IEC 62870 Edition 1 0 201 5 09 INTERNATIONAL STANDARD NORME INTERNATIONALE Electrical installations for l ighting and beaconing of aerodromes –Safety secondary circuits in series circuits – General sa[.]
I E C 62 ® Edition 201 5-09 I N TE RN ATI ON AL S TAN D ARD N ORM E I N TE RN ATI ON ALE colour i n sid e E l ectri cal i n s tal l ati on s for l i g h ti n g an d beacon i n g of aerod rom es –S afe ty s e d ary ci rcu i ts i n s e ri e s ci rcu i ts – G en e ral s afety req u i rem en ts I n s tal l ati on s él ectri q u es pou r l ’ écl rag e et l e bal i s ag e d e s aérod rom es – C i rcu i ts se d res d e s écu ri té d an s d es ci rcu i ts s é ri e – E xi g en ce s g é n éral e s IEC 62870:201 5-09(en-fr) d e s écu ri té T H I S P U B L I C AT I O N I S C O P YRI G H T P RO T E C T E D C o p yri g h t © I E C , G e n e v a , S wi tz e rl a n d All rights reserved Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or IEC's member National Committee in the country of the requester If you have any questions about I EC copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or your local I EC member National Committee for further information Droits de reproduction réservés Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur Si vous avez des questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence IEC Central Office 3, rue de Varembé CH-1 21 Geneva 20 Switzerland Tel.: +41 22 91 02 1 Fax: +41 22 91 03 00 info@iec.ch www.iec.ch Ab ou t th e I E C The I nternational Electrotechnical Commission (I EC) is the leading global organization that prepares and publishes I nternational Standards for all electrical, electronic and related technologies Ab o u t I E C p u b l i ca ti o n s The technical content of IEC publications is kept under constant review by the IEC Please make sure that you have the latest edition, a corrigenda or an amendment might have been published I E C Catal og u e - 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webstore i ec ch /csc Si vous désirez nous donner des commentaires sur cette publication ou si vous avez des questions contactez-nous: csc@iec.ch I E C 62 ® Edition 201 5-09 I N TE RN ATI ON AL S TAN D ARD N ORM E I N TE RN ATI ON ALE colour i n sid e E l ectri cal i n s tal l ati on s for l i g h ti n g an d beacon i n g of aerod rom es –S afe ty s e d ary ci rcu i ts i n s e ri e s ci rcu i ts – G en e ral s afety req u i rem en ts I n s tal l ati on s él ectri q u es pou r l ’ écl rag e et l e bal i s ag e d es aérod rom es – C i rcu i ts se d res d e s écu ri té d an s d es ci rcu i ts s é ri e – E xi g en ce s g é n éral e s d e s écu ri té INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE ICS 29.1 40.50; 93.1 20 ISBN 978-2-8322-2896-8 Warn i n g ! M ake s u re th at you obtai n ed th i s pu bl i ca ti on from an au th ori zed d i s tri bu tor Atten ti on ! Veu i l l ez vou s ass u rer q u e vou s avez obten u cette pu bl i cati on vi a u n d i stri b u teu r ag ré é ® Registered trademark of the International Electrotechnical Commission –2– I EC 62870: 201 © I EC 201 CONTENTS FOREWORD I NTRODUCTI ON Scope Norm ative references Terms and definitions Requirements for the SELV/PELV suppl y General SELV/PELV-safety demarcation line in an AGL series circuit Environm ental conditions 1 4 Degree of protection provided by enclosures 1 Electromagnetic compatibility (EMC) 1 Limits of electromagnetic emission 1 Limits of imm unity Marking Marking of the SELV/PELV power suppl y Marking at the installation locations Protection against electric shock Basic requirem ents Protective measure to be applied Protective separation from the prim ary series circuit Assemblies in the SELV/PELV suppl y Load of the SELV/PELV suppl y I nterfaces 4 Supply unit 4 Connectors Testing Type tests Routine tests Annex A (informative) System design selection Bibliograph y Figure – Safety demarcation line in a SELV system Figure – Safety demarcation line in a PELV system 1 Table A – Comparison of characteristics of PELV and SELV I EC 62870: 201 © I EC 201 –3– INTERNATI ONAL ELECTROTECHNI CAL COMMISSI ON E L E C T RI C AL I N S T AL L AT I O N S F O R LI G H TI N G AN D B E AC O N I N G O F AE RO D RO M E S – S AF E T Y S E C O N D ARY C I RC U I T S I N S E RI E S C I RC U I T S – G E N E R AL S AF E T Y RE Q U I RE M E N T S FOREWORD ) The I nternati on al Electrotechni cal Comm ission (I EC) is a worl d wid e organization for stan dardization com prisin g all n ation al el ectrotechnical comm ittees (I EC National Comm ittees) The object of I EC is to prom ote internati onal co-operation on all q uestions concerni ng stand ardi zati on in the el ectrical an d electronic fi elds To this en d and in additi on to other acti vities, I EC pu blish es I nternational