INTERNATIONAL STANDARD IEC Edition Edition consolidated with amendments and IEC standard voltages This. The standard aims to consolidate AC and traction voltages within the industry and defines the following bands: band 1 – A.C. systems V to. IEC IEC standard voltages. a.c. and d.c. equipment having nominal voltages below V a.c. or below V d.c., the a.c. voltages being intended.

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The three-phase voltages are for use in either four-wire with neutral or three-wire without neutral systems. NOTE 1 The highest voltage for equipment is indicated for nominal system voltages higher than 1 V only. It is recommended that these values should not be used for new systems to be constructed in future.

Many questions sent in to the site are in connection with motor starting and in particular star-delta. Click here to view the notes indexed by tag.

Voltage Levels to IEC 60038

This publication shall not apply to voltages representing or transmitting signals or measured values. Information relating to this publication, including its validity, is available in the IEC Catalogue of publications see below in addition to new editions, volltages and corrigenda. The committee has decided that the contents of the base publication and its amendments 1 and 2 will remain unchanged until For example, edition numbers 1.

Three phase systems are derived from three separate windings, either connected in delta or star wye. The values are voltages between phases.

It is voltsges that, particularly for certain nominal system voltages, normal operation of equipment cannot be ensured up to this highest voltage for equipment, having regard to voltage-sensitive characteristics such as losses of capacitors, magnetizing current of transformers, etc. NOTE In the present table, the term “geographical area” may indicate a single country, a group of countries which agree to adopt the same voltage level, or a part of a very large country.


About the author myElectrical Engineering. For all but the simplest application, there is One method of dealing with this is symmetrical components. It is also recommended that only one of the two series of nominal voltages given for Series I should be used in any one country.

For the utilization 600388 range, in addition to the voltage variations at the supply terminals, voltage drops may occur within the consumer’s installations. Please help improve this article by introducing citations to additional sources. Each winding can be treated separately, leading Relevant discussion may be found on the talk page. It is recommended that only one of the two series should be used in any one country. A vertical line in the margin shows voktages the base publication has been modified by amendments 1 and 2.


Vooltages techniques exist to enable the correct selection of batteries for UPS applications. Please contact the Customer Service Centre see below for further information. Steven McFadyen Steven has over twenty five years experience working on some of the largest construction projects. The procedure described below is one of the more common. Standard Voltages, Current Ratings volfages Frequencies. List of International Electrotechnical Commission standards.

On-line information is also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda. NOTE 1 It is recommended that in any one country the ratio between two adjacent nominal voltages should be not less than two.

Enter the exact number of the standard: International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. Consolidated editions The IEC is now publishing consolidated versions of its publications. This article relies largely or entirely on a single source. Documents Flashcards Grammar checker. NOTE 2 It is understood that the equipment to be used in systems having nominal voltage not exceeding 1 V should be specified with reference to the nominal system voltage only, both for operation and for insulation.


Views Read Edit View history. The standard aims to consolidate AC and traction voltages within the industry and defines the following bands:.

For unbalance conditions the calculation of fault currents is more complex. It is recommended that in any one country only one value stancard the following groups should be used for the highest voltage for equipment: The standarrd of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields.

The electrical equipment of vehicles operating international services in these countries shall be capable of withstanding this absolute maximal voltage for brief periods of up to 5 min. Electric power distribution IEC standards Electrical wiring. Table 5 is systematically different, as the highest voltage for equipment is the characteristic value exceeding kV.

Voltage Levels to IEC

If you have some expert knowledge or experience, why not consider sharing this with our community. The IEC collaborates closely with the International Organization for Standardization ISO in accordance with conditions determined by agreement between the two organizations.

Exposure to time varying magnetic fields, from power frequencies to the gigahertz range can have harmful consequences. The enumeration begins at kV and ends with kV.