GE Industrial Solutions Evolution Series E9000 - Manual (Page 5)

4
Evolution Series E9000 Installation & Maintenance Guide
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 2 shows a horizontal power bus
with its Lexan barrier. Figure 3 shows the bus barrier
mounting slots and screw.
The vertical bus, either 300A 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.
A continuous horizontal ground bus, sized in accordance
with the National Electrical Code, is provided near the
bottom of all motor control centers.
A 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.
Figure 2. Horizontal bus with Lexan barrier
Figure 3. Horizontal bus barrier mounting slot and screw
General Description –
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. Units above 600 A may be fixed (bolt-
ed) in place and are either bus or cable connected.
Installation and operation of units are described else-
where in this guide.
Loosen screw,
lift and pull
barrier forward