34 Pa. Code § 5.93 - Lighting
(a) Open or naked
lights-such as lanterns, stoves, torches and the like-are not allowed in rooms
or portions of plants, except for necessary repairs under proper supervision.
Watchmen or others using portable lights shall be supplied with vapor-proof
lights.
(b) The rooms or portions
of plants shall be lighted, if artificial light is needed, by means of an
electric system installed in conduit or in lead encased cables with vapor-proof
keyless lamps. Switches or fuses shall be located away from the rooms or
buildings in a protected place. It is preferable that lights be projected by
reflectors into rooms from the outside through properly located windows. The
use of electric motors other than the sparkless induction type is
forbidden.
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