Hi Mike,
Welcome to ECN!.
I would be looking at having more than eye and face protection, if I was in a situation where an arc flash could occur.
All that is required to cause an arc fault is say a tool slipping (screwdriver or spanner), or a tool falling onto some live equipment.
If this doesn't help at all, please ask more questions, we have a good knowledge base here.
Cheers,
Mike.