Quote:
Originally Posted by allan
On the topic of charged capacitors.. a good circuit will have a bleed resistor and a poor circuit will not.
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The good new is that due to the inferior nature of the electrolytic capacitor, its self leakage is relatively high.
Most electrolytic caps of of less than 1000uF capacity charged to a relatively high voltage on the input side of a switch-mode psu self discharge relatively quickly when the power is off, over 10's of minutes, even with no bleeder resistors present.
So provided the engineer doesn't switch off the power & dive in within seconds they are ok.
All engineers working on any high voltage & higher energy storage equipment should be encouraged to switch the apparatus off. Go and have a cup of tea and a biscuit and come back to it in 15 or 20 minutes. The best occupational health and safety advice available today.