XPost: alt.engineering.electrical, sci.electronics.design   
   From: jasen@xnet.co.nz   
      
   On 2010-08-08, Jon  wrote:   
   > The electrical service goes to the house.  There are 3 underground 000   
   > cables that go to the barn from the house.  The barn has a 60 amp breaker in   
   > the breaker box at the house.  The 12,000 watt generator is in the barn.  It   
   > has a 50 amp 240vac outlet, a 30 amp 240vac outlet and several others.  I am   
   > hooking the 50 amp outlet to the house.  I am using the same 3 underground   
   > 000 cables to send generator power to the house during a power outage.   
      
   sampe problem same solution.   
      
   > A 90 amp contactor in the barn won't connect the generator to the house   
   > unless:   
   > 1. The electrical service to the house is off, and   
   > 2. The service disconnect switch at the house is off.   
   >   
   > When the generator is turned on, it tests the service disconnect at the   
   > house to assure the above two conditions are met.  This is done by sending a   
   > 1 second electrical pulse to the house to see if it will actuate a coil.  If   
   > the coil actuates, the 90 amp contactor latches open and prevents backfeed   
   > into the grid.   
      
   sounds unlikely to work.   
      
   > If the service power turns on during that 1 second, the   
   > generator power and service power will clash and throw a 50 amp breaker to   
   > the generator.   
      
   if you're lucky.   
      
      
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