Wiring a Junction Box: 1 source in, 2 sources out

Question

I have an existing junction box and currently 1 source from the basement going in, and one source coming out and that goes to a wall switch.

If I want to connect a second wire to come from that junction box, would I just attach all hot and all neutral wires together in the box? In my head it sounds like this wouldn't be a complete loop, but maybe I am just overthinking it.

So one source going into the box and then two wires coming out of it, each going to their own box in the walls below.

Anyone have a diagram for this? Thank you!

TFK · Accepted Answer

Yes, you would tie the hots together, the neutrals together, and the grounds together. Below is an image of the inside of the box for reference.

And here is a wiring diagram as requested. The main line from your breaker comes in at the top of the diagram and enters the box. It is then tied off and sent to the left to your always hot load or other switch and also to the right towards the existing switch and load. (Black is hot, gray is neutral, orange blobs are wire nuts, and grounds are not shown for simplicity)

I've also included a more clear cut version of the diagram so that you can see the flow of power.

Wiring a Junction Box: 1 source in, 2 sources out

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