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On the other hand, working on a high-voltage machine involves a very serious risk of an arc flash, so a category 4 rated PPE is likely going to be needed in this case.

Five Important Things to Know About Arc Flash PPE Programs ... in risk assessments and are grouped into four categories: task demands, work environment, individual capabilities, and human nature ...

Face shields are to have wrap-around guarding to protect not only the face but also the forehead, ears, and neck or, alternatively, an arc–rated arc flash suit hood is required to be worn. Arc rating is defined in Article 100 and can be either ATPV or EBT.