I have a single car detached garage. There has been electrical run from the house to the garage for years, but not by code. It's literally just 14-2 wire from a junction box attached to the side of the house and run through a hole in the garage down to an outlet to power the garage door opener. This needs to be replaced but I'm not sure what is code or acceptable. There is a concrete patio between the house and garage that makes underground trenching impossible. Is there a way this can be done by code by having the conduit run from the roof of the garage to the junction box at the side of the house? This would be about 10' off the ground. Thank you.