So I know this guy...

Holbs

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who, foolishly, ran shielded 22/2 wire through his house! He was unaware that he was suppose to use unshielded 22/2. He may have to re-pull with the correct wire as there is still time for it. Curious. What does happen if you use shielded wire for door/window contacts? The box I ... I mean he ... used does say alarm signal cable and it's not red (I believe fire alarm cable has to be shielded).
 

Old Timer

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I installed an alarm in a house that used telephone cable to all of the windows and motion sensors. It has worked well for over 10 years.
Also used a cat 5 cable for the keypad. He was retired from telephone company.

Shielded cable will not hurt, but doubt it is needed.
 

TonyR

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I'd likely use it, being careful to ground only one end of the shield (not both) to earth ground. I'll wager it'll work just fine.
 

sebastiantombs

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Depending on the RF environment, say a local radio station nearby, not grounding one end will create a bunch of nice antennas that will have some interesting voltage levels on them. I don't think it would be a problem for an alarm system, simple DC circuit, but one never knows.
 
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