12 Publication 2100-IN012C-EN-P - April 2009
Chapter 1 General Information
The CENTERLINE MCC is also available with ArcShield. ArcShield
includes arc resistant features which are intended to help provide
enhanced protection to you during internal arcing faults (when
compared to MCCs which are only designed to meet UL 845
requirements). Arcing faults can be caused, for example, by accidental
touching, closing into faulted lines, or loose connections. Depending
on the application, ArcShield can provide up to Type 2 accessibility
per IEEE standard C37.20.7, which helps protect you when you are
located at the front, sides, and rear of the enclosure in the unlikely
event of an arcing fault.
A label on the MCC with ArcShield provides information in regard to
the accessibility level and arc fault ratings.
For more information about accessibility levels, performance, and
testing requirements, refer to IEEE standard C37.20.7, IEEE Guide for
Testing Metal-Enclosed Switchgear Rated up to 38 kV for Internal
Arcing Faults.
ArcShield provides a reinforced MCC structure and arc-containment
latches on all doors. To help protect you during an arc-fault,
arc-containment latches, when closed and latched properly, allow
pressure relief and help keep the doors from unlatching or detaching
from the structure.
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