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Rockwell Automation Publication 2100-IN012D-EN-P - September 2010
Chapter 6
Operator Handle and Unit Interlock
Units can also be locked out with a padlock preventing installation of the unit
into a vertical section. The lockout feature of the unit interlock can be used with a
padlock to keep the interlock in an extended position, which will prevent the unit
from being inserted into an MCC section. The unit interlock can also be used
with the unit installed in the section, but partially removed from the section.
In this position, the unit is partially removed from the MCC and the slot in the
interlock plate is in line with the flange of the unit support pan above this unit.
When the unit is locked in this position, the unit power and ground stabs are
disengaged. This position can be used to prevent insertion of a unit into the
MCC.
Figure 37 - Unit Interlock to Prevent Insertion - Vertical Operating Handler
ATTENTION:
When working on or near energized electrical equipment,
follow established electrical safety-related work practices. Refer to NFPA
70E Standard for Electrical Safety in the Workplace.
We recommend that maintenance performed on the MCC units be performed
away from the MCC in a suitable work area, when possible.
