Yes, that's correct. In my answer I was just rephrasing it to say you'd
need twice as many WEEBs as you think. As I understand it, the intent of
this layout is to give the installer two chances to bond each module
properly to the rail.
Unirac has a similar requirement for its UGC-1s on SolarMount, but in
their schematic they don't require you to bond to both rails. So if you
have four modules, you need UGC-1s between A&B, B&C, C&D but you can
have them all on a single rail. I think it's better to alternate between
rails anyway: A&B (top rail), B&C (bottom rail), etc.
DKC
-------- Original Message --------
Subject: Re: [RE-wrenches] Bonding Rails
From: Peter Parrish <peter.parr...@calsolareng.com>
To: 'RE-wrenches' <re-wrenches@lists.re-wrenches.org>
Date: 2009/11/17 15:55
On page 8 it would appear that we need TWO WEEB clips bonding modules A and
B to rails #1 and #2 and another TWO WEEB clips bonding modules C and D to
rails #1 and #2, etc. - Peter
-----Original Message-----
From: re-wrenches-boun...@lists.re-wrenches.org
[mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Dave Click
Sent: Tuesday, November 17, 2009 12:14 PM
To: RE-wrenches
Subject: Re: [RE-wrenches] Bonding Rails
Peter,
(1) it appears that per the WEEB installation manual:
http://www.we-llc.com/Datasheets/104-0404-000008-008.pdf
(page 8) you need to have one WEEB per module rather than one for every
other module as you suggest.
(2) 690.43 Equipment Grounding.
Exposed non-current-carrying metal parts of module frames, equipment,
and conductor enclosures shall be grounded in accordance with 250.134 or
250.136(A) regardless of voltage.
I guess the latter answer depends on whether your AHJ considers the
rails "exposed"-- I would, so in this situation I'd have lugs on each
module and each rail.
DKC
-------- Original Message --------
Subject: [RE-wrenches] Bonding Rails
From: Peter Parrish <peter.parr...@calsolareng.com>
To: 'RE-wrenches' <re-wrenches@lists.re-wrenches.org>
Date: 2009/11/17 14:56
We have been using WEEB clips on all of our installations for over a
year now. We include the WEEB data/installation sheets in our permit
package and patiently point out the clips to inspectors who haven't seen
the WEEB system yet.
Two questions:
(1) For ProSolar rails, can we use one WEEB clip to bond two
adjacent modules (say, modules A and B) on the upper rail (say, rail #1)
and then use a second WEEB clip to bond the next two adjacent modules
(say, modules C and D) on the lower rail (say, rail #2) and then use a
listed lay-in lug (with in our case a WEEB clip) to bond to either rail
#1 or #2 to continue the grounding?
(2) If we DON"T use WEEB clips and use the conventional bonding
methodology per module manufacturer's instructions (proper location on
the module, and listed screws, washers and nuts), do we have to ALSO
bond the rails? We have an inspector in Pasadena, CA that is requiring
this, but this is the first time we have been required to do so. Perhaps
in the past year in ignorant bliss we have missed an important
development? Or have we been dodging bullets for seven years and not
even knowing it?
- 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 <mailto:peter.parr...@calsolareng.com>
Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
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