Abstract: A photovoltaic (“PV”) module mounting system including a rail having a base wall and opposed first and second sidewalls extending outwardly therefrom. The first and the second sidewalls each have a flange extending outwardly therefrom. The flanges form a mounting surface adapted to support a PV module. The first and the second sidewalls define therebetween an open channel. A wire support is disposed between the first and second sidewalls and is adapted to support wires extending through the channel at a distance spaced from the base wall. The wire support divides the channel into a wireway and a water channeling portion. The wire support includes an opening therein to permit fluid communication between the wireway and the water channeling portion.