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OS: Windows Software Terms: , , , , , , , , , Addin Page Number adds page numbers and more to PDF documents. Devices such as programmable controllers, programmable logic controllers PLCs and digital communication systems e. Please email me if you are unable to download a document Brian R. COMESA Standards are subject to review, to keep pace with technological advances. International Standard IEC 60038 has been prepared by IEC technical committee 8: Standard Voltages, Current Ratings and Frequencies. Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC, thus ensuring that the content reflects current technology. NOTE 2 It is recognized that for technical and economic reasons additional voltages may be required for certain specific fields of application. The lower values in the first and second columns are voltages to neutral and the higher values are voltages between phases. This publication shall not apply to standard voltages of components and parts used within electrical devices or items of equipment. These systems are usually complex, making it impossible in practice to fully determine every failure mode or to test all possible behaviour. The numbers of older IEC standards were converted in 1997 by adding 60000; for example IEC 27 became IEC 60027. Filename: Source: iso and iec standard pdfs now available to download from Time: 18-06-24 Tags:.
In Chapter 15 of the COMESA Treaty, Member States agreed to co-operate on matters of standardisation and Quality assurance with the aim of facilitating the faster movement of goods and services within the region so as to enhance expansion of intra-COMESA trade and industrial expansion. Co-operation in standardisation is expected to result into having uniformly harmonised standards. Harmonisation of standards within the region is expected to reduce Technical Barriers to Trade that are normally encountered when goods and services are exchanged between COMESA Member States due to differences in technical requirements. Harmonized COMESA Standards are also expected to result into benefits such as greater industrial productivity and competitiveness, increased agricultural production and food security, a more rational exploitation of natural resources among others. COMESA Standards are developed by the COMESA experts on standards representing the National Standards Bodies and other stakeholders within the region in accordance with international procedures and practices. Standards are approved by circulating Final Draft Harmonized Standards FDHS to all member states for a one Month vote. The assumption is that all contentious issues would have been resolved during the previous stages or that an international or regional standard being adopted has been subjected through a development process consistent with accepted international practice. COMESA Standards are subject to review, to keep pace with technological advances. Users of the COMESA Harmonized Standards are therefore expected to ensure that they always have the latest version of the standards they are implementing. This COMESA standard is technically identical to IEC 60038:2002, IEC Standard Voltages A COMESA Harmonized Standard does not purport to include all necessary provisions of a contract. Users are responsible for its correct application. INTERNATIONAL STANDARD IEC 60038 Edition 6. Missing page numbers correspond to the Frenchlanguage pages. Reference number IEC 60038:1983+A1:1994+A2:1997 E Publication numbering As from 1 January 1997 all IEC publications are issued with a designation in the 60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1. Consolidated editions The IEC is now publishing consolidated versions of its publications. For example, edition numbers 1. Further information on IEC publications The technical content of IEC publications is kept under constant review by the IEC, thus ensuring that the content reflects current technology. Information relating to this publication, including its validity, is available in the IEC Catalogue of publications see below in addition to new editions, amendments and corrigenda. On-line information is also available on recently issued publications, withdrawn and replaced publications, as well as corrigenda. Please contact the Customer Service Centre see below for further information. International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: Web: www. The object of the IEC is to promote international co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and in addition to other activities, the IEC publishes International Standards. Their preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with may participate in this preparatory work. International, governmental and non-governmental organizations liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization for Standardization ISO in accordance with conditions determined by agreement between the two organizations. Any divergence between the IEC Standard and the corresponding national or regional standard shall be clearly indicated in the latter. The IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60038 has been prepared by IEC technical committee 8: Standard Voltages, Current Ratings and Frequencies. This sixth edition supersedes the fifth edition of IEC 60038 1975 , and now includes standard voltages below 120 V a. It bears the edition number 6. A vertical line in the margin shows where the base publication has been modified by amendments 1 and 2. The committee has decided that the contents of the base publication and its amendments 1 and 2 