Here is that link to a nice jacobs ladder happening on one phase of a disconnect. This looks to be 33kV to 45kV, on a tall cement pole. Video starts with a phase-to-phase arc, quickly extinguished by an upstream reconnect. You can then see the persistant arc forming between the red-hot elements of the disconnect switch. A breeze blows the arc out to several feet long, this happening over and over again. Finally the arc rises up to the phase above it and there is a phase-to-phase flashover and shower of sparks. Great stuff. Much though I am impressed with our members and their Tesla coils, I still believe the ultilties have us all licked when it comes to impressive arcing, super jacobs ladders and long sparks!!
On another note, I see that most of these Youtube videos, done by regular people in the right place at the right time, the blame goes to "exploding transformers". Whenever there is a ground or phase to phase fault, locals blame it on exploding transformers. Rarely have I ever seen or known a pole-pig to explode...ocassionaly there might be a bad bushing or a flashover caused by a sweet little squirrel, but pole-pigs are usually well protected by expulsion fuses which would blow before the pig...