29 - ELECTRICAL ENGINEERING
ICS 29 Details
ELECTRICAL ENGINEERING
ELEKTROTECHNIK
ELECTROTECHNIQUE
ELEKTROTEHNIKA
General Information
Frequently Asked Questions
ICS 29 is a classification code in the International Classification for Standards (ICS) system. It covers "ELECTRICAL ENGINEERING". The ICS is a hierarchical classification system used to organize international, regional, and national standards, facilitating the search and identification of standards across different fields.
There are 19458 standards classified under ICS 29 (ELECTRICAL ENGINEERING). These standards are published by international and regional standardization bodies including ISO, IEC, CEN, CENELEC, and ETSI.
The International Classification for Standards (ICS) is a hierarchical classification system maintained by ISO to organize standards and related documents. It uses a three-level structure with field (2 digits), group (3 digits), and sub-group (2 digits) codes. The ICS helps users find standards by subject area and enables statistical analysis of standards development activities.
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IEC 60669-2-3:2024 applies to time-delay switches (hereinafter referred to as TDS) with a rated voltage not exceeding 440 V AC and a rated current not exceeding 63 A, intended for household and similar fixed electrical installations, either indoors or outdoors, operated by hand and/or by remote control. For the control circuit, the rated control voltage does not exceed 440 V AC or 220 V DC. This fourth edition cancels and replaces the third 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) Revision of the present edition with reference to IEC 60669-1:2017 (Edition 4);
b) Introduction of a revision to Annex E "Additional requirements and tests for switches intended to be used at a temperature lower than −5 °C".
- Standard24 pagesEnglish languagee-Library read for1 day
This document applies to system referencing conductor switching devices (3.3) (SRCSD) for household and similar uses within a Prosumer’s electrical installations (PEI (3.1)).
The SRCSD (3.3) provides functions as described in IEC 60364-8-82:2022 [2], 82.8.2.2.4.
PEI (3.1) intended for operating by either being connected to a distribution network or disconnected from the distribution network is an islandable PEI (3.7).
Intentional disconnection from and connection to the distribution network relies on the local earthing system being switched by the SRCSD (3.3). In addition, unintentional loss of distribution network is covered.
The SRCSD (3.3) is a single pole device intended to connect one live conductor of the power system to an earthing arrangement.
In general the neutral conductor is earthed.
Switching the SRCSD (3.3) can change the local type of system earthing if types of system earthing are different in island and grid connected modes.
The system referencing conductor switching device (3.3) (SRCSD) is interlocked with the switching device for islanding (3.4) (SDFI) of a Prosumer electrical installation.
SRCSD (3.3) can be integrated in a device with other functions e.g.. with a SDFI (3.4).
NOTE 1 See also IEC 60364-8-82 [1].
This document applies to SRCSD (3.3) for rated voltages not exceeding 440 V AC with rated frequencies of 50 Hz, 60 Hz or 50/60 Hz.
NOTE 2 SRCSD (3.3) for DC operations is under consideration.
- Standard80 pagesEnglish languagee-Library read for1 day
This document applies to portable residual current devices (PRCDs) for household and similar uses, consisting of a plug, a residual current device (RCD) and one or more socket-outlets or a provision for connection. They do not incorporate overcurrent protection. They are intended for single- and two-phase systems for rated currents not exceeding 16 A for rated voltages not exceeding 250 V AC, or for rated current not exceeding 32 A for rated voltages not exceeding 130 V AC to earth. They are intended to provide protection against shock hazard in case of direct contact, in addition to the protection provided by the fixed installations for the circuit downstream.
PRCDs have a rated residual operating current not exceeding 0,03 A.
The plug and socket-outlet parts of a PRCD are covered by the national standard of the country where the PRCD is placed on the market. If no national requirements exist, IEC 60884 1 is used.
This document applies to portable devices performing simultaneously the functions of detection of the residual current, of comparison of the value of this current with the residual operating value and of opening of the protected circuit when the residual current exceeds this value.
PRCDs providing an additional function of detecting faults on the supply side with a defined behaviour in case of supply failures or miswiring (PRCD-S) are also covered by this document.
PRCDs are not intended to be used as parts of fixed installations. Their connecting means can be plugs, socket-outlets, terminals or cords.
