UFC 3-600-01
26 September 2006
Table 6-3 (Navy and Air Force) separation distance between
outdoor fluid insulated transformers and equipment (including
other transformers)
Fluid Volume
Distance
Liquid
gal (m)
ft (m)
Less Flammable
<1,000 (3.8)
5 (1.5)
>1,000 (3.8)
25 (7.6)
Mineral Oil
<500 (1.9)
5 (1.5)
500 5,000 (1.9 19)
25 (7.6)
>5,000 (19)
50 (15.2)
Table 6-4 (Army) separation distance between outdoor fluid
insulated transformers and equipment (including other
transformers)
Transformer Rating
Distance
Liquid
kVA
ft (m)
Less Flammable
<2000
5 (1.5)
>2000
25 (7.6)
Mineral Oil
<1,000
5 (1.5)
(transformers made after
>1000
25 (7.6)
1970, except zigzag-type)
<650
5 (1.5)
Mineral Oil
650 6500
25 (7.6)
(transformers made before
1970 & zigzag-type)
>6500
50 (15.2)
6-28.2.2.2.2 Fire Barriers.
Fire barriers must be of concrete block or reinforced concrete construction
adequate for 2-hour fire resistance.
6-28.2.2.2.2.1
Buildings.
6-28.2.2.2.2.1.1
When building walls are used for protection, the exposed
wall must extend the horizontal and vertical distances from the transformer
specified in Table 6-1 or Table 6-2.
6-28.2.2.2.2.1.2
Roofs exposed to mineral oil insulated transformers must be
Class A rated for the exposed area. The exposed area is considered to be the
following:
5,000 gallons) of mineral oil where roofs are less than 7.76 m (25 ft)
high.
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