What are the basic requirements for the installation and design of smoke alarm system?

One is the ion smoke alarm, which has an ionization chamber and is in the state of electric field balance under normal circumstances. When smoke enters the ionization chamber, this balance will be destroyed and an alarm will be generated. When the imbalance reaches the preset level N=9.5%/m, the alarm will sound. The other is called photoelectric smoke alarm, which has an optical maze with a pair of infrared counting tubes. Under normal circumstances, the infrared receiver tube cannot receive the infrared light emitted by the infrared emitter tube. When smoke enters the optical maze, the receiving tube can receive infrared light by refraction and reflection, thus sending out an alarm signal. Each smoke alarm has reached the test standard of the insurance company's laboratory, but each has its own advantages. Ion smoke detectors can sense tiny smoke particles faster, while photoelectric smoke detectors can sense slightly larger smoke particles faster. When there is a raging fire, there are more fine smoke particles in the air, and when there is smoldering, there will be more slightly larger smoke particles in the air. Chen Xun technical researchers found that if a large number of tiny particles of smoke are generated after a fire, the ion smoke alarm will give an alarm before the photoelectric smoke alarm. The time interval between the two smoke alarms is not long, but this kind of fire spreads very fast, so it is best to install an ion smoke alarm in this place. Another smoldering fire produces a large number of slightly larger smoke particles, and the photoelectric smoke alarm will give an alarm before the ion smoke alarm. It is suggested to install photoelectric smoke alarms in these places. If you want to have both, you can install two smoke alarms where necessary. Basic requirements for installation and design of smoke alarm system: (1) During installation and design, the appropriate detector type and model should be selected according to the protection requirements of the protected area. (2) Determine the installation position, angle and height of the detector according to the effective protection area and site environment, and require the detector to be installed in a hidden position as far as possible under the condition of meeting the protection requirements. (3) The wiring shall be concealed as far as possible to avoid being damaged. If you walk in the open line, use steel wire rope or plastic pipe to protect it from rodents (such as rats). (4) The construction drawing shall indicate the models and specifications of detectors and optical cables in each section, and indicate the purpose of various wires in the cable.