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Wiring Details
Cabling to the
NCU/NEU
Connecting the N2
Communications
Line
Field Wiring
12 Point Multiplex Modules—Multiplex Binary
Since the XBN and its associated power supply are both in modular form,
the act of installing the module onto a base frame also makes all of the
wiring connections for it. Only the field and communication wires need to
be terminated.
The XBN withstands high levels of transient-voltage noise, which makes it
possible to simply use individual, small gauge (14-28 AWG) wire and still
yield excellent results. Apply the following guidelines when wiring
through conduits or wire channels to the XBN:
1. Installations can typically use individual wires (stranded or solid),
depending on local codes.
2. If an installation is expected to be in an extremely noisy environment
(e.g., TV/radio stations or radar installations), a twisted pair cable
provides greater noise immunity, leading to higher reliability.
Shielding reduces noise even more, but it is not considered a necessity.
This is true for all types of connections: voltage input or contact input.
3. Output wires may run with input wires (provided electrical codes are
met) within the same conduit or wire channel.
4. The wire/cable insulation must meet code requirements.
For details about connecting the XBN to the N2 Bus, refer to the N2
Communications Bus Technical Bulletin in this manual.
On the base frame, the field connections are provided in the form of screw
terminal blocks. Each terminal location can handle a maximum size of
one 14 AWG or two 18 AWG wires (to daisy chain), or a minimum size of
28 AWG wire.
Each field connection may require three screw terminals, two for signal
and one for an optional shield.
Contact Inputs
The contact inputs can be wired without concern for polarity, although
consistency in wiring (+) and (-) lines is recommended for both service
and safety purposes.
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