In common power supplies the only example where there might be a problem would   
   be that using choke input. The choke likes to keep the current flowing, so a   
   switch between the rectifiers & the choke input could cause insulation   
   failure. But a switch on    
   the primary side as it normally would be is OK, the choke still has a way to   
   dump stored energy thru the PS transformer wdgs & rectifer.   
      
   But choke input is now uncommon, most PS are cap input.   
      
   In my case I installed the fix I spoke of in a regulated PS with DC standby I   
   built many years ago so that it can be run either in choke or cap input. The   
   max volts or current can then be used to advantage.   
      
   Cheers to all, John L Stewart   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)