Stan dards, Techn ical Specificati ons, Technical Reports, Publicl y Avail abl e Specificati ons (PAS) an d Gu ides (h ereafter referred to as “I EC Publication(s)”) Th ei r preparation is entrusted to tech nical comm ittees; any I EC N ational Comm ittee interested in the subj ect dealt with m ay partici pate in this preparatory work I nternational, governm ental an d n on governm ental organ izations l iaising with th e I EC also participate i n this preparation I EC collaborates closel y with the I ntern ational Organi zation for Stand ardization (I SO) in accordance with ditions determ ined by agreem ent between th e two organi zati ons 2) The form al decisions or ag reem ents of I EC on tech nical m atters express, as n early as possibl e, an i nternati onal consensus of opi nion on the rel evant subjects since each technical com m ittee has representati on from all interested I EC N ational Com m ittees 3) I EC Publications have the form of recom m endations for intern ational use an d are accepted by I EC National Com m ittees in that sense While all reasonable efforts are m ade to ensure that th e technical content of I EC Publications is accu rate, I EC cann ot be h eld responsi ble for th e way in which th ey are used or for an y m isinterpretation by an y en d u ser 4) I n order to prom ote intern ational u niform ity, I EC National Com m ittees und ertake to apply I EC Publications transparentl y to the m axim um extent possible i n their national an d regi on al publicati ons Any d ivergence between an y I EC Publication and the correspondi ng national or regi on al publicati on sh al l be cl earl y indicated in the latter 5) I EC itself d oes n ot provi de an y attestation of conform ity I n depend ent certificati on bodies provi de conform ity assessm ent services and, in som e areas, access to I EC m arks of conform ity I EC is not responsi ble for an y services carri ed out by ind ependent certification bodi es 6) All users shou ld ensure that th ey h ave the l atest editi on of thi s publicati on 7) No liability shall attach to I EC or its directors, em ployees, servants or ag ents inclu din g in divi du al experts an d m em bers of its tech nical com m ittees and I EC Nati onal Com m ittees for any person al i nju ry, property d am age or other dam age of any n ature whatsoever, whether di rect or indirect, or for costs (includ i ng leg al fees) and expenses arisi ng out of the publ ication, use of, or relian ce upon, this I EC Publicati on or any other I EC Publications 8) Attention is drawn to th e N orm ative references cited in th is publ ication Use of the referenced publ ications is indispensable for the correct applicati on of this publication 9) Attention is drawn to the possibility that som e of the elem ents of this I EC Publication m ay be the su bject of patent rig hts I EC shall not be held responsibl e for identifyi ng any or all such patent ri ghts I nternational Standard I EC 62870 has been prepared by I EC technical committee 97: Electrical installations for lighting and beaconing of aerodromes The text of this standard is based on the following docum ents: FDI S Report on votin g 97/1 67/FDI S 97/1 69/RVD Full information on the voting for the approval of this standard can be found in the report on voting indicated in the above table This publication has been drafted in accordance with the I SO/I EC Directives, Part –4– I EC 62870: 201 © I EC 201 The committee has decided that the contents of this publication will rem ain unchanged until the stability date indicated on the I EC website under "http: //webstore.iec ch" in the data related to the specific publication At this date, the publication will be • • • • reconfirmed, withdrawn, replaced by a revised edition, or amended I M P O RT AN T th a t it – Th e co n ta i n s u n d e rs t a n d i n g c o l o u r p ri n t e r of ' co l ou r c o l o u rs i ts i n si de' wh i ch c o n te n ts l ogo a re U s e rs on th e co ver c o n s i d e re d sh ou l d pag e to t h e re fo re of th i s be p ri n t p u b l i cati on u s e fu l th i s fo r i n d i c a te s th e d ocu m en t c o rre c t u si n g a I EC 62870: 201 © I EC 201 –5– INTRODUCTION With a few exceptions, aeronautical ground lighting is designed for series circuit technology operating with a constant current and a m axim um input voltage of 000 V a c rms, including tolerances The input voltage to the series circuit is constantl y adjusted by the constant current regulator to m aintain the series circuit current irrespective of the variations in the load The properties and characteristics of the constant current regulators are provided in I EC 61 822 Due to the structure of the series circuit, i.e a series connection of all loads, the usual protective