I need assistance with interpretation of the following article. My contractor is using the following Code exception to omit labeling on PV string wires. Their logic is that each string wire is is pre-fabricated to specific lengths and thus meets the spacing and arrangement exception. Who on the code making panel or who know an independent engineer that can provide their interpretation on this issue?
Wording from 2017 NEC Article 690.31
(B) Identification and Grouping. PV source circuits and PV output circuits shall not be contained in the same raceway, cable tray, cable, outlet box, junction box, or similar fitting as conductors, feeders, branch circuits of other non-PV systems, or inverter output circuits, unless the conductors of the different systems are separated by a partition. PV system circuit conductors shall be identified and grouped as required by 690.31(B)(1) through (2). The means of identification shall be permitted by separate color coding, marking tape, tagging, or other approved means.
(1) Identification. PV system circuit conductors shall be identified at all accessible points of termination, connection, and splices. The means of identification shall be permitted by separate color coding, marking tape, tagging, or other approved means. Only solidly grounded PV system circuit conductors, in accordance with 690.41(A)(5), shall be marked in accordance with 200.6.
Exception: Where the identification of the conductors is evident by spacing or arrangement, further identification shall not be required.