will remain unchanged until 2003. This publication shall not apply to voltages representing or transmitting signals or measured values. This publication shall not apply to standard voltages of components and parts used within electrical devices or items of equipment. SECTION ONE — DEFINITIONS For alternating voltages, the voltages stated below are r. It excludes voltage transients, such as those due to system switching, and temporary voltage variations. It excludes voltage transients, such as those due to system switching, and temporary voltage variations. NOTE 1 The highest voltage for equipment is indicated for nominal system voltages higher than 1 000 V only. It is understood 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. In such cases, the relevant recommendations must specify the limit to which the normal operation of this equipment can be ensured. NOTE 2 It is understood that the equipment to be used in systems having nominal voltage not exceeding 1 000 V should be specified with reference to the nominal system voltage only, both for operation and for insulation. The lower values in the first and second columns are voltages to neutral and the higher values are voltages between phases. When one value only is indicated, it refers to three-wire systems and specifies the voltage between phases. The lower value in the third column is the voltage to neutral and the higher value is the voltage between lines. The transition period should be as short as possible and should not exceed the year 2003. Concerning supply voltage range, under normal service conditions, it is recommended that the voltage at the supply terminals should not differ from the nominal voltage of the system by more than ±10 %. For the utilization voltage range, in addition to the voltage variations at the supply terminals, voltage drops may occur within the consumer's installations. For low-voltage installations, this voltage drop is limited to 4 %, therefore, the utilization voltage range is +10 %, —14 % 1. This utilization range should be taken into account by Product Committees. It is recommended that these values should not be used for new systems to be constructed in future. In particular for a. The values indicated in the table above are the values agreed by the International Mixed Committee on Electric Traction Equipment C. 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. It is recommended that only one of the series should be used in any one country. 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. The values indicated are voltages between phases. The values indicated in parentheses should be considered as non-preferred values. It is recommended that these values should not be used for new systems to be constructed in future. NOTE 1 It is recommended that in any one country the ratio between two adjacent nominal voltages should be not less than two. NOTE 2 In a normal system of Series I, the highest voltage and the lowest voltage do not differ by more than approximately ±10 % from the nominal voltage of the system. In a normal system of Series II, the highest voltage does not differ by more then +5 % and the lowest voltage by more than —10 % from the nominal voltage of the system. It is recommended that only one of the two series should be used in any one country. It is recommended that in any one country only one value in the following groups should be used for the highest voltage for equipment: 123 kV-145 kV 245 kV-300 kV see table 5 -363 kV see table 5. It is recommended that these values should not be used for new systems to be constructed in future. The values are voltages between phases. It is recommended that these values should not be used for new systems to be constructed in future. The values are voltages between phases. Nominal values Nominal values Preferred Supplementary Preferred Supplementary V V V V 2,4 3 4 4,5 5 5 6 6 7,5 9 12 12 15 15 24 24 30 36 36 40 48 48 60 60 72 80 96 100 110 110 125 220 250 440 600 NOTE 1 Because the voltage of the primary and secondary cells is below 2,4 V, and the choice of the type of cell to be used in various applications will be based on properties other than the voltage, these values are not included in the table. The relevant IEC technical committees may specify types of cells and related voltages for specific applications. NOTE 2 It is recognized that for technical and economic reasons additional voltages may be required for certain specific fields of application. To make sure that we continue to meet your needs, your feedback is essential. Would you please take a minute to answer the questions overleaf and fax them to us at +41 22 919 03 00 or mail them to the address below. Nicht frankieren Ne pas affranchir A Prioritaire Non affrancare No stamp required RÉPONSE PAYÉE SUISSE Customer Service Centre CSC International Electrotechnical Commission 3, rue de Varembé 1211 GENEVA 20 Switzerland Q1 Please report on ONE STANDARD and ONE STANDARD ONLY. Enter the exact number of the standard: e. Q2 Please tell us in what capacity ies you bought the standard tick all that apply. Please assess the standard in the following categories, using the numbers: 1 unacceptable, 2 below average, 3 average, 4 above average, 5 exceptional, 6 not applicable timeliness............................................. Q8 Q4 If you ticked NOT AT ALL in Question 5 the reason is: tick all that apply Q9 R R R Please share any comment on any aspect of the IEC that you would like us to know:............................................................
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