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What is the difference between a 13D system and a 13R system?

Question asked by hfdfpb on Mar 5, 2018
Latest reply on Mar 5, 2018 by cdafd

I an the local AHJ and within my jurisdiction there is a group of 16 unit two story apartment buildings that have 13D systems. We currently use the 2015 LDC which requires a 13R system. The buildings only have smoke detectors in individual units and no detection, notification or alarm system. Can the 13D system be changed to become and 13R system? If so what must be done. Thanks for your assistance, Will