NOTE 1 The requirements for PRCDs are in compliance with the general requirements of IEC 60755. PRCDs are essentially intended to be operated by ordinary persons and designed not to require maintenance.
NOTE 2 An integral fuse is used, if necessary, for the relevant plug and socket-outlet system.
The switching contacts of the PRCDs are not intended to provide isolation, as isolation can be ensured by disconnecting the plug.
The requirements of this document apply for environmental conditions as defined in 7.1. Additional requirements can be necessary for PRCDs used in locations having more severe environmental conditions.
PRCDs including batteries are not covered by this document.
This document does not contain additional requirements for PRCDs without earthing contacts for which specific requirements can apply. This document can, however, be used as a guide for such devices which are intended to be used with Class II appliances only.
- Standard145 pagesEnglish languagee-Library read for1 day
IEC 60669-2-2:2024 applies to electromagnetic remote control switches (hereinafter referred to as electromagnetic RCS) with a rated voltage not exceeding 440 V AC and a rated current not exceeding 63 A, intended for household and similar fixed electrical installations, either indoors or outdoors. For the control circuit, the rated control voltage does not exceed 440 V AC or 220 V DC. This fourth edition cancels and replaces the third 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) Revision of the present edition with reference to IEC 60669-1:2017 (Edition 4);
b) Introduction of a revision to Annex E "Additional requirements and tests for switches intended to be used at a temperature lower than −5 °C".
- Standard24 pagesEnglish languagee-Library read for1 day
IEC TR 63179:2026, which is a Technical Report, provides technical information for planning high-voltage direct current (HVDC) systems with line-commutated converters (LCC), voltage sourced converters (VSC), or both. It provides general principles for deciding between HVDC and AC transmission systems, as well as processes and methods for preliminarily defining the HVDC transmission scheme, including selection of converter type and key parameters, grid stability analysis, and technical-economic comparison among various solutions. In addition, this document gives the objectives to be achieved in the planning phase.
This document is applicable for planning a point-to-point or a back-to-back HVDC system.
This document can also be used for DC grid systems (including multi-terminal HVDC systems) as a reference.
This document is not exhaustive. It is possible that there are other specific aspects, that are particularly important for a specific HVDC project.
- Technical report37 pagesEnglish languagesale 15% off
IEC 62358:2026 provides standard AL values (inductance factors) and their tolerances of Pot, RM, ETD, E, EER, EP, PQ, PM, EC, EFD and low-profile gapped ferrite cores.
This edition includes the following significant technical changes with respect to the previous edition:
a) addition of AL value (inductance factor) and its tolerance for PM-cores;
b) addition of AL value (inductance factor) and its tolerance for EC-cores;
c) addition of AL value (inductance factor) and its tolerance for EFD-cores.
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This document specifies a method for the high temperature exposure of protection sleeves for electrical cable and cable bundles for aerospace applications.
It is used together with EN 6059-100.
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- Amendment11 pagesEnglish languagee-Library read for1 day
IEC 61643-21:2025 is applicable to devices for surge protection against indirect and direct effects of lightning or other transient overvoltages. These devices are intended to be connected to telecommunications and signalling networks, and equipment rated up to 1 000 V RMS and 1 500 V DC. These telecommunications and signalling networks can also provide power on the same line, e.g. Power over Ethernet (PoE). Performance and safety requirements, tests and ratings are specified in this document. These devices contain at least one voltage-limiting component (clamping or switching) and are intended to limit surge voltages and divert surge currents. This second edition cancels and replaces the first edition published in 2000, Amendment1:2008 and Amendment 2:2012. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) New structure of IEC 61643-21 based on IEC 61643-01:2024; b) Several safety requirements based on IEC 61643-01:2024 have been added. This International Standard is to be used in conjunction with IEC 61643-01:2024.
- Draft80 pagesEnglish languagee-Library read for1 day
This document specifies methods for measuring the structural return loss of symmetrical cables for digital data transmission.
It is applicable together with EN 3475-100 and EN 50289-1-11. Attention is drawn in particular to correction procedures detailed in EN 50289-1-11:2016, Annex B, to minimize negative effects of cable preparation in the purpose of high frequency range measurements.
