I want to add a new outlet to a old circuit I have old wiring and would like to add new wires the only wire they had at the store was 8-3. What will this do if anything my house was built in 1962. I do have a breaker box not fuses. And it is a very short run is it better to take the old wire to the new receptacle and then jump to the old receptacle or does it matter? How can I tell what my old wire is and whether I have a neutral
Thank you everyone. After many responses I drove over to a bigger town and got 10-2 and used a junction box. To answer questions I was wiring in a 15 amp receptacle with 2 USB charging ports in the old receptacle spot and running a new receptacle behind my TV to hide all the wires. I did notice that my Circuit breaker what's a 20 amp breaker with 15 amp receptacles. I plan to change that in the future. We will be burying 400 amp to the home soon and adding a 22kw Generac so I want to have his many circuits on the back up as possible.