Rockwell Automation 1336T Wiring and Grounding Guide, (PWM) AC Drives - Manual (Page 13)

Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014 13
Wire/Cable Types Chapter 1
Gauge
The correct wire size is determined by a number of factors. The user manual for
each drive lists a minimum and maximum wire gauge based on the amperage
rating of the drive and the physical limitations of the terminal blocks. Local or
national electrical codes also set the required minimum gauge based on motor
full load current (FLA). Follow both of these requirements.
Number of Conductors
Local or national electrical codes can determine the required number of
conductors. Generally, these configurations are recommended:
• Figure 2 shows cable with a single ground conductor that is recommended
for drives up to and including 200 Hp (150 kW).
• Figure 3 shows cable with three ground conductors that is recommended
for drives larger than 200 Hp (150 kW).
Space the ground conductors symmetrically around the power conductors. Verify
that the ground conductors are rated for full drive ampacity.
Figure 2 - Cable with One Ground Conductor
Figure 3 - Cable with Three Ground Conductors
B R
G W
One Ground Conductor
Three Ground Conductors