[RE-wrenches] Bonding Rails

[Peter Parrish]

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-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at 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.parrish at calsolareng.com>
To: 'RE-wrenches' <re-wrenches at 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.parrish at calsolareng.com <mailto:peter.parrish at calsolareng.com> 
> Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885     
>

> 
>  
> 
>  
> 
> 
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