What is the difference between conventional and addressable fire alarms?
Addressable alarm systems connect devices using a loop. This is where one wire connects all devices to the control panel. With a conventional alarm, each device will be connected to the control panel via its own wire, rather than a shared one.
What is addressable fire detection system?
An addressable fire alarm system is one in which all fire and smoke detection devices in a system are connected and communicate both with each other and a central control monitoring location. This interconnectivity allows the control personnel to identify the location or “address” where the initial detection occurred.
What is conventional detection system?
A conventional system employs one or more initiating circuits, connected to sensors (initiating devices) wired in parallel. These sensors are devised to decrease the circuits resistance when the environmental influence on any sensor exceeds a predetermined threshold.
How does a conventional smoke detector work?
How they work: Ionization-type smoke alarms have a small amount of radioactive material between two electrically charged plates, which ionizes the air and causes current to flow between the plates. When smoke enters the chamber, it disrupts the flow of ions, thus reducing the flow of current and activating the alarm.
How many detectors are in a zone?
20 detectors
How many smoke detectors should be on a circuit?
According information provided by the National Fire Protection Agency (NFPA), the maximum number of detectors allowed on one residential circuit breaker is 18. However, out of those 18 detectors only 12 can be smoke alarms.
What type of circuit should a residential smoke alarm be on?
May 26, 2017 – Required by the National Building Code (NBC), smoke alarms must be permanently connected to a lighting circuit, or one that supplies both lighting and receptacles, so as to quickly detect when there’s a problem with the circuit.
What is the difference between 2 wire and 4 wire smoke detectors?
Differences. The key differences between two and four-wire systems are the numbers of wires and how the wiring is connected to the control panel to trigger the alarm. A four-wire system has separate wires, while a two-wire system uses the same wires to power the unit and to trigger the alarm.
Can smoke alarms be on lighting circuit?
1.18 A smoke alarm, or smoke alarm system, that includes a standby power supply or supplies, [ie AC with battery back up], can operate during mains failure. It can therefore be connected to a regularly-used local lighting circuit. ……………