UFC 3-600-01
26 September 2006
6-28.2.2.1
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.
6-28.2.2.2
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.
6-28.2.2.2.1 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.
Table 6-1 (Navy and Air Force) Separation distance between outdoor insulated
transformers and buildings
Horizontal Distancea
Fire
Non-
Resistant
Combustible Combustible
Vertical
Liquid Volume Construction Construction Construction Distance
Liquid
gal (m)
ft (m)
ft (m)
ft (m)
ft (m)
Less
<1,000 (3.8)
5 (1.5)
5 (1.5)
25 (7.6)
25 (7.6)
Flammable
>1,000 (3.8)
15 (4.6)
15 (4.6)
50 (15.2)
50 (15.2)
<500 (1.9)
5 (1.5)
15 (4.6)
25 (7.6)
25 (7.6)
Mineral Oil
500 5,000
15 (4.6)
25 (7.6)
50 (15.2)
50 (15.2)
(1.9 19)
>5,000 (19)
25 (7.6)
50 (15.2)
100 (30.5)
100 (30.5)
a
If FM Approved transformers are used, the separation distances must follow the
requirements of FM Global Loss Prevention Data Sheet 5-4, Transformers, which
allows for reduced separation distances.
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