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).