devices for personnel protection of an I T, TT or TN network cannot be applied Aeronautical ground lighting is defined as an y light provided as an aid to air navigation and as such is subject to specific requirem ents with respect to its resilience, availability, and serviceability levels Therefore, insulation faults in the series circuit are often tolerated, and not lead to the automatic disconnection of the electrical suppl y to the series circuit I n view of the above I EC 61 821 states that no work of an y kind is normally perm itted on live series circuits without first conducting a suitable and sufficient Risk Assessm ent and using appropriate protective equipment according to I EC 61 821 The electrical characteristics of the constant current series circuits are often confused with those of I T, TT or TN networks, i e constant input voltage, equipm ent connected in parallel, and a load-dependent current I n practice, it is not always easy to assign rated voltages correctl y to individual components of the series circuit or to determine possible touch voltages I n a constant current series circuits, the rated voltage of the equipment in the series circuit and the maximum touch voltage frequentl y exceed the norm al m ains input voltage In a series circuit installation the series circuit input voltage is divided in proportion to the internal resistances of the various loads The rated voltage, i e the voltage between the input lines of the equipm ent, is defined by the series circuit current that flows through the equipm ent and its input impedance Since input impedance depends on the equipm ent design and the series circuit current is constant, the input voltage remains the same for each item of equipm ent As a result of the provision of current control in the series circuit the series circuit input voltage is load-dependent and corresponds to the sum of all partial voltages in the series circuit This is different to determ ining the maximum possible touch voltage to earth in a series circuit Since one or m ore earth faults, of varying resistance to earth, m aybe present, the touch voltage to earth may assum e an y value up to the maximum series circuit input voltage depending on the location of the earth fault and the equipment installed in the series circuit Therefore when determining the dielectric strength against earth potential it is usual to take the maximum series circuit input voltage Such peculiarities of the series circuit have been taken into account in the requirements for lam p systems in this standard Since there are onl y a few effective safety features available for personnel protection in series circuit technolog y the protective m easure “Safety extra low voltage (SELV)” and “Protective extra low voltage (PELV)” is applied in this standard for the suppl y of lamp systems This measure is comm on practice and can resort to the application of well-known and accepted methodolog y The introduction of SELV/PELV in this type of application has been m ade possible by the introduction of new illuminant technolog y that has lower power requirem ents and hence requires a lower voltage suppl y NOTE This stand ard is based on SELV specification accord i ng to I EC 60364-4-41 and I EC 61 558-1 –6– I EC 62870: 201 © I EC 201 E L E C T RI C AL I N S T AL L AT I O N S F O R LI G H TI N G AN D B E AC O N I N G O F AE RO D RO M E S – S AF E T Y S E C O N D AR Y C I RC U I T S I N S E RI E S C I RC U I T S – G E N E R AL S AF E T Y RE Q U I RE M E N T S S cop e This I nternational Standard specifies protective provisions for the operation of lam p system s powered by series circuits in aeronautical ground lighting The protective provisions described here refer onl y to secondary suppl y systems for loads that are electricall y separated from the series circuit This standard specifies the level of SELV, and alternativel y PELV, under consideration of additional personnel protection during work on live secondary circuits by electricall y skilled persons This standard also covers the special operati onal features of aeronautical ground lighting and addresses the level of training and the requirem ents for m aintenance procedures detailed in I EC 61 821 The requirements and tests are intended to set a specification framework for system designers, users, and maintenance personnel to ensure a safe and economic use of electrical systems in installations for the beaconing of aerodrom es This standard complem ents existing I EC Airfield-Ground- Lighting (AGL) standards and can be used as a design specification N o rm a t i ve re fe re n c e s The following docum ents, in whole or in part, are normativel y referenced in this docum ent and are indispensable for its application For dated