Just curious. I normally see in unfinished buildings such as garages, where the romex wiring is stapled to the sides of trusses and other lumber overhead. I am wiring a garage and decided to put the wires on the top of these boards. On the trussses it's on their sides because of the boards that run upward, but most of the wires run down the center of the building on a 2x4 that runs the length of the building and was put there just for the lights (plus a little bit more stability for the trusses). This is a low roof so there will never be a floor put up there. Aside from a few birds that get up there, nothing will be placed on top of these wires. I just thought it would look better if they were on the top. I was wondering if this is legal, before I go any further with them.
Thanks