From: whit3rd@gmail.com   
      
   On Sunday, June 4, 2023 at 9:50:55 PM UTC-4, bob prohaska wrote:   
   > I've been given a collection of residential service panel breakers    
   > and would like to check them to see if they trip correctly. They    
   > were in use before I got them, so they certainly close correctly,    
   > but it's unknown if they trip correctly.    
   >    
      
   If they're thermal breakers, the only part that can fail while retaining   
   the on/off function is a heater.   A welder intended to melt metal   
   applied to a heater is... maybe not a test that should be applied.   
      
   The heater, if it fails open, won't let the breaker pass current.   
   If it fails closed circuit... there's extra metal inside the breaker?   
      
   Circuit breakers should, and generally do, fail in safe ways.   
   Go ahead and use them without applying a stress test beyond normal   
   currents and voltages.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)