[RE-wrenches] Load Side Tap

Mark Frye markf at berkeleysolar.com
Sun Sep 14 08:30:41 PDT 2014


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
> "Building a Better Future For The Next Generation"
>
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