Indiana Code - Labor and Safety - Title 22, Section 22-10-10-2

Transformers; construction of building; underground storage

Sec. 2. (a) Unless surface transformers are isolated by elevation
(eight (8) feet or more above the ground), they shall be enclosed in
a transformer house or surrounded by a suitable fence at least six (6)
feet high. If the enclosure or fence is of metal, it shall be grounded
effectively. The gate or door to the enclosure shall be kept locked at
all times, unless authorized persons are present.
(b) Surface transformers containing flammable oil and installed
where they present a fire hazard shall be provided with means to
drain or to confine the oil in event of rupture of the transformer
casing.
(c) All transformers ordered after March 8, 1955, for use
underground shall be air cooled or filled with noninflammable liquid
or inert gas.
(d) Suitable danger signs shall be posted conspicuously at all
transformer stations on the surface and underground.
(e) All transformer stations on the surface and underground shall
be kept free of nonessential combustible materials and refuse.
(Formerly: Acts 1955, c.168, s.69.) As amended by P.L.144-1986,
SEC.186.

Last modified: May 27, 2006