(2)Prisoners employed on blasting etc.- Where prisoners are employed on blasting, well sinking excavation or other work of a dangerous nature, every reasonable precaution shall be taken to guard against accidents. In blasting operations, the firing of the charge shall be carried out by some responsible person; in excavation the sides shall be sloped or cut in steps, and in well-sinking, the sides, if not sloped, shall be boarded to prevent them from falling in.