22
To connect the SPS to appliances using Class B wiring, read the following instructions and refer to
the figure below.
1. Route wire (between 12 [3.309 mm
2
] and 18 AWG [0.8231 mm
2
]) from the “B+” and “B-”
outputs on TB2 of the SPS to the appropriate inputs on a peripheral notification appliance.
Use NAC1, NAC2, or NAC3.
2. Route wire from the first appliance to the next one. “T” tapping is not allowed.
Repeat for each appliance.
3. Route wire from the last appliance to the EOLR harness (10K ohm, 1/2W: P/N 733-894,
PID# 4081-9008).
4. Repeat Steps 1 through 3 for each NAC output you want to use.
5. Leave the factory-installed 10 K, 1/2 W, brown/black/orange resistor on each unused
circuit. The circuit must connect “B+” to “B-” terminals.
The illustration below shows Class B wiring.
P1
3
2
1
B+ B- A+ A-
TYPICAL
APPLIANCE
RED BLK
NAC1
B+ B- A+ A-
NAC1
B+ B- A+ A-
NAC1
LED1 LED2 LED3
TYPICAL
APPLIANCE
10K 1/2W (133-894)
NAC2 NAC3
RED RED
RED RED
Figure 8. Class B Wiring
Notes:
Notification appliances are rated per individual nameplate label.
Maintain correct polarity on terminal connections. Do not loop wires under terminals.
NAC Field Wiring,
Continued
Class B NAC Wiring
IMPORTANT: Conductors must test
free of all grounds.
12 AWG (3.309 mm
) to
18 AWG (0.8231 mm
2
)
BLK
BLK
BLK
4081-9008 EOL Harness (10 K, 1/2 W)
You must have the EOL
Resistor (10 K Ohm, 1/2 W;
Brown/Black/Orange) on
unused circuits
NAC2 NAC3
Ferrite bead
required for
CE compliance. Use
Kit 4100-5129.
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