How high does exposed EMT have to be from ground running down side of home?
Hanging EMT conduit exterior to home
conduit
Related Solutions
You want a PVC-to-threads adapter as depicted below (presumably 3/4" to match the size of the knockouts on your box, with a 1" to 3/4" PVC reducer used to adapt the LB's 1" to the adapter's 3/4").
You then use PVC from the LB to the adapter/reducer pair, and a locknut to hold the adapter to the box.
Not if you don't want to. The EMT piping is itself a valid ground path, provided there is a ground path that is continuous back to the panel. All my work is in EMT and I don't own any green wire.
If you need to bond from the EMT to a ground wire, most likely there is a hole tapped for a 10-32 screw on the metal junction box, it may be sitting up on a pucker to give the ground screw some clearance.
UK-style "ring circuits" are illegal in the United States and the wiring of the circuit should not be looped back to the panel.
Sometimes conduit winds up being laid in a ring simply out of coincidence but the wires inside do not go in a loop.
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Best Answer
I would not use EMT at all. It is not weatherproof. Those compression couplers (you know, the not-setscrew ones) are not for weatherproofing, they are for better grounds. I would either go with thickwall with threaded connectors which I would teflon or dope for watertightness, or preferably PVC, which is cheap and easy to work with.