General Information

Abstract

Status: Published
Publication Date: 02-Sep-2014

ICS: 29.160.01 - Rotating machinery in general

Technical Committee: TC 2 - Rotating machinery

Current Stage: DELPUB - Deleted Publication
Start Date: 16-Jan-2026
Completion Date: 28-Aug-2026

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IEC 60034-26:2006/COR1:2014 - Corrigendum 1 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors
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IEC 60034-26:2006/COR1:2014 - Corrigendum 1 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors Released:9/3/2014

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Corrects: IEC 60034-26:2006 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors
Effective Date: 05-Sep-2023

Corrects: IEC TS 60034-26:2002 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase induction motors
Effective Date: 05-Sep-2023

Revised: IEC 60034-26:2026 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors
Effective Date: 21-Jun-2024

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IEC 60034-26:2006/COR1:2014 - Corrigendum 1 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors Released:9/3/2014

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Frequently Asked Questions

What is IEC 60034-26:2006/COR1:2014?

IEC 60034-26:2006/COR1:2014 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Corrigendum 1 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors". This standard covers: Corrigendum 1 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors

What is the scope of IEC 60034-26:2006/COR1:2014?

Corrigendum 1 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors

What ICS categories does IEC 60034-26:2006/COR1:2014 belong to?

IEC 60034-26:2006/COR1:2014 is classified under the following ICS (International Classification for Standards) categories: 29.160.01 - Rotating machinery in general. The ICS classification helps identify the subject area and facilitates finding related standards.

What standards are related to IEC 60034-26:2006/COR1:2014?

IEC 60034-26:2006/COR1:2014 has the following relationships with other standards: It is inter standard links to IEC 60034-26:2006, IEC TS 60034-26:2002, IEC 60034-26:2026. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

How can I access IEC 60034-26:2006/COR1:2014?

IEC 60034-26:2006/COR1:2014 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)

IEC 60034-26:2006/COR1:2014 - ...

IEC 60034-26 IEC 60034-26
(First edition – 2006) (Première édition – 2006)

Rotating electrical machines – Machines électriques tournantes –

Part 26: Effects of unbalanced voltages on the Partie 26: Effets d'un système de tensions
performance of three-phase cage induction déséquilibrées sur les caractéristiques de
motors fonctionnement des moteurs à cage asynchrones
triphasés
CO RRI G E NDUM 1
In Annex B, replace the mathematical Dans l’Annexe B, remplacer la formule
formula and the subsequent two mathématique et les deux explications de
explanations of the symbols by the following symboles qui suivent par la nou
...

IEC

IEC 60034-8:2026/COR1:2026(Corrigendum)

Corrigendum 1 - Rotating electrical machines - Part 8: Terminal markings and direction of rotation

Standard
4 pages
English and French language
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28-Jul-2026
29.160.01
TC 2

IEC

IEC 60034-8:2026(Main)

Rotating electrical machines - Part 8: Terminal markings and direction of rotation

CORRECTED VERSION 2026-07
IEC 60034-8:2026 applies to AC and DC machines and specifies:
a) rules for the identification of winding connection points;
b) marking of winding terminals;
c) direction of rotation;
d) relationship between terminal markings and direction of rotation;
e) terminal marking of auxiliary devices;
f) connection diagrams of machines for common applications.
This fourth edition cancels and replaces the third edition published in 2007 and Amendment 1:2014. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) The inclusion of turbine-type synchronous machines in the scope.
The content of the corrigendum 1 (2026-07) has been included in this copy.

Standard
34 pages
English language
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Standard
69 pages
English language
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Standard
34 pages
French language
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Standard
68 pages
English and French language
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Standard
68 pages
English and French language
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01-Jun-2026
29.160.01
TC 2

IEC

IEC TS 60034-27-6:2026(Main)

Rotating electrical machines - Part 27-6: On-line partial discharge measurements of rotating machine windings supplied from a converter

IEC TS 60034-27-6:2026 which is a Technical Specification, deals with the on-line electrical detection and monitoring of partial discharges on both motors and generators whose rotor windings or stator windings, or both, are supplied from converters. The tests are applicable to both type I and type II insulation systems, encompassing AC windings rated 300 V and above.
Details of non-electrical methods such as optical or acoustic detection are not included. The on-line measurement of PD where the winding is supplied via slip rings are also not covered.

