TP-6984 5/17a24 Section 1 Installation
1.10.2 Communication Cable
Specifications
RBUS Connections A and B
For the RBUS communication connections A and B to
the Model RXT transfer switch, optional PIM and/or
optional load shed kit, use 20 AWG shielded,
twisted-pair communication cable. Belden #9402
(two-pair) or Belden #8762 (single-pair) or equivalent
cable is recommended.
For outdoor installations, including those with buried
cables and/or conduit, use outdoor-rated Belden
#1075A or equivalent 20 AWG shielded, twisted-pair
communication cable.
PWR and COM Connections
For the PWR and COM connections from the generator
set to the RXT, PIM and/or load shed kit, use the second
pair in the two-pair communication cable for short runs,
or use 12--14 AWG cable for longer runs as shown in
Figure 1-22.
The maximum cable length depends on the number of
optional modules connected. A module can be a Model
RXT transfer switch, a load management device, or a
programmable interface module (PIM). See Figure 1-22
for the maximum cable lengths for 1 , 2, or 3 modules per
cable run. Note the shield connections shown in
Figure 1-24.
Note: A model RXT transfer switch with combined
interface/load management board acts as two
RBUS modules: one RXT transfer switch and one
load management device.
Note: Power relay modules, if used, are not RBUS
modules and do not have RBUS communication
connections.
Cable Size for PWR and COM Connections
Indoor or
Outdoor In-
stallation
Maximum length per run, meters (ft.)
Number of Modules (ATS, PIM, or Load Shed Kit)
per Run
1 Module 2 Modules 3 Modules
20 AWG Belden #9402 or equivalent, two-pair Indoor 61 (200) 31 (100) 21 (67)
20 AWG Belden #1075A or equivalent, two-pair Outdoor 61 (200) 31 (100) 21 (67)
14 AWG * — 152 (500) 152 (500) 122 (400)
12 AWG * — 152 (500) 152 (500) 152 (500)
* Use 12 or 14 AWG cable for PWR and COM c onnections only. For RBUS connections A and B, use shielded, twisted pair communication
cable specified in Section 1.10.2.
Figure 1-22 Total Cable Lengths for PWR and COM Connections
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