Re: [RE-wrenches] Rooftop Conduit
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
m...@sesre.com
From: RE-wrenches On Behalf Of Dave
Angelini Offgrid Solar
Sent: Thursday, July 30, 2020 11:22 AM
To: RE-wrenches
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 offgridso...@sti.net<mailto:offgridso...@sti.net>
text 209 813 0060
On Sun, 26 Jul 2020 19:48:59 -0400, Jeremy Coxon
mailto:jco...@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
mailto:jerrysgarag...@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
mailto:coreso...@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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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/ [1]
e-mail
offgridso...@sti.net [2]
text 209 813 0060
On Sun, 26 Jul 2020 19:48:59
-0400, Jeremy Coxon 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 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 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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[RE-wrenches] Rooftop Conduit
I design a lot of grid tied projects, but I still do a rooftop about once
or twice a year. All of them going back 7 years or so always used
covered/vented cable tray. This includes homeruns, DC feeders, and all AC
wiring. There still is some metallic conduit used (usually EMT) - a small
jumper for a single wire, or the 3'-5' jump from the cable tray to the
inverter or panelboard, or a single circuit output. Cable tray is a lot
more cost effective and it has thermal expansion inherently built in so
there's less concern about separation. You can also fill up a smaller area
than conduit so it's a bit easier to walk around, although we have to
install some stairs to go over some of the more crowded spots.
It gets a little complicated and labeling is incredibly important as you
don't want to mix DC and AC wires in the same tray, nor can you mix
communication cables in it either.
I haven't done once under the Jan 1 2019 rapid shutdown clause yet nor do I
see one on the horizon anytime soon but I see no reason why cable tray
still won't be used.
> Date: Sat, 25 Jul 2020 01:00:03 -0500
> From: Corey Shalanski
> To: re-wrenches@lists.re-wrenches.org
> Subject: [RE-wrenches] Rooftop Conduit
> Message-ID:
> nhj27yoxvtu0o7gjecpbpffcommq+mrxjlzeqvap2t...@mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> 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
> -- next part --
> An HTML attachment was scrubbed...
> URL: <
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20200725/6cc8ada8/attachment-0001.html
> >
>
>
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Re: [RE-wrenches] Rooftop Conduit
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 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 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
>> ___
>> List sponsored by Redwood Alliance
>>
>> List Address: RE-wrenches@lists.re-wrenches.org
>>
>> Change listserver email address & settings:
>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
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>> www.members.re-wrenches.org
>>
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Re: [RE-wrenches] Rooftop Conduit
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 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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[RE-wrenches] Rooftop Conduit
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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