In regards to NEC690.31(B), I'm no longer permitted to share a wireway among AC and DC wires in a wireway, as I used to be able to do. Unless I separate them by a partition.
For most groups of string inverters, it is geometrically inconvenient to construct a raceway for each, given that the AC and DC knockouts are both on the bottom surface. I'd end up with a spaghetti bowl of conduit, instead of a spaghetti bowl of wire in a common raceway.
How rigid is this rule? Is it so rigid, that not one single inch of AC and DC wires are permitted to be in proximity without a partition? Or will it be acceptable as long as I follow it for the majority of wire length?
What counts as a partition for the separating? Must it be metallic? I'd like to use PVC wire duct, with those slotted fingers, and adhere it to the wireway interior.
Obviously, at each inverter along the length, wires have to enter and exit. This would make a couple inches of nearby AC and DC wiring which could violate the rule. In order to get around this, I'd probably use split loom tubing.