Quote:
Originally Posted by Kevin Kuehn
Agree it's best to error on the safe side. However my gut feeling is you'd be hard pressed to heat up an area of a CRT through conduction of it's dag coating, considering the typical resistance of the material and it's low thermal mass. Might be a fun youtube experiment.  |
It's not conductive heating of the dag at all. An arc essentially forms a super heated conductive plasma in the air to carry current. If you've ever experimented with high voltage arcs (like a Jacob's ladder or a plasma speaker or an automotive spark ignition system) you know that an arc generates enough heat to easily light paper, a cigarette, gasoline, and even burn/erode metal.
If you put your finger in the middle of a 20KV arc and you are not connected to either supply pole you will feel more pain from the plasma burn than the shock (as I know first hand).