EN 60519-2:1993

These particular requirements apply to equipment for indirect resistance heating of a charge, such equipment being energized with d.c. volage or with single-phase or poly-phase a.c. voltage of frequency up to 60 Hz. These particular requirements also apply to equipment for direct resistance heating by means of electrodes, by which a charge or a heat transfer fluid is heated. The stated requirements do not apply to equipment for direct resistance heating, where, owing to the technology involved, IEC 519-3, IEC 519-4 and IEC 3519-8 apply. Moreover, they do not apply to electrode-steam boiler instantaneous water heaters and electrode pressure vessels.