Where is Ground Clamps [RE-wrenches]

[Dean T. Newberry]

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Great point Eric,

    The KC120's in my garage have two tiny wood screws run through a 
drilled chamfered hole into the plastic alignment boss on the J-box. It 
is not a great stretch to consider using a different screw that would 
also attach the ground lug.
    Or, the manufacturer could issue a technical service bulletin (like 
the air plane mechanics get) recommending/ requiring using that hole for 
attaching the ground lug with a  #12 x 3/4" self drilling Stainless 
flange screw. I am assuming that the tiny little wood screw is used for 
the fabrication process and once the adhesive for the J-box adhesive is 
cured, the screw is no longer required, or that the screw would be an 
appropriate change-out item for securing the J-Box.
    An alternative would be to change the extrusion die for the frame to 
include a groove ~1/32" wide, at position approved for using a self 
driller for attaching the ground lug, ie provide a line for a drill 
target instead of a couple of holes.
    All of this discussion of course is predicated on the proposition 
that the self drilling screw cuts the resistive anodized coating and 
provides an adequate ground path from the frame to the lug, and that the 
clutch on the driver is set to not strip out the cut in threads.
    All of the installation parameters can be set out in the service 
bulliten, so that the insurance adjusters can determine who's at fault 
when little Johnnie gets a fatal zap from peeing on his neighbors solar 
panels.
    Presumably all certified, licensed, registered, bonded, insured 
solar manufacturers, contractors and their solar installation employees 
will be on the distribution list for this "Solar Technical Service 
Bulletin", and will never be in a position to be liable for damages, 
whereas everybody else.......

cul  Dean T. Newberry



Eric Smiley wrote:

>Is there any reasonPV module junction boxes couldn't be manufactured
>with an equipment bonding screw inside that was connected to the module
>frame?
>
>Eric Smiley
>Project Leader
>Photovoltaic Energy Applied Research, Technology Centre
>British Columbia Institute of Technology
>Burnaby Campus
>
>NE25 - 3700 Willingdon Avenue
>Burnaby, British Columbia
>Canada V5G 3H2
>
>phone: 604.432.8657    fax: 604.436.0286
>esmiley at bcit.ca             www.tc.bcit.ca
>
>The information contained in this E-mail is intended for the addressee
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