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What is the minium size branch circuit for a fire alarm system?
Wiki User
∙ 15y ago
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.
Wiki User
∙ 15y ago
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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.
How can you branch an alarm to a phone?
If the alarm system has an auto-dialler - just program it to dial the mobile in the event of an activation.
What are the advantages and disadvantages of open circuit fire alarm system?
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Is a metal window frame a circuit conductor?
Not normally, but it could be, say in an alarm system.
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.
A bimetallic strip can be used as a thermostst in a simple fire alarm system Explain in detail how a fire would cause the alarm to sound And describe how it could be activated at a lower temperature.?
a fire would bend the strip which would complete the circuit for an alarm. When cooled, it might complete another circuit, answering your second question.
What is thyristors?
A thyristor is a part of a alarm circuit you use it so the alarm stays on
How do you built a mains fail alarm?
Use an intermediary relay that is specifically and only connected to a circuit from a two pole breaker in the distribution panel. Through the N.C. contact of the relay connect your DC alarm system. As long as the power is on the relay stays energized and the N.C. contacts stay open. If a power failure occurs the relay will drop out and close the N.C. contacts. This will close the circuit on the alarm system.
What is the use of capacitors in fire alarm circuit?
Fire alarm system may be having some electronic devices and cards, in which some capacitors are used. Capacitors are part of any electronic cards.
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.
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.
Alarm circuit for the train in same track?
no
