ETL 1110-3-412
20 Oct 89
Dry type transformers will be sited to preclude any
reasonable chance that products of combustion from a transformer
fire will be drawned into the buildings HVAC system.
OUTDOOR APPLICATION
Open dry type transformers will not be used outdoor.
Closed dry type transformers may be used outdoors if housed
in approved enclosure.
Sealed dry type transformers may be used outdoor if
sheltered from the elements.
Cast coil type transformers may be used outdoor with
approved housing/enclosure.
The outdoor application of dry type transformers will comply
with MIL-HDBK-1008, "Fire Protection For Facilities Engineering
Design and "National Electrical Safety Code" (ANSI-C2) , and
pertinent EPA regulations.
Dry type transformers will be sited to preclude any
reasonable chance that products of combustion from a transformer
fire will be drawned into the HVAC air intake of adjacent
building.
Rehabilitation of Existing Facilities.
b.
(1) For facilities, where the dielectric of
existing indoor transformers and capacitors are EPA and/or NIOSH
listed as a hazardous chemical [ Askarel (PCB)
Tetrachloroethylene, and Freon 113] the following will be
observed:
(a)
The dielectric will be verified.
(b)
A cost-risk analysis for each structure
will be made.
(c) Where the cost-risk analysis requires
elimination of the risk, retrofitting of transformers and
capacitors will be specified in-lieu-of retrofilling.
(d) For those facilities which are mandatory
for national security, the cost-risk analysis indicates
elimination of the risk.
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