From: hornetd@gmail.com   
      
   On Monday, November 24, 2014 9:12:47 AM UTC-5, J.B. Wood wrote:   
   > Hello, all, and a fuse question for a practicing electrician (or anyone    
   > in the know):   
   >    
   > Assuming a residential branch circuit is fused for 125 volts, 30 amps    
   > and the fuse box accepts the rejection base ("S") fuse, how    
   > interchangeable are the 30 amp "D" dual element time delay (has the    
   > spring loading) and the 30 amp "SL" time delay types?  Thanks for your    
   > time and comment.  Sincerely,   
   > --    
   > J. B. Wood	            e-mail: arl_123234@hotmail.com   
      
   An important question here is what is the load served by this 125V 30 ampere   
   fuse.  Thirty Ampere circuits that are operating at 115V nominal are quite   
   rare.  The only type of load such a circuit should be installed to serve is a   
   load that is wired    
   directly to the branch circuit or a National Electrical Manufacturers   
   Association (NEMA) pattern NEMA 5-30R receptacle.  The minimum wire gauge for   
   such a circuit is American Wire Gauge (AWG) Size Ten copper (10AWG/Cu) or Size   
   Eight Aluminum (8AWG/Al).     
   Neither Fifteen or Twenty ampere receptacles may be installed on such a   
   circuit.  If the circuit is actually a full phase 230V nominal voltage circuit   
   then such a fuse could only be installed in a common operating lever,   
   simultaneous opening, fused    
   switch.  I two such fuses are used to supply a nominal 230 volt circuit from a   
   non switched panel board then the circuit is installed in violation of the   
   listing and labeling of the panel board and thus in violation of the US   
   National Electric Code.     
      
   --   
   Tom   
      
   --- SoupGate-Win32 v1.05   
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