Rockwell Automation 284 ArmorStart User Manual - Manual (Page 59)

Installation and Wiring 2-35
Group Motor Installations for USA
and Canada 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 the USA and
Canada.
Note: For additional information regarding group motor
installations with the ArmorStart Distributed Motor
Controller, see Appendix C.
Wiring and Workmanship
Guidelines In addition to conduit and seal-tite raceway, it is acceptable to utilize
cable that is dual rated Tray Cable, Type TC-ER and Cord, STOOW,
for power and control wiring on ArmorStart installations. In the USA
and Canada installations, the following guidance is outlined by the
NEC and NFPA 79.
In industrial establishments where the conditions of maintenance and
supervision ensure that only qualified persons service the installation,
and where the exposed cable is continuously supported and protected
against physical damage using mechanical protection, such as struts,
angles, or channels, Type TC tray cable that complies with the crush
and impact requirements of Type MC (Metal Clad) cable and is
identified for such use with the marking Type TC-ER (Exposed
Run)* shall be permitted between a cable tray and the utilization
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 utilization equipment
shall be provided by an equipment grounding conductor within the
cable.
*Historically cable meeting these crush and impact requirements
were designated and marked “Open Wiring”. Cable so marked is
equivalent to the present Type TC-ER and can be used.
While the ArmorStart is intended for installation in factory floor
environments of industrial establishments, the following must be
taken into consideration when locating the ArmorStart in the
application: Cables, including those for control voltage including
24V DC and communications, are not to be exposed to an operator or
building traffic on a continuous basis. Location of the ArmorStart to
minimize exposure to continual traffic is recommended. If 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.