Max,
Don't do the tap alone, you would be overdriving the subpanel. You would
need 200A of OCP somewhere between the tap and sub panel loads. Convert
the MOL to a 200A Main Breaker or install a 200A fused disconnect
between the tap and the MLO subpanel.
Mark Frye
Berkeley Solar Electric Systems
On 9/13/2014 3:40 PM, Max Balchowsky wrote:
Fellow wrenches, I've got an install that is a little different than
any I've done before. We are going to put an 18 Kw groundmount on the
side of a hill (nothing new so far).
The Array will be about 150 feet from a 200 amp MLO subpanel in the
garage of a guest house. Still nothing new. The sub panel is 500 ft
from the 400 amp main service. The 200 amp sub feed is 250 MCM. There
is not much load on the 200 amp sub panel. The twist on this one is
this, there is a pull box in the vicinity of the proposed array
location. It contains the feed from the House Main (250 MCM) It simply
loops thru the box, I'm sure because of the length of the run. We are
400 feet from the main 400 amp panel and about 100 ft from the 200 amp
sub panel. My thoughts are to tap the 250 MCM in the pull box to back
feed the subfeed to the Main. The other option is to pull wire from
the pull box to the sub panel and land a breaker for the 95 amp feed
from the array. Any thoughts??
Max Balchowsky
Design Engineer
SEE Systems
1048 Irvine Ave Suite 217
Newport Beach, Ca. 92660
760-403-6810
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