34 Pa. Code § 50.33
Fire door assemblies in vertical openings shall be self-closing, latching, and normally kept closed. Electromagnetic hold open devices may be approved by the Department where all of the following conditions are met:
(4) The electric current will be positively interrupted by one or more of the following methods:
This section cited in 34 Pa. Code § 51.31 (relating to vertical openings); 34 Pa. Code§ 52.31 (relating to vertical openings); 34 Pa. Code § 53.31 (relating to vertical openings); 34 Pa. Code § 54.31 (relating to vertical openings); 34 Pa. Code § 55.31 (relating to vertical openings); 34 Pa. Code § 57.31 (relating to vertical openings); 34 Pa. Code § 58.31 (relating to vertical openings); and 34 Pa. Code § 59.31 (relating to vertical openings).