>> (the unplugging process may need to be repeated a few times until the
capacitor is disconnected when the mains is high at the time of
disconnection and so gets a "decent" charge!) <<


At a former employer, we monitored the wave form with a 'scope, and
repeatedly opened and closed the connection to the power line until
disconnection could be seen to have occurred at (or very near) the
peak of the wave form, then watched the discharge. None of us EVER
felt tempted enough to question the 'scope display and experience
the discharge personally - and we went to some trouble to arrange
things so we would not do.  Anyone who had doubted the necessity
of the test was converted by seeing the "potential" for trouble. 

Cortland

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