This part of IEC 61 204 specifies electromagnetic compatibility (EMC) requirements for power supply units (PSUs) providing d.c. output(s) with or without auxiliary a.c. output(s), operating from a.c. or d.c. source voltages up to 600 V a.c. or 1 000 V d.c. (see exceptions under 1 .1 .3.)
NOTE Ringing generators used in telecoms applications are covered by this standard.
