See sources and related links below. For two lights just parallel the feeds from the first light with a two wire cable to the second light.
8Connect feed wires in the first switch box. Connect all ground wires as previously described. The 2 wire cable feed from the power source enters the bottom of the switch box and the hot (black) wire connects to the common or shunt terminal on the 3-way switch.
There is only one such terminal on a 3-way switch. This terminal is usually identified as the one having a different color terminal screw (often significantly darker) from the other two terminal screws (not counting the green ground screw). In the picture of the circuit above, the shunt or common terminal is on the lower right side both of the switches.
Connect the 3 wire cable's white insulated wire (neutral) directly to the 2 wire 'feed' white insulated (neutral) wire with wire nuts (there is no connection of any white wires to this switch). 9Connect 3 wire cable in the first switch box. The 3 wire cable enters through the top of the first switch box.
The red insulated wire connects to either one of the 2 unused terminal screws (shown in the image above to be on the top left and right sides of both 3-way switches). It does not matter to which terminal screw this wire is connected. Connect the black insulated wire to the remaining unused terminal screw on the switch.
10Connect wires in the light fixture's box. Connect all ground wires as previously described, if not already completed. In the light fixture's box, there will be two 3 wire cables.
One 3 wire cable originates at the first switch box and has its white insulated wire as a neutral; the other 3 wire cable originates at the second switch box and its white will become what is called the "switch leg". Identify the switch leg. Mark both ends of the white wire in the 3 wire cable that was installed between the second switch and the light fixture box by wrapping it with black electrical tape.
This alerts others working on the circuit later that the white wire is no longer neutral. This is a newer electrical code requirement, but has been a common practice whenever a white or gray wire is / or can become hot. Since this happens most often at switches, it got the name "switch leg".
Connect the two red insulated wires together with a wire nut. Connect the black wire coming from the first 3-way switch and the white "switch leg" wire coming from the second 3-way switch (has black tape wrapped around it) together with a wire nut. 11Connect 3 wire cable in the second switch box to the switch.
Connect all ground wires as previously described, if not already completed. Connect the black insulated wire to the shunt or common terminal screw of the switch (once again, the common screw terminal is the different colored screw from the rest of those on the switch). Connect the red insulated wire to one of the two unused terminal screws (it does not matter which).
Connect the "switch leg" (white wire with black tape) to the remaining unused terminal screw on the switch. 12Connect the fixture. The light fixture's box should have only a black wire, a white wire and a ground wire to supply power to the fixture.
Check all wire nuts for tightness and exposed neutral and hot conductor surfaces. Fold all wires carefully into the boxes and secure devices and fixture with screws. Install plates and covers.
Restore power and test.
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