Rockwell Automation 284D On-Machine ArmorStart Accelerator Toolkit - Manual (Page 54)

54 Publication IASIMP-QS015C-EN-P - August 2011
Chapter 2 System Layout and Wiring
Group Motor Installations For North American and Canadian Markets
The ArmorStart distributed motor controllers are listed for use with each other in group installations per
NFPA 79, Electrical Standard for Industrial Machinery. When applied according to the group motor
installation requirements, two or more motors, of any rating or controller type, are permitted on a single
branch circuit. Group motor installation has been successfully used for many years in North America and
Canada.
Cabling and Installation Guidelines
In addition to conduit and seal-tight raceway, it is acceptable to use cable that is dual rated Tray Cable, Type
TC-ER and Cord, STOOW, for power and control wiring on ArmorStart installations. In North America and
Canada installations, the following guidelines are outlined by the NEC and NFPA 79.
In industrial environments where the conditions of maintenance and supervision ensure that only qualified
personnel service the installation, and where the exposed cable is continuously supported and protected
against physical damage by using mechanical protection, such as struts, angles, or channels, Type TC tray
cable that complies with the crush and impact requirements of type metal clad (MC) cable and is identified
for such use with the marking type TC-ER (Exposed Run) shall be permitted between a cable tray and the
use equipment or device as open wiring. The cable shall be secured at intervals not exceeding 1.8 m (6 ft) and
installed in a ‘good workman-like’ manner. Equipment grounding for the use equipment shall be provided by
an equipment grounding conductor within the cable.
Cables meeting these crush and impact requirements were designated and marked ‘Open Wiring’. Cable
marked this way is equivalent to the present Type TC-ER and can be used.
Refer to the following when installing the ArmorStart device in factory floor environments of industrial
applications.
Additionally, if conduit or other raceways are not used, we recommend that strain relief fittings be used when
installing the cables for the control and power wiring through the conduit openings.
The working space around the ArmorStart device may be minimized as the ArmorStart device does not
require examination, adjustment, servicing, or maintenance while energized. In lieu of this service, the
ArmorStart device is meant to be unplugged and replaced after proper lockout and tag-out procedures have
been employed.
ATTENTION
Cables, including those for control voltage including 24V DC and communication, are not to be exposed to
an operator or building traffic on a continuous basis. Locate the ArmorStart device to minimize exposure to
continual traffic is recommended. If the location to minimize traffic flow is unavoidable, other barriers to
minimize inadvertent exposure to the cabling should be considered. Routing cables should be done in such
a manner to minimize inadvertent exposure and/or damage.