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Re: Light Fixtures -- Seismic

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     How is bracing of a drop ceiling generally done?  Of a light fixture 
     in a drop ceiling?
     
     John Hubert


______________________________ Reply Separator _________________________________
Subject: Light Fixtures -- Seismic
Author:  Tomchiu(--nospam--at)worldnet.att.net at Internet
Date:    11/19/97 10:15 


UBC standard 25-2 specifically addressed seismic bracing requirement of 
suspended ceiling and light fixtures( being connected to the ceiling 
system). 1994 UBC's Table 16-O item 2(6) defined "Anchorage of suspended 
ceiling and light fixtures" as one of the nonstructural components 
required to be seismically restrainted.  1997 UBC's Table 16-O further 
clarified that to be "Anchorage and LATERAL BRACING for suspended 
ceiling and light fixtures".
     
A General Contractor recently asked me for Code reference regarding 
seismic bracing requirement for independently hung light fixtures 
WITHOUT suspended ceiling.  The reason is that the electrical 
subcontractor insisted on there are no seismic bracing requirement for 
independently hung light fixtures.  I referred the GC to Table 16-O in 
both 1994 & 1997 UBC and insisted that seismic bracing is required for 
independently hung light fixtures as well since the splay wires of the 
suspended ceiling are not there to take the seismic.
     
What are your version of reasoning?
     
Thanks for the input.
     
Tom Chiu, SE
Walnut, CA