Stick two in one and put the other two in seperately.
It is highly recommended that these ground connections be completed first, then gently folded into the rear of the box - out of the way - leaving only the shorter ground leads out for easy connection to devices. No ground connection is made to plastic, fiber or other non-conductive box. 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. Shut power off.
This is a very important step.
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