UFC 3-600-01
26 September 2006
Table 6-2 (Army) Separation distance between outdoor insulated transformers
and buildings
Horizontal Distancea
Fire
Non-
Transformer
Resistant
Combustible Combustible
Vertical
Rating
Construction Construction Construction
Distance
Liquid
kVA
ft (m)
ft (m)
ft (m)
ft (m)
Less
<2000
5 (1.5)
5 (1.5)
25 (7.6)
25 (7.6)
Flammable
>2000
15 (4.6)
15 (4.6)
50 (15.2)
50 (15.2)
Mineral Oil
<1000
5 (1.5)
15 (4.6)
25 (7.6)
25 (7.6)
(transformers
made after 1970
except zigzag-
>1000
15 (4.6)
25 (7.6)
50 (15.2)
50 (15.2)
type)
<650
5 (1.5)
15 (4.6)
25 (7.6)
25 (7.6)
Mineral Oil
650 6500
15 (4.6)
25 (7.6)
50 (15.2)
50 (15.2)
(transformers
made before
1970 & zigzag-
>6500
25 (7.6)
50 (15.2)
100 (30.5)
100 (30.5)
type)
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.
6-28.2.2.2.1.1
When the separation distance in Table 6-1 or Table 6-2
cannot be met, the following applies:
There must be no window openings in first story walls within a
horizontal distance of 3 m (10 feet) from the transformers. Existing
window openings must be closed using brick or concrete block.
Window openings in the first story beyond 3 m (10 ft) and up to the
distance required in Table 6-1 or Table 6-2 horizontally from the
transformers must be protected, using either wired glass in steel
sash or glass block.
Window openings in second and third story walls directly above the
transformers must be protected using either wired glass in steel
sash or glass block.
Overhanging eaves, where they exist, must be noncombustible.
6-28.2.2.2.1.2
Equipment Separation Distance.
The separation distance between other equipment (including adjacent
transformers) must be as indicated in Table 6-3 (For Navy and Air Force) or
Table 6-4 (for Army)
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