I was not able to find documentation regarding the specific PPE for safe handling and testing of post-tensioning cables. However, here is some general guidance regarding PPE for electrical work.

Employees working in areas where there are potential electrical hazards must be provided with appropriate electrical protective equipment for the specific parts of the body to be protected and the work to be performed, and employers must ensure that they use such equipment. This includes nonconductive head protection wherever there is a danger of head injury from electric shock or burns due to contact with exposed energized parts, and protective equipment for the eyes or face wherever there is danger of injury to the eyes or face from electric arcs or flashes or from flying objects resulting from electrical explosion. Insulated tools or handling equipment must be used when working near exposed energized conductors or circuit parts. Fuse handling equipment, insulated for the circuit voltage, must be used to remove or install fuses when the fuse terminals are energized. [1] [1] [1] [1] [1]