Obecné elektrotechnické normy

Komise : IEC/TC 10 (Fluids for electrotechnical applications)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 20.11.2019
Zobraz více Zobraz méně
 

This standard is intended to establish procedures and supervision that are required for the use and maintenance of natural ester liquid in sealed transformers and other electrical equipment.

This standard is applicable to natural esters, originally supplied conforming to IEC 62770 and other applicable Standards (e.g. ASTM D6871, etc.) in transformers, switchgear and electrical apparatus where liquid sampling is practical and where the normal operating conditions specified in the equipment specifications apply.

At present, there is a limited amount of information available for electrical equipment than transformers.

This standard is also intended to assist the power equipment operator to evaluate the condition of the natural ester and maintain it in a serviceable condition. It also provides a common basis for the preparation of more specific and complete local codes of practice. 

The standard includes recommendations on tests and evaluation procedures and outlines methods for reconditioning and reclaiming the liquid, when necessary.

Komise : IEC/TC 89 (Fire hazard testing)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 3.12.2019
Zobraz více Zobraz méně
 

This part of IEC 60695 describes a test method used to determine the characteristic heat flux for ignition (CHFI) from a non-contacting flame source for materials used in electrotechnical products, sub-assemblies or their parts. It provides a relationship between ignition time and incident heat flux. A test specimen cut from an end-product or sub-assembly can be tested by this test method.

This part of IEC 60695 can be used in the fire hazard assessment and fire safety engineering procedures described in IEC 60695-1-10, IEC 60695-1-11 and IEC 60695-1-12.

This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51.

One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the relevant publications.

Komise : IEC/SC 77A (Low frequency phenomena)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 10.12.2019
Zobraz více Zobraz méně
 

In the first paragraph, replace “a.c.” with “AC”.

In Note 2, replace "and future IEC/TR 61000-3-14" with "and IEC/TR 61000-3-14".

Komise : IEC/TC 89 (Fire hazard testing)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 24.12.2019
Zobraz více Zobraz méně
 

This part of IEC 60695-7 gives a brief summary of the test methods that are in common use in the assessment of the toxicity of fire effluent. It includes special observations on their relevance to real fire scenarios and gives recommendations on their use.

It advises which tests provide toxic potency data that are relevant to real fire scenarios, and which are suitable for use in fire hazard assessment and fire safety engineering.

The list of test methods is not to be considered exhaustive.

This summary cannot be used in place of published standards which are the only valid reference documents.

This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51.

One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the relevant publications.

Komise : IEC/TC 89 (Fire hazard testing)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 24.12.2019
Zobraz více Zobraz méně
 

This part of IEC 60695 specifies the glow-wire apparatus and common test procedure to simulate the effects of thermal stresses which may be produced by heat sources such as glowing elements or overloaded resistors, for short periods, in order to assess the fire hazard by a simulation technique.

The test procedure described in this standard is a common test procedure intended for the small-scale tests in which a standardized electrically heated wire is used as a source of ignition.

It is a common part of the test procedures applied to end products and to solid electrical insulating materials or other solid combustible materials.

A detailed description of each particular test procedure is given in the respective standards IEC 60695-2-11, IEC 60695-2-12 and IEC 60695-2-13.

This basic safety publication is intended for use by technical committees in the preparation of standards in accordance with the principles laid down in IEC Guide 104 and ISO/IEC Guide 51.

One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. The requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the relevant publications.

Komise : IEC/TC 25 (Quantities and units, and their letter symbols)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 31.12.2019
Zobraz více Zobraz méně
 

This part of IEC 80000 gives names, symbols, and definitions for quantities and units of electromagnetism. Where appropriate, conversion factors are also given.

Oblast zaměření: Magnetické slitiny
Komise : IEC/TC 68 (Magnetic alloys and steels)
Původce: ISO\IEC\CEN\CENELEC
K připomínkám do: 7.01.2020
Zobraz více Zobraz méně
 

Scope

This part of IEC 60404 defines the grades of cold-rolled grain-oriented electrical steel strip and sheet in nominal thicknesses of 0,20 mm, 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm. In particular, it gives general requirements, magnetic properties, geometric characteristics, tolerances and technological characteristics, as well as inspection procedures.

This document applies to Goss textured grain-oriented electrical steel strip and sheet supplied in the final annealed condition in coils or sheets, and intended for the construction of magnetic circuits.

The grades are grouped into three classes:

conventional grades;

high permeability grades;

magnetic domain refined high permeability grades.

They correspond to Class C22 of IEC 60404-1.