Oooooo, you're trouble now.....
I'm not going to go on the lecture circuit of arch flash and general electrical safety, but will say that the reasons that can happen under vary quite a bit. AIC rating for tranformer to OCP - OCP to fault distance. Circuit design and impedance. The trip current/time rating of the breaker I believe is this page?: I cant see it.... But may hold several thousand amps for a small amount of time, enough to clear the molten metal out of the path, slowing reaction time.
http://www.geindustrial.com/publibrary/checkout/38652.30055.31248.24184/PDF/GES-9920.pdf Unfortunately ilegible... But can be found here:
http://www.geindustrial.com/publibr...Id=8&pubType=Time%20Current%20Curves Either way, you may have caused significant damage to the wiring between the short, and the breaker, and may have even damaged the breaker to boot. You may have to re-do that run....
