page_title: Smoke detector
section_title: Commercial
hierarchical_section_title: Smoke detector / Commercial
caption_attribution_description: Deutsch: Integrierte Feststellanlage. Feststelleinrichtung, Rauchmelder und Spannungsversorgung sind in einem Gehäuse untergebracht.Autor: Lars Karlsson.
context_page_description: A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household smoke detectors, also known as smoke alarms, generally issue a local audible or visual alarm from the detector itself or several detectors if there are multiple smoke detectors interlinked.
  Smoke detectors are housed in plastic enclosures, typically shaped like a disk about 150 millimetres in diameter and 25 millimetres thick, but shape and size vary. Smoke can be detected either optically or by physical process; detectors may use either, or both, methods. Sensitive alarms can be used to detect, and thus deter, smoking in areas where it is banned. Smoke detectors in large commercial, industrial, and residential buildings are usually powered by a central fire alarm system, which is powered by the building power with a battery backup. Domestic smoke detectors range from individual battery-powered units, to several interlinked mains-powered units with battery backup; with these interlinked units, if any unit detects smoke, all trigger even if household power has gone out.
context_section_description: Commercial smoke detectors are either conventional or addressable, and are connected to security alarm or fire alarm systems controlled by fire alarm control panels (FACP). These are the most common type of detector, and are usually significantly more expensive than single-station battery-operated residential smoke alarms. They are used in most commercial and industrial facilities and other places such as ships and trains, but are also part of some security alarm systems in homes. These detectors don't need to have built in alarms, as alarm systems can be controlled by the connected FACP, which will set off relevant alarms, and can also implement complex functions such as a staged evacuation.
caption: An integrated locking mechanism for commercial building doors. Inside an enclosure are a locking device, smoke detector and power supply.
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