Technical specification
21 pages
English language
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19-May-2026
29.160.01
TC 2

IEC

IEC 60034-1:2026(Main)

Rotating electrical machines - Part 1: Rating and performance

IEC 60034-1:2026 is available as IEC 60034-1:2026 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60034-1:2026 is applicable to all rotating electric machines, except rotating electric machines for rail and road vehicles, which are covered by the IEC 60349 series of standards. Machines with integrated EMC-active components such as a variable frequency converter are considered being a power drive system (see the IEC 61800 series of standards). In such cases, this document applies to the motor component of the power drive system only. Machines within the scope of this document can also be subject to superseding, modifying or additional requirements in other standards, for example, IEC 60079 and IEC 60092.
NOTE If particular clauses of this document are modified to meet special applications, for example machines subject to radioactivity or machines for aerospace, all other clauses apply insofar as they are compatible. This fifteenth edition cancels and replaces the fourteenth edition published in 2022. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
Clause 1: Clarification with respect to machines with integrated EMC-active components added
Clause 2: Normative references updated
Clause 3: Note on meaning of “agreement” deleted; list of abbreviations added
Clause 4.2.9, 4.2.10: References to IEC TS 60034-25 deleted, as converter duty is now defined in 3.36
Clause 5.1: Reference to IEC TS 60034-25 converted into note
Clause 6.6 Clarification of requirements
Clause 7.2.1: Reference to IEC TS 60034-25 converted into note
Clause 7.5: Clarification of requirements
Clause 7.6: Reference to IEC TS 60034-25 converted into note
Clause 8.1: Clarification of references
Clause 8.6.1: Clarification on choice of method for large machines
Table 11: Updated values for thermal class 200 (N)
Clause 8.10.3: Clarification of requirements
Clause 9.2: Clarification on test voltage for old machines after rewinding
Table 17: Items 9 and 10 merged and clarified
Clause 9.7: Clarification on overspeed test for machines held at stock added
Table 20: Clarification on test speed for converter duty machines
Clause 10.2: Clarification of term ‘digital form’
Clause :10.3 Note on QR code deleted
Clause 11.1: Reference to protective earth test added
Clause 13.1: Clarifying flowchart added
Clause 13.2.2: Clarification on motors with integrated VSD added
Clause 13.3: Clarification of requirements after consultation with ACEC
Clause 13.5: Clarification of requirements after consultation with ACEC
Clause 14: Note on safety converted to normal text

Standard
259 pages
English language
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Standard
174 pages
English and French language
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Standard
174 pages
English and French language
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12-Mar-2026
29.160.01
TC 2

IEC

IEC 60072-3:2026(Main)

Rotating electrical machines - Dimensions and output series - Part 3: Small built-in motors - Flange numbers BF10 to BF50

IEC 60072-3: 2026 applies to small built-in motors with a pitch circle diameter of the flange between 10 mm and 50 mm. It provides a table with fixing dimensions, shaft extension dimensions and their tolerances.
This second edition cancels and replaces the firstedition published in 1994. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) clarification of the scope.

Standard
6 pages
English language
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Standard
6 pages
French language
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Standard
12 pages
English and French language
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05-Feb-2026
29.160.01
TC 2

IEC

IEC 60034-26:2026(Main)

Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors

IEC 60034-26:2026 is available as IEC 60034-26:2026 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60034-26:2026 describes the effects of unbalanced voltages on the performance of three-phase cage induction motors. This second edition cancels and replaces the first edition published in 2006. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) clarification that voltages are line-to-line voltages in Clause 4, Annex A and Annex B;
b) addition of design NE according to IEC 60034-12 in Clause 4.

