placment of inverter breaker [RE-wrenches]

[Mark Frye]

Darryl,

Looking over the submittals in the Code revision process I can see that
Wiles et. al. attempted to get the change such that you could have PV
backfeed up to the buss bar rating as long as it was at the opposite end and
labeled.  However, there were several objections to this and countervailing
proposals.

As I pointed out in a previous e-mail, we started with a good idea (200%
backfeed if at opposite position), but it got kicked around so bad that all
we were left with is the cr*p (mish-mashy language, 120% max and more
labels).

I am not atempting to speak authoritatively about what transpired in the
process, but I am commenting on a pattern of performance that seems to
emerge upon review.

MPF



-----Original Message-----
From: Mark Frye [mailto:markf at berkeleysolar.com]
Sent: Tuesday, January 15, 2008 10:15 PM
To: RE-wrenches at topica.com
Subject: RE: placment of inverter breaker [RE-wrenches]



Darryl,

The way I read this:

 - The sum of the breakers can never exceed 120 % of the rating of the buss.

 - If the sum of the breakers is less than or equal to the rating of the
panelboard ( 0 to 100%) the breaker may be positioned anywhere on the buss.

 - If the sum of the breakers is greater than the rating of the panelboard
(101 TO 120%), it must be positioned opposite the main and a label affixed.

MPF

-----Original Message-----
From: Darryl Thayer [mailto:daryl_solar at yahoo.com]
Sent: Tuesday, January 15, 2008 6:39 PM
To: re Wrenches
Subject: placment of inverter breaker [RE-wrenches]



HI all
new code 690.64 B7 does this mean that as long as I
have a breaker at the opposite end of the panel board,
I can have a breaker rated at the busbar rating?  Or
just that I must always place my inverter breaker at
the opposite end and the old 20% of busbar applies?
Thanks Darryl


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