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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.
What are the advantages and disadvantages of open circuit fire alarm system?
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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.
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 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.
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.
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.
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.
Compare class E fire alarm system with individually coded fire alarm system.?
Because it is for LIFE SAFETY.
What does nacs mean referencing fire alarm?
Notification Appliance Circuit
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.
