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E VOLUTI ON S E R I E S E9 0 0 0
M OTO R CO N T R O L C EN T ER
General description – arc-resistant
The arc-resistant sections are built with increased
structural capacity. The main enhancements are
thicker gage of steel, latches, hinges, and metallic
PD brackets. In addition, there are two versions
available with and without a plenum. The plenum
option adds 12-inches to the top of the 90-inch
section. The plenumless option should have a 4'
clearance on top of the MCC. The top (12-inch high)
horizontal wireway door and the bottom (6-inch
high) wireway door utilize multi-turn latches to
secure the doors. The remaining latches are ¼ turn
(with options for closed status indication). There is
no variation in the units between arc-resistant and
standard E9000 other than the unit door.
Additionally, the Arc Flash Mitigation units are
compatible in arc-resistant design with arc-
resistant/Arc flash Mitigation door.
General description –
motor control center buses
The main horizontal power bus is located at the top
of the vertical section. The bus bolted joints are
accessible from the front by loosening the barrier
mounting screws and sliding the Lexan® bus barrier
up and forward from the main bus. Figure 2A shows
a horizontal power bus with its Lexan barrier. For
arc-resistant design, uses this same Lexan barrier
with additional Metallic dead front barrier. Figure
2B shows the 2500 A without fans and the
3000/3200 A main horizontal bus configuration.
The vertical bus, either 300 A or 600/850 A, is
connected with two bolts per phase to the main
bus. The phase relationship is A–B–C from top to
bottom and left to right, as viewed from the front.
2500 A Type 12 construction without fans will be
limited to 700A vertical bus.
A continuous horizontal ground bus, sized in
accordance with the National Electrical Code, is
provided near the bottom of all motor control
centers.
An optional vertical ground bus can be provided in
each section providing additional grounding. A
neutral bus is provided, when specified, in the
bottom of the incoming section or in the bottom of
all enclosure(s) as specified.
As shown in Figure 3, the arc-resistant MCC will
include a metallic main bus barrier in addition to
the standard Lexan barrier.
General description –
motor control center units
Consult Publication DET-291 for detailed listings of
Evolution MCC units.
Plug-in units are supplied with stabs rated at either
250 A or 600 A. Arc Flash Mitigation (AFM) units are
supplied with retractable stabs, mechanical
interlocks, racking screw, and visual stab and
shutter indicators. AFM units are available in
plug-in or stab-bolt configuration.
Installation and operation of units, both standard
and AFM, are described on page 18 of this guide.
—
02A
—
02B
—
03
—
02A
Horizontal bus with
Lexan barrier
—
02B
2500A without fans,
3000/3200 A main
horizontal bus
—
03
Metallic horizon-
tal bus barrier for
arc-resistant design