Standard
10 pages
English language
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Standard
44 pages
English language
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Standard
11 pages
French language
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Standard
21 pages
English and French language
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15-Jan-2026
29.160.01
TC 2

IEC

IEC 60034-30-1:2025(Main)

Rotating electrical machines - Part 30-1: Efficiency classes of line operated AC motors (IE code)

IEC 60034-30-1:2025 specifies efficiency classes for single-speed electric motors that are rated in accordance with IEC 60034‑1 or IEC 60079‑0 and are rated for operation on a sinusoidal either 50 Hz or 60 Hz, or both voltage supply.
The motors within this document:
- have a rated power PN from 0,12 kW to 1 000 kW;
- have a rated voltage UN from 50 V up to and including 1 000 V;
- have 2, 4, 6 or 8 poles;
- are capable of continuous operation at their rated power with a temperature rise within the specified insulation temperature class;
NOTE 1 Most motors covered by this document are rated for duty type S1 (continuous duty). However, some motors that are rated for other duty cycles are still capable of continuous operation at their rated power, and these motors are also covered by this document.
- are marked with any ambient temperature within the range of –30 °C to +60 °C;
NOTE 2 The rated efficiency and efficiency classes are based on 25 °C ambient temperature in accordance with IEC 60034‑2‑1.
NOTE 3 Motors exclusively rated for temperatures outside the range – 30 °C and +60 °C are considered to be of special construction and are consequently excluded from this document.
NOTE 4 Smoke extraction motors with a temperature class of up to and including 400 °C are covered by this document.
- are marked with an altitude up to 4 000 m above sea level.
NOTE 5 The rated efficiency and efficiency class are based on a rating for altitudes up to 1 000 m above sea level.
This document establishes a set of nominal efficiency values based on supply frequency, number of poles and motor output power. No distinction is made between motor technologies, supply voltage or motors with increased insulation designed specifically for converter operation even though not all motor technologies are capable of reaching the higher efficiency classes (see Table 1). This makes different motor technologies fully comparable with respect to their energy efficiency potential.
The efficiency of power-drive systems is not covered by this document. Motor losses due to harmonic content of the supply voltage, losses in cables, filters and frequency-converters, are not covered.
Motors with flanges, feet or shafts with mechanical dimensions different from IEC 60072‑1 are covered by this document.
Geared motors are covered by this document including those incorporating non-standard shafts and flanges.
This document does not apply to the following:
- Single-speed motors with 10 or more poles or multi-speed motors.
- Motors with mechanical commutators (such as DC motors).
- Motors completely integrated into a machine (for example pump, fan and compressor) that cannot be practically tested separately from the machine even with provision of a temporary end-shield and drive-end bearing. This means the motor: a) shares common components (apart from connectors such as bolts) with the driven unit (for example, a shaft or housing) and b) is not designed in such a way as to enable the motor to be separated from the driven unit as an entire motor that can operate independently of the driven unit. That is, for a motor to be excluded from this document, the process of separation shall render the motor inoperative.
- Totally enclosed air-over machines (TEAO, IC418), i.e. totally enclosed frame-surface cooled machines intended for exterior cooling by a ventilating means external to the machine. Efficiency testing of such motors can be performed with the fan removed and the cooling provided by an external blower with a similar airflow rate as the original fan.
- Motors with integrated frequency converters (compact drives) when the motor cannot be tested separately from the converter. Energy efficiency classification of compact drives is based on the complete product (PDS, ie. Power Drive System) and is defined in IEC 61800‑9‑2.
NOTE 6 A motor is not excluded when the motor and frequency-converter can be separated, and the motor can be tested independently of th

Standard
27 pages
English language
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Standard
83 pages
English language
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Standard
27 pages
French language
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Standard
54 pages
English and French language
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30-Nov-2025
29.160.01
TC 2

