61Publication 2100-IN012C-EN-P - April 2009 61
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 the 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 located 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.
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