© 2021 All rights reserved. Data subject to change without notice. 21
Rev. C | 2021.12 FCS - Installation Manual
NUMBER FUNCTION
Molded-in mounting bracket
Conduit entry points
6.6 Wiring Power Supply Connections
The FCS requires a 90 - 240 VAC power supply (line voltage power). This source should be on
an independent breaker that is properly marked.
Very carefully, drill out one or more of the PVC conduit entry hole plugs located on the top,
bottom or back of the system enclosure base. Refer to Section 6.5 Standard Enclosure
Mounting Components for the locations of the conduit entry holes.
Wire the eld wiring to the Line Voltage Terminal (J15), refer to Section 5.2 Interior System
Layout (Bottom). These are the power connections and should be supplied with a minimum
3-conductor, 18 AWG stranded wiring.
All wiring should be run in EMT (or better) conduit properly grounded (earth or safety).
Building code requires low voltage wiring not to be within the same conduit as line voltage
wiring. All communications (network) wiring must be in shielded cabling. Wire shielding
must be connected together at each device and taped off so it cannot cause a short on
the circuit board when the door is closed. The wire shielding should be connected to earth
ground close to the primary supply connection only, and must have a contiguous connection
throughout the network. It should be left taped and oating at the last device in the network.
6.7 Wire Gauge vs Run Length
It is important to use the appropriate gauge of wire for the required length of the run to
ensure sucient available voltage, noise reduction, dissipation of heat, and overall optimum
performance along the entire wire run. Large wire sizes will have less voltage drop than
smaller wires sizes of the same length. Similarly, shorter wire lengths will have less voltage
drop than longer wires for the same wire size. The longer the wire run, the more attention
there should be made to preventing voltage drop.
CETCI highly recommends 4-conductor, 16 AWG, shielded, stranded wire cable types such
as AlphaWire 79220, AlphaWire 5534, Belden 9954 or equivalent. Do not use solid core
wire.
Minimum Cable Length vs Size (AWG) for Modbus® and Power Supply
Cable Length
# of
Sensors
4 6 8 10 12 14 16
Meters Feet
0.3 to 1552 1 to 500 AWG # 18 18 18 18 18 18 18
153 to 305 501 to 1, 000 AWG # 18 18 18 18 18 18 18
306 to 457 1,001 to 1,500 AWG # 18 18 18 16 16 16 16
458 to 914 1,501 to 3,000 AWG # 18 16 16 16 16 16 16
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