Steve, I once worked in a packing house....that is, a place where cows entered one end, and burgers, sausages and the like exited the other end.
A packinghouse is divided into two types of rooms- refrigerated, and frozen. Everything gets steam-cleaned daily. Can you imagine a better place for condensation to form?
Anyway, if we did not allow for drainage, the lines and boxes would get the most amazing crud in them. Our typical solution was to enter boxes from above, and to have a 'weep hole' in the bottom of the box. Conduit was run in the usual level/ plumb manner.
Still, I can recall several times a pipe was found to be filled with water. When this happened, well, we didn't worry about it over-much.
