4 LCX 890 Installation Guide
Note
You must use shielded cables for Infinet to ensure compliance with the
Class A FCC limits and to provide reliable communications.
Cables that form Infinet are 24-gauge (.22 to .38 mm
2
), single-twisted-
pair, tinned, shielded copper wire. Use the following cables
1
or their
equivalents:
• Brand Rex # H 9002 (single-pair)
• Anixter # 9J2401021 (single-pair plenum cable)
The cable should have a nominal impedance of 100 Ω and a nominal ve-
locity of propagation of 78%.
Capacitance of Infinet cable should be nominal, below 12.5 pF/ft (41 pF/
m) between conductors and below 22 pF/ft (72 pF/m) between the con-
ductor connected to ground and the next conductor.
Lightning Protection
The LCX 898 has a 2 A, 500 V fuse and 1500 V transformer that isolates
the unit.
The unit has 1500 V .01 µF spark gap caps from HOT and NEUTRAL
to chassis ground. These help increase protection against power surges.
Lightning arrestors are required at each point where a bus cable enters
or exits a building. Use the following arrestor:
Two pair gas tube arrestor, Andover Controls # 01-2100-299.
1. You can also use any cables you may already have in place for ACNET or LBUS.
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