Rockwell Automation 1557 MEDIUM VOLTAGE AC DRIVE - Manual (Page 197)

INSTALLATION 8-11
1557-UM050F-EN-P – June 2013
The following table, Table 8.9, identifies general wire categories that will be encountered when installing
the Bulletin 1557 drive system. Each category has an associated wire group number that is used in the
following sections to identify the wire to be used. Application and signal examples along with the
recommended type of cable for each group are provided. A matrix providing the recommended minimum
spacing between different wire groups run in the same tray or separate conduit is also provided.
For Tray: Recommended spacing between different wire groups in the same tray.
For Conduit: Recommended spacing for wire groups in separate conduit – inches (mm).
Wire
Category
Wire
Group
Application
Signal
Example
Recommended
Cable
Wire
Group
Power
1
Power
2
Control
3
Control
4
Signal
5
Signal
6
Power
1
AC Power
(> 600V AC)
2.3 kV, 3 
AC Lines
Per NEC
Local Codes and
Application
Requirements
In
Tray
9.00
(228.6)
9.00
(228.6)
9.00
(228.6)
9.00
(228.6)
Between
Conduit
3.00 (76.2)
Between Conduit
2
AC Power
(TO 600V AC)
480V, 3 
Per NEC
Local Codes and
Application
Requirements
In
Tray
9.00
(228.6)
9.00
(228.6)
6.00
(152.4)
6.00
(152.4)
Between
Conduit
3.00 (76.2)
Between Conduit
Control
3
115V AC
or 115V DC
Logic
Relay Logic
PLC I/O
Per NEC
Local Codes and
Application
Requirements
In
Tray
9.00
(228.6)
6.00
(152.4)
9.00
(228.6)
6.00
(152.4)
115V AC
Power
Power Supplies
Instruments
Between
Conduit
3.00 (76.2)
Between Conduit
4
24V AC
or 24V DC
Logic
PLC I/O
Per NEC
Local Codes and
Application
Requirements
In
Tray
9.00
(228.6)
6.00
(152.4)
6.00
(152.4)
9.00
(228.6)
Between
Conduit
3.00 (76.2)
Between Conduit
Signal
5
Analog Signals
DC Supplies
5-24V DC Supplies
Belden 8760
Belden 8770
Belden 9460
Digital
(Low Speed)
Power Supplies
TTL Logic Level
6
Digital
(High Speed)
Pulse Train
Input Tachometer
PLC Communications
Belden 8760
Belden 9460
Belden 9463
All signal wiring must be run in separate steel conduit.
A wire tray is not suitable.
The minimum spacing between conduits containing different
wire groups is 3.00 inches (76.2 mm).
Belden 8760 - 18 AWG, twisted pair, shielded
Belden 8770 - 18 AWG, 3 conductor, shielded
Belden 9460 - 18 AWG, twisted pair, shielded
Belden 9463 - 24 AWG, twisted pair, shielded
Note 1: Steel conduit or cable tray may be used for all Bulletin 1557 power or control wiring, and steel conduit is required for all Bulletin 1557 signal
wiring. All input and output power wiring, control wiring or conduit should be brought through the drive conduit entry holes of the enclosure. Use
appropriate connectors to maintain the environmental rating of the enclosure. The steel conduit is REQUIRED for all control and signal circuits,
when the drive is installed in European Union countries. The connection of the conduit, to the enclosure shall be on full 360 degree and the
ground bound at the junction shall be less than 0.1 ohms. In EU countries this is a usual practice to install the control and signal wiring.
Note 2: Spacing between wire groups is the recommended minimum for parallel runs of 200 feet or less.
Note 3: All shields for shielded cable must be grounded at the drive end only. The other end must be insulated and remain floating. Shields for cables
from one enclosure to another must be grounded only at the source end cabinet. If splicing of shielded cables is required, the shield must
remain continuous and insulated from ground.
Note 4: AC and DC circuits must be run in separate conduits or trays.
Note 5: Voltage drop in motor leads may adversely affect motor starting and running performance. Installation and application requirements may dictate
that larger wire sizes than indicated in NEC guidelines be used.
Table 8.9 – Wire Group Numbers