From: jeroen@nospam.please   
      
   John Larkin wrote:   
   > On Sun, 19 May 2019 22:33:00 -0000 (UTC), Cursitor Doom   
   >  wrote:   
   >   
   >> On Sun, 19 May 2019 14:01:19 -0700, John Larkin wrote:   
   >>   
   >>> Big oil or film metal-can energy-storage caps are usually shipped with a   
   >>> bunch of bare wire shorting the screw terminals. This prevents killing   
   >>> customers.   
   >> Those are typically quite low F value caps, though. Not much energy can   
   >> be stored in them. In any case, why not just send them out uncharged?   
   >> Seems the obvious thing. :-/   
   >   
   > A serious energy storage cap can store kilojoules, or 10s of kJ. 10   
   > joules is considered to be leathally dangerous in some places.   
   >   
   > Discharging 100 joules is an impressive event.   
   >   
      
   There are some effects that cause capacitors to develop   
   bothersome charge even after having been discharged.   
   One is dielectric absorption, sort of like charge hiding   
   away in nooks and crannies for a while, before coming out   
   again when you least want it. Another is the slow   
   accumulation of stray free charge. That's probably self-   
   limiting.   
      
   Anyway, it's safer to ship big capacitors shorted. I've   
   had some nasty surprises in cases where this wasn't done.   
      
   Jeroen Belleman   
      
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