That's one way to use it. You can also wire it hot to hot at the panel.
I did that years ago to block a neighbor's baby monitor.
From:Brian
brian@tech-home.com
> Diagram
>
> http://www.smarthomeusa.com/ShopByManufacturer/X-10-Pro/Item/XPNR/
>
> --
> Brian Dye
> -------------------------------------
> brian@tech-home.com
> http://tech-home.com
>
> "Andrew Burgess" <aab@athlon.cichlid.com> wrote in message
> news:ct8nls$e51$1@cichlid.com...
>> "Brian" <brian@tech-home.com> writes:
>>
>>> http://tech-home.com/store/index.php3?cat=361342&item=1176146
>>
>> The web page says this is installed across the powerline, hot to
>> neutral. How does it work without shorting out the desired X10
>> signal too? Or does it short out everything but the X10 freq and hope
>> the noise
>> source wasn't exactly on frequency?
>>
>>> --
>>> Brian Dye
>>> -------------------------------------
>>> brian@tech-home.com
>>> http://tech-home.com
>>
>>
>>> "Bill Stock" <Me7@Privacy.net> wrote in message
>>> news:KKadnVt5j5b1NmvcRVn-ig@rogers.com...
>>>> Does anyone make a noise filter that's small enough to fit in a
>>>> light box
>>>> (octagon)?
>>>>
>>>> I replaced a couple of CF screw ins a month ago and they have
>>>> started to block the signal. They did not do this when new!