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In the US, NFPA 72 (2007) 4.4.1.4.2.2: "Circuit disconnecting means shall have a red marking, shall be accessible only to authorized personnel, and shall be identified as 'FIRE ALARM CIRCUIT'".
Other codes, or earlier versions, may have slightly different requirements, such as marking it "FACP" for "fire alarm control panel."
What else can I help you with?
What is a Fire alarm circuit style y?
Style Y is a designation of circuit performance under different states of the circuit. For example: an initiating circuit and a NAC circuit may both be class B, with a panel on one end of the circuit and a resistor on the other. If there is an open on either circuit (the panel doesn't see the EOL), then a trouble is initiated at the panel. However, if there is a short between the two wires on a circuit, the panel will react very differently on the initiating circuit than it will on the NAC. Style Y means that the fire alarm panel will display a trouble on either an open or a short on the NAC circuit, where style 4 means that the Initiating circuit will generate an alarm on the panel in the event of a short, and a trouble in the event of an open.
Will manually turning off a shunt trip breaker set off the fire alarm?
Manually turning off a shunt trip breaker should not set off the fire alarm. The only way that the breaker could set off the fire alarm when turned to the off position is if there is an auxiliary contact on the breaker connected to the fire alarm circuit. This is not usually done because the breaker should be able to be turned off when doing maintenance on the breakers circuit. If the breaker is a mandatory feed breaker to a piece of fire alarm equipment and shouldn't be left in the off position it might have a trouble circuit connected to the fire alarm panel. A trouble alarm on a fire alarm panel is different from an alarm circuit alarm.
Does a fire alarm control panel need a dedicated branch circuit?
Under the NFPA Fire Alarm Code, the control panel must have its own dedicated circuit, the circuit must be labeled "Fire Alarm Circuit" and the handle of the circuit breaker must be colored red. Other rules apply in jurisdictions that adopt other standards, or for other types of fire alarms. For example, under New Hampshire Fire Code, you are PROHIBITED from installing self-contained smoke alarms on a dedicated circuit.
What is the minium size branch circuit for a fire alarm system?
Are you referring to the circuit supplying power to the control panel or the initiation/notification branch circuits controlled by the fire alarm system? The ampacity of the fire alarm control panel would determine the circuit size of the branch circuit supplying power to the control panel and the terminal on the control panel and fire alarm device would detrmine the size of conductor that it will accept. Most fire alarm control panels would require a minimum 15 amp circuit. The minimum conductor size allowed per the NEC would be 14 AWG. 22 AWG. is the smallest conductor that most control panels and device terminals will accept. These are considered Power Limited circuits.
What is a fire alarm panel?
Mimic panel in fire alarm system 'mimics' or mirrors the signal of the Main Fire Control Panel.
How a mimic panel works in fire alarm system?
Mimic panel in fire alarm system 'mimics' or mirrors the signal of the Main Fire Control Panel.
Does a fire alarm circuit have to be in a separate conduit?
yes because of it having a signals, if it mix with power cable, fire alarm circuit get distributed.
How do you open a fire alarm?
To open a fire alarm, you typically need to break the glass or press a button on the alarm panel. This will activate the alarm and alert others of a fire emergency.
Why to use pnp transistor in fire alarm circuit?
You can use a PNP or an NPN transistor in a fire alarm circuit. Both will work. It all depends on how you want to energize the alarm, and with what polarity of signal.
Can fire alarm sub panel power supply tap from main fire alarm panel?
Yes, as long as there is enough typical/backup/standby power for both.
Where should a fire alarm control panel be sited?
It should be really located by an entrance exit for conveniant reasons. For example, when there is a fire alarm or a fire, the fire brigade can quickly access and see where abouts the fire has been reported to, instead of wondering around to find it in some random office, corridor some where. Or you could have repeater panels, two panels that nearly look identical to eachother. The main panel controls the system on its own. It then corresponds the information from the main panel to the repeater panel where it is displayed. Idealy, you should have some zone displaying panel by an exit so it can easily be accessed and looked at with the main panel being at a central office somewhere. Both ways are a good option.
What is the main function of resistances in fire alarm circuit?
Heat changes the resistance of a circuit. The change is detected by the system, and activates the alarm.
