BSEN17088:2021

BSIStandardsPublication

Sidecurtainventilationsystems—Safety

bsi.

BSEN17088:2021BRITISHSTANDARD

Nationalforeword

ThisBritishStandardistheUKimplementationofEN17088:2021.

TheUKparticipationinitspreparationwasentrustedtoTechnicalCommitteeB/549,Agriculturalbuildingsandstructures.

Alistoforganizationsrepresentedonthiscommitteecanbeobtainedonrequesttoitscommitteemanager.

Contractualandlegalconsiderations

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reasonablenessofthispublication.Allandanysuchresponsibilityandliabilityisexpresslydisclaimedtothefullextentpermittedbythelaw.

Thispublicationisprovidedasis,andistobeusedatthe

recipient'sownrisk.

Therecipientisadvisedtoconsiderseekingprofessionalguidancewithrespecttoitsuseofthispublication.

Thispublicationisnotintendedtoconstituteacontract.Usersareresponsibleforitscorrectapplication.

Thispublicationhasbeenpreparedunderamandategiventothe

EuropeanStandardsOrganizationsbytheEuropeanCommissionandtheEuropeanFreeTradeAssociation.ItisintendedtosupportrequirementsoftheEUlegislationdetailedintheEuropeanForeword.AEuropean

Annex,usuallyAnnexZAorZZ,describeshowthispublicationrelatestothatEUlegislation.

FortheGreatBritainmarket(England,ScotlandandWales),ifUK

GovernmenthasdesignatedthispublicationforconformitywithUKCAmarking(orsimilar)legislation,itmaycontainanadditionalNationalAnnex.WheresuchaNationalAnnexexists,itshowsthecorrelation

betweenthispublicationandtherelevantUKlegislation.IfthereisnoNationalAnnexofthiskind,therelevantAnnexZAorZZinthebody

oftheEuropeantextwillindicatetherelationshiptoUKregulation

applicableinGreatBritain.ReferencestoEUlegislationmayneedtobereadinaccordancewiththeUKdesignationandtheapplicableUKlaw.

Furtherinformationondesignatedstandardscanbefoundat

/standardsandregulation

.

FortheNorthernIrelandmarket,UKlawwillcontinuetoimplementrelevantEUlawsubjecttoperiodicconfirmation.Therefore

AnnexZA/ZZintheEuropeantext,andreferencestoEUlegislation,arestillvalidforthismarket.

UKGovernmentisresponsibleforlegislation.Forinformationon

legislationandpoliciesrelatingtothatlegislation,consulttherelevantpagesof

.uk.

◎TheBritishStandardsInstitution2021

PublishedbyBSIStandardsLimited2021

ISBN9780580964954

ICS65.040.10;91.140.30

BRITISHSTANDARD

CompliancewithaBritishStandardcannotconferimmunityfromlegalobligations.

ThisBritishStandardwaspublishedundertheauthorityoftheStandardsPolicyandStrategyCommitteeon31July2021.

Amendments/corrigendaissuedsincepublication

DateTextaffected

BSEN17088:2021

BSEN17088:2021

EUROPEANSTANDARDNORMEEUROPEENNE

EUROP?ISCHENORM

EN17088

July2021

ICS65.040.10;91.140.30;C

EnglishVersion

Sidecurtainventilationsystems-Safety

Systèmesdeventilationàrideaulatéral-SécuritéLüftungssystememitSeitenvorhang-Sicherheit

ThisEuropeanStandardwasapprovedbyCENon30May2021.

CENmembersareboundtocomplywiththeCEN/CENELECInternalRegulationswhichstipulatetheconditionsforgivingthisEuropeanStandardthestatusofanationalstandardwithoutanyalteration.Up-to-datelistsandbibliographicalreferences

concerningsuchnationalstandardsmaybeobtainedonapplicationtotheCEN-CENELECManagementCentreortoanyCENmember.

