Mich. Admin. Code R. 408.41401
Rule 1401. This part applies to the construction, modification, and major repair of tunnels, shafts, caissons, chambers, passageways, cofferdams, any other aspect of tunnel construction, and the use and maintenance of equipment. This part does not apply to routine maintenance of an existing structure; excavation and trenching operations as prescribed by Construction Safety Standard Part 9 "Excavation, Trenching and Shoring," which is referenced in R 408.41410, or underground electrical transmission and distribution lines as prescribed in Construction Safety Standard Part 16 "Power Transmission and Distribution," which is referenced in R 408.41410. This part also applies to cut-and-cover excavations which are both physically connected to ongoing underground construction operations within the scope of this part and covered in such a manner as to create conditions characteristic of underground construction.
Mich. Admin. Code R. 408.41401