ADT Unimode 400 Multi-Net Installation Manual page 183

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Circuit Type
SLC Loop
(power-
limited
EIA-485
(power-
limited)
EIA-232
(power-
limited)
M500M,
M501M
(power-
limited)
M500CH
(power-
limited)
24 VDC
Power
Runs
(power-
limited)
NR45-24
Unimode 400 Installation PN 50710:A 10/22/97
Each type of circuit within the Fire Alarm Control System requires use of a specific
wire type to ensure proper circuit operation. The wire gauge of a particular circuit
depends on the length of that circuit. Use Table B-1 to determine the specific wiring
requirements for each circuit.
Compliance with the Federal Communications Commission (FCC) and Canadian
Department of Communication regulations on electrical energy radiation requires the
following: Use twisted-pair shielded wire for any wiring entering or exiting the
Unimode 400 cabinet that is not enclosed in conduit.
Circuit
Wire Requirements
Function
Connects to Twisted-shielded pair, 12
intelligent and to 18 AWG. 40 ohms,
addressable maximum per length of
modules. Style 6 and 7 loops.
40 ohms per branch
maximum for Style 4
loops.
Untwisted, unshielded
wire, in conduit or
outside of conduit.
Connects to Twisted-shielded pair
ADT-LCD-80 or with a characteristic
to Annunciator impedance of 120 ohms.
Control System 18 AWG minimum.
(ACS) modules
Connects to Twisted-shielded pair.
PRN, P40 18 AWG minimum.
Remote Printers,
CRT, or PC.
Initiating Device 12-18 AWG. Maximum
Circuit (IDC) circuit resistance is
20 ohms.
Notification 12-18 AWG. MPS-24A:
Appliance At alarm current level,
Circuit (NAC) no more than a 1.2 V
drop at the end of the
circuit, or sized to
provide the minimum
rated operating voltage
of the appliances used.
To annunciators 12-18 AWG. Size wire
and M500CH so that no more than
1.2 V drop across wire
run from supply source
to end of any branch.
Remote 12 AWG in conduit.
Secondary
Power Source
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Distance
Typical Wire Type
(feet)
10,000 12 AWG Belden 9583 WPW 999 Genesis 4410
8,000 14 AWG Belden 9581 WPW 995 Genesis 4408
4,875 16 AWG Belden 9575 WPW 991 Genesis 4406
3,225 18 AWG Belden 9574 WPW 975 Genesis 4402
1,000 18-12 AWG
6,000 (max) Belden 9860 (16 AWG)
50 (without Belden 9860 (16 AWG)
modem)
To meet 20 12-18 AWG
ohms
To meet 12-18 AWG
1.2 V drop,
or sized to
provide the
minimum
rated
operating
voltage of the
appliances
used.
To meet 1.2 12-18 AWG
volt drop
20 (max) 12 AWG
B-1