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This document specifies a method of testing the fire resistance of "fire-proof" electrical cables.
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This document specifies methods for measuring the transfer impedance of a cable.
It is intended to be used together with EN 3475-100 and IEC 62153-4-3.
- Standard5 pagesEnglish languagee-Library read for1 day
European common modification to EN 61936-1
- Amendment16 pagesEnglish languagee-Library read for1 day
- Corrigendum11 pagesEnglish languagee-Library read for1 day
Subscribe to IEC 60061 Database to access the full and updated content of the series.
- Corrigendum1 pageEnglish languagee-Library read for1 day
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IEC TS 62271-314:2024, a Technical Specification, applies to high-voltage direct current disconnectors and earthing switches, designed for indoor and outdoor installations and for operation on HVDC transmission systems having direct voltages of 100 kV and above.
It also applies to the operating devices of these disconnectors and earthing switches and their auxiliary equipment.
NOTE Disconnectors in which the fuse forms an integral part are not covered by this document
- Technical specification95 pagesEnglish languagee-Library read for1 day
IEC 60358-1:2025 is available as IEC 60358-1:2025 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60358-1:2025 This part of IEC 60358 applies to:
Coupling capacitors and capacitor dividers, with rated voltage > 1 000 V, connected line to ground with the low-voltage terminal either permanently earthed or connected to devices, for applications listed hereunder and other similar uses.
This document serves as a basic standard for the coupling capacitors and capacitor dividers.
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This part of IEC 62271 provides guidance to suppliers, manufacturers, users, and waste operators of high-voltage switchgear and controlgear as well as their assemblies having a rated voltage above 1 kV AC and 1,5 kV DC, together with their associated auxiliary equipment, on environmentally conscious design, and on assessing environmental impacts when used in systems. This document also gives guidance on effective communication of environmental information throughout the entire life cycle.
This document provides guidance on the process and general aspects to select UN sustainable development goals (UN sustainable development goals (SDG)), especially those dealing with health and environmental impacts and their assessments, represented respectively by:
• SDG 3-Good Health and Well-being;
• SDG 6-Clean Water and Sanitation;
• SDG 7-Affordable and Clean Energy;
• SDG 12-Responsible Consumption and Production;
• SDG 13-Climate Action;
• SDG 14-Life Below Water;
• SDG 15-Life on Land.
This document gives guidance on the process and general aspects to implement environmentally conscious product design (ECD) principles, as given in IEC 62430, essential
for high-voltage electrical power equipment and power control equipment.
This document gives guidance on executing the life cycle assessment (LCA) based on product category rules (PCR) in accordance with IEC 63366, ISO 14040 and ISO 14044 and on applying the Type III environmental declaration in accordance with ISO 14025, both for high-voltage switchgear and controlgear. This guidance provides standardized product specific rules (PSR) summarized as follows:
1) Common rules for the LCA process describing functional units, system boundaries, life cycle inventory analysis, scenarios, environmental impact categories;
2) Common rules for communicating information about the presence of regulated substances and the materials contained in the product, according to IEC 62474;
3) Common rules for communicating information about the end-of-life treatment of the product including material efficiency.
This document does not address the environmental declaration programme, however it can be used by program operators.
This document focuses on describing the LCA process referring to the functional unit, system boundary, scenarios, etc.
Owing to variability of influencing factors, such as flows, allocations, not balanced and timestable energy mix under different programmes, equipment customization, durability related to environmental conditions, it is not possible to compare two similar high-voltage switchgear and controlgear analysed in different contexts.
This document does not address by-products from arcing which are generated in sufficiently small quantities such that their environmental impact can be neglected. Any by-product generated by arcing during the use of equipment is strongly dependent on operating conditions and cannot a priori be qualified nor quantified. However, they are not expected to be released in air and will be managed at end-of-life by a dedicated process.
EXAMPLE
During the use of high-voltage switchgear and controlgear the handlings of normally arced gas are covered by IEC 62271-4. When the volume of gaseous by-product is below 1 % of normally arced gas, it is not considered compared to the cut-off rules specified in this document. The scenarios related to the system boundary do not take into account leakages from failures except if an agreement is reached on this between user and manufacturer (see Table 7, item h).
