Rockwell Automation 1336T Wiring and Grounding Guide, (PWM) AC Drives - Manual (Page 18)

18 Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014
Chapter 1 Wire/Cable Types
Because noise containment can be affected by incidental grounding of the armor
to building steel when the cable is mounted, we recommend that the armored
cable has an overall PVC jacket (see
Chapter 2 ).
Interlocked armor is acceptable for shorter cable runs, but continuous welded
armor is preferred. General recommendations for ground conductors are listed
here:
• Cable with a single ground conductor is sufficient for drive sizes up to and
including 200 Hp (150 kW).
• Cable with three ground conductors is recommended for drive sizes 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 9 - Armored Cable with Three Ground Conductors
A good example of cable for Type 5 installation is Anixter 7V-5003-3G. This
cable has three XLPE insulated copper conductors, 25% minimal overlap with
the helical copper tape, and three bare copper grounds in PVC jacket.
IMPORTANT If a terminator network or output filter is used, the connector insulation must
be XLPE, and not PVC.
Cable with Three Ground Conductors Cable with a Single Ground Conductor
G
R
B W
G
G
G R
B W
Conductors with XLPE
Insulation
Optional Foil/Copper Tape
and/or Inner PVC Jacket
Armor
Optional PVC Outer Sheath