references, onl y the edition cited applies For undated references, the latest edition of the referenced document (including an y amendments) applies I EC 60364-4-41 , Low-voltage electrical installations – Part 4-41 : Protection for safety – Protection against electric shock I EC 6041 7, Graphical symbols for use on equipment (available from : http://www graphical sym bols info/equipment) I EC 60529 , Degrees of protection provided by enclosures (IP Code) I EC 61 000-6-2, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards – Immunity for industrial environments I EC 61 000-6-4, Electromagnetic compatibility (EMC) – Part 6-4: Generic standards – Emission standard for industrial environments I EC 61 40, Protection against electric shock – Common aspects for installation and equipment I EC 62870: 201 © I EC 201 –7– IEC 61 558-2-4, Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 00 V – Part 2-4: Particular requirements and tests for isolating transformers and power supply units incorporating isolating transformers IEC 61 558-2-6, Safety of transformers, reactors, power supply units and similar products for supply voltages up to 1 00 V – Part 2-6: Particular requirements and tests for safety isolating transformers and power supply units incorporating safety isolating transformers IEC 61 821 , Electrical installations for lighting and beaconing of aerodromes – Maintenance of aeronautical ground lighting constant current series circuits I EC 61 822, Electrical installations for lighting and beaconing of aerodromes – Constant current regulators I EC 61 823, Electrical installations for lighting and beaconing of aerodromes – AGL series transformers CI SPR 1 , Industrial, scientific and medical equipment – Radio-frequency disturbance characteristics – Limits and methods of measurement CI SPR 22, Information technology equipment – Radio disturbance characteristics – Limits and methods of measurement Terms an d defi ni ti ons For the purposes of this docum ent, the following terms and definitions apply assem bl y self-contained, closed functional unit forming a lamp system together with other assemblies el ectri cal eq u i pm en t eq u i pm en t an ything used, intended to be used or installed for use, to generate, provide, transm it, transform, rectify, convert, conduct, distributes, control, store, m easure or use electrical energy 3 basi c protecti on protection against electric shock under fault-free conditions basi c i n su l ati on insulation of hazardous live parts providing basic protection Note to entry: The term “basic insul ation ” d oes not i nclud e insulation used excl usivel y for functional pu rposes el ectri cal l y ski l l ed person person with relevant education and experience to enable him or her to perceive risks and to avoid hazards which electricity can create [SOU RCE: I EC 60050-1 95: 998, 95-04-01 ] –8– I EC 62870: 201 © I EC 201 3.6 SELV/PELV power supply single ph ysical unit or an assem bl y of ph ysical units performing as the power suppl y according to SELV/PELV definitions 3.7 extra-low voltage ELV voltage not exceeding the relevant voltage limit specified in 3.8 lighting system the SELV/PELV power suppl y unit and all connected com ponents supplied from the SELV/PELV 3.9 safety extra-low voltage SELV voltage values of which does not exceed values in , between conductors, or between an y conductor and reference earth, in an electric circuit which has galvanic separation from the suppl ying electric power system by such m eans as a separate-winding transformer 3.1 SELV system electrical system in which the voltage cannot exceed the value of extra-low voltage: – under norm al conditions, and – under single-fault conditions, including earth faults in other electric circuits Note to entry: SELV is the abbreviati on for safety extra l ow voltag e [SOU RCE: I EC 60050-826: 2004, 826-1 2-31 ] 3.1 SELV-circuit ELV circuit with protective separation from other circuits, and which has neither provisions for earthing of the circuit nor of the exposed conductive parts Note to entry: SELV circuit does n ot includ e the housing of the light fi xtu re [SOU RCE: I EC 61 558-1 : 2005, 7, modified – addition of a note to entry] 3.1 electrically protective separation protective separation separation of one electric circuit from another by m eans of: – double insulation or – basic insulation and electricall y protective screening or – reinforced insulation 3.1 protective extra low voltage circuit PELV-circuit ELV circuit with protective separation from other circuits and which, for functional reasons, may be earthed and/or the exposed conductive parts of which m ay be earthed Note to entry: PELV-circuits are used where th e circuits are earthed an d SELV is not req uired