Power transformers, low-voltage switchgear and controlgear, and the interconnections with such equipment are not covered by this document. Therefore, assemblies according to IEC 62271-202 or IEC 62271-212 comprising any of the above equipment are not within the scope of this document.
This document supports material efficiency for circular economy. However, one of the major issues related to remanufacturing is the consideration of used parts
- Technical specification112 pagesEnglish languagee-Library read for1 day
IEC 61800-9-2:2023 specifies energy efficiency indicators of power electronics (complete drive modules (CDM), input or output sub drive modules (SDM), power drive systems (PDS) and motor starters, all used for motor driven equipment.
It defines IE and IES classes, their limit values and provides test procedures for the classification of the overall losses of the motor system.
Furthermore, this document proposes a methodology for the implementation of the best energy efficiency solution of drive systems. This depends on the architecture of the motor driven system, on the speed/torque profile and on the operating points over time of the driven load equipment. It provides a link for the energy efficiency evaluation and classification of the extended product.
This edition includes the following significant technical changes with respect to the previous edition:
a) Additional IES Classes defined to IES5;
b) Removed reference motor loss data and now point to IEC 60034-30-2;
c) Expanded and modified factors in Clause 6 for CDMs;
d) Annex C is now the Mathematical Model for CDM Losses;
e) Moved the mathematical model for the CDM to Annex C;
f) Added Sub Drive Input Module and Sub Drive Output Modules to Annex B;
g) Annex D is now the Converter Topology (old Annex C);
h) Annex E is now the Interpolation of Motor Losses (Old Annex D);
i) Annex E expanded to include various motor connections and updated interpolation method;
j) New Annex E for determination of Interpolation Coefficients;
k) Annex F is the old Annex E;
l) New Annex J Explanation of Correction Factors for the Reference Losses in Table 8.
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This part of IEC 62271, which is a Technical Specification, is applicable to direct current (DC) by-pass switches (BPS) and paralleling switches (PS) designed for indoor or outdoor installation and for operation on HVDC transmission systems having direct voltages of 100 kV and above.
Switches other than mechanical switching devices used for the same applications specified here are not covered by this document.
- Technical specification79 pagesEnglish languagee-Library read for1 day
IEC TS 62271-5:2024 applies to DC switchgear and controlgear designed for operation on HVDC transmission systems having direct voltages of 100 kV and above. This document applies to all high-voltage switchgear and controlgear for indoor and/or outdoor installation except as otherwise specified in the relevant IEC documents for the particular type of switchgear and controlgear.
- Technical specification146 pagesEnglish languagee-Library read for1 day
This document establishes a classification of surface insulations for electrical steel sheet, strip and laminations according to their general composition, relative insulating ability and function.
These surface insulations are either oxide layers or applied coatings.
The purpose of this classification is to create a nomenclature for the various types of surface insulations and to assist users of surface insulations by providing general information about the chemical nature and use of the surface insulations.
It is not the intent of this classification to specify insulation requirements in terms of specific values of surface insulation resistance. Such requirements are to be agreed between the purchaser and the steel producer, where applicable.
The classification is to be used in conjunction with the various specifications for cold rolled electrical steels (see Clause 2).
- Standard8 pagesEnglish languagee-Library read for1 day
IEC 62271-208:2025 gives practical guidance for the evaluation and documentation of the external steady state power-frequency electromagnetic fields which are generated by HV switchgear and controlgear assemblies and prefabricated substations. Basic requirements to measure or calculate the electric and magnetic fields are summarised for assemblies covered by IEC 62271-200 and IEC 62271-201, and for prefabricated substations covered by IEC 62271-202.
NOTE 1 The methods described in this document refer to three-phase equipment. However, the methodology can be used correspondingly for any single- or multi-phase equipment covered by this document.
This document applies to equipment rated for voltages above 1 kV up to and including 52 kV and power-frequencies from 15 Hz to 60 Hz. The electromagnetic fields which are generated by harmonics or transients are not considered in this document. However, the methods described are equally applicable to the harmonic fields of the power-frequency.
Detailed generic information on requirements and measurements of low-frequency electromagnetic fields is given in IEC 61786-1 and IEC 61786-2.
