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Rockwell Automation Publication 2100-IN012D-EN-P - September 2010
Chapter 3
Installing Conduit and Cable
1.
After the MCC is in place, leveled, and the sections are joined and spliced,
bring conduit into the top of the incoming section.
For approximate top entry locations and wiring schemes for main fusible
disconnects, main circuit breakers and incoming line compartments, refer
to Mains and Incoming Lines Dimension Reference,
publication
2.
Remove the lifting angle and top plate.
3.
Modify the top plate for necessary conduit entries.
This method helps guard against metal chips falling into the MCC, which
can cause serious damage to the components.
4.
Replace the top plate and lifting angle bolts to guard against dust or dirt
from entering the top horizontal wireway.
5.
Make sure that all incoming conduit is clear of the horizontal ground bus.
For approximate location of the horizontal ground bus mounted in the top
horizontal wireway, refer to Mains and Incoming Lines Dimension
Reference, publication
.
For space availability for incoming cables, refer to the elevation drawings
shipped with assembled MCCs.
Installing Cable
Install the cable when the temperature is above freezing 0 °C (32 °F), unless the
cable is suitable for installation at temperatures below freezing. This will help
prevent cable insulation from cracking or splitting.
MCCs are rated for use with 75 °C (167 °F) cable. Cable must be sized by using a
75 °C (167 °F) column in NEC Table 310–16 (NEC 2005 Edition). The
temperature rating of the lugs is not relevant.
Lugs
Follow this procedure to install the lugs.
1.
Verify the compatibility of wire size, type, and stranding versus the power
lugs furnished.
Use correct lugs in all applications.
2.
Crimp compression lugs with manufacturer recommended tools.
3.
Use the MCC electrical schematics to verify field wiring connection
points.
ATTENTION:
Properly connect all line and load cables to avoid a bolted
fault and equipment damage.
