From: hornetd@gmail.com   
      
   On Tuesday, April 19, 2016 at 9:08:03 AM UTC-4, Mathias Koerber wrote:   
   > Moin   
   >    
   > My trusty old APC Smart-UPS SU-1500 is still working fine   
   > generally, only that the C13/C14 output jacks in the back   
   > (made from plastic) have become so brittle as to crumble   
   > under the slightest pressure, so that one cannot   
   > plug in anything anymore.   
   >    
   > So I want to try and wire in new sockets. SHould be easy   
   > enough, but:   
   >    
   > After I remove the battery, and of course disconnect it   
   > from mains etc, *and* disconnect the battery-connection   
   > plug/socket safety at the back....   
   >    
   > Could there still be any dangers (large, slow-dissipation)   
   > capacitors lurking inside  that might give me a nasty surprise   
   > (I know camera flashlights are dangerous that way), or should   
   > it be safe after 1-2 days off any power-source?   
   >    
   > thanks   
      
   Much depends on whether or not the engineer who designed it included bleeder   
   resisters to drain the large capacitors.  If you are comfortable working   
   inside the electronics you need only shunt the capacitors out of the circuit   
   by attaching clip leads    
   across the capacitor terminals.  Very large capacitors are shipped with a   
   shorting bar across the terminals so that they cannot build up a charge by   
   exposure to strong electromagnetic fields and then discharge that charge   
   through the first human being    
   who then tries to handle them during storage or installation.     
      
   --    
   Tom Horne   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)