Simplex 4100ES Installation Manual page 179

4. Repeat steps 1 through 3 for each NAC output you want to use.
5. Leave the factory installed EOL Resistor (10 K Ohm, ½ W; brown/black/orange) on each unused circuit. The circuit must connect
"B+" to "B-" terminals.
Note:
• Notification appliances are rated per individual nameplate label.
• Maintain correct polarity on terminal connections. Do not loop wires under terminals.
22.5.5 SPS IDNet Field Wiring Guidelines
22.5.5.1 IDNet Wiring
Up to 250 IDNet initiating devices are supported on the SPS IDNet channel. The SPS supports both Class A and Class B wiring.
Class A wiring allows IDNet appliances to communicate with the SPS even in the event of a single open circuit somewhere in the loop. Class
A wiring requires that two wires are routed from the SPS to each IDNet appliance, and then back again to the SPS.
Class B wiring allows "T" tapping, and therefore requires less wiring distance per installation than Class A. Additionally, Class B wiring does
not require end-of-line resistors, because each IDNet appliance communicates directly to the SPS.
22.5.5.2 Guidelines
Make sure these guidelines are accounted for before installing the cards.
• For Class B operation:
- The maximum distance to any device is 2500 feet (762 m) for 126-250 devices, or 4000 feet (1220 m) if 125 or fewer devices are
used.
- "T" taps are allowed.
- The maximum total wire allowed is 10,000 feet, or 0.58uF.
- Maximum allowed line-to-line capacitance ("+" to "-" terminals) is 0.58 uF. For applications with shielded wire, be sure that the total
capacitance from line to line plus the shield to either line is no more than 0.58 uF.
• For Class A operation, the maximum loop distance is 2,500 feet (762 m). "T" taps are not allowed.
• Use supplied ferrite beads with the SPS. Loop wires once through the supplied ferrite beads as shown in Figure 101.
page 177
Figure 100: Class B Wiring
4100ES Fire Alarm System Installation Guide
574-848 Rev. BQ