Safety of power transformers, power supply units and similar devices - Part 2-23: Particular requirements for transformers for construction sites

Applies to stationary or portable single-phase or poly-phase air-cooled (natural or forced) independent or associated, isolating or safety isolating transfromers intended for use on construction sites, having a rated supply voltage not exceeding 1 000 V a.c., and a rated frequency not exceeding 500 Hz. This part 2-23 is intended to be used in conjunction with EN 61558-1. It has the status of a group safety publication in accordance with IEC Guide 104.

Sicherheit von Transformatoren, Netzgeräten und Dergleichen - Teil 2-23: Besondere Anforderungen an Transformatoren für Baustellen

Sécurité des transformateurs, blocs d'alimentation et dispositifs analogues - Partie 2-23: Règles particulières pour les transformateurs pour chantiers

Applicable aux transformateurs de séparation des circuits et aux transformateurs de sécurité fixes ou mobiles, monophasés ou polyphasés, à refroidissement par air (naturel ou forcé), associés ou indépendants, destinés à être utilisés sur les chantiers, ayant une tension primaire assignée ne dépassant pas 1 000 V en courant alternatif, et une fréquence assignée ne dépassant pas 500 Hz. La présente partie 2-23 est destinée à être utilisée avec la EN 61558-1. Elle a le statut de publication groupée de sécurité conformément au Guide CEI 104.

Safety of power transformers, power supply units and similar devices - Partr 2-23: Particular requirements for transofrmers for construction sites (IEC 61558-2-23:2000)

General Information

Status
Withdrawn
Publication Date
26-Nov-2000
Current Stage
6060 - Document made available
Due Date
27-Nov-2000
Completion Date
27-Nov-2000

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Safety of power transformers, power supply units and similar devices - Partr 2-23: Particular requirements for transofrmers for construction sites (IEC 61558-2-23:2000)Sicherheit von Transformatoren, Netzgeräten und Dergleichen -- Teil 2-23: Besondere Anforderungen an Transformatoren für BaustellenSécurité des transformateurs, blocs d'alimentation et dispositifs analogues -- Partie 2-23: Règles particulières pour les transformateurs pour chantiersSafety of power transformers, power supply units and similar devices -- Part 2-23: Particular requirements for transformers for construction sites91.200Gradbena tehnologijaConstruction technology29.180Transformatorji. DušilkeTransformers. ReactorsICS:Ta slovenski standard je istoveten z:EN 61558-2-23:2000SIST EN 61558-2-23:2001en01-oktober-2001SIST EN 61558-2-23:2001SLOVENSKI

STANDARD
SIST EN 61558-2-23:2001
SIST EN 61558-2-23:2001
SIST EN 61558-2-23:2001
SIST EN 61558-2-23:2001
SIST EN 61558-2-23:2001

NORMEINTERNATIONALECEIIECINTERNATIONALSTANDARD61558-2-23Première éditionFirst edition2000-05Sécurité des transformateurs, blocs d'alimentationet dispositifs analogues –Partie 2-23:Règles particulières pour les transformateurspour chantiersSafety of power transformers, power supply unitsand similar devices –Part 2-23:Particular requirements for transformersfor construction sites Commission Electrotechnique Internationale International Electrotechnical CommissionPour prix, voir catalogue en vigueurFor price, see current catalogueÓ IEC 2000

Droits de reproduction réservés

Copyright - all rights reservedAucune partie de cette publication ne peut être reproduite niutilisée sous quelque forme que ce soit et par aucun procédé,électronique ou mécanique, y compris la photocopie et lesmicrofilms, sans l'accord écrit de l'éditeur.No part of this publication may be reproduced or utilized inany form or by any means, electronic or mechanical,including photocopying and microfilm, without permission inwriting from the publisher.International Electrotechnical Commission3, rue de Varembé

Geneva, SwitzerlandTelefax: +41 22 919 0300e-mail: inmail@iec.ch IEC web site

http://www.iec.chCODE PRIXPRICE CODERPUBLICATION GROUPÉE DE SÉCURITÉGROUP SAFETY PUBLICATIONSIST EN 61558-2-23:2001

61558-2-23 Ó IEC:2000– 3 –CONTENTSPageFOREWORD..........................................................................................................................5Clause1Scope..............................................................................................................................92Normative references.....................................................................................................113Definitions......................................................................................................................114General requirements.....................................................................................................115General notes on tests...................................................................................................116Ratings..........................................................................................................................117Classification.................................................................................................................138Marking and other information........................................................................................159Protection against accessibility to hazardous live parts...................................................1710Change of input voltage setting......................................................................................1711Output voltage and output current under load.................................................................1912No-load output voltage...................................................................................................1913Short-circuit voltage.......................................................................................................2314Heating..........................................................................................................................2315Short-circuit and overload protection..............................................................................2316Mechanical strength.......................................................................................................2317Protection against harmful ingress of dust, solid objects and moisture............................2718Insulation resistance and electric strength......................................................................2719Construction...................................................................................................................2720Components...................................................................................................................3121Internal wiring................................................................................................................3122Supply connection and other external flexible cables or cords.........................................3323Terminals for external conductors...................................................................................3324Provision for protective earthing.....................................................................................3325Screws and connections.................................................................................................3326Creepage distances, clearances and distances through insulation..................................3327Resistance to heat, abnormal heat, fire and tracking.......................................................3328Resistance to rusting......................................................................................................33Annex CCreepage distances and clearances – Material group II.........................................37Annex DCreepage distances and clearances – Material group I..........................................37Annex LRoutine tests (production tests)............................................................................37SIST EN 61558-2-23:2001

