In a wired alarm system, a pair of cores in the cable connecting sensors to the control panel is used for tamper. If the cable is cut by a burglar to prepare for a subsequent break in, the panel will issue an audible or visual warning, even if the system isn't armed. Sensors, bell boxes, junction boxes, auxiliary sounders, keypads and other devices are normally provided with miniature tamper switch contacts that open when the devices have their lids or covers removed. The tamper pair of wires in the 6 core cable is also connected to tamper terminals in each device (these terminals connected to the tamper switches). If a device is opened, the tamper circuit opens and triggers a warning (or sets off the alarm, if it's armed).