scope:

Equipment covered by this standard

This part of IEC 61204 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.

This product standard covers both stand alone and component power supply units as defined in this standard. It covers PSU units for use in or with IT equipment normally covered by IEC 60950-1:2001¹ and/or IEC 60950-1:2005; PSU units for use in or with measurement, control and laboratory equipment normally covered by IEC 61010-1; PSU units for use in or with medical equipment - normally covered by IEC 60601-1; PSU units for use in or with audio, video and similar electronic apparatus - normally covered by IEC 60065. It also covers d.c. power and distribution equipment and d.c./d.c. converters.

Where no standard exist, use of this standard for other applications is not precluded.

Additional requirements

Requirements additional to those specified in this standard may be necessary for

- PSUs intended for operation in special environments (for example, extremes of temperature; excessive dust, moisture or vibration; flammable gases; and corrosive or explosive atmospheres);

- PSUs intended to be used in vehicles, on board ships or aircraft, or in tropical countries;

- PSUs intended for use where ingress of water is possible.

NOTE Attention is drawn to the fact that authorities in some countries impose additional requirements for health, environmental and similar reasons.

Exclusions

This standard does not apply to

- motor-generator sets;

- uninterruptible power supplies (UPS) to IEC 62040-1-1;

- PSUs covered by IEC 61558-1 (i.e. power supply units incorporating safety isolating transformers providing SELV or PELV output(s) in accordance with IEC 60364-4-41 and PSUs for use with household and other consumer products, except those covered by IEC 60065 and IEC 60950-1:2001 and/or IEC 60950-1:2005;

- transformers covered by IEC 61558-1;

- step-down converters covered by IEC 60146-1-1;

- PSUs and converters for use with or in products covered by IEC 61347-2-2.

Types of power supply

Two types of power supplies are covered by this standard:

a) stand alone (or end-product) power supplies

Power supplies intended for free-standing operation (individual apparatus).

This part of IEC 61204 is applicable to PSUs developed as a unit with a direct function and sold on the market as a stand-alone unit.

b) component power supplies

These can be divided into two categories:

1) component power supplies considered as equivalent to stand alone power supplies (apparatus).

This part of IEC 61204 is applicable to this category of component PSUs. These PSUs are considered to be apparatus with respect to their EMC requirements, for example those PSUs intended for use in installations or sold to the general public, cases where no further EMC tests are anticipated. This does not include PSUs sold as spares for repair which have been tested as part of an overall equipment.

2) component power supplies intended for a professional installer

This part of IEC 61204 is applicable to this category of power supplies only as an aid to specify relevant EMC requirements in order that various end-product standards may be met.

These are component power supplies that are intended for incorporation into a final product by a professional installer. These products may be sold to a professional installer or placed on the market for specialized distribution and use. In neither case do they perform in themselves a direct function for the user of an end-product. Further EMC tests of the assembly are assumed.

NOTE After incorporation into a final product, the emission values can be altered (e.g. because of modified earth connections).

¹ This publication has been withdrawn and replaced by the second edition issued in 2005.