBK-411, and shall be designed to provide continuity of power during
transfer from emergency source to primary source. Emergency power systems
shall be capable of carrying 100 percent of the operational load as shown in
Figure 6. The emergency power systems shall be rated at least 1.5 times the
output rating of the UPS. For emergency power requirements in security areas,
refer to Section 6 of this manual.
5.2.5
Uninterruptible Power Sources (UPS). UPS (also referred to as no-
break power or Class D auxiliary power) use stored energy to provide
continuous power within specified voltages and frequency tolerances. UPS
shall be provided for all critical technical loads. UPS systems will be
government furnished. The installation shall be in accordance with MIL-HDBK-
1004/1 and herein specified.
5.2.6
Special Power Requirements
5.2.6.1
400-Hz Power. Electronic facilities often require that power be
supplied to equipment at a frequency of 400 hz. Two types of frequency
conversion equipment are available: motor generators and static converters.
The type and capacity of the units should be determined by the requirements of
the equipment. Consideration should be given to standby requirements when
selecting and locating frequency converters. Both types of converters must be
adequately grounded to prevent electromagnetic interference. Power at 400 hz
requires that the distribution system be carefully engineered. Consider the
use of larger size conductors, parallel feeders, non-magnetic conduits and
load drop compensators. All cables carrying 400-hz power shall be run in
separate raceway systems. For further information, refer to NAVFAC DM-4.05,
400 HZ Generation and Distribution Systems.
Direct-Current Power Systems. Electronic facilities often require
5.2.6.2
several direct-current power supplies and distribution systems. The systems
usually operate at 24 or 48 volts., These voltage supplies are normally
furnished by SPAWAR, along with the electronic equipment they serve.
5.2.7
Power Conditioning. At electronic facilities, it is possible for
classified information from processing devices to be inductively coupled into
power lines; consequently, power distribution conductors entering areas where
classified information is processed may need to be filtered at the area
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