This document covers evaluation under factory or laboratory conditions before installation. The electric and the magnetic fields can be evaluated either by measurements or by calculations.
NOTE 2 Where practicable, the methods described in this document can also be used for installations on site.
It is not within the scope of this document to specify limit values of electromagnetic fields or methods for the assessment of human exposure.
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IEC 61800-5-1:2022 specifies requirements for adjustable speed electrical power drive systems (PDS) or their elements, with respect to electrical, thermal, fire, mechanical, energy and other relevant hazards. It does not cover the driven equipment except for interface requirements. It applies to adjustable speed electrical PDS which include the power conversion, basic drive module (BDM)/complete drive module (CDM) control, and a motor or motors.
Excluded are traction and electric vehicle BDM/CDM.
It applies to low-voltage adjustable speed electrical PDS intended to feed a motor or motors from a BDM/CDM connected to phase-to-phase voltages of up to and including 1,0 kV AC (50 Hz or 60 Hz) and up to and including 1,5 kV DC. It also applies to high-voltage adjustable speed electrical PDS intended to feed a motor or motors from a BDM/CDM connected to phase-to-phase voltages of up to and including 35 kV AC (50 Hz or 60 Hz) and up to and including 52 kV DC.
This document also applies to PDS which intentionally emits or receives radio waves for the purpose of radio communication.
This edition includes the following significant technical changes with respect to the previous edition:
a) harmonization with IEC 62477-1:2022;
b) harmonization with UL 61800-5-1 and CSA C22.2 No. 274, including an annex with a list of national deviation which was considered not possible to harmonize within a reasonable timeframe;
c) more detailed information about the evaluation of components according to this document and relevant safety component standards;
d) updated requirement for mechanical hazards including multiple IP ratings.
The contents of the corrigendum 1 (2023-09) have been included in this copy.
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European common modification to EN 61936-1
- Amendment16 pagesEnglish languagee-Library read for1 day
This European Standard is applicable to new low voltage devices for measurement, control and protection which are: — for indoor or outdoor fixed installations in traction systems, and — operated in conjunction with high voltage equipment with an a.c. line voltage and frequency as specified in EN 50163. This European Standard also applies to measurement, control and protective devices other than low voltage devices and not covered by a specific railway product standard as far as reasonably possible. Requirements of this document prevail. Scope of amendment Implementation of 2 technical changes: — Modification of subclause 5.4, second item in list of protection functions. — Aligning the value for short-circuit current of 50 Hz traction systems given in Annex A subclause A.2.1 ‘Line testing – General’ with EN 50388-1:2022 Table 7
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IEC 60092-378:2024 is applicable to shipboard and offshore optical fibre cables, intended for fixed installations.
Cables designed to maintain functional integrity during fire given in 6.1 and to be installed in explosive atmospheres given in 6.2 are included.
The various types of optical fibre cables are given in Clause 6. The constructional requirements and test methods are aligned with those indicated in IEC 60092‑350, unless otherwise specified in this document.
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This document specifies the functional requirements for output and accuracy of measurements of the dynamic interaction between pantograph and overhead contact line.
- Draft24 pagesEnglish languagee-Library read for1 day
IEC TS 63414:2025 is applicable for the determination of the AC and DC pollution flashover and withstand voltage characteristics of insulators with polymeric housing, to be used outdoors in HV applications and exposed to polluted environments. This is also applicable for insulators with hydrophobic coatings. This document refers to AC systems with a rated voltage greater than 1 000 V and DC systems with a rated voltage greater than 1 500 V.
The object of this technical specification is to prescribe standardized test methods, requirements and procedures for artificial pollution tests applicable to polymeric insulators for overhead lines including traction lines, station post and hollow insulators of equipment. Available test experience with polymeric station post and hollow insulators, especially for DC applications, is limited.
The proposed tests are not applicable to ceramic and glass insulators without polymeric housing, to greased insulators or to special types of insulators (e.g., insulators with semiconducting glaze).
Differently to ceramic and glass insulators without polymeric housing:
- The pollution performance of insulators with polymeric housing varies with the hydrophobicity condition of the surface. The specific conditions simulated by standardized tests might not represent the actual dynamic field conditions.
