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Rockwell Automation Publication 2100-IN012D-EN-P - September 2010
Chapter 2
Installation Procedures
Seismic Requirements
To demonstrate the seismic withstand of various CENTERLINE MCCs [20 in.
deep (508 mm), 30 in. deep (762 mm) back-to-back, and 40 in. deep (1016 mm)
back-to-back], the MCC design construction has been qualified by seismic
calculations per the Uniform Building Code (UBC). CENTERLINE 2100
MCC samples have been seismically qualified by dynamic (triaxial multi-
frequency testing) seismic tests per IEEE 344 Seismic Test Standards. The results
of the MCC seismic testing demonstrated compliance with the 100% g level of
Uniform Building Code 1997 (UBC) zone 4 (the maximum UBC zone) and
100% g level of The International Building Code 2006 (IBC), for example, the
MCC structure, the MCC units, and the MCC components or electrical
functions were not compromised when subjected to a UBC Zone 4 earthquake,
or the IBC seismic event. Per the IEEE 344 standard, the equipment was under
power and operated before, during, and after the seismic tests.
In order to obtain a UBC or IBC seismic withstandability, each individual
CENTERLINE 2100 MCC lineup (for example, both front and back MCCs in
‘back-to-back applications), must be mounted on an adequate seismic foundation
and installed per the seismic anchoring requirements as shown in the following
illustrations.
In seismic application dimensions ‘E’ applies to the first and last sections of the
MCC lineup. See Figure 11 -
Mounting Dimensions for 15 in. and 20 in. Sections
for dimensions.
Figure 21 - Seismic Bolt Down Requirements
IMPORTANT
Variable frequency drive units using ‘rollout’ drive configurations are not
seismically tested.
E
E
Rear
Front
First Section
Last Section
Second Section and
Additional Sections
MCC Lineup
1
The hardware required is 1/2 in.-13 Grade 5 or HSL-3 M12 or better bolts embedded in the foundation.
1
1
1
