UFC 3 -520-01
June 10, 2002
FACILITY-SPECIFIC DESIGN CRITERIA
Apply the following documents for the interior ele ctrical design effort of
AFI 32-1023, Design and Construction Standards and Execution of Facility
Army Engineering Instruction (AEI) , Medical Design Standards.
Department of the Army, Volume 1, Medical Design Guide.
MIL -HDBK-1191, Medical Military Design and Construction Criteria.
NFPA 99, Health Care Facilities.
POWER DISTRIBUTION FOR AIRCRAFT HANGARS (SHELTERS).
Refer to NEC Article 513 (2002 Edition) and NFPA 409, Standard on Aircra ft
Hangars, for design criteria for aircraft hang ars, which is applicable to maintenance,
servicing, and storage hangars; corrosion control hangars; fuel cell repair hangars;
depot overhaul facilities; and all types of aircraft shelters. The following hazardous
location classifications apply to hangars.
18-2.1.1 Any pit or depression below the level of the hangar floor must be classified as
a Class I, Division 1 location, extending up to the floor level.
18-2.1.2 The entire area of the hangar, including any adjacent and communicating
areas not suitably isolated from the hangar, must be classified as a Class I, Division 2
location up to a level of 457 millimeters (18 inches) above the floor.
18-2.1.3 The area within 1.5 meters (5 feet) horizontally from a ircraft power plants or
aircraft fuel tanks must be classified as a Class I, Division 2 location that extends
upward from the floor to a level 1.5 meters (5 feet) above the upper surface of wings
and of engine enclosures.
Adjacent areas in which flammable liquids or vapors are not likely to be
released, such as stock rooms, electrical control rooms, and other similar locations, will
not be classified provided they are adequately ventilated or effectively isolated from the
hangar by walls or partitions.