[RE-wrenches] sub-panel supply-side tap

[Mark Frye]

Kirk,

You may be doing a tap on the feeder at a point that is on the "supply 
side" of the sub panel, but this is not the same as doing a "supply 
side" connection per 690.49 (A). You are still doing a "load side" 
connection per 690.49 (B).

You still need to look at the size of the feeder breaker and the pv 
breaker together to insure that the feeder has sufficient ampapacity per 
690.49.

Mark Frye

On 6/5/2012 3:44 PM, Kirk Herander wrote:
>
> Hello,
>
> Ideally I'd like to make a supply-side tap on a feeder to a sub-panel. 
> And I mean tapping the feeder line-side of the sub-panels 200 amp 
> breaker. This is due to the limitations of the sub-panels 200 amp 
> buss. My PV system max output is 80 amps and therefore requires a 100 
> amp breaker. A no-go with the 200 amp buss. The 20% allowance won't 
> work and I cannot downsize the 200 amp breaker to make it work due to 
> panel loads. I would have to upgrade the panel to 400 amps. FYI this 
> is 208/120 3 phase.
>
> I have done supply-side connections before but only on a buildings 
> main service. Do all the same rules apply? What might be different I 
> should take into consideration? Thanks.
>
> Kirk Herander
>
> VT Solar, LLC
>
> dba Vermont Solar Engineering
>
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