61558-2-23 Ó IEC:2000– 5 –INTERNATIONAL ELECTROTECHNICAL COMMISSION_________SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITSAND SIMILAR DEVICES –Part 2-23: Particular requirements for transformers for construction sitesFOREWORD1)The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprisingall national electrotechnical committees (IEC National Committees). The object of the IEC is to promoteinternational cooperation on all questions concerning standardization in the electrical and electronic fields. Tothis end and in addition to other activities, the IEC publishes International Standards. Their preparation isentrusted to technical committees; any IEC National Committee interested in the subject dealt with mayparticipate in this preparatory work. International, governmental and non-governmental organizations liaisingwith the IEC also participate in this preparation. The IEC collaborates closely with the International Organizationfor Standardization (ISO) in accordance with conditions determined by agreement between the twoorganizations.2)The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, aninternational consensus of opinion on the relevant subjects since each technical committee has representationfrom all interested National Committees.3)The documents produced have the form of recommendations for international use and are published in the formof standards, technical specifications, technical reports or guides and they are accepted by the NationalCommittees in that sense.4)

In order to promote international unification, IEC National Committees undertake to apply IEC InternationalStandards transparently to the maximum extent possible in their national and regional standards. Anydivergence between the IEC Standard and the corresponding national or regional standard shall be clearlyindicated in the latter.5)

The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for anyequipment declared to be in conformity with one of its standards.6)

Attention is drawn to the possibility that some of the elements of this International Standard may be the subjectof patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.International Standard IEC 61558-2-23 has been prepared by IEC technical committee 96:Small power transformers, reactors and power supply units: Safety requirements.It has the status of a group safety publication in accordance with IEC Guide 104: The preparationof safety publications and the use of basic safety publications and group safety publications(1997).The text of this standard is based on the following documents:FDISReport on voting96/144/FDIS96/148/RVDFull information on the voting for the approval of this standard can be found in the report onvoting indicated in the above table.This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.Future standards in this series will carry the new general title as cited above. Titles of existingstandards in this series will be updated at the time of the next revision.SIST EN 61558-2-23:2001

61558-2-23 Ó IEC:2000– 7 –This part 2-23 is intended to be used in conjunction with IEC 61558-1. It was established on thebasis of the first edition (1997) of that standard.This part 2-23 supplements or modifies the corresponding clauses in IEC 61558-1, so as toconvert that publication into the IEC standard: Particular requirements for transformers forconstruction sites.When a particular subclause of part 1 is not mentioned in this part 2-23, that subclause appliesas far as is reasonable. Where this standard states "addition", "modification" or "replacement",the relevant text of part 1 is to be adapted accordingly.In this standard, the following print types are used:–requirements proper: in roman type;– test specifications: in italic type;– explanatory matter: in smaller roman type.In the text of the standard the words in bold are defined in clause 3.Subclauses which are additional to those in part 1 are numbered starting from 101;supplementary annexes are entitled AA, BB, etc.The committee has decided that the contents of this publication will remain unchanged until2004-12. At this date, the publication will be·reconfirmed;·withdrawn;·replaced by a revised edition, or·amended.SIST EN 61558-2-23:2001

61558-2-23 Ó IEC:2000– 9 –SAFETY OF POWER TRANSFORMERS, POWER SUPPLY UNITSAND SIMILAR DEVICES –Part 2-23: Particular requirements for transformers for construction sites1 ScopeReplacement:This International Standard deals with all aspects of safety such as electrical, thermal andmechanical.This part of IEC 61558 applies to stationary or portable single-phase or poly-phase air-cooled(natural or forced) independent or associated, isolating or safety isolating transformersintended for use on construction sites, having a rated supply voltage not exceeding 1 000 Va.c., and a rated frequency not exceeding 500 Hz.The rated output should not exceed:–25 kVA for single-phase transformers;–40 kVA for poly-phase transformers.Isolating transformers for construction sites should have a no-load output voltage and arated output voltage exceeding 50 V a.c. and not exceeding 250 V a.c.Safety isolating transformers for construction sites should have a no-load output voltageand a rated output voltage not exceeding 50 V a.c.NOTE

This standard is applicable to transformers for the supply of electricity in locations as specified inIEC 60364-7-704. The latter also specifies the protection by using an earthed midpoint or starpoint of the outputwinding.Transformers for construction sites are to be used when required by the installation rules or bythe appliance specification for protection purposes.When the transformers are incorporated into low-voltage switchgear and controlgearassemblies for construction sites as specified in IEC 60439-4, the additional requirements ofIEC 60439-4 will apply to the assembly.This standard is applicable to dry-type transformers. The windings may be encapsulated ornon-encapsulated.NOTE 1

