UFC 3-600-01
17 April 2003
with change 16 January 2004
connected to domestic water supplies are acceptable in accordance with NFPA
13.
6-27.2
Transformers.
6-27.2.1
Indoor Transformers. Indoor transformers must be installed and
located in accordance with NFPA 70, National Electrical Code.
6-27.2.2
Outdoor Transformers. Outdoor Transformers must be installed
and located in accordance with NFPA 70; ANSI/IEEE C2 National Electrical
Safety Code; ANSI/IEEE 979, Guide for Substation Fire Protection; and
ANSI/IEEE C57.12 series standards for transformers except as modified by this
UFC.
Where transformers are located on or above noncombustible roofs,
suitable curbed and drained concrete mats or welded steel plates
must be underneath units and located so as not to expose roof
structures.
Oil Filled transformers must no be installed on combustible roofs.
6-27.2.2.1 Outdoor Transformers Greater than 10,000KVA. For
transformers 10,000KVA and greater see FM Global Data Sheet 5-4,
Transformers; NFPA 850, Fire Protection for Electric Generating Plants and High
Voltage Direct Current Converter Stations; and ANSI/IEEE 979, for additional
guidance.
6-27.2.2.2 Outdoor Liquid-Insulated Transformers. Buildings or equipment
exposed by outdoor transformers must be protected by separation, a fire barrier,
or a water spray system on the transformers.
Note: The potential exposures from the insulating fluid pose the
greatest risk for buildings and adjacent transformers.
6-27.2.2.2.1 Building Separation Distance. The separation distance between
buildings and transformers must be as indicated in Table 6-1 (for Navy and Air
Force) or Table 6-2 (for Army). The horizontal distance is measured from the
transformer to the building.
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