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Seismic Certification Criteria
81 Liebert
®
CW
™
System Design Manual
Appendix A: Optional Configuration
for Liebert CW Seismic Application
The International Code Council’s, International Building Code (IBC) has become the primary code
document for the design and installation of building systems.
Emerson Network Power has conducted analytical modeling and dynamic shake table testing of the
Liebert CW product to provide an option for those systems requiring seismic certification of compliance.
This certification goes beyond the equipments ability to withstand the seismic forces: the IBC system
approach includes the equipment, equipment anchorage and the connections to the equipment (power,
water supply and return and ducting0. In critical applications, the equipment must be capable of performing
its primary function after a seismic event within the limit of certification.
A.1 Seismic Certification Criteria
The Liebert CW certification is based on a maximum mapped spectral response acceleration, Ss, of 3.0g
adjusted by the soil site coefficient to Soil Site Class D as the default when the site soil properties or final
equipment installation location is not known. The certification maximum spectral response coefficient Sds
value of 2.0g including Soil Class and Seismic Use group corrections. Soil Classes A, B, C, D, E, and
Seismic Design Categories A, B, C, D, E, and F are all covered under this certification, limited by the Sds
value stated above. A seismic importance factor, Ip, of 1.5 applies to this certification to include essential
facility requirements and life safety applications for post-event functionality.
A seismic importance factor, Ip, of 1.5 applies to this certification to include essential facility requirements
and life-safety applications for the Liebert CW system’s functionality after a seismic event.
Shake-table testing conducted in accordance with ICC-ES AC-156 enveloped a required response
spectrum (RRS) defined by a maximum flexible region acceleration (AFLEX) of 3.2g and a zero period
acceleration (ARIG) of 2.4g.
A.1 Site Requirements
All floor and housekeeping pads must be approved by the structural engineer of record to resist the added
seismic loads from components being anchored as specified in
A.3 - Anchor and Load Requirements of
Seismic Installation . When anchoring the Liebert CW to a floor, re-bar interference must be considered.
The minimum housekeeping pad thickness must be the thickness required by the qualification report for
the selected post-installed anchor or 1.5 times the depth the anchor is embedded, whichever is greater.
Table A-1 Comparison of certification criteria, 2000-2006
IBC 2009 IBC 2006 IBC 2003 IBC 2000
S
ds
<=2.0 S
ds
<=2.0 S
ds
<=2.0 S
ds
<=2.0
I
p
<=1.5
I
p
<=1.5
I
p
<=1.5
I
p
<=1.5
ap/R
p
<=0.5 ap/R
p
<=1.25 ap/R
p
<=1.0 ap/R
p
<=1.0
z/h <=1.0 z/h <=1.0 z/h <=1.0 z/h <=1.0
NOTE
Structural engineer of record is defined as: The registered design professional responsible for the
design of the designated seismic systems on the building construction documents.