On October 10, 2010 three electrical contractor employees working at the Martin Marietta Mine in Snyder, OK were arc flashed installing ground fault indicator lights on a live 800 AMP breaker. From the MSHA report, all three workers were transported to the hospital and one died two days later. Most of the arc flash fatalities are from ignition of clothing in the arc flash. Companies should include the need for tested, arc rated clothing in the arc flash training portion of their electrical safety training. Written electrical safety programs require hazard assessment including arc flash hazards.
MSHA requires following NFPA 70E, Standard for Electrical Safety in the Workplace. Most of these types of injuries and fatalities are avoidable.