ThisEuropeanStandardexistsinthreeofficialversions(English,French,German).AversioninanyotherlanguagemadebytranslationundertheresponsibilityofaCENmemberintoitsownlanguageandnotifiedtotheCEN-CENELECManagementCentrehasthesamestatusastheofficialversions.

CENmembersarethenationalstandardsbodiesofAustria,Belgium,Bulgaria,Croatia,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,ltaly,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,

Poland,Portugal,RepublicofNorthMacedonia,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TurkeyandUnitedKingdom.

EUROPEANCOMMITTEEFORSTANDARDIZATION

COMITEEUROPEENDENORMALISATION

EUROP?ISCHESKOMITEEFURNORMUNG

CEN-CENELECManagementCentre:RuedelaScience23,B-1040Brussels

◎2021CENAllrightsofexploitationinanyformandbyanymeansreservedRef.No.EN17088:2021E

worldwideforCENnationalMembers.

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ContentsPage

Europeanforeword 4

Introduction 5

1Scope 6

1.1General 6

1.2Exclusions 6

2Normativereferences 6

3Termsanddefinitions 7

4Listofhazards 9

5Requirements 10

5.1General 10

5.2Mechanicalrequirements 10

5.2.1General 10

5.2.2Mechanicalstrength 10

5.2.3Resistancetowindload 10

5.2.4Steelwireropes,syntheticropes,andstraps 11

5.2.5Mechanicaldurability 12

5.2.6Protectionagainstcuttingandabrasion 12

5.2.7Mechanicalmaintenance 12

5.3Requirementsformovingparts(excludingdrawing-inpoints.) 13

5.4Requirementsfordrawing-inpoints 13

5.4.1General 13

5.4.2Typeofmaterialcreatingdrawing-inpoint 14

5.4.3Typeofperson(s)incontactwiththesystem 15

5.4.4Drawing-inprotectionmeasures 16

5.4.5Scenarioswithindirectexposedrequirementsanddifferentpersons 17

5.4.6SelectionofProtectionMethodsforaDrawing-InPoint 2

5.5Electricalrequirements 23

5.5.1General 233

5.5.2Mainswitch 233

5.5.3Re-establishingpowertothesystem 23

5.5.4Protectionofcablestolivestock 23

5.6Emergencystop 233

5.6.1Architecture 23

5.6.2Wheretolocatetheemergencystop(s) 24

5.7Electromagneticcompatibility(EMC) 24

5.8Noise 24

5.9Documentation 25

5.9.1General 25

5.9.2Installation 25

5.9.3Labelling 25

5.9.4Handover 26

5.9.5Operationanduse 26

5.9.6Maintenanceandrepairs 27

5.9.7Dismantling 27

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6EvaluationofConformity 27

6.1General 27

6.2Statementofapplicablehazards 28

6.3Curtaintesting 28

6.3.1Initialtypetest 28

6.3.2Testonsite 28

6.4Verificationofrequirements 28

6.4.1General 28

6.4.2MechanicalRequirements(5.2) 30

6.4.3Mechanicalmaintenance(5.2.7) 30

6.4.4Movingparts,excludingdrawing-inpoints(5.3) 30

6.4.5Drawing-inpoints(5.4) 30

6.4.6Electrical(5.5) 30

6.4.7Noise(5.8) 30

6.4.8Productioncontrol 30

AnnexA(informative)Someexampleformsofsidecurtains 32

AnnexB(informative)Rolesandresponsibilitiesinthesupplychain 37

AnnexC(informative)Listofsignificanthazards 39

AnnexD(normative)Clarificationoftherequirementsforpulloutload 42

AnnexE(informative)Formriskanalysis,assessmentandreduction 46

AnnexF(normative)Resistancetowind 48

AnnexG(informative)Clarificationoftherequirementsforsafetybarriertoprovide'In-

directlyExposed'criteriafordrawing-inhazards 52

AnnexH(informative)EnvironmentalaspectsforSideCurtainVentilationSystems 54

AnnexZA(informative)RelationshipbetweenthisEuropeanStandardandthe

requirementsofDirective2006/42/ECaimedtobecovered 61

Bibliography ………………63

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Europeanforeword

Thisdocument(EN17088:2021)hasbeenpreparedbyTechnicalCommitteeCEN/TC422"Sidecurtainsventilationsystems-safety",thesecretariatofwhichisheldbyNEN.

