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S A F E G E A R ® M O T O R C O N T R O L C E N T E R /A R C - R E S I S TA N T M E TA L - C L A D C O N S T R U C T I O N
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If shorting terminal blocks are used, review the connection diagram that was shipped with the unit, for
position of shorting screws. See step 10 of the control circuit checkout.
The wiring connections are explained in Appendix C
Connection to Ground Bus
The factory bolts the ground bus bars to each frame. Connect the ground bus bars between the shipping
splits and to the station ground with a cable or bus of equal or larger gauge than the housing ground bus.
Do not run cable or bus in conduit. The cable or bus should take the most direct path to ground.
Installation of the Plenum
The MCC plenum is shipped separately in pre-assembled sections on pallets. Refer to the General Arrangement
drawings for details on the layout of the plenum.
Remove all packing material and lift plenum sections to the top of the MCC by suitable lifting means. Each
section is then bolted to the plenum base mounted on the MCC roof and also to the adjoining plenum section
with provided hardware.
Once the roof-mounted plenums are in place install additional plenum sections, for venting outside the
building, one at a time starting at the MCC boundary (see Fig. 2).
As each section is installed provide permanent support for each section, either from above or below, starting
with the first plenum section. The support should be able to brace the weight of each in accordance with
local building code requirements.
Follow the specific plenum routing shown on the General Arrangement drawings:
The exhaust vent section (see Fig. 3) should be installed in the building wall and connected to the last plenum
section (see Fig. 2). Additional plenum information can be found in the Field Installation of Plenum Sections,
1YEPMSC2516E007.
Fig. 2 Plenum Installation
Fig. 3 Plenum Exhaust Vent
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