Re: [RE-wrenches] grounding on metal roofs

Mon, 18 Jun 2018 10:42:36 -0700

NEC 690.47 (A) requires the array to be grounded, not necessarily the roof. If you have bonded the rails and modules and your grounding conductor goes back to the service you should be good. 690.47 (B) allows installation of an auxiliary grounding electrode (ground rod or building steel). Not a bad idea in lightning prone areas. ;) Local AHJ may have different opinions.

Bruce Fiero-RMI


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-------- Original Message --------
Subject: Re: [RE-wrenches] grounding on metal roofs
From: "glenn.b...@glbcc.com" <glenn.b...@glbcc.com>
Date: Sun, June 17, 2018 6:17 pm
To: AE Solar <autonomousenerg...@gmail.com>
Cc: RE-wrenches <re-wrenches@lists.re-wrenches.org>

Depends on the seam profile. Same device may be used in many cases. We have Also drilled and used the standard direct burial lugs on the underside of the pans, at the wave when they hang over enough to get working space. Then a horizontal run of copper wire to connect.

Don't be lulled into thinking that S-5 clamps are listed for grounding roof pans - they are not. They are only listed for module bonding to ground.

Sent from my 'smart' phone so please excuse spelling and typos.

------ Original message------
From: AE Solar
Date: Sun, Jun 17, 2018 8:46 PM
Cc: RE-wrenches;
Subject:Re: [RE-wrenches] grounding on metal roofs

thanks glenn. and what about commercial? anyone have code references regarding grounding when doing solar on metal roofs? i thought a few years back there was a conversation on this but i can't seem to find it.

Adam Katzman
Autonomous Energies
PO Box 1245

On Sun, Jun 17, 2018 at 1:46 PM, glenn.b...@glbcc.com <glenn.b...@glbcc.com> wrote:
We use the Ilsco SGB-4 ground lug on every pan under the array for residential systems.

-Glenn

Sent from my Verizon LG Smartphone

------ Original message------
From: AE Solar
Date: Sun, Jun 17, 2018 12:29 PM
To: RE-wrenches;
Cc:
Subject:[RE-wrenches] grounding on metal roofs

wrenchers,
what methods are you all using for grounding on metal roofs? thanks
adam

Adam Katzman
Autonomous Energies
PO Box 1245

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