Nac circuit styles ) • Selectable strobe synchronization for System Sensor, Wheelock, and Gentex devices. MS-5UD/MS-10UD Shared Features and Specifications • 4 NAC Circuits Style Y (Class B) or 4 NAC. It also pro-vides auxiliary power to support system accessories. It also provides auxiliary power to support system accessories. ) • Selectable strobe synchronization for System Sensor, and Wheelock. † Ten-zone Style B (Class B) or Ten-zone Style D (Class A) with optional module † Four NAC Circuits Style Y (Class B) or Four NAC Circuits Style Z (Class A) with optional modules † Built-in NAC synchronization for System Sensor ®, Wheelock , Gentex , Faraday® and Amseco devices system accessories. 4. alarm current can be divided between the four (4) outputs for powering NAC devices. Supervision and Alarm • Two independently programmable, built-in Style Z (Class A) or Style Y (Class B) NAC circuits • Selectable strobe synchronization for System Sensor, Wheelock, and Gentex devices • Notification Appliance Circuit End of Line resistor matching • Four programmable function keys for ease of maintenance • 10-zone Style B (Class B) or 10-zone Style D (Class A) with 2 optional modules. † Four field-programmable operational modes: – Pass-through. Also available are MIL-R & printed circuit styles with delivery available in bulk packaging as well as tape & reel. – Two Class B & one Class A. Class A Wiring will survive better than Class B Wiring. • Primary and secondary ANN-BUS for connection to following Feb 20, 2024 · The control module lets the FACP selectively turn on the system remote relay outputs or NAC (stands for Notification Appliance Circuits). These also have 2 Power Limited Class A/B (Style Z/Y) NAC circuits with individual trouble indicators. . To keep things simple(?) they called the variations on the different classifications "Style". † Ten-zone Style B (Class B) or Ten-zone Style D (Class A) with optional module † Four NAC Circuits Style Y (Class B) or Four NAC Circuits Style Z (Class A) with optional modules † Built-in NAC synchronization for System Sensor ®, Wheelock , Gentex , Faraday® and Amseco devices During a fire, in Class B wiring style, if a wire breaks, the devices beyond the break won't communicate with the panel. The intent was to add • 10-zone Style B (Class B) or 10-zone Style D (Class A) with 2 optional modules. These circuits may be programmed to activate by groups or various combinations by connecting to one or two existing Class A or B NACs with operating For those who need to cross-reference the performance of previous classes and styles of circuits, NFPA 72 2010 has the initiating device circuit, signaling line circuit and notification appliance circuit performance class/style tables from previous editions of the code included as tables in Annex A. The 10 amp max. • NAC output circuits may be configured as any of the following: - Four Class B (Style Y). , and can be independently pro- accessories. Horn Strobes, Strobes, and Sounders all connect to the panel in the same manner. In regard to both the IDC and the NAC, if they only have two conductors connected to the panel, the circuit can be classified as Class B. 0A auxiliary • Four (4) Style Y (Class B) NAC circuits, which can be con-verted to four (4) Style Z (Class A) circuits with optional ZNAC-92 converter module. 0A auxiliary The NAC/10A supports all ADA requirements and will provide power to ancillary equipment with two Aux outputs (one automatically battery backed-up and one not). 7). It also has 2 power limited Class A/B (Style Z/Y) NAC circuits with individual trouble %PDF-1. , and can be independently pro- volt power to Class B, Style W, Y or Class A, Style Z NAC loop circuits. Feb 23, 2008 · Most of the styles have been removed from the 2007 NFPA 72. 0A auxiliary output for four (4)-wire smoke detectors is available. with Remote Synchronization Output. – Four Class A (requires the HPP31076 Class A adapter). Primary applications include Notification Appliance Circuit (NAC such as strobes and horns) expansion support to meet ADA requirements. Circuit: Physical wire loop carrying power to the Notification Appliances The NAC circuit starts at the main fire alarm panel (or at power expander panels) and goes out to the notification devices in the building. In a fire alarm system, there are (at the moment) seven Classes of communication and power infrastructure (paths): The letters after the word Class are not shown in the order of reliability or importance; the letters after the word Class are only the name of the particular classification. 