[RE-wrenches] Conductor Sizing for Supply Side Connection

[August Goers]

Jeremy,



Good point. Even under the 2008 NEC 690.64(B)(2) you can install up to a 40
Amp breaker on the load side as long as it is on the opposite side of the
input feed per 690.64(B)(7). Garrison, do you need a 60 A breaker?



I haven't used this product myself, but if the continuous output power is
indeed 4500 W then you'd be fine with a 25 or 30 A breaker.



Best,



August



*From:* re-wrenches-bounces at lists.re-wrenches.org [mailto:
re-wrenches-bounces at lists.re-wrenches.org] *On Behalf Of *All Solar, Inc.
*Sent:* Wednesday, February 27, 2013 1:50 PM
*To:* RE-wrenches
*Subject:* Re: [RE-wrenches] Conductor Sizing for Supply Side Connection



There is an exception in NEC2011 regarding the point of connection. This
may not apply, but you could avoid the supply side.  4500W / 240V = 18.75 x
1.25 = 23.4A, well under the 120% rule. reference 705.12(D)(2)



Jeremy

All Solar

CO,USA

----- Original Message -----

*From:* Garrison Riegel <garrison at solarserviceinc.com>

*To:* 'RE-wrenches' <re-wrenches at lists.re-wrenches.org>

*Sent:* Wednesday, February 27, 2013 2:15 PM

*Subject:* [RE-wrenches] Conductor Sizing for Supply Side Connection



Wrenches,



On an upcoming job we have a Xantrex XW4548 interconnecting with a 200A
service, and I’d very much appreciate some advice if y’all are willing.



Since the inverter output OCPD is required to be 60A we are looking at a
supply side connection, and I have two questions:



1.       Before the point of interconnection the inverter output circuit
will first pass through the XW Power Distribution Panel and inverter
bypass, which is essentially a 60A breaker.  The service disconnect for the
supply side connection will also be fused at 60A.  Does the 120% rule apply
to the conductor between these two OCPDs?  Or since this is a supply side
connection in accordance with 690.64(A), 690.64(B)(2) will not apply? [this
AHJ is on the 2008 NEC]



2.       Can anyone recommend a reliable insulation piercing tap
connector?  Or would you recommend something else entirely for a
residential supply side connection?



Thanks in advance,



Garrison

847-677-0950

Solar Service Inc.




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