It's a good idea to stand outside the boundary of any arc-flash or arc-blast hazard during first energization of any high-power equipment. Also make sure that

It's a good idea to stand outside the boundary of any arc-flash or arc-blast hazard during first energization of any high-power equipment. Also make sure that your employer provides you appropriate arc-flash protective equipment if you're doing that kind of work. Low voltage, high power systems often have very high arc flash hazard.