Nfpa 72 2013 Pdf Download

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National Fire Alarm and Signaling Code® NFPA 72 provides the latest safety provisions to meet society's changing fire detection, signaling.

The requirements that formed the basis for the new Chapter 12 were originally found in the chapter on the fundamentals of and in the chapter on protected premises fire alarm system. The new Chapter 12 brings together formerly SIG-FUN, Fundamentals of Fire Alarm and SIG-PRO, Protected Premises Fire Alarm Systems. In summary, this post highlights the following changes: • The old “Class” and “Style” assignments have been changed to reflect a performance-based description of fault tolerance using the term “Class” only, “Style” is now deleted. For example: 12.2.3 states that the designation of the pathways shall be permitted to also include the performance of the pathway (interconnection) to survivability from attack by fire. • Pathway survivability is now defined as Level 0, 1, 2 and 3. Let’s drill down into Clause 12.2.1 regarding performance and survivability applications.

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In the 2007 edition of NFPA 72, initiating device circuit, signaling line circuit, and notification appliance circuit performance class/style tables were rooted in “copper” wiring methods. Today, we understand that with the realization of intelligent buildings, the uses of new cabling communication mediums in addition to the standard copper fire alarm signal cable are prevalent. Chapter 12 applications addresses how fire alarm control units now use new communication technologies, such as Ethernet, fiber optics and wireless mediums. What is really interesting is that the old “Class” and “Style” assignments have been changed to reflect a performance-based description of fault tolerance using “Class” only. For example: • New Class A applies to optical fiber media • New Class C applies to Local Area Networks (LAN) and Wide Area Networks (WAN). We have developed a few tables that will help you make the transition from the old “Class” and “Style” to the new NFPA 72 Chapter 12 Class A,B C,D,E,R, S and X designations.

Let’s start with the old Class “A” Style 6. Class A Circuit Designations. We know that a pathway designated as Class A will include a redundant path. Its operational capability will continue past a single open on the circuit. Also, for Class “A” any conditions that affect the intended operation of the path will be annunciated at the control unit.

What is interesting about this change from Class “A” Style 6 to simply Class A is that NFPA 72 Chapter recognizes that the inherent nature of fiber optic cables. Optical fiber communicates with light and is not adversely affected by ground faults or shorts. In context with many campus type life safety networks, the benefits of fiber, such as lightning storm immunity is beneficial to the performance of the life safety network. Class B Circuit Designations.

Here we see how the advancement of intelligent buildings has had a positive influence on the Standard. The Class X pathway designation defines those performance characteristics of 2007 NFPA 72’s “Style 7 signaling line circuit.” The new Class X designation is provided to ensure additional performance requirements for the formerly named “Style 7” is accounted for. A Class “X” pathway will include a redundant path just like the Class “A” topology. Its performance will continue to operate past a single open or a single short-circuit. Also, any conditions that affect the intended operation of the path will be annunciated. Next week we will explore the second part of Chapter 12 regarding the survivability of circuits. For example: Chapter 12 does not prescribe survivability, it simply describes the survivability level designations.

We must reference Chapter 24 describes the different levels of survivability per the application. Let me know if you have any questions or comments in the area below and please don’t forget to share this post!

Author: Nfpa ISBN: Genre: Medical File Size: 60. 52 MB Format: PDF, ePub, Mobi Download: 232 Read: 1221 Avoid costly delays and violations with quick answers to your Code questions in the new 2013 National Fire Alarm and Signaling Code Handbook. For complete, reliable 2013 Code support, nothing tops the fully updated 2013 NFPA 72r: National Fire Alarm and Signaling Code Handbook. Written by industry leaders, it's packed with application guidance and explanations of code intent to bring you up-to-speed on new requirements fast so you can install and maintain fire alarm and emergency communications systems for optimal effectiveness and reliability. This essential NFPA 72 companion has everything you need to understand, implement, and enforce provisions correctly and confidently.

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