One point of clarification regarding SunPower Corp. and WEEBs having just
had communication with them today on this subject.
SunPower has yet to officially approve/sign off on the use of WEEBs with
their metal-framed modules.
They have been exploring the issue but have yet to give their seal of
approval on the WEEB as a grounding means for their modules.
marco
Hi Bill;
690.43 seems to practically spell out acceptance of the WEEB.
and then it cross references article 250.136A.
250.136 EQUIPMENT CONSIDERED GROUNDED ........
"(A)Electrical equipment secured to and in electrical contact with a metal
rack or structure provided for its support...."
(Is it the undefined "in electrical contact"?)
Third, in the NEC 2008 hand book, Exhibit 250.53 shows several generic
(j-boxes, could be any electrical device?) mounted to a metal rack, with one
bonding jumper from the rack to ground.
It seems to make a case that we don't even need the WEEB, that star washers
on bolts to the frame would be acceptable, as long as the frame were
grounded.
On an Outback prewired powerboard (for example), all the equipment is
considered grounded (and passes as a UL assembly) simply by being bolted
altogether on a powder coated steel backing plate.
Is this also a voltage issue, for arrays over 250 v?
I'm sure I'm missing something.
I recall you once saying that UL doesn't even use the grounding hole when
testing modules, that they just clamped an alligator clip to the frame?
Thanks for giving us the "NEC and beyond" viewpoint,
Ray Walters
We need a more generic approach to grounding and that is what is currently
underway.
Amen
Grounding and bonding is extremely important and jurisdictions are
focused on it for obvious safety reasons. We need solutions that are
clearly
reliable and straightforward so that installers and jurisdictional
authorities don't have to constantly be revisiting the issue.
Bill.
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Peter
Parrish
Sent: Monday, September 13, 2010 7:18 AM
To: 'RE-wrenches'
Cc: 'Christopher Flueckiger'; 'Tim Zgonena'
Subject: Re: [RE-wrenches] The Demise of Reason
Bill (and Chris and Tim),
"Be a little bit more careful in your choice of subjects..."?
I am shocked, shocked that you would use that tone with me.
If you would re-read my post, I talked about three things:
(1) SunPower's no longer supporting the WEEB clip technology and
regressing
to the ILSCO GBL-4DBT.
You are right about the insertion of the star washer between the lug and
module frame. I wonder what SP's response to that might be...
(2) As for SP's comment that they pulled the WEEB clip, "due to UL testing
changes". Does anyone close enough to the situation know what this means?
(3) I never mentioned the SP IFF clip. I mentioned the Tyco SolKlip.
SP mentions the IFF in their literature but do not offer it to their
dealers
(as far as I know), and I haven't been able to find it yet in their
product
literature, except for a small low-resolution image. I assumed that the
Tyco
SolKlip was a different component -- however it may be similar or may be
rebranded by SP as the IFF -- I don't know.
Bonding PV arrays and their supporting structures is complicated subject
and
in my experience is one of the more frequently examined aspects of PV
installations by inspectors (along with bonding and grounding the other
components). So it would seem to be an apt subject for discussion by those
of us actively installing PV systems subject to inspection by the AHJ.
- Peter
Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
CA Lic. 854779, NABCEP Cert. 031806-26
peter.parr...@calsolareng.com
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Bill
Brooks
Sent: Sunday, September 12, 2010 8:50 PM
To: 'RE-wrenches'
Cc: 'Christopher Flueckiger'; Tim Zgonena
Subject: Re: [RE-wrenches] The Demise of Reason
Peter,
Be a little more careful in your choice of subjects. You are talking about
the SunPower IFF clip. I have not heard this story, but I don't doubt it.
There have been significant changes at UL and ETL, the two largest listers
of PV modules, in the area of evaluating grounding equipment for PV
modules.
Unfortunately, the shift to overly conservative approaches to module
grounding has caused huge problems with field installations. To make
matters
worse, installation manuals from PV modules have been required to get
extremely specific about the only methods allowed to ground and bond the
module frames. This conservative approach has shut the door on many
methods
that are far superior to the methods shown, because of the cost of
evaluating these products or due to lack of cooperation between UL and
ETL.
Finally, many of the module manufacturer's installation manuals, the ones
we
are supposed to believe, actually violate the listings of the products
they
recommend. The ILSCO GBL-4DBT lay-in lug is the most famous example of
these
mistakes. Several prominent installation manuals state that a stainless
starwasher must be installed under ILSCO lug. Although this will work, it
is
a violation of the listing of the lug. Yet it is in the installation
manual
and it is one of only a very few options--and it is wrong. What are we to
think of this whole situation? It is out of control and messed up.
The problem lies in the poorly worded UL1703 that has not been updated in
this area since the changes in application of the standard started some 3
or
4 years ago. There have been several attempts to get this problem
resolved,
but the attempts have not made it to fruition. There is a new movement
afoot
to deal with this once and for all, but I'm still a little skeptical.
Bill.
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Peter
Parrish
Sent: Sunday, September 12, 2010 1:49 PM
To: 'RE-wrenches'
Subject: [RE-wrenches] The Demise of WEEB
We were informed a while ago that SunPower no longer "supports" their
version of the WEEB clip "due to UL testing changes." (unspecified) and
appears to have regressed to the ILSCO GBL-4DBT lugs with SS star washers,
lock washer, nut and specific torque requirements.
Most people I have spoken with feel that the lug approach, though a
competent means of bonding PV modules, is awkward and time consuming,
compared to the WEEB clips.
What happened wrt UL testing and how is CSA listing affected?
I seem to remember a video showing a conventional lug-based bond fail
under
test as par of a WEEB promo. I hope I can find it and take a look at it
again.
There also is a Tyco SolKlip that SunPower is apparently looking at but no
word yet from SP, and it is not clear that the SolKlip has been affected
by
"UL testing changes".
Any info on the UL testing changes would be much appreciated.
- Peter
Peter T. Parrish, Ph.D., President
California Solar Engineering, Inc.
820 Cynthia Ave., Los Angeles, CA 90065
CA Lic. 854779, NABCEP Cert. 031806-26
peter.parr...@calsolareng.com
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
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