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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.

Cable Size for PWR and COM Connections

20 AWG Belden #9402 or equivalent, two-pair

20 AWG Belden #1075A or equivalent, two-pair

14 AWG *

12 AWG *

* Use 12 or 14 AWG cable for PWR and COM connections 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

Section 1 Installation

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.

Maximum length per run, meters (ft.)

Number of Modules (ATS, PIM,

Indoor or

Outdoor In-

1 Module

stallation

Indoor

61 (200)

Outdoor

61 (200)

—

152 (500)

—

152 (500)

or Load Shed Kit

per Run

2 Modules

3 Modules

31 (100)

152 (500)

122 (400)

152 (500)

TP-6984

)

(67)

5/17a