14
All wiring is 18 AWG (0.8231 mm
2
) (minimum) to 12 AWG (3.309 mm
2
) (maximum).
All wiring is supervised and power-limited.
The maximum alarm current is 3 A per circuit. The supervisory current is 2.03 mA at
24 VDC.
The nominal voltage rating is 24 VDC, 2 V p-p ripple (maximum).
The total available current from the SPS or RPS is 9 A unless it is used for regulated 24
VDC notification appliances, where the SPS/RPS is rated for 4 Amps notification current
and 1Amp for other uses. Total auxiliary power current is 5 A (1 Amp for regulated 24
VDC), and rated at 2 A per circuit. Any current used for card power by modules plugged
into the PDI, as well as any auxiliary 24 VDC current, must be deducted from the total
available current.
All wiring that leaves the building requires overvoltage protection. Install module
2081-9044 (3 A) or 2081-9028 (1/4 A) inside a UL-Listed electrical box wherever wire
enters or exits the building. When using the 2081-9044, the maximum alarm current is
reduced to
1/4 A for that part of the circuit downstream of the module. Refer to 574-805 for
installation instructions of 2081-9028 modules or to 574-832 for installation instructions of
2081-9044 modules.
Terminal designations “+” and “-” are for the alarm state.
A maximum of 70 appliances can be supported per circuit.
For CE systems, use ferrite beads as shown in each figure. 4100-5129 includes three ferrite
beads, order as needed. Loop wires once through the ferrite bead(s) as shown below:
Figure 6. Loop through Ferrite Bead
If Wheelock appliances employing EZ Mount SNAP bases are used, reduce the wiring
distance and wiring resistance by:
12 gauge wire: 7 feet per appliance, 0.025 Ohms per appliance
14 gauge wire: 4.4 feet per appliance, 0.025 Ohms per appliance
16 gauge wire: 2.8 feet per appliance, 0.025 Ohms per appliance
18 gauge wire: 1.8 feet per appliance, 0.025 Ohms per appliance
Continued on next page
NAC Field Wiring,
Continued
Guidelines
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