Comment by hajile

Last I checked, one of the biggest causes of arc-flash deaths were linemen turning off the lines and someone turned on a generator in response to the power being off and back-feeding the power through the lines because they didn't use a transfer switch.

I got lit up by 277/480 when I worked as an electrician because someone removed a lockout and turned on the breaker.

In any case, not all jobs can have the power turned off.