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2. Ceiling fan - Wikipedia

   en.wikipedia.org/wiki/Ceiling_fan

   It is a common mistake for homeowners to replace a light fixture with a ceiling fan without upgrading to a proper junction box. [citation needed] Ultimately, the weight of the fan must be carried by a strong structural element of the ceiling, such as a ceiling joist. Should an improperly mounted fan fall, especially a 22.7 kg cast iron fan, the ...

3. Twilight switch - Wikipedia

   en.wikipedia.org/wiki/Twilight_switch

   Also, keep in mind that ignition is based solely on the amount of natural light present and not on the height of the sun, so "unwanted ignition" may occur, for example in the presence of compact clouds associated with a significant drop in ambient light on the sensor (e.g., when there is a storm). To avoid this, twilight switches can be ...

4. Light switch - Wikipedia

   en.wikipedia.org/wiki/Light_switch

   The toggle light switch was invented in 1916 by William J. Newton. [2] As a component of an electrical wiring or home wiring system, the installation of light switches is regulated by some authority concerned with safety and standards. In different countries the standard dimensions of the wall mounting hardware (boxes, plates, etc.) may differ.

5. AOL.com - News, Sports, Weather, Entertainment, Local & Lifestyle

   www.aol.com

   AOL latest headlines, entertainment, sports, articles for business, health and world news.

6. Passive infrared sensor - Wikipedia

   en.wikipedia.org/wiki/Passive_infrared_sensor

   A PIR motion detector used to control an outdoor, automatic light. A camera trap with PIR motion detector. An indoor light switch equipped with PIR-based occupancy sensor [1] A PIR-based motion detector is used to sense movement of people, animals, or other objects. They are commonly used in burglar alarms and automatically activated lighting ...

7. Motion detector - Wikipedia

   en.wikipedia.org/wiki/Motion_detector

   A motion detector attached to an outdoor, automatic light. A motion detector is an electrical device that utilizes a sensor to detect nearby motion (motion detection).Such a device is often integrated as a component of a system that automatically performs a task or alerts a user of motion in an area.