| 摘要 |
<p>The site has a machine e.g. crane (2), whose height is greater than a palisade and a surrounding building of the site, where the site is delimited by the palisade or enclosure (1). A presence or movement sensor (3) is arranged so as to detect a non-desired intrusion on the site. A lighting unit (5) is placed on a top part of the machine. A transmission-reception device (4) is arranged so as to send a control signal toward a control device of the lighting unit to control the initiation of lighting on the top part of the crane when the sensor detects the intrusion on the site.</p> |
