WAC 296-46B-450
Equipment for general use -- Transformers
and transformer vaults.
027 Flammable-liquid or oil-filled transformers installed
outdoors.
(1) Flammable-liquid or oil-filled transformers installed
outdoors must meet the following requirements:
(a) A transformer installed adjacent to a
building/structure with any combustible surface may be located
only in the shaded "Approved Transformer Area" shown in Figure
450-1;
"Approved Transformer Area" shown in Figure 450-1;
(b) A transformer installed adjacent to a
building/structure with no combustible surface(s) may be
located only in the shaded "Approved Transformer Area" shown
in Figure 450-2;
(c) In an area in which a transformer is to be installed
next to a noninhabited structure, the transformer may be no
closer than two feet to the building/structure and must be
outside a line extended vertically from the ends of the eaves
or rooflines;
(d) A building/structure may have no doors, windows,
stairways, or other openings closer than eight feet to the
transformer;
(e) The finished grade at the location of the transformer
must be such that any oil leaking from the transformer will
flow away from the building/structure and will not pool; and
(f) If transformers are installed in areas subject to
traffic other than pedestrian traffic, they must be provided
with adequate guarding.
(2) Enclosures for total underground flammable-liquid or
oil-filled transformers must not be located within eight feet
of a doorway, operable window, stairways or fire escape.
Adequate space must be maintained above the enclosure so that
a boom may be used to lift the transformer from the enclosure.
