UFC 3 -520-01
June 10, 2002
EMERGENCY AND STANDBY POWER SYSTEMS
ESTABLISHING THE NEED FOR BACKUP POWER.
Establishing the need for backup power can be a challenging process with
many decision points. First, determine what loads or facilities need to continue to
function following a loss of normal power. Then, evaluate which loads must be
uninterruptible, can experience momentary power loss, or can experience a longer
duration power loss. Even the types of power disturbances that might be anticipated
have to be considered in the selection of a backup power system. The following
industry documents provide useful background information regarding how to determine
which loads require backup power and should be reviewed as part of a backup power
AFI 32-1063, Electric Powe r Systems--authorizes the use of emergency generators
and related wiring systems when needed to support certain essential functions.
IEEE 446, IEEE Recommended Practice for Emergency and Standby Power
Systems for Industrial and Commercial Applications (IEEE Orange Book)--provides
a detailed discussion of how to evaluate the need for backup power.
MIL -HDBK-1003/11, Diesel-Electric Generating Plants--provides specific guidance
related to satisfying backup power needs.
MIL -HDBK-1190B, Facility Planning and Design Guide--provides authorization for
emergency power for various applications.
NFPA 110, Emergency and Standby Power Systems--provides specific criteria for
backup power systems.
NFPA 111, Stored Electrical Energy Emergency and Standby Power Systems--
establishes the NFPA requirements associated with backup power systems.
The following are examples of military facilities or functions that have been
provided with at least one source of backup power:
13-1.2.1 Operational facilities--typical facilities include air traffic control towers, central
fire stations, communications facilities, command and control facilities, munitions
facilities, weapons systems, and security facilities.
13-1.2.2 Maintenance and production facilities--for quality process contro l, fail-safe
shutdown, security, and safety.
13-1.2.3 Hospitals--for life safety.