ThisEuropeanStandardshallbegiventhestatusofanationalstandard,eitherbypublicationofanidenticaltextorbyendorsement,atthelatestbyJanuary2022,andconflictingnationalstandardsshallbewithdrawnatthelatestbyJanuary2022.

Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectofpatentrights.CENshallnotbeheldresponsibleforidentifyinganyorallsuchpatentrights.

ThisdocumenthasbeenpreparedunderastandardizationrequestgiventoCENbytheEuropeanCommissionandtheEuropeanFreeTradeAssociation,andsupportsessentialrequirementsofEUDirective2006/42/EC.

ForrelationshipwithEUDirective,seeinformativeAnnexZA,whichisanintegralpartofthisdocument.

Anyfeedbackandquestionsonthisdocumentshouldbedirectedtotheusers'nationalstandardsbody.AcompletelistingofthesebodiescanbefoundontheCENwebsite.

AccordingtotheCEN-CENELECInternalRegulations,thenationalstandardsorganisationsofthefollowingcountriesareboundtoimplementthisEuropeanStandard:Austria,Belgium,Bulgaria,Croatia,Cyprus,CzechRepublic,Denmark,Estonia,Finland,France,Germany,Greece,Hungary,Iceland,Ireland,Italy,Latvia,Lithuania,Luxembourg,Malta,Netherlands,Norway,Poland,Portugal,RepublicofNorthMacedonia,Romania,Serbia,Slovakia,Slovenia,Spain,Sweden,Switzerland,TurkeyandtheUnitedKingdom.

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Introduction

In2010,therewasafatalaccidentwhenachildofafarmerwastrappedbyanautomaticstabledisplay.ThisaccidenthappenedbothintheNetherlandsandBelgium.

ThisaccidenttriggeredsomeDutchexpertstousetheexistingDutchTechnicalAgreementNTA8344:2012“Sidecurtains-Safety"forthedevelopmentofthefirstEuropeanStandard"Sidesystemscurtainsventilationsystems-Safety".

Thisstandardisatype-CstandardasspecifiedinENISO12100:2010.

Themachineryconcernedandtheextenttowhichhazardsarecoveredareindicatedinthescopeofthisstandard.ThesehazardsarespecifiedtotheSidecurtainsventilationsystems.

WhereprovisionsofthistypeCaredifferentfromthosewhicharestatedbytypeAorBstandards,theprovisionsofthistypeCstandardtakeprecedenceovertheprovisionsoftheotherstandards,formachinesthathavebeendesignedandbuiltaccordingtotheprovisionsofthistypeCstandard.

Inordertomaketheobjectiveofthisconceptclearandeliminateuncertaintieswhenreadingit,thefollowingassumptionsaremade:

a)componentswithoutspecificrequirementsarecomponents

1)designedaccordingtothecommondesignandcalculationmethods,includingallfailuremechanisms;

2)ofasolidmechanicalandelectricalconstruction;

3)manufacturedfromsufficientlystrongmaterialwithasuitablequality;

4)ofwhichgeneralelectricalhazardsaredealtwithbyapplicationofthestandardsforelectricalinstallations,suchasEN60204-1:2018;

b)withtheexceptionofthefollowingprovisions,isamechanicalsupplybuiltaccordingtotherequirementsofgoodcraftsmanshipandtherequirementsinthisstandardconcept:

1)agreementsbetweenthemanufacturerandthebuyeraboutthespecialconditionsofuse,andplacewherethescreenisusedinconnectionwithhealthandsafety;

2)thelocationoftheinstallationwillbesuitableforthis;

3)theplaceofinstallationwillallowasafeuseofthescreen.

