[RE-wrenches] Conductor Sizing for Supply Side Connection

[All Solar, Inc.]

There is an exception in NEC2011 regarding the point of connection. This may not apply, but you could avoid the supply side.  4500W / 240V = 18.75 x 1.25 = 23.4A, well under the 120% rule. reference 705.12(D)(2)

Jeremy
All Solar
CO,USA
  ----- Original Message ----- 
  From: Garrison Riegel 
  To: 'RE-wrenches' 
  Sent: Wednesday, February 27, 2013 2:15 PM
  Subject: [RE-wrenches] Conductor Sizing for Supply Side Connection


  Wrenches,

   

  On an upcoming job we have a Xantrex XW4548 interconnecting with a 200A service, and I'd very much appreciate some advice if y'all are willing.  

   

  Since the inverter output OCPD is required to be 60A we are looking at a supply side connection, and I have two questions:

   

  1.       Before the point of interconnection the inverter output circuit will first pass through the XW Power Distribution Panel and inverter bypass, which is essentially a 60A breaker.  The service disconnect for the supply side connection will also be fused at 60A.  Does the 120% rule apply to the conductor between these two OCPDs?  Or since this is a supply side connection in accordance with 690.64(A), 690.64(B)(2) will not apply? [this AHJ is on the 2008 NEC]

   

  2.       Can anyone recommend a reliable insulation piercing tap connector?  Or would you recommend something else entirely for a residential supply side connection?

   

  Thanks in advance,

   

  Garrison

  847-677-0950

  Solar Service Inc.

   

   



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