CEI EN 61000-3-12

BILINGUAL

This part of IEC 61000 deals with the limitation of harmonic
currents injected into the public supply system. The limits given
in this International Standard are applicable to electrical and
electronic equipment with a rated input current exceeding 16 A and
up to and including 75 A per phase, intended to be connected to
public low-voltage a.c. distribution systems of the following
types:

– nominal voltage up to 240 V, single-phase, two or three
wires;

– nominal voltage up to 690 V, three-phase, three or four
wires;

– nominal frequency 50 Hz or 60 Hz.

Other distribution systems are excluded. The limits given in
this edition apply to equipment when connected to 230/400 V, 50 Hz
systems. See also Clause 5.

NOTE 1 The limits for the other systems will be added in a
future edition of this standard.

NOTE 2 Equipment with a rated input current exceeding 75 A per
phase should be considered in the harmonic current requirements for
installations. See IEC/TR 61000-3-6 and future IEC/TR
61000-3-14.

This standard applies to equipment intended to be connected to
low-voltage systems interfacing with the public supply at the
low-voltage level. It does not apply to equipment intended to be
connected only to private low-voltage systems interfacing with the
public supply only at the medium- or high-voltage level.

NOTE 3 The scope of this standard is limited to equipment
connected to public low voltage systems because emissions from
equipment installed in private low voltage systems can be
controlled in aggregate at the MV point of common coupling using
procedures defined in IEC/TR 61000-3-6 and/or by means of
contractual agreements between the distribution network operator
and the customer. It is expected that operators of private systems
will manage the EMC environment in a manner that ensures compliance
with the provisions given in IEC/TR 61000-3-6 and/or the
contractual agreements.

NOTE 4 If the equipment is intended to be connected only to
private systems, the manufacturer should make this very clear in
the product documentation.

NOTE 5 Professional equipment with input current <16 A
per phase and that does not comply with the requirements and limits
of standard IEC 61000-3-2 may be permitted to be connected to
certain types of low voltage supplies, in the same way as equipment
with input current < 16 A per phase and that does not
comply with the requirements and limits of the present standard
(see Annex C).

NOTE 6 The limits in this standard are not applicable to
stand-alone harmonic filters. This standard defines:

a) requirements and emission limits for equipment;

b) methods for type tests and simulations.

Tests according to this International Standard are type tests of
complete pieces of equipment.

Conformity with this standard can also be determined by
validated simulations.