Nac Wiring - Honeywell Fire-Lite Alarms MS-9050UD Manual

E.1 NAC Wiring
The following table lists NAC wiring requirements for the FACP.
Max.
allowable
total loop
NAC Load resistance
(Amps) (ohms)
0.25 13.20
0.5 6.60
0.75 4.40
1 3.30
1.25 2.64
1.5 2.20
1.75 1.89
2 1.65
2.25 1.47
2.5 1.32
Notes: Calculations are based on Direct-Current Resistance data for uncoated copper wire, per
National Electrical Code (2005 Edition) Table 8, Conductor Properties.
MS-9050UD PN 52413:C 01/23/08
Table E.2 NAC Wiring Requirements for FACP
CLASS-B
Max. allowable wire pair length
(feet)
AWG 12 AWG 14 AWG 16
solid solid solid
3420 2150 1350
1710 1075 675
1140 717 450
855 537 337
684 430 270
570 358 225
489 307 193
427 269 169
380 239 150
342 215 135
CLASS-A
Max. allowable wire pair length
AWG 18 AWG 12 AWG 14
solid solid solid
849 1710 1075
425 855 537
283 570 358
212 427 269
170 342 215
142 285 179
121 244 154
106 214 134
94 190 119
85 171 107
Wire Requirements
(feet)
AWG 16 AWG 18
solid solid
675 425
337 212
225 142
169 106
135 85
112 71
96 61
84 53
75 47
67 42
197