Rooftop wiring [RE-wrenches]

[Bill Brooks]

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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