How to wire a door position switch?

Wiring a door position switch—such as a magnetic security contact or mechanical door jamb switch—requires careful connection to a low-voltage security panel, alarm system, or smart home relay. First, ensure power is turned off if working with line voltage, though most door position switches operate on low-voltage 12V or 24V circuits. Mount the stationary switch housing to the door frame and the corresponding magnet or actuator to the moving door edge, ensuring they align within a fraction of an inch when closed. Strip a quarter-inch of insulation from the signal wires, connect them to the switch terminals (normally open or normally closed depending on your system requirements), secure the wiring channels, and test system continuity.

Wiring a door position switch (such as a magnetic contact sensor used for security alarms or automated lighting) requires careful planning and low-voltage or line-voltage safety precautions. First, determine whether you are installing a low-voltage security sensor or a line-voltage door jamb switch; for low-voltage security wiring, run standard two-conductor alarm wire from the control panel to the door frame. Second, mount the stationary switch housing securely into a drilled hole in the wooden door jamb, and mount the corresponding magnet directly onto the moving door edge, ensuring they align perfectly within a quarter-inch gap when closed. Third, strip the wire insulation and connect the leads to the switch terminals, securing them with wire nuts or screw terminals. Always disconnect power if working with active circuits. You can verify success by testing continuity with a multimeter as you open and close the door.