Wire Requirements - Johnson Controls Metasys IFC-200 Installation Procedures Manual

Table 12: IFC-200 Wire Requirements
Circuit Type Circuit Function
SLC Connects to Intelligent
(Power and Addressable
Limited) Modules
RS-485 Connects to LCD-80 or
(power to Annunciator Control
limited) System Modules
RS-232 Connects to PRN-3 or
P40 Remote Printers,
(power
limited) CRT-1, and to PC
M500MJ, Initiating Device Circuit
M501MJ
M502MJ
(power
limited)
M510CJ Indicating Appliance
(power Circuit
limited)
24 VDC Power To Annunciators; to
Runs M510CJs;
(power
limited)
Remote Secondary
NR45-24
Power Source

Wire Requirements

Each of the various types of circuits within an IFC-200 Fire Control
System has a specific type of wire that must be used in order to ensure
proper operation. In addition, the wire gauge of a particular circuit is
contingent on the length of that circuit. Use the table below to determine
the specific wiring requirements for each circuit.
Note: If the SLC loop is run in conduit with indicating appliance circuits,
employ only electronic sounders, such as the MA/SS-24. This
greatly reduces the risk of encountering problems caused by using
more electronically noisy indicating appliances, such as electro-
mechanical bells or horns.
Wire Requirements
Twisted-shielded pair,
12 to 18 AWG. 40 ohms
maximum per length of
Style 6 and 7 loops.
40 ohms per branch
maximum for Style 4 loops.
Untwisted, unshielded wire,
in conduit or outside of
conduit.
Twisted-shielded pair.
18 AWG minimum.
Twisted-shielded pair.
18 AWG minimum.
12-18 AWG. Maximum IDC
wire resistance is 20 ohms.
12-18 AWG. MPS-24A: At
alarm current level, no more
than a 1.2 volts drop at the
end of the circuit.
12-18 AWG. Size wire so
that no more than 1.2 volts
drop across wire run from the
supply source to end of any
branch.
12 AWG in conduit.
Hardware Installation—IFC-200 Hardware Installation Procedures
Distance Typical Wire Type
(Feet)
10,000 Belden 9583 (12 AWG)
8,000 Belden 9581 (14 AWG)
4,875 Belden 9575 (16 AWG)
3,225 Belden 9574 (18 AWG)
1,000 12-18 AWG
6,000 (max) Belden 9575
(16 AWG)
50 (without Belden 9575
modem) (16 AWG)
To meet 12-18 AWG
20 ohms
To meet 12-18 AWG
1.2 volt drop
To meet 12-18 AWG
1.2 volt drop
20 (max) 12 AWG
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