I'm installing a NEMA 14-50 in the garage with a dedicated 50amp breaker. I have run the 6/3 romex through the attic and am at the point where I'd exit the attic to the exterior of the house and down to the main panel. I am realizing that I'm not 100% sure how to enter our main breaker panel.
I had planned to use a short run of EMT from inside the attic to exterion, LB conduit body to transition down the exterior wall and then into the top of the panel. My understanding is that code allows me to run romex in the conduit (up to 10ft) and that I must enter the top of the panel. (reference: Can Romex (NM-B) be run through conduit?)
My panel has a ~2x2 square plate on the top. I don't know how to terminate the EMT in a rain tight method. Here's a picture of the top of the panel and general overview of the setup before I've done anything. How can I terminate the EMT in the panel and ensure it's watertight?