[RE-wrenches] Rooftop Conduit

[Jerry Shafer]

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> 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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