GE 45613 GE Z-Wave 3-Way Dimmer Kit with flying leads - Manual (Page 7)

Please Note: Z-Wave home control networks are designed to work
properly alongside 802.11 wireless computer networks, Bluetooth®
and other 2.4GHz or 5.8GHz devices. Some baby cams, wireless video
devices and older cordless phones using the 900MHz frequency range
may cause interference and limit Z-Wave functionality. Many 900MHz
products have a switch to select channel “A” or “B”. You may find that
one of these channels will cause less interference than the other.
IMPORTANT NOTE ABOUT 3-WAY CIRCUITS
The term “3-way circuit” refers to a circuit with two
switches and one load (light) like you find at the top and
bottom of a stairway. There are many ways to physically
wire a 3-way circuit and it is important to understand how
the circuit you wish to upgrade to Z-Wave control is wired.
Below is a description of a typical 3-way circuit.
One of the ways to wire a two-switch/one-load circuit is
to route the incoming power through the first switch, then
to the second switch and then to the load. Although very
common and by no means a standard, it is the easiest
to convert to Z-Wave control. With this type of circuit,
Switch 1 is replaced by the Z-Wave auxiliary switch and
Switch 2 is replaced with the primary Z-Wave dimmer
switch. The auxiliary switch does not actually control
the power; instead, it sends a momentary voltage signal
through the traveler wire to the primary switch which in
turn, controls the power to the load. In the configuration
shown, if the two Z-Wave switches are reversed, Z-Wave
Dimmer Switch will not be able to control the load without
additional wiring.