This is interesting, because we were considering cable trays, too. My
guess is that both requirements would apply. Picky, but I don't see
that 690 exempts the requirements of 392. One is for PV, one is for over
600 v. Some code iteration in the future might have combined language
for PV over
Wrenches,
I am curious about the marking requirements for cable trays containing PV
source/output circuits rated over 600 volts, installed on a building:
NEC 392.18(H) requires a permanent, legible warning notice carrying the
wording “DANGER — HIGH VOLTAGE — KEEP AWAY” at least once every 10 ft.
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