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Door switch/contact location?

Discussion in 'Security Alarms' started by Bob, Feb 4, 2004.

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  1. Bob

    Bob Guest

    I'm installing an alarm system in an older house that was never
    previously wired for it. If I could install a switch/contact on the
    hinge side of one door and on the bottom of the other door, I could
    still go with a hard wired setup. Is this acceptable, and what would
    be the best style of switch/contact for these locations? Thanks in
    advance for anyones comment.
  2. alarman

    alarman Guest

    Bob wrote
    You can install your contact on the hinge side. Use a roller plunger switch
    like a Sentrol 3008. The drawback with this type is the possibility of the
    plunger getting stuck if it's painted, or gets real dirty. Test often.
    Some installers use a standard 3/8 press-fit, and recess the magnet in the
    door. Here you have to be careful to get the magnet positioned just right.
    Too close to the surface and the door has to open to far to trip the sensor.
    Too far back and it won't hold the contact closed.
  3. Bob

    Bob Guest

    How about the bottom side of the door? Has anyone ever installed a
    contact/switch there?
  4. RH.Campbell

    RH.Campbell Guest

    Not me, for two reasons ! Firstly, the contact would be subject to all
    sorts of abuse from "dirt crud and corruption", and damage fro possibly
    being walked on. Second, in many cases you would have to remove the door to
    drill it for the magnet, since there often is limited space for a drill
    between the top of the door and the ceiling.

    I occasionally see pre-wires done this way. After I finish cursing the
    idiots, I end up redoing it properly....

  5. alarman

    alarman Guest

    RH.Campbell wrote
    Yeah, I agree. It's terrible place for a contact. I don't mind removing the
    door so much as the fact that the switch is so visible, and exposed to
    damage. No experienced installer would choose that location.
  6. RH.Campbell

    RH.Campbell Guest

    Fortunately for me, I have never encountered a situation in any kind of home
    that needs a sensor in the floor. I'm sure it has worked for you, but
    thanks, I'll pass on that idea....either a magnetic switch in the frame on
    the lock side of the door or a roller ball at the heel of the door seems to
    cover most any situation....

    And for doors that never seem to fit properly, both switches in parallel....


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