Home Run and Beyond

[Anonymous]

Home Run and Beyond
I want to run two 20A circuits from my basement to the attic, and in order to conserve space in a conduit I want to use one each single solid copper 12awg black, white, red, and green. The conduit will be mounted on the outside wall of the home. Once the attic is reached two circuits will emerge to feed fans in the roof as well as bedroom ceilings.
Question: How do I tie the wire into a home run? Do I use two 20A breakers and tie the neutrals together, followed by the greens together, black to black, and red to black?

[Wgoodrich]

Sounds to me like you only need one 20 amp branch circuit to serve the attic fan and the bedroom unless this attic fan is not a vent style attic fan and is instead a whole house fan. Then you would need two 20 amp 120 volt circuits.

Why have you chosen conduit instead of Romex cable in your wiring style are you subject to physical damage or inside walls and closets?

If you are trying to install two hot wires using the same shared bare or green equipment grounding conductor and the same shared white neutral conductor then you may use a black red white and green in the conduit.

Then at the end of run you may use the red as one 120 volt branch circuit and the black as the second 120 volt branch ciruict with both branch circuits using the same white wire and green wire individually serving both 120 volt branch circuits.

One of those two 120 volt branch circuits after the split of the home run would be a black white and green and the second 120 volt branch circuit would use the red and same white and same green for that second 120 volt branch circuit.

Hope this helps

Wg