[RE-wrenches] Cable Tray Marking

[Corey Shalanski]

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.

NEC 690.31(G)(3) requires a label or marking with the wording "WARNING:
PHOTOVOLTAIC POWER SOURCE" at least once every 10 ft.

Does the 690.31 label take precedence? Are there any situations where both
labels would be required (or recommended)?

--
Corey Shalanski
Jah Light Solar
Portland, Jamaica
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