Last manhole I was in we wore low calorie, disposable suits, hardhats, and safety glasses.
No exposed live bits and no switching activities. 25 KV cables and HV transformers.
Confined space rules were higher on our list of concerns but I did not touch anything with HV under the insulation.
From an E70 perspective I am not even sure that pulling cable is an activity that requires arc flash protection but I would never wear synthetic clothing in a vault.
