Except the electric shock, Arc Flash is the most dangerous risk every electrician must face daily.
Even Dropping an un-insulated tool or a metal part can make a connection and then lead to an Arc-Flash.

Damage caused by Arc-Flash is scary. The temperature of the heat source from Arc-Flash can
reach 20,000 °C. Also, the ultraviolet light, explosion waves, and loud sounds from the Arc-Flash can permanently damage human vision and hearing.