Rockwell Automation 1336T Wiring and Grounding Guide, (PWM) AC Drives - Manual (Page 17)

Rockwell Automation Publication DRIVES-IN001M-EN-P - March 2014 17
Wire/Cable Types Chapter 1
Type 2 Installation
An acceptable shielded cable for Type 2 installations is essentially the same cable
as Type 1, plus one shielded pair of brake conductors. For more information on
Type 2 installations, refer to
Table 1 on page 14 .
Figure 8 - Type 2 Installation — Shielded Cable with Brake Conductors
Type 3 Installation
These cables have 3 XLPE insulated copper conductors, 25% minimal overlap
with helical copper tape, and three bare copper grounds in PVC jacket.
Armored Cable
Cable with continuous aluminum armor is often recommended in drive system
applications or specific industries. Armored cable offers most of the advantages of
standard shielded cable and also combines considerable mechanical strength and
resistance to moisture. It can be installed in concealed and exposed manners and
removes the requirement for conduit (electrical metallic tubing [EMT]) in the
installation. It can also be directly buried or embedded in concrete.
B R
G W
Drain Wire for Brake
Conductor Shield
Shield for Brake
Conductors
TIP Other types of shielded cable are available, but the selection of these types can
limit the allowable cable length. Particularly, some of the newer cables twist four
conductors of THHN wire and wrap them tightly with a foil shield. This
construction can greatly increase the cable charging current required and reduce
the overall drive performance. Unless specified in the individual distance tables
as tested with the drive, these cables are not recommended and their
performance against the lead length limits supplied is not known. For more
information about motor cable lead restrictions, refer to,
Conduit on page 67 ,
Moisture on page 72 , Effects On Wire Types on page 73 , and Appendix A .