[RE-wrenches] Rooftop Conduit

[Corey Shalanski]

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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