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Seismic Applications for Lighting Fixtures

Discussion in 'Residential Seismic' started by John Buchmann, Mar 15, 2020.

  1. John Buchmann

    John Buchmann Registered User

    Mar 15, 2020
    Likes Received:

    I have searched about seismic applications for lighting fixtures and I found the text below. Can I use this table for conventional ceilings or do these requirements apply only to suspended acoustical ceilings? Should I use four seismic cables for each luminaire (even for circular luminaires weighing 0.8 kg)?

  2. Mark K

    Mark K Platinum Member

    May 12, 2010
    Likes Received:
    I cannot see the table. You did not indicate the source of the table.

    The IRC does not contemplate suspended ceilings thus you should look to the IBC.

    While suspended acoustical ceilings are generally more of a problem all suspended ceilings should be braced.

    Besides preventing lighting fixtures from falling the concern with suspended light fixtures is that they will sway enough to bang against something else, including other light fixtures, thus causing something to fall. If the swaying light fixture cannot hit up against something else then the need for sway bracing may not be needed. There does not appear to be a hard rule but if each suspended item can sway 45 degrees from the vertical and not hit anything I do not see a problem.
    Msradell and John Buchmann like this.
  3. mtlogcabin

    mtlogcabin Registered User

    Oct 17, 2009
    Likes Received:
    ASCE 7 also addresses this topic

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