[RE-wrenches] NEC 705.12(B)(2)(3)(c) intention

[August Goers]

Right, but if we limit the load breakers to the bus rating per NEC
705.12(B)(2)(3)(c), then there will never be an overcurrent event.



August

*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *Mark Frye
*Sent:* Wednesday, April 19, 2017 4:18 PM
*To:* RE-wrenches <re-wrenches at lists.re-wrenches.org>
*Subject:* Re: [RE-wrenches] NEC 705.12(B)(2)(3)(c) intention



If your sketch shows that there are 200A of breakers in the sub panel and
200A of breakers in the main, then, no, that would not be the intent.  The
lug kit makes the two separate bars into a single bar.

Mark

On 4/19/2017 3:29 PM, August Goers wrote:

Hi Wrenches –



Now that we’re in the 2014 NEC, we’ve increasingly been using the NEC
705.12(B)(2)(3)(c) interconnection method:



[image:
imap://markf@mail.lmi.net:143/fetch%3EUID%3E.Re-Wrenches%3E12200?header=quotebody&part=1.1.2&filename=image001.png]



This is a great way of putting lots of PV on a panel when there are few
loads. As long as the total breaker rating (excluding the supply breaker)
equals the bus rating or less, we’re good to go. However, we recently ran
into a panel that had a lug subfeed kit installed in it.



Do you think the intention of the code is to allow something like shown in
this sketch?





Cheers,



August

Luminalt








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