- The determination of the flashover and/or withstand voltage under pollution conditions is not enough for dimensioning. Additional constraints related to possible ageing are also to be considered.
- If the Hydrophobicity Transfer Material (HTM) test according to IEC TR 62039 confirms that an insulator is non-HTM, it can be tested according to IEC 60507 or IEC TS 61245.
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IEC 63522-4:2025 is used for testing along with the appropriate severities and conditions for measurements and tests designed to assess the ability of DUTs to perform under expected conditions of transportation, storage and all aspects of operational use.
The object of this test is to define a standard test method for the dielectric strength test.
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IEC 61811-1:2015 applies to electromechanical telecom elementary relays. Relays according to this standard are provided for the operation in telecommunication applications. However, as electromechanical elementary relays, they are also suitable for particular industrial and other applications. This standard selects from IEC 61810 series and other sources the appropriate methods of test to be used in detail specifications derived from this specification, and contains basic test schedules to be used in the preparation of such specifications in accordance with this standard. Detailed test schedules are contained in the detail specifications. This second edition of IEC 61811-1 cancels and replaces IEC 61811-1 published in 1999, IEC 61811-10 published in 2002, IEC 61811-11 published in 2002, IEC 61811-50 published in 2002, IEC 61811-51 published in 2002, IEC 61811-52 published in 2002, IEC 61811-53 published in 2002, IEC 61811-54 published in 2002, IEC 61811-55 published in 2002, and constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous editions:
a) to get one document for telecom relays;
b) update all relevant references.
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IEC 63093-5:2025 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of EP-cores made of ferrite, the essential dimensions of coil formers to be used with them and the locations of their terminal pins on a 2,50 mm printed wiring grid in relation to the base outlines of the cores and the effective parameter values to be used in calculations involving them. It also gives guidelines on allowable limits of surface irregularities applicable to EP-cores. The specifications contained in this document are useful in negotiations between ferrite core suppliers and users about surface irregularities. The general considerations upon which the design of this range of cores is based are as given in Annex A.
This edition includes the following significant technical changes with respect to the previous edition:
a) revision of Table 2 according to IEC 60205:2016.
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IEC 63093-2:2025 specifies the dimensions that are of importance for mechanical interchangeability for a preferred range of pot-cores made of ferrite, and the dimensional limits for coil formers to be used with them, as well as the effective parameter values to be used in calculations involving them. It also gives guidelines on the allowable limits of surface irregularities applicable to pot-cores in accordance with the relevant generic specification. The selection of core sizes and shapes for this document is based on the philosophy of including those sizes which are industrial standards, either by inclusion in a national standard, or by broad-based use in industry. The general considerations upon which the design of this range of cores is based are given in Annex A.
This edition includes the following significant technical changes with respect to the previous edition:
a) revision of Table 4 and Table 5 according to IEC 60205:2016.
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IEC TS 62271-314:2024, a Technical Specification, applies to high-voltage direct current disconnectors and earthing switches, designed for indoor and outdoor installations and for operation on HVDC transmission systems having direct voltages of 100 kV and above. It also applies to the operating devices of these disconnectors and earthing switches and their auxiliary equipment. NOTE Disconnectors in which the fuse forms an integral part are not covered by this document
- Technical specification95 pagesEnglish languagee-Library read for1 day
IEC TS 62271-316:2024 is applicable to direct current (DC) converter by-pass switches (CBPS) and paralleling switches (PS) designed for indoor or outdoor installation and for operation on HVDC transmission systems
- Technical specification79 pagesEnglish languagee-Library read for1 day
IEC TS 62271-5:2024 applies to DC switchgear and controlgear designed for operation on HVDC transmission systems having direct voltages of 100 kV and above.
- Technical specification146 pagesEnglish languagee-Library read for1 day
IEC TS 62271-320:2025 provides guidance to suppliers, manufacturers, users, and waste operators of high-voltage switchgear and controlgear as well as their assemblies having a rated voltage above 1 kV AC and 1,5 kV
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IEC 60216-1:2025 specifies the general ageing conditions and procedures to be used for deriving thermal endurance characteristics and gives guidance in using the detailed instructions and guidelines in the other parts of IEC 60216. Although originally developed for use with electrical insulating materials and simple combinations of such materials, the procedures are considered to be of more general applicability and are widely used in the assessment of materials not intended for use as electrical insulation. In the application of this document, it is assumed that a practically linear relationship exists between the logarithm of the time required to cause the predetermined property change and the reciprocal of the corresponding absolute temperature (Arrhenius relationship). For the valid application of this document, no transition, in particular no first-order transition, is expected to occur in the temperature range under study.
