An FD to the south of us had a LODD (Line Of Duty Death) of a Deputy Chief investigating an alarm at a shopping mall. Turns out the mall went into alarm because of a "brownout" D/T a dropped phase... unknown cause. After returning the engines, the Chief went into the panel room with the site electrician and an "engineer" for the property. They were discussing the situation when a) either the faulted UG line re-energized after OCP reset or b) the contractor digging 1 1/2 miles away struck the other phase and caused the short to fault at the point of least resistance - the panel for the mall. The arc flash and molten metal nailed him and the engineer.

IIRC, 2 & 3rd degree burns over something like 80-90% of his body surface. He was concious after the incident, and directed the crews responding to take care of the other victim before him. They knocked him out at the hospital - he lived for about a week after the incident. He wasn't wearing turnouts (Nomex FR) because he'd determined that there wasn't a fire on location, and was only 'investigating'.

Admittedly, a rare situation, but I noticed a lot less joking about my "other" job at the FD after the incident...