34 Pa. Code § 405.32 – Platforms.

(a) A stage, orchestra or organ console elevator platform shall be comprised of steel frame construction and designed with a safety factor of at least six based on the highest rating of either the rated lifting load or the rated static load uniformly distributed.
(b) When the travel of a stage, orchestra or organ console elevator extends above the top of the shaftway enclosure, the platform shall be equipped with an apron at least as deep as the space between the top of the shaftway enclosure and the underside of the platform when the platform is at its limit of travel.

This section cited in 34 Pa. Code § 405.31 (relating to applicability).