Rockwell Automation 2100 CENTERLINE Low Voltage Motor Control Centers - Manual (Page 41)

Rockwell Automation Publication 2100-IN012E-EN-P - February 2012 41
Chapter
3
Installing Conduit and Cable
Installing Conduit When installing conduit, make sure it is installed according to local codes - to
assure water and moisture cannot enter or accumulate in the MCC enclosure.
Conduit must be installed so they are compatible with the NEMA rating of the
MCC. The conduit should be placed away from the horizontal ground bus to
avoid damage. We recommend that the conduit be positioned to minimize cable
bending and maintain relative vertical alignment to incoming connections.
Bottom Entry Conduit
Follow this procedure if your conduit is entering from the bottom.
1. Prepare the installation site so the foundation is level.
2. Before the MCC is installed, place and stub up conduit approximately 2 in.
(51 mm) above floor level, making sure all incoming conduit is clear of the
horizontal ground bus.
For approximate section base dimensions and ground bus locations, refer
to Installation Procedures,
Chapter 2 , or elevation and floor plan drawings
shipped with MCC.
For approximate bottom 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
2100-TD018 .
Top Entry Conduit
Follow this procedure if your conduit is entering from the top.
ATTENTION: For ArcShield units with 100 ms arc duration rating,
conduit, cable, and wiring must be installed in such a way so that it does
not interfere with the opening of the top plate vent (no cable or conduit in
the top-rear of cabinet; cable trays must be a minimum of 12 in. (305 mm)
above the top plate).