I agree that it just ain't worth it to do work twice. The bottom line is
that if you insist on using the Enphase WEEB solution, ask your
inspector it if it will pass before you do it. Once you develop a
rapport, most are willing to discuss these issues in advance of the
inspection. It doesn't hurt
William,
Reportedly this is the same issue that Staber (the top loading, horizontal axis
clothes washer manufacturer) has made their quest to solve. Reportedly
configuring their washer with different caps. for different inverter models.
You might want to touch base with them for suggestions.
William,
I do not recall. Presently I'm away from my office. I could check tomorrow on
that.
Dave
Sent via BlackBerry by ATT
-Original Message-
From: William Miller will...@millersolar.com
Sender: re-wrenches-boun...@lists.re-wrenches.orgDate: Thu, 03 Mar 2011
22:25:29
To:
Hi Bill -
I see that you recommend that the GEC between the micro inverters be run
in 6AWG before it enters the conduit and transitions to 8AWG. I assume
this is to meet the intent of 250.64(B) - Securing and Protection Against
Physical Damage?
Switching over to equipment grounding, it is very
The interesting thing to me is the underlying assumption in the Code that a
GEC is requried for grid-tied inverters at all. Why isn't EG sufficient for
function and safety.
Which of the following common electrical equipment has the same requirement:
UPS
Motors with regenerative energy
Hello Wrenches,
Does anyone have experience with Mage NABCEP course prep?
Thanks in advance,
Dean
--
Dean T. Newberry
Talbott Solar Radiant Homes Inc.
397 B Street
Davis, CA 95616
T: 530 753-1900
F: 530 758-2050
E: de...@talbottsolar.com
W: http://www.TalbottSolar.com/
Dean,
No experience with Mage but the two prep courses I took were a waist of time
and money (IMHO). Find yourself a one day John Wiles seminar for $100, that
is well worth it. Study, study, study. I would set aside 3-4 hours a day
until test time. Become quick and sure at referencing the NEC,
System grounding requirements.
-Original Message-
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Mark Frye
Sent: Friday, March 04, 2011 7:51 AM
To: 'RE-wrenches'
Subject: Re: [RE-wrenches] grounding the Enphase inverter
The
Bill:
Other than complying just because this is a rule that has to be followed,
is there any logical foundation to the requirement to provide a #8 ground
to a circuit with OC protection at 20 amps?
If there is a valid safety reason, then let's all get behind it and become
adept at
To bring the discussion back around to Enphase, at least in the case of
the D380, there is a green wire in the AC Interconnect. This is
irreversibly crimped to a GEC in the rooftop J-Box. The same question
applies: why a GEC to each microinverter case, and/or why require an
inverter-rail WEEB at
Yes, but that comes from the assumption that the inverter constitutes a
seperately derived system.
But if the only purpose or use of the DC power derived from the DC system is
to drive the AC side of the inverter, how closely does it realy resemble a
classic seperately derived system. As opposed
Hello, we mounted some PV onesy modules as high as we could reach without a
man-lift, but an enterprising thief could reach just as high. The side of
pole mounts hold the bolt heads captive so I bought some aluminum
breakaway nuts. However the nuts have a big diameter which would not fit
inside
Mick
Solar World welds their frame corners, but use a laser with high precision
and very low heat. I have seen racks in Haiti welded instead of bolted to
keep people from walking off with the entire rack. I would not recommend
welding a module frame, Too risky and would probably void warranty.
Excellent post Mark. We spend way too much time as an industry worrying about
these mundane grounding (and over grounding) issues, when there are very little
actual safety issues involved.
Meanwhile, we're missing the real safety problems. (recent commercial system
fires??)
I can't wait for our
From the bit of aluminum welding I've done (MIG not the preferred TIG) I'd say
it would be pretty hard to do without damaging the laminate.
I actually successfully welded attachments to salvage modules back in the 90s.
Also the alloys are probably different between the module and rail, so even if
I would like to remember us all back to 16-20 years ago when
we were required to use a ground cable equal to the
largest conductor in the system. This was typically sized by
the inverter cable at 4/0 copper. I gotta say that was a
really dumb rule.
At that time we were to not create ground
Mick,
I partially belt sanded off one side of the security nut
flange on the cone part just enough to make it fit on one
install. They are still there. Be sure to use gloves that
belt sander is rough on the fingers.
I resorted to holding with a Vice grip wrench. Even then
they flew quite a
Mick,
Direct Power did this some years ago on a piece of Interstate roadside art.
I think it worked quite well to discourage theft. You might want to call
DPW for info; I'd talk with Jeff.
Allan at Positive Energy
On Mar 4, 2011 12:22 PM, Mick Abraham m...@abrahamsolar.com wrote:
Hello, we
The BP oil company installed a ton of solar arrays for cathodic protection in
the desert near Bakerfield in the 80s and 90s. They used Arco and Kyocera
modules at ~50 watts each. They had a terrible time with theft, so they began
welding the modules to the racks and the racks to the steel
Hi Mark, Ray, and wrenches:
I agree that the grounding requirements can be onerous, but I have to
interject that most generator manufacturers do specify a dedicated grounding
electrode conductor. Also, I do not feel that a #8 ground is too big.
Probably
unnecessary 99% of the time, but
The better question is why is there a solid ground in the inverter.
As I stated before-we are talking about system grounding-with 100+ years of
electrical history and precedent to back it up.
System grounding rules are not open to a lot of discussion. That is why my
recommendation since
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