This edition includes the following significant technical changes with respect to the previous edition:
a) the definition for temperature index (TI) has been updated;
b) requirements for selection of related materials used, e.g. in different colours (5.1.2), have been added;
c) test procedure for thickness sensitivity (5.5 et 6.6) has been added;
d) Annex C "Concepts in earlier editions" has been deleted.
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IEC TS 63493-1:2025 specifies the main parameters to facilitate interchangeability or at least to define some frame conditions of MV bushings:
- with Um from 12 kV up to and including 52 kV;
- Ir from 630 A up to and including 3 150 A.
This document deals with non-capacitance graded bushings for Power Transformers, according to the IEC 60076 series (usually for transformer with conservator).
In this document only liquid to air bushings are considered. Bushings of liquid-to-liquid and air-to-air type and bushings for transformers with air-cushion in tank are not considered.
MV is considered up to 52 kV; this value is used to cover specific insulation levels or for high pollution levels, even if the field of application is very restricted.
Both solutions with external insulation in porcelain and polymeric can be used and need to enable interchangeability (in terms of mechanical and electrical performance).
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This document establishes a classification of surface insulations for electrical steel sheet, strip and laminations according to their general composition, relative insulating ability and function.
These surface insulations are either oxide layers or applied coatings.
The purpose of this classification is to create a nomenclature for the various types of surface insulations and to assist users of surface insulations by providing general information about the chemical nature and use of the surface insulations.
It is not the intent of this classification to specify insulation requirements in terms of specific values of surface insulation resistance. Such requirements are to be agreed between the purchaser and the steel producer, where applicable.
The classification is to be used in conjunction with the various specifications for cold rolled electrical steels (see Clause 2).
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IEC TR 63633:2025 provides information on safety related aspects relevant for the design and application of LED lamps that can be used as a replacement for lamps of different technology (for example, incandescent, fluorescent or HID).
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- Corrigendum11 pagesEnglish languagee-Library read for1 day
This document applies to portable residual current devices (PRCDs) for household and similar uses, consisting of a plug, a residual current device (RCD) and one or more socket-outlets or a provision for connection. They do not incorporate overcurrent protection. They are intended for single- and two-phase systems for rated currents not exceeding 16 A for rated voltages not exceeding 250 V AC. They are intended to provide protection against shock hazard in case of direct contact, in addition to the protection provided by the fixed installations for the circuit downstream. PRCDs have a rated residual operating current not exceeding 0,03 A. The plug and socket-outlet parts of a PRCD are covered by the national standard of the country where the PRCD is placed on the market. This document applies to portable devices performing simultaneously the functions of detection of the residual current, of comparison of the value of this current with the residual operating value and of opening of the protected circuit when the residual current exceeds this value. PRCDs providing an additional function of detecting faults on the supply side with a defined behaviour in case of supply failures or miswiring (PRCD-S) are also covered by this document. PRCDs are not intended to be used as parts of fixed installations. Their connecting means can be plugs, socket-outlets, terminals or cords. NOTE 1 The requirements for PRCDs are in compliance with the general requirements of IEC 60755. PRCDs are essentially intended to be operated by ordinary persons and designed not to require maintenance. NOTE 2 An integral fuse is used, if necessary, for the relevant plug and socket-outlet system. The switching contacts of the PRCDs are not intended to provide isolation, as isolation can be ensured by disconnecting the plug. The requirements of this document apply for environmental conditions as defined in 7.1. Additional requirements can be necessary for PRCDs used in locations having more severe environmental conditions. PRCDs including batteries are not covered by this document. This document does not contain additional requirements for PRCDs without earthing contacts for which specific requirements can apply. This document can, however, be used as a guide for such devices which are intended to be used with Class II appliances only.
