The 2007 edition of NFPA 13R provides specific guidance for pendent sprinklers in residential occupancies such as an apartment. Section 6.8.1.5.3.2 states, "(A) Pendent sprinklers shall be located at least 3 ft from obstructions such as ceiling fans and light fixtures unless the requirements of 6.8.1.5.3.4 are met."
It appears the Standard is okay with any size light fixture provided the sprinkler is located at least 3' away center-to-center. If you use the option of meeting the requirements of Section 6.8.1.5.3.4, how do you account for someone changing the size of the light fixture in the future? What if there are blank covers over the ceiling electrical boxes for future light installations by the tenant?
It appears the Standard is okay with any size light fixture provided the sprinkler is located at least 3' away center-to-center. If you use the option of meeting the requirements of Section 6.8.1.5.3.4, how do you account for someone changing the size of the light fixture in the future? What if there are blank covers over the ceiling electrical boxes for future light installations by the tenant?