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- Class N was introduced in the 2016 edition of NFPA 72 to define performance requirements for Ethernet (network) based fire alarm equipment. Wiring for Ethernet devices is typically home run rather than looped (like traditional fire alarm equipment), making the supervision requirements more challenging.
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The NFPA has divided the signal paths in a fire alarm system into 7 classifications: Class A, Class B, Class C, Class D, Class E, Class N, Class X. These classifications don't show how to wire anything, these classifications show what happens when things go wrong.
Class N was introduced in the 2016 edition of NFPA 72 to define performance requirements for Ethernet (network) based fire alarm equipment. Wiring for Ethernet devices is typically home run rather than looped (like traditional fire alarm equipment), making the supervision requirements more challenging.
In the 2016 NFPA 72, National Fire Alarm and Signaling Code, a new class of pathways was added—Class N (for network). When a contractor wants to connect new equipment to a fire alarm system, the equipment must be allowed by NFPA 72 and, in most cases, be listed for fire alarm usage.
In the 2016 edition, Class N was added to provide information on “network” circuits and pathways, similar to data communications circuits used for connecting computers in buildings. Keep in mind that NFPA 72 does not require any particular class to be used for installation.
These classifications don't really show how to wire anything, these classes show how the building wide fire alarm system is going to work when something goes wrong with the alarm's communication routes. The pathways are now classified as Class A, Class B, Class C, Class D, Class E, Class N, and Class X...
Historically, fire alarm technicians have used two-conductor cable to network the electrical components of most fire alarm systems. That cable connects all of the devices to a control panel as signaling line circuits (SLC), initiating device circuits (IDC), and notification appliance circuits (NAC).
People also ask
What is class N fire alarm wiring?
What is a Class C fire alarm system?
How many classifications are there in a fire alarm system?
What is a NFPA class of wiring?
What is NFPA 72 Class N?
Can a fire alarm system be classified as a Class X?
Class C is for wired Ethernet devices where the pathway is not as important as the communication between both ends of the pathway. (NFPA 72 2016 introduces Class N which is a 4 wire [Class A like] wiring method) Class D is for FailSafe operating circuits.
