Draft Details

Review start date:May 22, 2019
Review end date:Jul 21, 2019
Contact email:mary.morgan(at)csagroup.org
Associated materials (click link to download). You will need to be logged in to download any files:

Adobe Acrobat For PDF files, Adobe Acrobat Reader can be downloaded from the Adobe website.

Draft Scope/Description:


This International Standard deals with all aspects of safety such as electrical, thermal and mechanical.

This part 2-13 of IEC 61558 applies to stationary or portable, single-phase or polyphase, aircooled (natural or forced), independent or associated auto-transformers, having a rated supply voltage not exceeding 1000 V a.c., a rated frequency not exceeding 500 Hz.

The core power does not exceed: - 1 kVA for single-phase auto-transformers; - 5 kVA for polyphase auto-
transformers. The rated output does not exceed: - 20 kVA for single-phase auto-transformers; - 100 kVA
for polyphase auto-transformers.

This standard is also applicable to auto-transformers having a core power up to 40 kVA, however such transformers are considered as special transformers and are subjected to an agreement between the purchaser and the supplier. Such special auto-transformers have no limitation for the rated output.

The no-load output voltage and the rated output voltage do not exceed 1 000 V a.c. or 1 415 V ripple-free d.c.

For independent auto-transformers, the no-load output voltage and the rated output voltage are not less
than 50 V a.c. or 120 V ripple free d.c.

This standard is applicable to transformers where no insulation between circuits is required by the installation rules or by the equipment specifications.

You may comment on any section of this document by clicking the “Submit Comment” link at the bottom of the relevant section.