Class A NAC Wiring Table

Table 7-1 lists the maximum distances from the NAC terminal block to the last appliance in a Class A configuration, depending on wire gauge and current. Use Table 7-1 to calculate wire distances for your application if you are using Class A wiring.

Table 7-1. Class A Wiring Distances

Alarm

Max Distance

Max Distance

Max Distance

Max Distance

DC

Current @

w/ 18 AWG

w/ 16 AWG

w/ 14 AWG

w/ 12 AWG

Resistance

24 V

(0.8231 mm2)

(1.309 mm2)

(2.081 mm2)

(3.309 mm2)

0.25 A

420 ft. (128 m)

667 ft. (203

1,063 ft. (324

1,691 ft. (515

6 Ohms

 

 

m)

m)

m)

 

0.50 A

210 ft. (64 m)

334 ft. (102

532 ft.

(162 m)

845 ft. (258 m)

3 Ohms

 

 

m)

 

 

 

 

 

 

 

 

 

 

 

0.75 A

140 ft. (43 m)

222 ft. (68 m)

354 ft.

(108 m)

564 ft. (172 m)

2 Ohms

 

 

 

 

 

 

1 A

105 ft. (32 m)

167 ft. (51 m)

266 ft. (81 m)

423 ft. (129 m)

1.5 Ohms

 

 

 

 

 

 

1.25 A

84 ft. (26 m)

133 ft. (41 m)

213 ft. (65 m)

338 ft. (103 m)

1.2 Ohms

 

 

 

 

 

 

1.50 A

70 ft. (21 m)

111 ft. (34 m)

177 ft. (54 m)

282 ft. (86 m)

1 Ohm

 

 

 

 

 

 

1.75 A

60 ft. (18 m)

95 ft. (29 m)

152 ft. (46 m)

242 ft. (74 m)

0.86 Ohm

 

 

 

 

 

 

2 A

53 ft. (16 m)

83 ft. (25 m)

133 ft. (41 m)

211 ft. (64 m)

0.75 Ohm

 

 

 

 

 

 

2.25 A

47 ft. (14 m)

74 ft. (23 m)

118 ft. (36 m)

188 ft. (57 m)

0.67 Ohm

 

 

 

 

 

 

2.50 A

42 ft. (13 m)

67 ft. (20 m)

106 ft. (32 m)

169 ft. (51 m)

0.60 Ohm

 

 

 

 

 

 

 

2.75 A

38 ft. (12 m)

61 ft. (19 m)

97 ft.

(30 m)

154 ft. (47 m)

0.55 Ohm

 

 

 

 

 

 

 

3 A

35 ft. (11 m)

56 ft. (17 m)

89 ft.

(27 m)

141 ft. (43 m)

0.50 Ohm

 

 

 

 

 

 

 

Notes:

•Max Distance = distance from SPS/RPS to last appliance.

•This table is calculated at 49 degrees Centigrade (120 degrees Fahrenheit). If you are installing in locations that could be exposed to higher temperatures, refer to NEC Tables 7 and 8 in NFPA code, or applicable local standard.

•Distances are based on a 3 V drop, and take into account the worst-case panel output voltage. These distances are worst case to allow for one single load at the furthest point.

•If circuit integrity wire is used instead of housing cable in a fire-rated enclosure, reduce wiring distances by 38 feet (12 m) for every 10 feet (3 m) of potential exposure.

•For other wire gauges (e.g. 4 mm2) multiply the distance specified for the nearest wire size by the ratio of the wire area, e.g. for 3A on 4 mm2 look up 3A on 12AWG (3.3 mm2) and multiply the resulting 43m x 4.0/3.3 = 52m.

Continued on next page

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Tyco 4100U installation manual Class a NAC Wiring Table
Page 113 Page 115

4100U specifications

The Tyco 4100 series, which includes the 4100U, 4120, and 4020 models, represents a significant evolution in fire alarm and detection systems. These systems are designed to meet the needs of commercial, industrial, and institutional environments, ensuring reliable safety and compliance with the latest regulatory standards.

One of the primary features of the Tyco 4100 series is its modular design. This allows for easy expansion and customization to meet diverse application requirements. The systems support a wide range of detectors, initiating devices, and notification appliances, providing flexibility for different building layouts and fire protection needs.

The 4100U model is particularly noted for its powerful processing capabilities, utilizing advanced digital technology to enhance the speed and accuracy of fire detection. It includes sophisticated algorithms that optimize response times and reduce false alarms, ensuring that the system is both responsive and reliable during emergencies.

The 4120 model is tailored for larger facilities, incorporating advanced networking features that enable communication between multiple control panels. This interconnectedness is crucial for managing complex building systems, allowing for centralized monitoring and control. It integrates with a variety of life-safety systems and can be configured to accommodate a vast number of addressable points, making it ideal for expansive installations.

The 4020 model serves as a cost-effective solution for smaller establishments while maintaining essential functionalities. It focuses on delivering essential fire alarm capabilities without compromising on performance. Despite its more compact design, the 4020 still offers support for numerous devices and can be integrated into larger systems if needed.

All models in the 4100 series leverage modern communication technologies, offering network integration capabilities that enhance their usability. They support various communication protocols, including Ethernet, which facilitates remote monitoring and maintenance options via web-based interfaces. This ensures that system administrators can manage alerts and notifications from anywhere, streamlining incident response.

In summary, the Tyco 4100 series, featuring the 4100U, 4120, and 4020 models, stands out for its adaptability, technological advancements, and versatility. Their robust design caters effectively to diverse environments, making them a preferred choice for fire alarm and safety solutions in various sectors. Companies can rely on these systems not only for compliance but also for enhanced safety and operational efficiency.
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