Theseassumptionsdonotlimittheneedforsufficientinformationinthisconceptstandardbeforeuse.

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1Scope

1.1General

Thisdocumentspecifiesthestandardizationofsidecurtainventilationsystemsasdefinedin3.1.Thisdocumentspecifiesthesafetyaspectsandperformance.Includedaremachinesthatoperateusingthepotentialenergystoredbytheearlierapplicationofhumanoranimalforce,suchasstretchedsprings.

Thisdocumentaddressesthefollowingsignificanthazardsassociatedwithsidecurtainsystems:

一crushing;

—cuttingorsevering;

—drawing-inortrapping;

-entanglement;—shearing;

-suffocation;

—electrocutionandshock;

一incorrectdesign,locationoridentificationofcontroldevices.

1.2Exclusions

Thisdocumentdoesnotapplytothefollowing,whichareintendedforadifferentuse:

-doorsandsidecurtainswhenusedasdoorswhicharespecifiedinEN13241:2003+A2:2016;

-systemsinflatedbyair;

—screenssuppliedforthecontroloffireorsmoke;

—screensthatmoveinstantaneouslyupontheapplicationofhumanforce;

-sidecurtainswhenusedtocontrolventilationconditionsinatoxicorexplosiveenvironment.

Thisdocumentisnotapplicabletosidecurtainventilationsystemsmanufacturedbeforethedateofitspublication.

2Normativereferences

Thefollowingdocumentsarereferredtointhetextinsuchawaythatsomeoralloftheircontentconstitutesrequirementsofthisdocument.Fordatedreferences,onlytheeditioncitedapplies.Forundatedreferences,thelatesteditionofthereferenceddocument(includinganyamendments)applies.

EN1991-1-4:20051),Eurocode1:Actionsonstructures-Part1-4:Generalactions-Windactions

EN14717:2005,Weldingandalliedprocesses-Environmentalchecklist

1)AsimpactedbyEN1991-1-4:2005/A1:2010.

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EN60204-1:2018,Safetyofmachinery-Electricalequipmentofmachines-Part1:Generalrequirements(IEC60204-1:2016)

ENIEC61000-6-2:2019,Electromagneticcompatibility(EMC)-Part6-2:Genericstandards-Immunitystandardforindustrialenvironments(IEC61000-6-2:2016)

EN61000-6-3:20072),Electromagneticcompatibility(EMC)-Part6-3:Genericstandards-Emissionstandardforresidential,commercialandlight-industrialenvironments(IEC61000-6-3:2006)

EN62061:20053),Safetyofmachinery-Functionalsafetyofsafety-relatedelectrical,electronicandprogrammableelectroniccontrolsystems(IEC62061:2005)

ENISO12100:2010,Safetyofmachinery-Generalprinciplesfordesign-Riskassessmentandriskreduction(ISO12100:2010)

ENISO13849-1:2015,Safetyofmachinery-Safety-relatedpartsofcontrolsystems-Part1:Generalprinciplesfordesign(ISO13849-1:2015)

ENISO13849-2:2012,Safetyofmachinery-Safety-relatedpartsofcontrolsystems-Part2:Validation(ISO13849-2:2012)

ENISO13850:2015,Safetyofmachinery-Emergencystopfunction-Principlesfordesign(ISO13850:2015)

ENISO13857:2019,Safetyofmachinery-Safetydistancestopreventhazardzonesbeingreachedbyupperandlowerlimbs(ISO13857:2019)

3Termsanddefinitions

Forthepurposesofthisdocument,thetermsanddefinitionsgiveninENISO12100:2010andthefollowingapply.

