Transformers and transformer vaults (including secondary ties).
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 nonhabitable 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.
[Statutory Authority: Chapter
19.28 RCW, RCW
19.28.031 and
19.28.251. WSR 24-05-085, § 296-46B-450, filed 2/21/24, effective 4/1/24. Statutory Authority: Chapter
19.28 RCW, RCW
19.28.010 and
19.28.031. WSR 17-12-021, § 296-46B-450, filed 5/30/17, effective 7/1/17. Statutory Authority: Chapter
19.28 RCW. WSR 13-03-128, § 296-46B-450, filed 1/22/13, effective 3/1/13. Statutory Authority: RCW
19.28.006,
19.28.010,
19.28.031,
19.28.041,
19.28.061,
19.28.101,
19.28.131,
19.28.161,
19.28.171,
19.28.191,
19.28.201,
19.28.211,
19.28.241,
19.28.251,
19.28.271,
19.28.311,
19.28.321,
19.28.400,
19.28.420,
19.28.490,
19.28.551, 2002 c 249, chapters
34.05 and
19.28 RCW. WSR 03-09-111, § 296-46B-450, filed 4/22/03, effective 5/23/03.]