This International Standard specifies the test procedures, conditions and methods for determining the main performance parameters and operational characteristics of induction through-heating installations. This standard is applicable to the induction heating installations which through-heat the whole or part of metal billet or workpiece for its later hot forming (e.g. forging, extruding and rolling etc.), using low, mains or medium frequencies. It is possible to use it as a reference for other induction heating installations for heat-treatment and other purposes as well as superconducting d.c. induction through-heating installations.