CEI EN 61558-2-14

BILINGUAL

This part of IEC 61558 deals with safety of variable
transformers for general applications and power
supply units incorporating variable
transformers for general applications.

Transformers incorporating electronic
circuits are also covered by this standard.

Transformers incorporating electronic circuits are also covered
by this standard.

NOTE 1 Safety includes electrical, thermal, mechanical and
chemical aspects.

Unless otherwise specified, from here onward, the term
transformer covers variable
transformers for general applications and power supply units
incorporating variable transformers for general
applications. The rated supply voltage does not exceed 1 000 V
a.c., and the rated supply frequency does not exceed 500 Hz.

This standard is applicable to transformers and power supply
units (linear) with internal operational frequencies not exceeding
500 Hz.

This standard used in combination with Part 2-16 for switch mode
power supply units (SMPS) is also applicable to power supplies with
internal operational frequencies higher than 500 Hz. Where the two
requirements are in conflict the most severe take precedence This
part does not apply to transformers covered by IEC 60076-11.

This part is applicable to stationary or portable, single-phase
or polyphase, air-cooled (natural or forced) independent or
associated dry-type transformers.

• variable auto-transformers and power
supply units incorporating variable autotransformers;

• variable separating
transformers and power supply units incorporating variable
separating transformers;

• variable isolating
transformers and power supply units incorporating variable
isolating transformers;

• variable safety isolating
transformers and power supply units incorporating variable
safety isolating transformers.

The windings may be encapsulated or non-encapsulated.