From: cd@notformail.com   
      
   On Tue, 25 Oct 2022 14:19:38 -0700 (PDT), three_jeeps   
    wrote:   
      
   >On Saturday, October 22, 2022 at 2:34:59 PM UTC-4, Cursitor Doom wrote:   
   >> On Sat, 22 Oct 2022 08:08:25 -0700 (PDT), "Peter W."   
   >>  wrote:   
   >>   
   >> >Did the caps fail Open or Short?   
   >> >   
   >> >Peter Wieck   
   >> >Melrose Park, P   
   >> These are X2 caps and supposed to fail short. However, for whatever   
   >> reason, they both failed open.   
   >   
   >Fail short...really? Why would you want a cap that is across the supply line   
   to fail short? Just to make sure the fuse blows?   
   >It is my understanding that X and Y capacitors experience line spikes, and    
   will endure multiple small breakdowns over the years as a result of this   
   stress. They fail open because local heating caused by a microscopic   
   dielectric breakdown results in    
   polypropylene melting, which seals off the "edge" of the breakdown.   
   >Is this not correct??   
      
   No idea if that's the failure mechanism or not. However, if you read   
   my orginal remark, I did say they are *supposed* to fail short, which   
   makes pretty clear that was the intention of the manufacturer even if   
   they were not successful in many instances.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)