How did they do it? (No neutral needed dimmer)

["Robert Green" <ROBERT_GREEN1963@xxxxxxxxx>]

http://www.smarthome.com/manuals/2386W2_web.pdf

give details about a:

 2384W2 SWITCHLINC RX PLC 2 Wire Dimmer (White)

which they claim:

    * Installs just like a regular light switch ? no neutral wires are
needed!
    * Ideal for older homes that don't have a neutral wire in the electrical
box
    * Totally adjustable dim level and fade on/off speed
    * Responds to preset dim X10 commands
    * Use with 3-way or greater circuits with the addition of multi-way
companion switches

I thought for an X-10 receiving device to be "listening" it had to have
current trickled through it and that required a neutral connection.  They
say the status LED will not light if there is no neutral connection.   If I
read the diagrams correctly they don't need a neutral, but they do need a
ground.  How likely is it if electricians didn't run neutral to the box that
they DID run a ground wire?

--
Bobby G.