ISOandIECmaintainterminologicaldatabasesforuseinstandardizationatthefollowingaddresses:

●ISOOnlinebrowsingplatform:availableat

/obp

●IECElectropedia:availableat

/

3.1

sidecurtainventilationsystems

systemssuppliedforenvironmentalcontrol,installedonfarmbuildings,thatuseabarriermadefromaflexiblefoilorfabricwhichmovesviaarollingorfoldingaction,orrigidpanelsthatslide

3.2

automaticcontrol

actionwherethescreenisoperatedwithouthumanintervention

2)AsimpactedbyEN61000-6-3:2007/A1:2011.

3)AsimpactedbyEN62061:2005/A1:2013andEN62061:2005/A2:2015.

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3.3

environmentalaspect

elementofanorganization'sactivitiesorproductsorservicesthatcaninteractwiththeenvironmentNote1toentry:Asignificantenvironmentalaspecthasorcanhaveasignificantenvironmentalimpact.

[SOURCE:ENISO14001:2015,3.2.2-modified,Note1toentryhasbeenmodifiedandNote2toentryhasbeendeleted.]

3.4

environmentalimpact

changetotheenvironment,whetheradverseorbeneficial,whollyorpartiallyresultingfromanorganization'senvironmentalaspects

[SOURCE:ENISO14001:2015,3.2.4]

3.5

foldedscreen

curtainwhichismountedinsuchawaywhenopeneditisfolded

Note1toentry:InAnnexA,someversionsofsidecurtainventilationsystemswiththeiroperatingprinciplesarementioned.

3.6

lifecycleassessment

LCA

compilationandevaluationoftheinputs,outputsandthepotentialenvironmentalimpactsofaproductsystemthroughoutitslifecycle

[SOURCE:CEN/TR13910:2010,3.1]

3.7

moveablecurtain

automatically-ormanually-operated,mechanical-orelectric-poweredprotectionagainst,amongotherthings,weatherinfluences,capableofmoving

Note1toentry:Thecurtainhasapowerdrive:thiscanbemechanical,electrical,pneumaticorhydraulic.

3.8

packaging

allitemsmadeofanymaterialofanynaturetobeusedforthecontainment,protection,handling,deliveryandpresentationofgoods,fromrawmaterialstoprocessedgoods,fromtheproducertotheuserortheconsumer

Note1toentry:Inthisreport,thegoodsarereferredtoas"packagedproduct"or"product",inordertodistinguishitfromthepackaging.

[SOURCE:CEN/TR13910:2010,3.5]

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3.9

preventionofpollution

useofprocesses,practices,techniques,materials,products,servicesorenergytoavoid,reduceorcontrol(separatelyorincombination)thecreation,emissionordischargeofanytypeofpollutantorwaste,inordertoreduceadverseenvironmentalimpacts

Note1toentry:Preventionofpollutioncanincludesourcereductionorelimination,process,productorservicechanges,efficientuseofresources,materialandenergysubstitution,reuse,recovery,recycling,reclamationandtreatment.

[SOURCE:ENISO14001:2015,3.2.7]

3.10

rigidpanel

verticalliftingpanelforventilationpurposesmanuallyand/orpoweroperatedandinterlinkedbyaflexibledevice(e.g.cable,chain,rope...)

Note1toentry:Therigidpanelisinstalledonthewallofabuilding.

3.11

rollerblind

rollablecurtainwherethescreenrollsonatubeduringopeningandclosing

3.12

integratedsafetycomponent

componentwhichfulfilsasafetyfunctionwithinthecompletedmachineandcannotbeseparatedfrommachinerywithoutmodificationinthedesign,thereforecannotbeindependentlyplacedonthemarket

3.13

singlerollingcurtain

rollingelementofthecurtain,usuallyatthelowerextremityofthecurtain,takesinasinglefoilasitrotates,asshowninAnnexATypeD,TypeFandTypeH

3.14

doublerollingcurtain

rollingelementofthecurtain,usuallysituatedinthecentreofthecurtain,takesintwofoilsasitrotates,asshowninAnnexATypeE,TypeGandTypeI

