mxslick,
While I am not a fan of PVC because of the physical damage issue, I watched the same thing happen to a 4" rigid steel riser with 4 500 kcmil conductors. Both the conduit and the conductors "vaporized".
Don
I share your opinion on the physical damage issue, especially since PVC is much more likely to get damaged by a "love tap" from a passing truck than rigid steel. I'm almost willing to bet that a tap from a truck is waht started the fault in the video.
But to be fair, I will concede that
nothing is gonna stop a fault on a POCO feed from burning through whatever pipe it may be in. Unless through dumb luck the transformer's primary fuse is either weak or was sized to open under a secondary fault.
