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<p>electronics.</p>

<p><big>Electrical</big></p>
<p>This style of tamper resistance is most commonly found in <a href="page.php?w=burglar_alarm">burglar alarm</a>s.  Most trip devices (e.g. <a href="page.php?w=pressure_pads">pressure pads</a>, <a href="page.php?w=passive_infrared_sensor">passive infrared sensor</a>s (<a href="page.php?w=motion_detector">motion detector</a>s), <a href="page.php?w=Reed_switch">door switches</a>) use two signal wires that, depending on configuration, are <a href="page.php?w=normally_open">normally open</a> or <a href="page.php?w=normally_closed">normally closed</a>.</p><p>
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