IEC 61558-1:2017/COR1:2025

Corrigendum 1 - Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests

Corrigendum 1 - Sécurité des transformateurs, bobines d'inductance, blocs d'alimentation et des combinaisons de ces éléments - Partie 1: Exigences générales et essais

General Information

• Status: Published
• Publication Date: 07-Dec-2025
• ICS: 29.180 - Transformers. Reactors
• Technical Committee: TC 96 - Transformers and reactors
• Current Stage: PPUB - Publication issued
• Start Date: 08-Dec-2025
• Completion Date: 23-Jan-2026

Relations

• Corrects: IEC 61558-1:2017 - Safety of transformers, reactors, power supply units and combinations thereof - Part 1: General requirements and tests
• Effective Date: 26-Oct-2025

Standards Content (Sample)

INTERNATIONAL ELECTROTECHNICAL COMMISSION
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
IEC 61558-1 IEC 61558-1
Edition 3.0  2017-09 Édition 3.0  2017-09

Safety of transformers, reactors, power supply Sécurité des transformateurs, bobines
units and combinations thereof - d’inductance, blocs d’alimentation et des
combinaisons de ces éléments -
Part 1: General requirements and tests
Partie 1: Exigences générales et essais

CO RRI G E NDUM 1
Corrections to the French version appear after the English text.
Les corrections à la version française sont données après le texte anglais.

19.12 Winding construction
Replace the existing fourth paragraph of 19.12.3 starting with "For spirally wrapped insulation."
with the following new text and new Figure 15:
For spirally wrapped insulation, the measured creepage distances and clearances between
layers, shall be those given in Clause 26.
If the measured creepage distances and clearances along the path between layers are higher
than those for P2 in accordance with Table 21 and Table 22 no additional test according to
26.2.4 – Test A, and 26.2.5.1 – Test B is required. The test voltages of the type tests in Clause
K.2 shall be applied with the conditions of K.2.5.
If the measured creepage distances and clearances are higher or equal than those for P1
and smaller than those for P2 in accordance with Table 21 and Table 22 the path between
layers shall be sealed against ingress of dust and moisture, as described in 26.2.5.1 – Test B.
The test voltages of the type tests in Clause K.2 shall be applied with the conditions of K.2.5.
If the measured creepage distances and clearances are less than those for P1 in accordance
with Table 21, the path between layers shall be sealed as for a cemented joint in 26.2.4. This
shall be tested in accordance with 26.2.4 – Test A with wires in usual delivery conditions. The
test voltages of the type tests in Clause K.2 shall be applied with the conditions of K.2.5.
The principle for insulated spirally wrapped winding wires for 1 000 V AC for reinforced
insulation is shown in Figure 15.
IEC 61558-1:2017-09/COR1:2025-12(en-fr)
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