point of connection [RE-wrenches]

[Mark Frye]

Larry,

Which year NEC are you designing to / being inspected to?
 
Mark Frye
Berkeley Solar Electric Systems
271 Vistamont Dr
Grass Valley CA 95945
(530) 401-8024
www.berkeleysolar.com 

-----Original Message-----
From: Larry Brown, Sunmountain [mailto:sunmountain at netstep.net] 
Sent: Friday, May 02, 2008 10:13 AM
To: RE-wrenches at topica.com
Subject: point of connection [RE-wrenches]


Wrenches,

We are doing an installation with 2 Sunny Boy 5000 inverters each requiring
a 30 amp 2 pole breaker.  The closest point of interconnection is outside
the house on the supply side of the main  
service disconnect near the customer side of the utility meter.   
According to 690.64B on the load side we are limited to 120% of the busbar
rating, which means we could not put 2- 30 amp backfeed breakers in the main
200 amp service panel.  But 690.64A does not state a limitation  of 120% .
So we are considering a 200 amp feed through panel, also recommended by our
local electrical inspector, and then putting our 2-30 amp 2 pole breakers in
this feed thru panel. Anyone have any comments on this method? What other
methods are people using to make a supply side interconnection?

Larry Brown
Sun Mountain


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