This part of IEC 60071 applies to three-phase AC systems having a highest voltage for
equipment above 1 kV. It specifies the procedure for the selection of the rated withstand
voltages for the phase-to-earth, phase-to-phase and longitudinal insulation of the equipment
and the installations of these systems. It also gives the lists of the standard withstand
voltages from which the rated withstand voltages are selected.
This document describes that the selected withstand voltages are associated with the highest
voltage for equipment. This association is for insulation co-ordination purposes only. The
requirements for human safety are not covered by this document.
Although the principles of this document also apply to transmission line insulation, the values
of their withstand voltages can be different from the standard rated withstand voltages.
The apparatus committees are responsible for specifying the rated withstand voltages and the
test procedures suitable for the relevant equipment taking into consideration the
recommendations of this document.
NOTE In IEC 60071-2, all rules for insulation co-ordination given in this document are justified in detail, in
particular the association of the standard rated withstand voltages with the highest voltage for equipment. When
more than one set of standard rated withstand voltages is associated with the same highest voltage for equipment,
guidance is provided for the selection of the most suitable set.
This horizontal standard is primarily intended for use by technical committees in the
preparation of standards in accordance with the principles laid down in IEC Guide 108.
One of the responsibilities of a technical committee is, wherever applicable, to make use of
horizontal standards in the preparation of its publications. The contents of this horizontal
standard will not apply unless specifically referred to or included in the relevant publications.

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This part of IEC 60401 provides a nomenclature of the most frequent surface, bulk and shape
irregularities relevant to cores made of soft ferrites (magnetic oxides). Most irregularities are
graphically exemplified as visual aids. A general recommendation is also given in Annex A for
a consistent scheme for specifying the exact location of the irregularity, combining a general
name for the location with more detailed qualifiers of the specified location. This document
can also be useful as a terminology reference when preparing technical documentation,
irregularity inspection specifications, etc.
This document also presents a method for defining the designation nomenclature for the
major physical attributes of soft ferrite core shapes. The purpose of this document is to
facilitate uniform usage of dimensional characters by manufacturers, specifiers, and users
when describing core dimensions on drawings, in tables, and on catalogue specification
sheets.

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TAN - // IEC Corrigendum

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IEC 62899-503-1:2020(E) specifies a test method for displacement current measurement (DCM) for printed thin film transistors (TFTs) or organic thin film transistors (OTFTs).

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IEC 60050-447:2020 gives the general terminology used in measuring relays and protection equipment, as well as general terms pertaining to specific applications and associated technologies. This new edition reviews and complements the previous one. It has the status of a horizontal standard in accordance with IEC Guide 108:2006. This terminology is consistent with the terminology developed in the other specialized parts of the IEV.

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IEC 60050-426:2020 gives terms specifically relevant to explosive atmospheres. This new edition reviews and complements the previous one. This terminology is consistent with the terminology developed in the other specialized parts of the IEV.
It has the status of a horizontal standard in accordance with IEC Guide 108.

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IEC 60050-485:2020 gives the general terminology used in fuel cell technologies, as well as general terms pertaining to specific applications and associated technologies. This terminology is consistent with the terminology developed in the other specialized parts of the IEV.
It has the status of a horizontal standard in accordance with IEC Guide 108.

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This document applies to carbon brushes for electrical machinery. For the present, it applies only to carbon brushes for commutators and slip-rings in rotating machines. Terms and definitions are relative to the brush construction (references 100’s to 500’s and parts of 900’s) and to the markings when operating on a rotating machine (references 600’s to 800’s). By extension, terms and definitions may be relevant for any kind of sliding electrical contacts for electrical machinery.

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This Standard defines terms for high-voltage direct current (HVDC) power transmission systems and for HVDC substations using electronic power converters for the conversion from AC to DC or vice versa. This document is applicable to HVDC substations with line commutated converters, most commonly based on three-phase bridge (double way) connections (see Figure 2) in which unidirectional electronic valves, for example semiconductor valves, are used. For the thyristor valves, only the most important definitions are included in this document. A more comprehensive list of HVDC valve terminology is given in IEC 60700-2.

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IEC 60276:2018 applies to carbon brushes for electrical machinery. This edition applies only to carbon brushes for commutators and slip-rings in rotating machines. Terms and definitions are relative to the brush construction (references 100’s to 500’s and parts of 900’s) and to the markings when operating on a rotating machine (references 600’s to 800’s). This new edition includes the following significant technical changes with respect to the previous edition:  Some nomenclature has been deleted or added, whereas remaining definitions have been detailed and clarified, to reflect the technical evolution since 1987. Additional definitions have been included to address the request for reviewing this standard, in particular nomenclature of commutator/slip-rings markings, brush markings and commutation sparks codes.

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This part of IEC 60050 defines terms specifically relevant to live working. It has the status of a
horizontal standard in accordance with IEC Guide 108, Guidelines for ensuring the coherency
of IEC publications – Application of horizontal standards.
The aim of this IEV part is to provide precise, brief and correct definitions of internationally
accepted concepts in the field of live working, and to name the terms by which these defined
concepts shall be known.
NOTE Complementary terms and definitions of tools, devices and equipment for live working are provided in
IEC 60743, Live working - Terminology for tools, devices and equipment.
This terminology is consistent with the terminology developed in the other specialized parts of
the IEV.
This horizontal standard is primarily intended for use by technical committees in the
preparation of standards in accordance with the principles laid down in IEC Guide 108.
One of the responsibilities of a technical committee is, wherever applicable, to make use of
horizontal standards in the preparation of its publications. The content of this horizontal
standard will not apply unless specifically referred to or included in the relevant publications.

