From: phoney@physco.invalid.net   
      
   "J.B. Wood"  wrote in message news:m4vtke$fqi$1@ra.nrl.navy.mil...   
   >   
   >On 11/24/2014 12:47 PM, gfretwell@aol.com wrote:   
   >   
   >> Dual element fuses are usually intended for motor loads. They have an   
   >> instant element that will respond to short circuit faults rated at   
   >> more than the nominal fuse size and a thermal element that will cook   
   >> off if you have a sustained overload. It allows the fuse to sustain   
   >> the start current without blowing but it will let go if that overload   
   >> continues.   
   >> You can go to the Bussman web site and see the curves for the various   
   >> fuses.   
   >>   
   >Hello, and thanks for the detailed follow-up.  All this started because the   
   >S-type 30 Amp plug fuse (with the internal spring) blew (I had a   
   >shorted-out lamp fixture).  My local hardware store only had the SL 30 amp   
   >S-type and substituting that appears to work but judging from your comment   
   >it may be subject to blowing more quickly than the original given certain   
   >conditions.  Sincerely,   
   >   
   You should not be using a 30 amp circuit for general lighting. Reason, lamp   
   fixture cords can easily burn and start a fire before that fuse blows.   
   15 amp is recommended for general lighting circuits.   
   If you have motors on your 30 amp circuit, you should replace that present   
   fuse with a delayed one (30amp), if it blows.   
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