Home Automation Possible For Floating House Wire To Pick Up Low Volt. Via Inductive Coupling, Or... ?

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> Hello:
>
> Have a length of 3 conductor (and Gnd. wire) No. 14 AWG running around my
> house.
> Would like to use the red, third conductor, to interconnect some wired-in
> smoke
> alarms.
>
> This red wire is at present, to the best of my knowlege, totally floating.
> Believe that there is nothing hooked to it now.
>
> (but, it is hard to trace totally, and there might possibly be "something"
> connected to it that I am unaware of ?)
>
> Anyway, my question is:
>
> Assuming that it really is totally floating, how likely, or possible,
> would it be
> for this wire to pick up, e.g. 2 V AC, via inductive coupling, RFI, or...
> ?
>
> I ask this because I measure 2 V AC on it (relative to the white neutral),
> which I cannot account for.
>
> Thanks,
> B.
>
>
>