IEC 60398:2015 specifies the basic test procedures, conditions and methods for establishing the main performance parameters and the main operational characteristics of industrial installations and equipment intended for electroheating (EH) or electromagnetic processing of materials (EPM). This third edition cancels and replaces the second edition of IEC 60398 published in 1999 and the first edition of IEC TS 62796 published in 2013. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: - the title and scope of the standard have been expanded to include installations and equipment for electromagnetic processing of materials; - the requirements have been restructured; - tests concerning safety have been moved to IEC 60519-1; - new tests and clauses addressing energy efficiency considerations have been added; - a new annex placing this standard in the context of energy efficiency assessment as developed by ISO and IEC has been added; - new annexes addressing visual display of data, estimation of energy use and energy recoverability of fluids have been added.