Appendix D: Wire Requirements; D.1: Gf-505 Nac Wiring - Honeywell GF505 Manual

Connecting external system accessories to the main circuits must be carefully considered to ensure proper operation. It is important to
use the correct type of wire, gauge and run length for each circuit. Reference the chart below to specify wire requirements and limitations
for each circuit.
CIRCUIT CONNECTIONS
Circuit Type
Initiating Device Circuit
(power-limited)
ANN-BUS (EIA-485)
power-limited
ANN-BUS Power
24 VDC Regulated,
resettable, nonresettable
Auxiliary Trouble Input
Remote Sync Output
NAC Outputs
D.1 GF-505 NAC Wiring
The following table lists NAC wiring requirements for the GF-505 FACP which utilizes the FLPS-3 power supply.
NAC Load
(Amps)
0.25
0.5
0.75
1
1.25
1.5
1.75
2
2.25
2.5
NOTE: Calculations are based on Direct-Current Resistance data for uncoated copper wire, per National Electrical Code (2005 Edition)
Table 8, Conductor Properties.
NOTE: These distances reflect the worst case scenario and are based on the current draw of the highest candela strobes at the low end
of the supported NAC voltage with the entire load at the end of the circuit. Further distances can be achieved by performing a point to point
voltage calculation that more accurately reflects the specific devices used and how they are dispersed on the circuit.
GF505 & GF510 Manual — P/N 53164:B5 6/12/2018

Appendix D: Wire Requirements

Circuit Function
Connects to Initiating
Devices
Communication for
ANN-BUS annunciator
and relay modules
Power for ANN-BUS
annunciators
Power for accessories
and 4-wire devices
Open Collector trouble
input for CHG-75,
CHG-120, etc.
Provides strobe and
normal sync for
remote NAC power
supplies
Connects to NAC
devices or Release
devices
Table D.1 FACP Wire Specifications
Max.
allowable Max. allowable wire pair length
total loop
resistance
AWG 12 AWG 14
(ohms)
solid solid
6.00 1554 977
3.00 777 489
2.00 518 326
1.50 389 244
1.20 311 195
1.00 259 163
0.86 222 140
0.75 194 122
0.67 173 109
0.60 155 98
Table D.2 NAC Wiring Requirements for FACP with FLPS-3 Power Supply
WIRE REQUIREMENTS
Wire Type and
Limitations
Untwisted, unshielded wire Distance limitation
(maximum loop resistance set by 100 ohm
not to exceed 100 ohms) resistance limitation
Twisted pair a maximum 6,000 (1,800 m)
loop resistance of 120
ohms
Refer to Table 2.2, "Wiring Distances," on page 33 for information on device wiring
Untwisted, unshielded wire Distance limitation
set by 4 volt
maximum line drop
Single conductor Distance limitation
20 feet in same
room
Untwisted, unshielded pair Distance set by 295
wire ohm resistance
limitation
Untwisted, unshielded pair Refer to Section D.1 and Section D.2 on page 116.
wire
CLASS-B
(feet)
AWG 16 AWG 18
solid solid
613 386
307 193
204 129
153 97
123 77
102 64
88 55
77 48
68 43
61 39
Recommended
Max. Distance
Feet (meters)
12-18 AWG (3.25 - 0.75 mm
12-18 AWG (3.25 - 0.75 mm
12-18 AWG (3.25 - 0.75 mm
18 AWG (0.75 mm
12-18 AWG (3.25 - 0.75 mm
CLASS-A
Max. allowable wire pair length
(feet)
AWG 12 AWG 14 AWG 16
solid solid solid
777 489 307
389 244 153
259 163 102
194 122 77
155 98 61
130 81 51
111 70 44
97 61 38
86 54 34
78 49 31
Wire Gauge
2
)
2
)
2
)
2
)
2
)
AWG 18
solid
193
97
64
48
39
32
28
24
21
19
115