2 NAC Circuit Wiring 2. system accessories. The remaining classes and styles can be found in in Chapter 6 (tables 6. It is programmed as “switch inhibit”. Addressable Class B Circuits Using two screw terminals on the panel itself, addressable Class B circuits are device supervised. • Integral 80-character LCD display with backlighting and keypad. Additionally, a separate 1 amp auxiliary output for 4-wire smoke detectors is available. – Two Class A (Style Z). It also provides auxiliary power to support system acces-sories. This would be your horn/strobe or speaker circuits off of remote power supplies, addressable fire alarm panels, signal modules, bell cards, etc. 3. A horn or strobe has a current blocking diode. Class B Notification Appliance Circuits (NAC) have 2 wires leaving the panel to power the horns and strobes. The unit comes with either four Notification Appliance Circuits Class B (Style Y) or four Notification Appliance Circuits Class A (Style Z). Each Aux. May 21, 2021 · A guide to fire alarm notification, covering the basics and key components. ” The styles of initiating device circuits (IDC), notification appliance circuits (NAC) and signaling line circuits (SLC) were eliminated, and four new classes were added. Below is a circuits diagram that displays the circuit styles of an Initiating Device Circuit (IDC). • Four field-programmable operational modes: Primary applications include Notification Appliance Circuit (NAC such as strobes and horns) expansion support to meet ADA requirements. In Class A wiring style, the panel can back-feed communication on the return loop, so most if not all devices still communicate. Appliance Circuit (NAC such as strobes and horns) expansion support to meet ADA requirements. Feb 20, 2024 · The Circuit Styles of the NAC in Fire Alarm! In total, there are two types of circuits in the Notification Appliances Circuit system. (Up to 6. Class and style descriptions are assigned to circuits based upon their ability to perform during abnormal circumstances, as depicted in the tables provided for each type of circuit in NFPA 72. Notification Appliance Circuit Simply said, to sound the alarm, the fire alarm panel (in a Conventional System) turns on the fire horns and strobes on a Notification Appliance Circuit (NAC) by turning on the power (in the alarm voltage polarity); to check the wires (Supervise the Wires) when the panel is not in alarm, the fire alarm panel is constantly performing a continuity check of the application circuits (NACs) capable of supplying +24VDC at 3. The wires end somewhere else in the building. 6. 3 NAC Style Y (Class B) 2. • Four field-programmable operational modes: CONNECTING 4-WIRE HORN-STROBES TO NAC CIRCUITS; DUPLICATED DEVICES IN BATTERY CALCULATIONS; FireCAD's method for producing battery and voltage drop calculations explained; Hiding Wirepath from Panel to First Device; The Basics of Connecting Circuits and Pass Through Circuits; Changing Wire Type Used by a Circuit/Creating a New Wire Type The styles of initiating device circuits (IDC), notification appliance circuits (NAC) and signalling line circuits (SLC) were eliminated, and four new classes were added. This wiring Class applies to NAC, IDC and SLC (except the SLC with Short Circuit Isolation) The NFPA 72 2013 recognizes the use of Fiber Optic cable and is not affected by shorts of grounds. The 8A max. 1 & 6. 5A max. 2. • 10-zone Style B (Class B) or 10-zone Style D (Class A) with 2 optional modules. , including a custom one-of-a-kind special Platinum DIN Alternative which follows the slope • 4 NAC Circuits Style Y (Class B) or 4 NAC Circuits Style Z (Class A) with optional modules. CONTROL NAC Y Panel Circuit relay or NAC Supervised NAC Appliance Circuit (NAC such as strobes and horns) expansion support to meet ADA requirements. • 7. • Built-in horn/strobe NAC synchronization with Remote Synchronization Output. - Two Class B and one Class A - Four Class A (requires the HPP31076 Class A adapter). volt power to Class B, Style W, Y or Class A, Style Z NAC loop circuits. • Four Style Y (Class B) NAC circuits, which can be converted to four Style Z (Class A) circuits with optional ZNAC-92 con-verter module. The unit delivers electronically regulated and filtered 24 volt power to Class B, Style W, Y or Class A, Style Z NAC loop circuits. to +6000 PPM/°C. 2 ZNAC-4 Class A Option Module Appliance Circuit (NAC such as strobes and horns) expansion support to meet ADA requirements. 5 %âãÏÓ 27 0 obj > endobj 46 0 obj >/Filter/FlateDecode/ID[22BDBFDD20B5B2110A00D02DA409FC7F>]/Index[27 42]/Info 26 0 R/Length 97/Prev 59435/Root 28 0 R † Ten-zone Style B (Class B) or Ten-zone Style D (Class A) with optional module † Four NAC Circuits Style Y (Class B) or Four NAC Circuits Style Z (Class A) with optional modules † Built-in NAC synchronization for System Sensor ®, Wheelock , Gentex , Faraday® and Amseco devices † Ten-zone Style B (Class B) or Ten-zone Style D (Class A) with optional module † Four NAC Circuits Style Y (Class B) or Four NAC Circuits Style Z (Class A) with optional modules † Built-in NAC synchronization for System Sensor ®, Wheelock , Gentex , Faraday® and Amseco devices • Four built-in, independently programmable Style Z (Class A) or Style Y (Class B) NAC circuits • Selectable strobe synchronization for System Sensor, Wheelock, and Gentex devices • Notification Appliance Circuit End of Line resistor matching • Four programmable function keys for ease of maintenance • Four (4) Style Y (Class B) NAC circuits, which can be con-verted to four (4) Style Z (Class A) circuits with optional ZNAC-92 converter module. Cir • Built-in horn/strobe NAC synchronization. Each circuit has a total capacity of six or nine amperes per panel. circuits (NAC's) capable of supplying +24VDC at 3. 