ETL 1110-3-412
20 Oct 89
Transformer vaults will be located on the exterior wall of
the building, vented to the outside and accessible only from
outside the building under normal design conditions.
Air intake fan and louvers of HVAC systems will be
interlocked with the smoke and rate-of-rise detector in the
transformer vault and/or vault rooms. The smoke and rate-of-rise
detectors will shut down the HVAC air intake if a fire occurred
in the transformer vault and/or vault rooms. This is not
necessary if the HVAC intake is located on the roof or the
opposite side of the building. A sign will be posted on the
access doors to a transformer vault which indicates the
appropriate firefighting equipment and procedures.
OUTDOOR APPLICATION
The outdoor application of mineral oil filled transformers
will comply with MIL-HDBK-1008, "Fire Protection For Facilities
Engineering Design and Construction," "National Electrical Safety
Code" (ANSI-C2), and pertinent EPA regulations.
Mineral oil 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.
(b)
High Fire-Point Transformer Dielectrics:
INDOOR APPLICATION
The indoor application of high-fire-point dielectric filled
transformer will comply with the "National Fire Protection Code,"
National Electrical Code," MIL-HDBK-1008, "Fire Protection For
Facilities Engineering Design and Construction" and the "National
Electrical Safety Code."
Transformer vaults will be located on the exterior wall of
the building, vented to the outside and accessible only from
outside the building under normal design conditions.
Air intake fan and louvers of HVAC systems will be
interlocked with the smoke and rate-of-rise detector in the
transformer vault and/or vault rooms. The smoke and rate-of-rise
detectors will shut down the HVAC air intake if a fire occurred
in the transformer vault and/or vault rooms. This is not
necessary if the HVAC intake is located on the roof or the
opposite side of the building. A sign will be posted on the
access doors to a transformer vault which indicates the
appropriate firefighting equipment and procedures.
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