- Draft11 pagesEnglish languagee-Library read for1 day
This document applies to portable residual current devices (PRCDs) for household and similar uses, consisting of a plug, a residual current device (RCD) and one or more socket-outlets or a provision for connection. They do not incorporate overcurrent protection. They are intended for single- and two-phase systems for rated currents not exceeding 16 A for rated voltages not exceeding 250 V AC, or for rated current not exceeding 32 A for rated voltages not exceeding 130 V AC to earth. They are intended to provide protection against shock hazard in case of direct contact, in addition to the protection provided by the fixed installations for the circuit downstream. PRCDs have a rated residual operating current not exceeding 0,03 A. The plug and socket-outlet parts of a PRCD are covered by the national standard of the country where the PRCD is placed on the market. If no national requirements exist, IEC 60884 1 is used. This document applies to portable devices performing simultaneously the functions of detection of the residual current, of comparison of the value of this current with the residual operating value and of opening of the protected circuit when the residual current exceeds this value. PRCDs providing an additional function of detecting faults on the supply side with a defined behaviour in case of supply failures or miswiring (PRCD-S) are also covered by this document. PRCDs are not intended to be used as parts of fixed installations. Their connecting means can be plugs, socket-outlets, terminals or cords. NOTE 1 The requirements for PRCDs are in compliance with the general requirements of IEC 60755. PRCDs are essentially intended to be operated by ordinary persons and designed not to require maintenance. NOTE 2 An integral fuse is used, if necessary, for the relevant plug and socket-outlet system. The switching contacts of the PRCDs are not intended to provide isolation, as isolation can be ensured by disconnecting the plug. The requirements of this document apply for environmental conditions as defined in 7.1. Additional requirements can be necessary for PRCDs used in locations having more severe environmental conditions. PRCDs including batteries are not covered by this document. This document does not contain additional requirements for PRCDs without earthing contacts for which specific requirements can apply. This document can, however, be used as a guide for such devices which are intended to be used with Class II appliances only.
- Standard145 pagesEnglish languagee-Library read for1 day
IEC 61643-11:2025 is applicable to devices for surge protection against indirect and direct effects of lightning or other transient overvoltages.
These devices are intended to be connected to AC power circuits and equipment rated up to 1 000 V RMS, the preferred frequencies taken into account in this document are 50/60 Hz. Other frequencies are not excluded. Performance and safety requirements, tests and ratings are specified in this document. These devices contain at least one nonlinear component and are intended to limit surge voltages and divert surge currents.
The test requirements provided by this document are based on the assumption that the SPD is connected to an AC power circuit fed by a power source providing a linear voltage-current characteristic. When the SPD is to be connected to a different kind of source or to a different frequency, careful consideration is required. This mainly applies with regard to system and fault conditions to be expected in such a system (e.g. expected short circuit current, TOV-stresses).
This document can apply for railway applications, when related product standards do not exist for that area or for certain applications.
Based on a risk assessment it might not be necessary to apply all requirements of this document to SPDs designed for specific power applications only, e.g. circuits with a low power capability, circuits supplied by nonlinear sources, circuits with protective separation from the utility supply.
NOTE 1 More information on risk assessment is provided in IEC Guide 116.
NOTE 2 Other exclusions based on national regulations are possible.
This edition includes the following significant technical changes with respect to the previous edition:
a) Specific requirements for SPDs for AC applications are now contained in this document, whereas the common requirements for all SPDs are now contained in IEC 61643-01;
b) Clarification on test application either to a complete SPD, to a "mode of protection", or to a complete "SPD assembly";
c) Additional measurement of voltage protection level on "combined modes of protection" between live conductors and PE;
d) Additional duty test for T1 and T2 SPDs with follow current to check variation of the follow current value at lower impulse currents;
e) Modified and amended short circuit current test requirements to better cover up to date internal SPD disconnector technologies;
f) Improved dielectric test requirements for the SPD's main circuits and added dielectric test requirements for "electrically separated circuits";
g) Additional clearance requirements for "electrically separated circuits".
The requirements of this document supplement, modify or replace certain of the general requirements contained in IEC 61643-01 and shall be read and applied together with the latest edition of IEC 61643-01, as indicated by the undated normative reference in Clause 2 of this document.
- Standard43 pagesEnglish languagee-Library read for1 day