1 Style Y (Class B) The standard configuration for NACs is Style Y (Class B) as shown in Figure 2. tem accessories. Each output is rated at 2. (2 wires total) Class A has an extra life-saving feature. For example: an initiating circuit and a NAC circuit may both be class B, with a panel on one end of the Notification Appliance Circuit (NAC) power supply panels provide combinations of Class A (Style Z) or Class B (Style Y) NACs. This would be your conventional circuits such as a hard wired panel or the wiring off of an addressable monitor module. , and can be independently programmed for Steady, Page 16: Nac Circuit Wiring Installation NAC Circuit Wiring 2. 0A auxiliary Both the IDC circuit and the NAC circuit are supervised this way. In addition to their standard catalog parts, PRC has custom temperature sensitive RTDs with (+) TCRs from +1400 PPM/°C. 0 amp maximum each. 0 amps maximum alarm current. Hope this helps The words Notification Appliance Circuit is a technical term for the output circuit from a conventionally wired fire alarm system. cuits Style Z (Class A) with optional modules. ALARMS PEND N Panel Circuit or NAC Output that will activate upon receipt of an alarm condition, and remain in the alarm state until all alarms have been acknowledged. MS-5UD/MS-10UD Shared Features and Specifications • 4 NAC Circuits Style Y (Class B) or 4 NAC Circuits Style Z (Class A) with optional modules. • Annunciator bus supports up to 8 devices, including ANN-80 LCD Remote Primary applications include Notification Appliance Circuit (NAC such as strobes and horns) expansion support to meet ADA requirements. Feb 8, 2010 · Below is a circuits diagram that displays the circuit styles of a Notification Appliance Circuit (NAC). application circuits (NACs) capable of supplying +24VDC at 3. The tables explain how the circuit should function. Previously, there was information on classes and styles of circuits in the protected premises chapter. ) • Selectable strobe synchronization for System Sensor, Whee-lock, and Gentex devices. † NAC output circuits may be configured as any of the follow-ing: – Four Class B (Style Y). Output is rated for 1 Amp. for the copper-wire signal-carrying loops. Feb 8, 2010 · In the fire alarm industry there are three types of fire alarm wiring circuits. Like the IDC circuit, the NAC circuit is a two wire circuit, and it has an end-of-line resistor. The panel uses continuity to supervise the wires of the Notification Appliance Circuit. The unit delivers electronically regulated and filtered 24 volt power to Class B, Style W, X, Y or Class A, Style Z NAC loop circuits. - Two Class A (Style Z). 7K: ELR Horn Strobe Alarm Polarity Shown Horn Strobe Horn Strobe FCPS-24S Circuit Board Figure 2. 5, 6. The new title for Chapter 12 added the term “pathways. The fundamental function of a Fire Panels NAC circuit is to;1) Notify the building occupants of danger and,2) Monitor the electrical integrity of the circuit so the first function is Apr 1, 2007 · An additional area of uncertainty involves the various classes and styles of fire alarm system circuits defined by NFPA 72. Additionally, a separate 1. to Class B, Style W, Y or Class A, Style Z NAC loop circuits. This article applies those fundamentals to Notification Appliance Circuits (NAC). 0 amps total NAC power when using optional XRM-24B. The 10A max. Additionally, a separate 1A auxiliary output for 4-wire smoke detectors is available. If the wiring was not specifically Class A or Class B, but had other means of supervision and redundancy, instead of Class A and Class B, there was Style 1, Style 2, Style 3, Style A, Style B, Style C, etc. Jan 9, 2024 · Style Y is a designation of circuit performance under different states of the circuit. The NAC system has to use one style of the circuit to make the route for FACP to send messages to the notification appliances. • The large enclosure version, PFC-5004E, has 4 Class B (Style B) initiating circuits which may be con fi gured as 2 Class A (Style D) circuits respectively. Annex C has some example diagrams of the various classes and styles. What is Notification Appliance Circuit (NAC) Supervision? To make sure that the wires that carry power to the horns and strobes are continuous and not broken or loose from a connection, the wires are checked for continuity by the fire alarm panel. A Conventional NAC has a very specific method of wiring. As the FACP gets the signals of smoke or heat in a zone, it immediately sends signals using the control module to NAC so that the activation signals go to Notification Appliances (horn or fire alarm). I've seen drawings with the NAC circuits as class b and the confusion arises when I read CAN/ULC-S524 which mandates that any circuit that develops a fault shall not interfere with other circuits of a fire alarm system, in this case a fault in any zone shall not affect the operation of alarm devices in other zones. lip cqwycwy xbiqs tsrz gqzps eeru lfp fgv sai lie
Nac circuit styles. Class A Wiring will survive better than Class B Wiring.
