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The 2015 edition of NFPA 731 provides up-to-date references and incorporates provisions from the latest editions of applicable UL, SIA, and NFPA codes and standards including the 2014 NEC: National Electrical Code®. Other changes include:

• Clarified rules in the sections pertaining to power supplies
• Clarified requirements fo rlow-power radio (wireless) systems for improved usability