CEI EN 61558-2-15

BILINGUAL

This part of IEC 61558 deals with safety aspects of
isolating transformers for the supply of medical
locations.

NOTE 1 Safety includes electrical, thermal and mechanical
aspects.

Unless otherwise specified, from here onward, the term
transformer covers isolating transformers
for the supply of medical locations.

This part is applicable to stationary,
single-phase or three-phase, air-cooled (natural or forced)
independent dry-type isolating transformers for
the supply of medical IT systems for group 2 medical locations,
designed to be permanently connected to the fixed wiring and
intended to form the IT power system on the secondary side. The
windings may be encapsulated or non-encapsulated.

NOTE 2 IT power systems are defined in IEC 60364-1.

NOTE 3 The installation rules for medical IT systems for group 2
medical locations are covered by IEC 60364-7-710.

NOTE 4 Transformers covered by this standard
are intended for the supply of medical locations. All other
transformers or equipments connected downstream from the
transformer are not covered by this Part 2.

The rated supply voltage does not exceed 1 000
V a.c. The rated supply frequency and internal operational
frequency do not exceed 500 Hz.

The rated output does not be less than 0,5 kVA
and does not exceed 10 kVA for singlephase and three-phase
transformers.

This part is applicable to transformers without
limitation of the rated output subject to an
agreement between the purchaser and the manufacturer.

NOTE 5 Transformers intended to supply power to distribution
networks are not covered by this standard.

The no-load output voltage and the
rated output voltage does not exceed 250 V a.c.
for single-phase or three-phase transformer
(phase-to-phase voltage).

This standard do not cover power supply
unit.

This part is not applicable to external circuits and their
components intended to be connected to the input terminals and
output terminals of the transformers.
Transformers covered by this part are used in
applications where double or reinforced insulation
between circuits is required by the installation rules or by the
appliance specification.

NOTE 6 Attention is drawn to the following:

– for transformers intended to be used in
vehicles, on board ships, and aircraft, additional requirements
(from other applicable standards, national rules, etc.) may be
necessary;

– measures to protect the enclosure and
the components inside the enclosure against external influences
such as fungus, vermin, termites, solar-radiation, and icing should
also be considered;

– the different conditions for transportation, storage, and
operation of the transformers should also be
considered;

– additional requirements in accordance with other
appropriate standards and national rules may be applicable to
transformers intended for use in special
environments.