Garage lighting Install a 3way switch in the garage, and inside the house.
Stairway Lighting Install 3way switches at the upstairs and downstairs locations. Pull single-conductor THHN because it lets you pull exactly what you need for the job, Your local electrical supply can give you unusual colors by the foot, so your work is clear - I'd use yellow and orange for the 2 switched hots. Install 3way switches at each end of the hallway.
EMT because it's steel so it provides a ground - that's one less wire to pull. A wiring diagram for two lights and one switch will show the wiring for the lights, switches, power source, and other components that are needed for the circuit. I suggest 3/4" because it's easier to pull than 1/2". Now you can pull anything you want anytime you want. We want to add an additional rose in the loft, at the other end, controlled by the same switch, so that we have the 2 loft lights switching on and off as required. If possible, I really recommend fitting 3/4" conduit, preferably EMT, between your powered fixture and the gang switch. The light in the loft has been placed at one end and is therefore not providing sufficient light for the whole loft. (14 works with "back stabs", 12 often doesn't and requires stopping to put 14 only exists so contractors can work fast and cheap, homeowners can afford paying 20% more for the good stuff, and have time to do it right. It may also exist in 14/4 NM, but you're better off using 12 gauge wire anyway. It's used for just this sort of application. To control fixture #2, you need a third "hot" and 14/3 doesn't provide it.Įdit: You can get 12/4 NM, that will solve your problem (but leave you no further room for expansion.) A quality electrical supply house will sell it by the foot. The hot and neutral terminals on each fixture are spliced with a pigtail to the circuit wires which then continue on to the next light. The source is at SW1 and 2-wire cable runs from there to the fixtures. Leaving grounds and neutrals out of the discussion: you need a black for your always-hot down to the switches, the red for the switched hot back to fixture #1. This diagram illustrates wiring for one switch to control 2 or more lights. I assume you want to control both fixtures separately, since you said "2 gang switches".
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