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Without wanting to sound like I actually understand the physics behind it (I consider myself like [USER=5738]@Valantar[/USER] , a mere back alley illusionist)....


Spontaneous arcing in exposed conductor is indeed voltage dependent.


But this phenomenon of current burning through insulations on the short instance of an electrical connection being made (or even multiple connect and disconnect, like when we wiggle our way in then microscopically connections are made then undone then made and so on until it's finally _really_ made), I just conveniently call arcing as well for lack of my knowledge of better word.


Now this 'arcing', in my observation, is dependent on target input impedance, contact area, max current the supply can provide, and thickness of insulation material between live/lead and its return path.