IEC

IEC 60072-2:2025(Main)

Dimensions and output series for rotating electrical machines - Part 2: Frame numbers 355 to 1 000 and flange numbers 1 180 to 2 360

IEC 60072-2: 2025 covers the majority of rotating electrical machines for industrial purposes within the dimension range and output powers:
- Foot-mounted: shaft heights: 355 mm to 1 000 mm.
- Flange-mounted: pitch circle diameter of flange: 1 180 mm to 2 360 mm.
It gives tables of fixing dimensions, shaft extension dimensions and their tolerances. However, the variety of construction and the wide range of applications for the large machines with shaft heights above 315 mm have led to the establishment of a relatively large number of values for the dimension in order to cover all possible constructions. Owing to this, the present part covers a wider range than IEC 60072-1 within which range values suitable for all designs or for a more detailed standardization can be chosen. NOTE The mounting dimensions given in this document for shaft heights 355 mm and 400 mm have been chosen from values given in IEC 60072-1.
This second edition cancels and replaces the first edition published in 1990. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
a) complete revision on the basis of IEC 60072-1;
b) additional tolerances and measurements for shafts and flanges (DIN SPEC 42955).

Standard
14 pages
English language
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Standard
14 pages
French language
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Standard
28 pages
English and French language
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04-Sep-2025
29.160.01
TC 2

IEC

IEC 60034-15:2025(Main)

Rotating electrical machines - Part 15: Impulse voltage withstand levels of form-wound stator coils for rotating a.c. machines

IEC 60034-15: 2025 relates to AC machines incorporating form-wound stator coils that are intended to be connected to a standard grid supply. It specifies the test procedures and voltages to be applied to sample coils, as well as routine tests performed on coils mounted in the stator core. The purpose of this document is to show the ability of a stator winding to resist voltage transients originating from the grid the machine is connected to. Annex A gives further information. The stator windings and coils for converter-fed machines are excluded from the scope of this document. This document is not intended for use on complete windings since it is difficult to determine when the turn insulation has failed due to the test.
This fourth edition cancels and replaces the third edition published in 2009. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- harmonize the standard test levels with IEEE Std 522TM [2];
- introduce an enhanced surge impulse voltage withstand level;
- introduce the option to test up to the point of electrical breakdown;
- improve the evaluation of the recorded impulses in case of oscillations and overshoot;
- indicate that converter fed machines are excluded from the scope;
- provide guidance on the execution of impulse tests.

Standard
88 pages
English and French language
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05-Jun-2025
29.160.01
TC 2

IEC

IEC 60034-12:2024(Main)

Rotating electrical machines - Part 12: Starting performance of single-speed three-phase cage induction motors

IEC 60034-12:2024 specifies the parameters for eight designs of starting performance of single-speed three-phase 50 Hz or 60 Hz cage induction motors in accordance with IEC 60034‑1 that:
- have a rated voltage up to 1 000 V;
- are intended for direct-on-line or star-delta starting;
- are rated on the basis of duty type S1;
- are constructed to any degree of protection as defined in IEC 60034-5 and explosion protection.
This document also applies to dual voltage motors provided that the flux saturation level is the same for both voltages. This fourth edition cancels and replaces the third edition published in 2016. Aligned with the requirements for explosion protected motors from TC31 WG27
- new clause on methods for measuring locked-rotor current and torque;
- new informative annex on the general current and torque characteristics with locked rotor;
- new informative annex on correction of voltage and frequency;
- aligned with the requirements for explosion protected motors from TC31 WG27.

Standard
75 pages
English language
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Standard
50 pages
English and French language
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21-May-2024
29.160.01
TC 2

General Information

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IEC 60034-26:2006/COR1:2014 - Corrigendum 1 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors Released:9/3/2014

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IEC 60034-26:2006/COR1:2014 - Corrigendum 1 - Rotating electrical machines - Part 26: Effects of unbalanced voltages on the performance of three-phase cage induction motors Released:9/3/2014

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