IEC_62305-4_221_CC.pdf

81/221/CCCOMPILATION OF COMMENTS ON COMMITTEE DRAFTProject number:IEC 62305-4,Ed.1Reference number of the CD81/212/CDIEC/TC or SCTC 81Date of circulation2003-07-25Title of the TC or SC:Lightning protectionTitle of the committee draft:IEC 62305-4,Ed.1:Protection against lightning-Part 4:Electrical and electronic systems withinstructuresThe above-mentioned document was distributed to National Committees with a request that comments be submittedComments received see annex 1)DECISION OF THE CHAIRMAN(in cooperation with the secretariat)aA revised committee draft will be distributed as a committee draft for vote(CDV)by(date).bA revised committee draft will be distributed for comment by(date).cThe committee draft and comments will be discussed at the next meeting(date)2003-09-29NOTE In the case of a proposal a or b made by the chairman,P-members objecting to such a proposal shall inform theCentral Office with copy to the secretary in writing within 2 months of the circulation of this compilation(see ISO/IECDirectives,Part 1,2.5.3).Name or signature of the SecretaryG.B.Lo PiparoName or signature of the ChairmanC.BouquegneauFORM CC(IEC)2002-08-091)to be collated on Form Comments and annexed.2 81/221/CCAnnexDateDocument2003-07-2581/212/CDNationalCommitteeClause/SubclauseParagraphFigure/TableType ofcomment(General/Technical/Editorial)COMMENTSProposed changeOBSERVATIONS OF THESECRETARIATon each comment submittedDE 1GeneralTBecause IEC 62305-4 is not a standalone standard(as IEC 61312 series),itis necessary to consider IEC 62305-4together with the other parts of IEC62305.Therefore the DE comments refer alsoto these other parts if necessary.Fundamentally it has to be stated,thatthere are two different completeprotection systems for structures:a)62305-3 describes a system called“LPS”to protect against PHYSICAL DAMAGE TOSTRUCTURES AND LIFE HAZARD offeringa bundle of defined protection measuresb)62305-4 describes a system called“LPM system”to protect Electrical andelectronic systems within structures.Offering several protection measuresshall be combined to a complete tailoredLPM system.This philosophy has to be describedclearly in 62305-1 and shall befollowed consequently in the otherparts.Agreed.IEC 62305-1 follows yet thisphilosophy.DE 2GeneralTIntroduce LPM system in IEC 62305-1:e.g.give clear guidance in clause 7.3:Possible protection measures are:a)for structuresLPM system(Figure 3):-earthing measures-bonding measures(including SPDs)-spatial shielding-line routing and shieldingChange IEC 62305-1 clause 7.3accordinglyAgreed.Clause 7.3 of IEC 62305-1should be updated as follows:“a)for structures LEMP protection system(LPM)LEMP protection measures system(LPM system)will be changedthrough all IEC 62305 as”LEMPprotection system(LPM)”DE 3All parts ofIEC 62305TAnnex B form IEC 62305-3“Lightningcurrent flowing through externalconductive parts and lines entering thestructure”is very important for IEC62305-4,but useful as well for IEC62305-5 and 3.Therefore it shall betransferred to IEC 62305-1.Transfer this Annex to IEC 62305-1.Annex B relates only to directlightning flashes to the structure.Transfer this Annex to IEC 62305-1and modify it taking into accountAnnex K of IEC 81/1917NP.3 81/221/CCNationalCommitteeClause/SubclauseParagraphFigure/TableType ofcomment(General/Technical/Editorial)COMMENTSProposed changeOBSERVATIONS OF THESECRETARIATon each comment submittedDE 4EntirepaperTAs decided earlier by WG3,aninformative Annex with examples for theinfluencing factors on the sharing of thelightning current is very important.Add the former Annex Factorsinfluencing the sharing of thelightning current See DE 3.GB 1GeneralThis document does reflect universalbest practice and is not yet ready fordevelopment as a formal standard.TheUK NC considers that its futuredevelopment should be as a TR.According to TC 81 decision IEC62305-4 will be a standard;effortsshould be made to improve81/212/CD.PL 1GeneralThe document is well prepared-onlysome small changes are needed.Agreed.DK1Contents7.2.3EOszillationsoscillationsAgreed.CN 1IntroductionPar8tedue to equivalent resistancedue to equivalent impedanceIt will be changed in“Conventionalearth impedance”CN 2IntroductionPar8tedue to cable shield resistancedue to cable shield impedanceResistance is more conservative.DK2IntroductionLine 3E“.of milli-joules in sensitive electronicequipment,which might affectelectrical.”“.which might affect sensitiveelectronic equipment in electrical.”Agreed.DK3IntroductionLine 18E“.can be caused due to the lightning.”“.can be caused by lightning.”Agreed.DK4IntroductionLine 24E“.and electronic systems via linesitself.“.and electronic systems via thelines.”Agreed.IT 1Introduct.EditorialModify the text as follows:“The need.effects of lightning;particularly for the systems used inmany branches.”Agreed.CN 31.ScopePar1edSuch LPM systemSuch LPM(LEMP protectionmeasures)systemAgreed.See DE 5.DK51 ScopePar 2 Line2E“.may arise in malfunctioning ofelectronic system.”“.may cause ma