I've got a feed from my electrical panel in the garage to a single outlet inside the house (for the entertainment center). This was installed by an electrician back in 2009. Through the garage, the wires run through conduit until it reaches a wall where it punches through and continues via romex under the house in the crawlspace. I've moved the entertainment center and want to branch that feed to serve both the existing outlet (now unused) and a new one near where the entertainment center now sits.
I'm wondering if I'm able to simply wire nut a 2nd length of romex onto the existing junction where the conduit meets up with the romex. This would result in a Y at that point, with one part of the Y going to the existing outlet, and the other part going to the new outlet.
I'm not sure if this is acceptable practice or if it would meet code. Most examples of wiring I've seen have the outlets run in a single string rather than branched. If it's not valid, is my only good option running a new line from the existing outlet to where the new one wants to be?