How to wire a light switch in the USA

3 way light switch with power feed via the switch (two lights)

Here we have multiple lights controlled by 3 way switches.

The hot from the power source (cable C1) connects to the common terminal of the first 3-way switch (SW1) and the neutral is spiced, in the switch box SB1, through to the second 3-way switch (SW2) via the 3 wire cable (cable C2, that also carries the travelers that connect the two switches) where it is spliced through to the first fixture (F1) and connects with the neutral of each light. In the same way, the hot from the common terminal of the 3-way switch SW2 connects to the hot terminal on each light via cable C3 (spliced in fixture F1).
Circuit diagram for 3 way switches controlling two lights with the power feed via the light switch

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