45d4fdd1   
   XPost: sci.electronics.design   
   From: ehsjr@nospamverizon.net   
      
   Mark wrote:   
   >>>As I see it, with this system power will not ever be fed back into the   
   >>>grid, anytime there is power at the "service" terminal the generator   
   >>>will be disconnected by the NC contacts and the ignition will be   
   >>>killed by the NO contacts...   
   >>   
   >>Wrong. It will feed power back to the grid *EVERY* time the grid power   
   >>is restored with the mains switch still on and the genset running.   
   >   
   >   
   > The generator cannot be started and will not run whenever the main   
   > switch is on.   
      
   Of course it can.  Utility power drops, the "killing" relay   
   drops, the genset starts.  Some amount of time later it   
   comes up to speed, and depending on his hairbrained wiring,   
   the relay energizes from the generator produced power. Relays   
   do not transfer instantaneously. It takes time for the relay   
   contacts to move.  During the time that the N/C contacts remain   
   closed, generator power is fed out through the mains breaker to   
   the grid.  Again, that contradicts you contention that generator   
   power is "not ever" connected to the grid. Some number of   
   miliseconds after that the N/O contact makes, which  kills the   
   genset.   
      
   Or, if there is a defect, the relay does not kill the genset.   
      
      
   > The generator cannot be started and will not run whenever there is   
   > grid power at the service terminal.   
      
   The point that was made addressed grid power at the service panel   
   transitioning from off to on. You snipped the following:   
      
   ***begin quote***   
   When the mains power is restored, it will take some period of time   
   for the relay to move the contacts off of the N/C position.  During   
   that brief period the genset will be connected to the grid.  That   
   period, no matter how brief, contradicts "not ever".   
   ***end quote***   
      
   Transfer equipment must be 100% fail safe. It must ensure that   
   the genset is never ever connected to the grid. Not for 1 second.   
   Not for 1 milisecond. Not for 1 microsecond. Not for 1 nanosecond.   
   NEVER.   
      
   His proposed circuit is not only NOT fail safe, it is highly failure   
   prone, AND it can connect the genset, however briefly, to the grid   
   even if the circuit has no failure, as discussed above.  It fails,   
   even with no bad components, because the design is wrong.   
      
   Ed   
      
      
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   > Mark   
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