The Institute for Standardization of Bosnia and Herzegovina, through its Technical Committee BAS/TC 8,Insulation soordination, high-voltage testing and instrument transformers, has translated the fourth edition of the BAS EN IEC 60060-1:2026, High-voltage test techniques – Part 1: General terminology and test requirements, which was previously adopted by the endorsement method of EN IEC 60060-1:2025.

BAS EN IEC 60060-1:2026, which is part of the IEC 60060 series, is applicable to:

-        dielectric tests with direct voltage;

-        dielectric tests with alternating voltage;

-        dielectric tests with impulse voltage;

-        dielectric tests with combinations of the above.

This document is applicable to tests on equipment having its highest voltage for equipment Um above 1.0 kV AC and 1.5 kV DC.

This fourth edition cancels and replaces the third edition published in 2010. It constitutes a technical revision and includes the following significant technical changes with respect to the previous edition:

-        The general layout and text have been updated and improved to make the standard easier to use, particularly the clauses for combined and composite test voltages.

-        The positive tolerance of the front time of lightning impulse voltage has been extended for Um > 800 kV to 100 % (= 2.4 µs).

-        For switching impulse voltage, a front time has been introduced, similar to lightning impulse voltage, and with the new front time the standard switching impulse is defined as 170/2 500 µs.

-        The requirements for precipitations have been adjusted depending on Um.

-        A new Annex C, “Procedure for manual calculation from graphical waveforms”, has been incorporated.

-        No examples of software have been given in Annex D, “Guidance for implementing software for evaluation of lightning impulse voltage parameters”.

-        The annex relating to the “Background to the introduction of the test voltage factor for evaluation of impulses with overshoot” has been deleted.

-        A new informative Annex F, “New definition of the front time of switching impulse voltage”, has been incorporated.

This document has the status of a horizontal publication in accordance with IEC Guide 108.

The original texts of the standard were prepared by IEC Technical Committee IEC/TC 42, High-voltage and hight current test techniques.