For transformers filled with liquid dielectric or pulverized material, such as sand, additional requirementsare under consideration.NOTE 2

Attention is drawn to the fact that– for transformers intended to be used in tropical countries, special requirements may be necessary;– in locations where special environmental conditions prevail, particular requirements may be necessary.This standard also applies to transformers incorporating electronic circuits. This standard doesnot apply to external circuits and their components intended to be connected to the input andoutput terminals or socket-outlets of the transformer.SIST EN 61558-2-23:2001

61558-2-23 Ó IEC:2000– 11 –2 Normative referencesThis clause of part 1 is applicable except as follows:Addition:IEC 60068-2-27:1987, Environmental testing – Part 2: Tests – Test Ea and guidance: ShockIEC 60364-7-704:1989, Electrical installations of buildings – Part 7: Requirements for specialinstallations – Section 704: Construction and demolition site installationsIEC 60439-4:1990, Low-voltage switchgear and controlgear assemblies – Part 4: Particularrequirements for assemblies for construction sites (ACS)3 DefinitionsThis clause of part 1 is applicable except as follows:Addition:3.101low-voltage switchgear and controlgear assembly for construction sites (ACS)combination of one or several transforming or switching devices with associated control,measuring, signalling, protective and regulating equipment complete with all their internalelectrical and mechanical connections and structural parts, designed and built for use on allconstruction sites, indoors or outdoors4 General requirementsThis clause of part 1 is applicable.5 General notes on testsThis clause of part 1 is applicable.6 RatingsThis clause of part 1 is applicable except as follows:Addition:6.101

The rated output voltage shall not exceed–250 V a.c. for isolating transformers with a non-earthed midpoint (single-phase) or a non-earthed starpoint (three-phase) or delta connection (three-phase);–110 V a.c. for isolating transformers with a midpoint (single-phase) earthed in theconstruction or a starpoint (three-phase) earthed in the construction;–50 V a.c. for safety isolating transformers.SIST EN 61558-2-23:2001

61558-2-23 Ó IEC:2000– 13 –The rated output voltage shall exceed 50 V a.c. for isolating transformers.Preferred values for the rated output voltage are–110 V and

230 V for portable, single-phase isolating transformers;–72 V, 110 V and 230 V for other isolating transformers;–6 V, 12 V, 24 V, 42 V and 48 V for safety isolating transformers.6.102

The rated output shall not exceed–25 kVA for single-phase isolating and safety isolating transformers;–40 kVA for polyphase isolating and safety isolating transformers.Preferred values for the rated output are–25 VA, 40 VA, 63 VA, 100 VA, 160 VA, 250 VA, 400 VA, 630 VA, 1 000 VA, 1 600 VA,2 500 VA, 4 000 VA, 6 300 VA, 10 kVA, 16 kVA and 25 kVA for single-phase transformers;–630 VA, 1 000 VA, 1 600 VA, 2 500 VA, 4 000 VA, 6 300 VA, 10 kVA, 16 kVA, 25 kVA and40 kVA for poly-phase transformers.Intermittent operation may be assigned only to portable transformers having a rated outputnot exceeding 6,3 kVA.6.103

The rated frequency shall not exceed 500 Hz.6.104
The rated supply voltage shall not exceed 1 000 V a.c.6.105

Intermittent operation transformers shall be intended for a rated operating time of5 min "on" and a resting time of 15 min "off".6.106

The supply current is limited to maximum 125 A and, in the case of flexible cable orsocket-outlet, to 63 A.7 ClassificationThis clause of part 1 is applicable except as follows:7.5

Replacement:According to their time of operation:–continuous operation;–intermittent operation.SIST EN 61558-2-23:2001

61558-2-23 Ó IEC:2000– 15 –8 Marking and other informationThis clause of part 1 is applicable except as follows:Replacement:8.1 h)

Construction sites transformers shall be marked with one of the graphical symbolsshown in 8.11.8.11

Addition:SymbolExplanationNumber ofsymbol inIEC 60417 1)Non-short-circuit-proof isolating transformer for constructionsitesShort-circuit-proof isolating transformer for construction sites(inherently or non-inherently)Fail-safe isolating transformer for construction sitesNon-short-circuit-proof safety isolating transformer forconstruction sitesShort-circuit-proof safety isolating transformer for constructionsites (inherently or non-inherently)1) All parts (1 and 2): 1998SIST EN 61558-2-23:2001

61558-2-23 Ó IEC:2000– 17 –SymbolExplanationNumber ofsymbol inIEC 60417 1)Fail-safe safety isolating transformer for construction sitesNon-short-circuit-proof isolating transformer for constructionsites with midpoint or starpoint earthedShort-circuit-proof isolating transformer for construction sites(inherently or non-inherently) with midpoint or starpoint earthedFail-safe isolating transformer for construction sites withmidpoint or starpoint earthed1) All parts (1 and 2): 19989 Protection against accessibility to hazardous live partsThis clause of part 1 is applicable.10 Change of input voltage settingThis clause of part 1 is applicable except as follows:Replacement:Stationary transformers with more than one rated supply voltage shall be so constructedt

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