34 Pa. Code § 7.174
Plans and specifications for power-operated special industrial service elevators shall be filed with the Department and an erection permit secured in accordance with § 7.31 (relating to submission and approval of plans) and section 11 of the act of May 2, 1929 (P. L. 1518, No. 452) (35 P. S. § 1351), before the work of installation is started. On the completion of the elevators, they shall be inspected and tested by the Department and not placed in regular operation until the Department issues a certificate of operation. The elevator shall be subject to reinspection at least once every 6 months, in accordance with §§ 7.15 and 7.16 (relating to inspection; and inspectors) and the act of May 2, 1929 (P. L. 1518, No. 452) (35 P. S. § 1347).
34 Pa. Code § 7.174