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This International Standard defines terms for the subject of self-commutated voltage-sourced converters used for transmission of power by high voltage direct current (HVDC). The standard is written mainly for the case of application of insulated gate bipolar transistors (IGBTs) in voltage sourced converters (VSC) but may also be used for guidance in the event that other types of semiconductor devices which can both be turned on and turned off by control action are used. Line-commutated and current-sourced converters for high-voltage direct current (HVDC) power transmission systems are specifically excluded from this standard.

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IEC 62129-3:2019 describes the calibration of optical frequency meters using an optical frequency comb as an internal reference. It is applicable to instruments measuring the optical frequency emitted from sources that are typical for the fibre-optic communications industry. It is assumed that the optical radiation will be coupled to the optical frequency meter by a single-mode optical fibre. This document is part of the IEC 62129 series on the calibration of wavelength/optical frequency measurement instruments. Refer to IEC 62129­1 [3] for the calibration of optical spectrum analyzers, and refer to IEC 62129-2 [4] for calibration of Michelson interferometer single wavelength meters. This first edition cancels and replaces IEC TS 62129-3, published in 2014. This edition includes the following significant technical changes with respect to the previous edition:
a) text has been added to 5.2.3 about calibration at a second optical frequency;
b) Annex D is now normative;
c) Subclause 4.2 has been improved;
d) measurement method of frequency has been moved to Annex B;
e) example of optical frequency comb has been moved to Annex C;
f) frequency-dependence uncertainty has been moved to Annex D.
Keywords: calibration of optical frequency meters

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IEC 60050-523:2018 gives the general terminology used for micro-electromechanical devices including the process of production of such devices. This terminology is consistent with the terminology developed in the other specialized parts of the IEV.
It has the status of a horizontal standard in accordance with IEC Guide 108.

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IEC 61191-1:2018 is also available as IEC 61191-1:2018 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61191-1:2018 prescribes requirements for materials, methods and verification criteria for producing quality soldered interconnections and assemblies using surface mount and related assembly technologies. This part of IEC 61191 also includes recommendations for good manufacturing processes. This edition includes the following significant technical changes with respect to the previous edition:
- the requirements have been updated to be compliant with the acceptance criteria in IPC‑A-610F;
- the term "assembly drawing" has been changed to "assembly documentation" throughout;
- references to IEC standards have been corrected;
- Clause 9 was completely rewritten;
- Annex B was removed because there are already procedures for circuit board assemblies.

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IEC 60050-511:2018 gives the general terminology for electrotechnical products and systems reliant on nanomaterials for their essential functionalities. It is intended to facilitate communication between bodies and individuals in industry and those who interact with them. This terminology is consistent with the terminology developed in the other specialized parts of the IEV.
It has the status of a horizontal standard in accordance with IEC Guide 108.

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IEC 60050-871:2018 gives the general terminology used in active assisted living, as well as general terms pertaining to specific applications and associated technologies. This terminology is consistent with the terminology developed in the other specialized parts of the IEV.
It has the status of a horizontal standard in accordance with IEC Guide 108.

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This part of IEC 61360 specifies principles for the definition of the properties and associated
attributes and explains the methods for representing verbally defined concepts with
appropriate data constructs available from IEC 61360-2. It also specifies principles for
establishing a hierarchy of classification from a collection of classes, each of which
represents a technical concept in the electrotechnical domain or a domain related to
electrotechnology.
The use of this document facilitates the exchange of technical data through a defined
structure for the information to be exchanged in a computer-sensible form. Each property to
be exchanged has an unambiguously defined meaning and consistent naming, where relevant
a defined value list, a prescribed format and defined units of measure for all quantitative
values. There is also provision for:
a) control of changes to definitions of the properties through version and revision numbers;
b) inclusion of notes and remarks to clarify and help in the application of the definitions;
c) indication of the sources of definitions and value lists;
d) associated figures and formulae.
NOTE IEC TCs and SCs, or other organizations can take this document as a basis for the development of their
own dictionaries.
Out of scope of this document are subjects concerning the information technology
infrastructure such as:
– security;
– database locking mechanisms;
– access rights management.

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IEC 60404-8-11:2018 defines the grades of Fe-based amorphous strip delivered in the semi‑processed state, i.e. without final heat treatment, of nominal thickness 0,025 mm. Other nominal thicknesses in the range from 0,020 mm to 0,030 mm can be specified by agreement between the manufacturer and the purchaser at the time of enquiry and order. In particular, it gives general requirements, magnetic properties, geometric characteristics, tolerances and technological characteristics, as well as inspection procedures.
This document applies to the rapidly-solidified Fe-based amorphous strip supplied in coils with as-cast edges and intended for the construction of magnetic circuits.
The grades are grouped into two classes:
- conventional grades;
- high permeability grades.
They correspond to Class I1 of IEC 60404-1.

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IEC 62820-3-2:2018 describes the basic application requirements for Advanced Security Building Intercom Systems (ASBIS) in public and private buildings with advanced safety and security needs. ASBIS are also used to meet the requirements of the Local Regulations of Workplace Safety and/or other relevant local regulations, in particular, protecting the life and limb of employees and all persons in the building, taking into account the inclusion of people with disabilities (e.g to achieve barrier-free access or calls for help) where required by local applicable law. The recommendations and requirements of IEC 62820-3-1 are mandatory for this document.

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