Rooftop wiring [RE-wrenches]

[bob ollerton]

Stainless will corrode to Aluminum as well.  It just won't corrode to
itself!


----- Original Message -----
From: "Tom Lane" <tom at ecs-solar.com>
To: <RE-wrenches at topica.com>
Sent: Thursday, April 18, 2002 12:28 PM
Subject: Re: Rooftop wiring [RE-wrenches]


> This is not correct. Never put galvanized fixtures, screws or fasteners to
> aluminum rails. The zinc in the galvanized fasteners will corrode to the
> aluminum frame, and weld itself.  The only way to get it off is with a
> torch. Only use 8-18 marine grade stainless steel fasteners with aluminum.
> Gator Tom
>
> ----- Original Message -----
> From: "bob ollerton" <lizard at mcleodusa.net>
> To: <RE-wrenches at topica.com>
> Sent: Thursday, April 11, 2002 3:33 PM
> Subject: Re: Rooftop wiring [RE-wrenches]
>
>
> > 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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> > >
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