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
NABCEP^TM Certified installer Charter Member
NYSERDA-eligible Installer
VT RE Incentive Program Partner
802.863.1202
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