Rockwell Automation Publication 6000-IN100B-EN-P - October 2020
35
Chapter 2 Drive Electrical Installation
•
do not damage the grounding circuit
•
will not interfere with or damage the protection or metering systems, or
cause undue disturbance on power lines.
Power Cable Insulation
Requirements
Incoming line power cable ratings are shown on the Electrical Drawings and
reflect what would typically be supplied, based on line voltage rating.
All voltage ratings for outgoing motor cables that are shown are line-to-ground
rated power-frequency voltages and line-to-line power-frequency voltages.
Select cables of appropriate voltage classes when the incoming line grid-side
voltage class differs from the outgoing line motor-side voltage class.
Standard power cable ratings commercially available can vary in different
regions around the world. Cable must meet the minimum line-to-ground and
line-to-line requirements.
Power Cable Design
Considerations
Use fire retardant cables for the drive input/output connections.
Shielded or unshielded cable can be used based on the criteria that are
considered by the distribution system designer and national and local
electrical codes.
If shielded power cables are used, connect the shield of the main input/output
power cables with the general grounding point of the drive. Ground the drive
output protective grounding connection separately, and only at the drive side.
Comply with the maximum tensile stress and the minimum curvature radius
that is recommended by the cable manufacturer.
Table 4 - Cable Insulation Requirements for Outgoing Motor Cables
System Voltage
(V, RMS)
Minimum Insulation Rating (kV) - Motor Side
Line-to-Ground Rated Power
Frequency Voltage U
o
Line-to-Line Rated Power
Frequency Voltage U
2300
≥1.7
≥2.8
2400
≥1.7
≥2.8
3000
≥2.3
≥3.9
3300
≥2.3
≥3.9
4000
≥2.8
≥4.8
4160
≥2.8
≥4.8
6000
≥4.0
≥6.9
6300
≥4.5
≥7.8
6600
≥4.5
≥7.8
6900
≥4.8
≥8.3
10,000
≥6.4
≥11.1
11,000
≥7.2
≥12.5
IMPORTANT
Follow the recommended field power cabling insulation levels to help
ensure trouble-free startup and operation. The cable insulation level
must be increased over that which would be supplied for an across-the-
line application with the same rated line-to-line voltage.
