Hi Dick,
Thanks for the suggestion. I will run the concept by the SMA tech
people. I did use the SMA spec sheets in sizing the wiring, but
maybe opening the relays creates fault current at a voltage that will
jump the gap.
Drake
At 10:50 PM 6/4/2009, you wrote:
Hi Drake,
I'm sending you
Hi Drake,
Up to now, like you, we've been using the SMA DATA SHEETS
(the glitzy ones with the color graphics) to size our wiring and
breakers. But, those sheets make no mention of a
MAXIMUM OUTPUT FAULT CURRENT.
MAXIMUM OUTPUT FAULT CURRENT is specified only in the very last pages
of the
Dick,
Thanks for your take on this.
The problem I see with using the existing AC/DC system GE for the PV GE is
that the EGC will run in parallel with it, separate, but connected at each
end (at the array and at the GE). This could set up a ground loop and still
leaves the electronic imperiled.
I
Wrenches,
Aside from the fact that Chinese solar cells are being assembled all over
the world into modules with varying degrees of quality, what specific
Chinese brand solar modules do you use based on them meeting their stated
physical and electrical specifications, construction, durability,
Kelly,
If I read you right you are talking about two different things. The EGC
running with the PV DC circuit conductors are just that, EGC's and are
sized to the largest PV DC conductor. Applying 690.47D to these conductors
is incorrect.
There is a conductor running from the inverters to the
Rick,
I don't see that applying to Kelly's question.
He said that the AHJ is not requiring the separate array grounding in his
case. The discussion has to do with the number and sizing of conductors run
in various parts of the system in order to accomplish various grounding
requirements.
Mark
Kelly,
The question is, if the AJH had required you to run the new array DC GED
directly to an additional DC array GE, would that new DC GE system need to
be bonded with the exisitng AC GE system with a bonding wire other than the
new EGC running from the array to new DC GE?
Unfortunately, NEC
Thanks Kelly,
I haven't gotten the handbook, but I think I am getting the picture.
How nice of the handbook to let us know that the new GE and GEC that shall
be installed according to 690.47D is nothing more than an optional
supplementary ground electrode. And furher, if you do choose to take
Hey All,
Has anyone heard of any NABCEP approved seminars being offered
between the Small Wind Conference and the MREA fair in Wisconsin this
month ? Thursday June 18 is an open day that would be good for some
of us to get in a full day seminar. I need some CEU's for my upcoming
NABCEP
Kelly,
I can currently not installing the 690.47D equipment. My inspector is not
asking for it. I personnal feel 690.47D is one of a few unmitigated
disasters contained within NEC 2008. Perhaps I use too strong a term, but as
the AJH's face an increasingly contadictory Code, they will continue to
IRS Guidance on Electing ITC
(Copyright 2009 Stoel Rives LLP)
On Friday, June 5, 2009, the Internal Revenue Service issued Notice 2009-52,
which provides guidance informing taxpayers how to elect to claim the
Investment Tax Credit (ITC) under IRC ยง 48 in lieu of the Production Tax
Credit
Kelly,
I always install a grounding electrode at the array. I always run a continuous
(not spliced), properly sized, or oversize (usually #4), bare, copper conductor
from the array modules and frame, to that electrode, then continue it,
direct buried, to all of the other grounding electrodes
Dick,
Kudos for the contributions to the magazine. I do hope as John W.
speculates that this will all be sorted out in NEC 2011.
In the meantime, while I can see the validity of your method, I don't think
it is well supported by NEC 2008. Specifally at 690.43 (which would overide
the more
For us, the stimulus has been - and is expected to be in the future - a big
joke. We were lucky in that we get quite a few local off-grid installs and
upgrades, because the grid tie market has dropped by over 50% in the past 6
months or so. While panel prices have dropped, it seems like almost
Some California residential PV contractors say permit, fire marshal,
interconnect, and rebate paperwork adds $1/W to the retail CEC-AC price.
- Original Message -
From: Wind-sun.com wind...@wind-sun.com
To: RE-wrenches re-wrenches@lists.re-wrenches.org
Sent: Friday, June 05, 2009 8:15
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