From: dh0496@windstream.net   
      
   On 1/25/20 11:24 AM, Grant Taylor wrote:   
   > Is anyone willing to explain Negative 48 Volts DC?   
   >   
   > I'm trying to learn about it because we're using it for a few things at   
   > work and I'd like to better understand what we're working with than   
   > simply going through the motions that someone else dictates.   
   >   
   > I've learned that -48 VDC uses what is called "Positive Ground" and that   
   > what I'm used to is called "Negative Ground".   
   >   
   > I'm trying to correlate and understand the typical red and black wires   
   > with them being ground / return / common / hot / etc.   
   >   
   > I suspect that there is more to it than simply reversing the + and -   
   > lead from a battery or meter.  But I can't wrap my head around it.   
   >   
   > Can ~> will someone offer any comments that might help me understand   
   > better?   
      
          I can't offer any real words of wisdom except to say old tractors   
   and cars used 6 volt positive ground.  There's a little bit here about   
   the disadvantages of that:   
      
      I found that with a search for six volt positive ground.   
      
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