Re: what is the best wire for a perimeter alarm

["Roland More" <NoSpamroland@xxxxxxxxxxxx>]

Too bad he went to all that trouble of re wiring. He might have saved some
time with simply installing the correct value choke instead.

http://www.mwrf.com/

"Sue" <sodom@xxxxxxxxxx> wrote in message
news:46ee7800$0$15341$4c368faf@xxxxxxxxxxxxxxxxx
> My brother-in-law, who is an electrical engineer, would wake up from a nap
> in his easy chair and walk to the kitchen thru the beam of his PIR only to
> have his alarm start wailing.  "Wait", he said to himself, "I didn't arm
> the system!"  After this happened several times, he began to wonder, what
> in the heck is going on that could arm my alarm?  One evening immediately
> after this happened, he mosied outdoors, and lo and behold he could hear
> his neighbor talking on his ham radio.  Said neighbor had antennas all
> over the outside of his house.  Ron had not used shielded wire for his
> alarm system. He re-wired that weekend, and problem was solved.
>
> "Frank Olson" <Use-the-email-links@xxxxxxxxxxxxxxxxxxxxxx> wrote in
> message news:7vZGi.184845$rX4.154898@xxxxxxxxxxxx
>> Bill wrote:
>>> If you want the *best* wire... In addition to what others said, note
>>> that all that wiring running in the walls/attic of a house acts as a big
>>> "antenna".
>>>
>>> The wiring can get voltage running in it induced by nearby radio
>>> transmitters, etc. and lightning strikes - causing false alarms
>>> sometimes.
>>>
>>> If you use "shielded" wire and ground one end of the shield (at the main
>>> box), this will keep the outside electrical interference out of the
>>> wiring.
>>>
>>> Shielded wire is like TV coax wire which has a metal wrap inside the
>>> jacket. But you can get regular 2, 4, [or whatever] conductor shielded
>>> wire. It is expensive though.
>>>
>>> More about this - Faraday Cage...
>>> http://en.wikipedia.org/wiki/Faraday_Cage
>>
>>
>> Next you'll be telling him to wire up his keypads with CAT 5E... Shielded
>> wire...  sheesh!  We've got alarm systems installed in homes where the
>> customer's are running ham radios.  I've not had a single false alarm
>> that's related to "radio interference".  About the only "interference" I
>> get these days is from young punks driving around with bass speakers the
>> size of garbage can lids playing something they call "tunes" at a volume
>> level that's gotta be close to 140 dB.  You can actually *feel* them
>> coming from a block away.  To top it off, when they stop next to you
>> they'll invariably be talking on their cell phones although God knows how
>> the heck the person on the other end can even hear what they're saying.
>
>