Chapter 2. Installation/System Checkout
2-8
Remote Annunciator Comm Wiring
• All remote annunciator wiring to be 18 AWG (min.) to
12 AWG (max.), twisted-pair or shielded twisted pair.
• Conductors must test free of all grounds and stray volt-
ages before connection to appliances and panel.
• All wiring is supervised and power limited.
• Refer to installation instructions packed with each
Remote Annuciator Module (RAM) for connection
details.
• Remote Annunciator Modules require power and com-
munications wiring.
• For “bus-style” wiring, maximum wiring limit is 4, 000
feet. Maximum wiring capacitance is .58 uF total, wire-
to-wire plus wire to shield. Attach Simplex Model 733-
974) 100 ohm, 1/2 W harness (see “A” in figure below)
for line matching. Wire remote devices “daisy-chain”
style, using the in/out terminals on each device.
• For “T-Tap” style wiring, total cable limit is 10, 000
feet, 2, 500 feet to the furthest device. Maximum wiring
capacitance is .58uF total, wire-to-wire plus wire-to-
shield. Attach Simplex Model 733-974 100 ohm, 1/2W
harness (see “A” in figure below) for line matching.
• Shielded wire is not required for most installations. If
communications wiring is not in conduit with strobes,
voice speaker circuits, or signaling line circuits,
shielded wire is not required. Use shielded wiring if in
same conduit as those circuits. Terminate shield to 0V
(Aux 24V negative terminal) or to chassis.
• If wiring is routed outside the building, use of a listed
secondary protector is required. Use Simplex Number
2081-9028 or 2081-9044. A protector must be installed
at each building exit/entrance. Each 2081-9028 adds .2
ohm wiring resistance. Each 2081-9044 adds 6 ohms
wiring resistance. Use of the 2081-9044 will signifi-
cantly reduce wiring distance.
• Wiring must pass through a ferrite bead. Wrap the wir-
ing twice through the ferrite bead, as shown in
Figure 2-9.
Figure 2-9 Ferrite Bead
Figure 2-10 Remote Annunciator
Wiring Connections
Figure 2-11 Bus Style and T-Tap Wiring
TB1 TB2
1 2 3 4 5 6 7 8 1 2 3 4 5 1 2 3 4 5 6 7 8
TB3
N2 COMMS
0V SHIELD CONNECTION
(IF USED)
MAIN SYSTEM BOARD - ADDRESSABLE (MSB - A)
MSB
MSB
RAMRAM
RAM
RAM
RAM
RAM
RAM
T-Tap Style Wiring
Bus Style Wiring
A
A
A
RAM = Remote Annunciator Module
MSB = Main System Board
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