People who have lived through an arc flash explosion will tell you just how powerful the blast can be. Experts say that the heat of the blast is four times hotter than the sun.
You can see for yourself the power of an arc flash is this video captured by a security camera. Here a worker, not wearing the proper PPE, is racking a breaker when an arc flash occurs. http://www.metacafe.co.il/watch/1555440/arc_flash_while_racking_a_breaker/.
Hopefully, the regulations put in place in 2007 by OSHA will prevent arc flash explosions like this one. OSHA, in August 2007 ruling, required employers to do a better job of protecting their employees from arc flashes.
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