34 Pa. Code § 41.82
(a)Number required. In all industries (except those industries in which Department regulations already provide for a larger installation), if the worker is exposed to heat, humidity, or dust, there shall be provided for every 50 workers, or fractional part thereof, one shower bath with an ample supply of hot and cold water. For every additional 50 workers, or fractional part thereof, at least one additional shower bath shall be provided.
This section cited in 34 Pa. Code § 41.132 (relating to shower baths).