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Since its initial publication in 1983, IEEE 515 has been the primary industrial trace heating standard in the United States and the basis for many other international industrial trace heating standards. With the overall objective of one worldwide standard for industry, the goals of the revised IEEE P515 were to incorporate technical updates and further harmonize with international industrial trace heating standards. The two industrial trace heating standards considered were International Electrotechnical Commission (IEC) 60079-30-1 and -2 ,  and Canadian Standards Association (CSA) 130-03 . This article presents the key changes in IEEE 515-2011 , the process used for harmonization, and the rationale for the additions and changes.