[RE-wrenches] Rooftop Conduit

[Matt Partymiller]

We use OBO Bettermann for rooftops.  They make strut clips to attach to rubber triangles to get height off deck and allow water movement.  You can get the product in galvanized or stainless with aluminum covers.  Listed to ground to itself if properly installed.  Looks good.  Durable to date.

https://www.chalfant-obo.com/Chalfant/Product/Category/10

Not as inexpensive as plastic.

Matt



Matt Partymiller
General Manager
Solar Energy Solutions, LLC
877-312-7456
matt at sesre.com



From: RE-wrenches <re-wrenches-bounces at lists.re-wrenches.org> On Behalf Of Dave Angelini Offgrid Solar
Sent: Thursday, July 30, 2020 11:22 AM
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Subject: Re: [RE-wrenches] Rooftop Conduit


Anyone have something similar that is non combustible, and that one can open and inspect/make changes?



Dave Angelini Offgrid Solar

"we go where powerlines don't"

http://members.sti.net/offgridsolar/

e-mail  offgridsolar at sti.net<mailto:offgridsolar at sti.net>

text 209 813 0060

On Sun, 26 Jul 2020 19:48:59 -0400, Jeremy Coxon <jcoxon at sunwindpowerinc.com<mailto:jcoxon at sunwindpowerinc.com>> wrote:
First time posting so I hope I'm doing this right.

We have been using a product called RayTray on projects in the 20-100kW range for a few years now.  It's basically a white plastic (RPVC) extrusion tray with a cap that builds out quick and does a nice job of protecting wires from sunlight.
Jeremy Coxon NABCEP
Certified MWBE
SunWind Power

Sent from my iPhone


On Jul 25, 2020, at 7:23 PM, Jerry Shafer <jerrysgarage01 at gmail.com<mailto:jerrysgarage01 at gmail.com>> wrote:
Wrenches
Looking at residential installations l do not see cable trays becoming common place in part do to cost and visual appearance.
Commercial is where trays work for home runs, feeders to big commercial combines is common place. But they are not pretty by any stretch. I have used aluminum unistrut as trays on smaller arrays using the crosses and T's then their covers
Jerry


On Fri, Jul 24, 2020, 11:00 PM Corey Shalanski <coresolar at gmail.com<mailto:coresolar at gmail.com>> wrote:
Wrenches,

I noticed a couple good threads ("Cable tray" / "PV Wiring methods") about this topic back in 2013, but I haven't seen much discussion since then. Given some of the advances in PV equipment since then (improved ground-fault protection, arc-fault circuit protection, rapid shutdown), I am curious about current attitudes toward using metallic conduit/cable tray on rooftops. I am primarily interested in hearing about flat commercial rooftops but imagine some of the same conventions may apply for residential rooftops.

What are you using for long (or short) dc circuit runs on rooftops? Is cable tray still considered safer? Are there situations where conduit may be merited? If so, is RMC favored over EMT?

Do best practices change when considering ac circuits (rather than dc)?

Back in 2013 Bill Brooks said that PV installers are the "crazy people" installing conduit on rooftops, and he prophesied that using cable tray on roofs would "become common practice soon." Where do we stand now?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
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