On 30 Oct, 23:58, wrote:

He was wrong. * The capacitor incorporates a drain resistor which
discharges it in an hour or so.

He is correct. Drain resistances do fail!


I had one of those fail when I was a student. It was impractical to
have the drain resistor permanently connected, so it was on a spring
contact that only engaged when the big power went off (and there were
case & room interlocks too).

However the resistor, a big wirewound, failed by overheating one day,
just from the energy stored in the capacitor bank. _Big_ capacitor.