Rockwell Automation Publication 2100-IN012G-EN-P - August 2016 69
Chapter 6
Operator Handle and Unit Interlock
The operator handle is an integral part of each MCC unit. Adjustment of the
handle is not required. The operator handle is interlocked with each unit door
as outlined by UL 845.
Defeating the Unit Door
Interlock
Refer to the following information for defeating the unit door lock.
Open the Door When Operating Handle Is in the ON/I Position
When the unit door is closed and the operator handle is in the ON/I position,
a defeater screw must be deliberately operated to open the unit door (for
example, opening the door of an energized unit).
The defeater screw is just below (on units with a vertically mounted operator
handle) or just to the right (on units with a horizontally mounted operator
handle) of the pivot point of the operator handle. To operate the defeater
mechanism and defeat the door interlock while the operator handle is in the
ON/I position, use a flat-head screwdriver to turn the defeater screw clockwise
one-eighth to one-quarter turn.
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.
ATTENTION: Opening the door reduces arc flash safety.
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.
Personal protective equipment (PPE) is not shown for clarity.
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