Rooftop wiring [RE-wrenches]

bob ollerton lizard at mcleodusa.net
Thu Apr 11 12:33:33 PDT 2002


If you are looking to protect the aluminum, Zinc (galvanized hardware) is
less reactive with Aluminum than stainless steel in wet environments.




----- Original Message -----
From: "Bill Brooks" <billbrooks7 at earthlink.net>
To: <RE-wrenches at topica.com>
Sent: Thursday, April 11, 2002 11:57 AM
Subject: RE: Rooftop wiring [RE-wrenches]


> Kurt,
>
> The screw needs to be stainless so it will not galvanically corrode with
the
> aluminum. Some manufacturers provide these screws, some do not. The main
> reason the code requires attachment to each module is because the
> manufacturer tests the module at UL with the grounding point shown on the
> module. Because they do not provide any other direction on acceptable
means
> of grounding, or test those alternative means. This is a major hastle for
> rooftop installations because the grounding systems were never designed to
> be easily installed on roofs. They were designed for open rack mounting.
>
> This is an area where installers are going to have to make their voice
known
> to manufacturers so that they provide us better products for grounding.
>
> Bill.
>
>
> -----Original Message-----
> From: sunwise at cheqnet.net [mailto:sunwise at cheqnet.net]
> Sent: Thursday, April 11, 2002 11:10 AM
> To: RE-wrenches at topica.com
> Subject: Re: Rooftop wiring [RE-wrenches]
>
>
> Brad Bassett wrote:
> >
> > Another question I have is how often do other installers use a ground
> > wire to every module, or a star washer on each module and ground the
> > rack? What's common practice for grounding arrays?
>
> Hey Brad,
>
> I think code says you're supposed to hit every module and I do the
> mast/rack as well.  I have heard that part of the reason each module
> needs its own ground connection has to do with the resistance of the
> anodizing on the AL frames (is the star washer suposed to dig in past
> the anodizing?).
>
> I use self drilling/self tapping, hex-head screws that easily drive into
> the panel's designated point of ground on the frame, but have heard that
> such screws do not meet code, any additional comments?
>
> Kurt Nelson
>
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