Rockwell Automation 1336T Wiring and Grounding Guide, (PWM) AC Drives - Manual (Page 15)

Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014 15
Wire/Cable Types Chapter 1
Unshielded Cable
Properly designed multi-conductor cable can provide superior performance in
wet applications, significantly reduce voltage stress on wire insulation, and reduce
cross coupling between drives.
The use of cables without shielding is generally acceptable for installations where
electrical noise created by the drive does not interfere with the operation of other
devices, such as communication cards, photoelectric switches, weigh scales, and
others. Verify that the installation does not require shielded cable to meet specific
electromagnetic compatibility (EMC) standards for CE, C-Tick, or FCC
requirements. Cable specifications depend on the installation type.
Type 1 and Type 2 Installation
Type 1 or Type 2 installations require 3-phase conductors and a fully rated
individual ground conductor with or without brake leads. Refer to
Table 1 on
page 14 for detailed information and specifications on these installations.
Figure 5 - Type 1 Unshielded Multi-conductor Cable without Brake Leads
Type 3 Installation
Type 3 installation requires three symmetrical ground conductors whose
ampacity equals the phase conductor. Refer to
Table 1 on page 14 for detailed
information and specifications on this installation.
Figure 6 - Type 3 Unshielded Multi-Conductor Cable
Type 1 Installation, without Brake Conductors
G R
B W
Single Ground
Conductor
PVC Outer
Sheath
Filler
G R
B W
G
G
Multiple Ground
Conductors
PVC Outer
Sheath
Filler