Rockwell Automation 2100 CENTERLINE Low Voltage Motor Control Centers - Manual (Page 24)

24 Rockwell Automation Publication 2100-IN012E-EN-P - February 2012
Chapter 2 Installation Procedures
ArcShield Clearance Height
The area above the MCC top plate must be unrestricted to allow for proper
operation of the pressure relief venting system.
• A minimum clearance above the top of the MCC of 12 in. (305 mm) must
be available to allow for pressure relief and/or venting should an internal
arcing fault occur.
• 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).
Figure 10 - ArcShield Planning Dimensions
Securing an MCC Anchor bolts [1/2 in. (13 mm)] may be embedded in the foundation prior to
installation. Two bolts per vertical section fasten the MCC through its internal
mounting angle to the foundation [corner sections require three bolts and 40 in.
(1016 mm) wide sections require four bolts]. See the following illustrations and
tables for general dimensions. Dimensions matching your equipment can be
found on the elevation drawings shipped with your MCC.
IMPORTANT The lifting angle should not be removed from ArcShield sections with
100 ms arc resistant rating.
12 in. (305 mm)
ArcShield Sections with
100 ms Arc Rating Only