Quantcast Location of Outdoor Oil-Insulated Transformers

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MIL-HDBK-1008B
combustion engines, gas turbines, generators, and transformers are covered in
the NFPA Fire Protection Handbook and the FM Loss Prevention Data Sheets.
3.2.2
Stationary Combustion Engines, Gas Turbines, and Generators.
Installation of internal combustion engines, gas turbines, and generators
shall follow the requirements of NFPA 37, Installation and Use of Stationary
Combustion Engines and Gas Turbines, except as modified herein.
3.2.2.1
Units Under 25,000 Horsepower (18.65 MW).  In buildings without
automatic sprinkler protection, enclose these units with 2-hour fire resistive
construction or protect locally with automatic sprinklers.  Automatic
sprinklers connected to domestic water supplies are acceptable in accordance
with NFPA 13.
3.2.2.2
Units 25,000 Horsepower and Larger (18.65 MW).  In buildings without
automatic sprinkler protection, enclose with 2-hour fire resistive
construction and protect locally with automatic sprinklers.  Automatic
sprinklers connected to domestic water supplies are acceptable in accordance
with NFPA 13.
3.2.3
Transformers
3.2.3.1
Requirements.  Transformers shall be installed and located in
accordance with NFPA 70, except as modified herein.
3.2.3.2
Outdoor Oil-Insulated Transformers.  Table 3.2.3.2 provides fire
protection requirements for single-phase or poly-phase outdoor oil-insulated
transformers.
3.2.3.2.1 Location of Outdoor Oil-Insulated Transformers.  Buildings located
25 feet (8 m) or more from an oil-insulated transformer do not require fire
exposure protection.  Buildings within 25 feet (8 m) of a transformer require
exposure protection by one of the following methods:
a)
Protect transformers with a permanently piped water spray
system.
b)  Where transformers expose only one building of masonry or
concrete construction, the following safeguards shall be provided where
applicable:
(1)  There shall be no window openings in first story walls
within a horizontal distance of 10 feet (3 m) from the transformers.  Existing
window openings shall be closed using brick or concrete block.
(2)  Window openings in the first story beyond 10 feet (3 m) and
up to 25 feet (7.5 m) horizontally from the transformers shall be protected,
using either wired glass in steel sash or glass block.
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