3.15

pulseaction

amountanautomatedsidecurtainwillbedriveninacontinuousmovementbeforestopping

3.16

pauseinterval

periodoftimeanautomatedsidecurtainwillremainstationarybetweentwopulseactions

4Listofhazards

Thisclausecontainsallthesignificanthazards,riskareasandhazardoussituationsandeventsasfarastheyaredealtwithinthisdocument,identifiedbyriskassessmentperformedaccordingtoENISO12100:2010assignificantforthistypeofmachineryandwhichrequireactiontoeliminateorreducetherisk.SeeAnnexC,TableC.1.

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5Requirements

5.1General

Machineryshallcomplywiththesafetyrequirementsand/orprotective/riskreductionmeasuresofthisclause.Inaddition,themachineshallbedesignedaccordingtotheprinciplesinENISO12100:2010forrelevantbutnotsignificanthazardswhicharenotdealtwithbythisdocument.

Themanufacturershallperformariskanalyses,assessmentandreductionprocess.Foranexamplehowtoperformsuchaprocess,seeAnnexE.

5.2Mechanicalrequirements

5.2.1General

Sidecurtainsystemsshallbedesignedandconstructedsothattheyarecapableofbeinginstalled,maintained,repaired,usedanddismantledinasafemanner.

5.2.2Mechanicalstrength

Thesidecurtainanditscomponents,includingitsfixingsforattachmenttothebuilding,shallbedesignedsothat,duringnormaloperation,nopartofthesystem,includingthefixings,shallbepermanentlydeformed.

Thesidecurtainshallbedesignedsothatelasticdeformationsunderoperationalforcesortorqueswhichoccurduringnormalusedonotaffectthefunctionofthesystem.

Thedesignshallbeinaccordancewithrecognizedengineeringstress/yieldcalculationsortestmethodsusingadequatesafetyfactors,seeTable1,takingintoaccountthemostunfavourablestaticanddynamicforcesoccurringduringtheoperatingcycleortheuseofthesafetyequipmentwithinthesidecurtain.

Table1—Safetyfactors

Loadingconditions

Safetyfactorsforcalculation

purposes

Safetyfactorfortesting

purposes

Stressduetodifferentialpressure

1,5minbreakingstress

1,0

Stressduetootherloads(e.g.deadweight)

1,5minbreakingstress

1,0

5.2.3Resistancetowindload

Theresistancetowindloadofasidecurtainisitscapacitytowithstandaspecifieddifferentialwindpressure.

NOTETheconstructionofthesidecurtainsystemdependsonthepressureofanumberoffactorsincluding,e.g.themaximumwindspeedanticipatedinthearea,thelocation,height,sizeandshapeofthebuilding,andthepositionofthesidecurtainonthebuilding.

Whendefinitewindloadclassesorpressuresarenotstatedbythespecifier,sidecurtainsshallbedesignedinordertoresistspecifieddifferentialwindpressure,andshallbeclassifiedwiththewindloadclassesasspecifiedinAnnexF.SeeFigureF.1foratypicalwindmapofEurope.

Therequirementsofthisclauseapplytotheabilityoftheclosedsidecurtainandnottotheirabilitytobeopenedorclosedunderwindload.

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Forcorrectoperationofsidecurtains,themanufacturershallstatethemaximumwindspeed(withintheoperatinginstructions,5.9.4)wherethesystemcanbeoperatedwithoutriskoffailureofthesystem.

Thedeflectionofthecurtainorotherelementsresultingfromthedifferentialpressurespecifiedshallnotcausepermanentdeformationswhichwillaffectthefunctioningofthesystemorcreateanyriskofjamming.

5.2.4Steelwireropes,syntheticropes,andstraps

General

Steelwireropes,syntheticropes,andstraps,etc.shallbesuitablefortheintendedapplicationwithregardstostrength,durabilityandcorrosionresistance.

Forsuspensionelements,asinglewirerope,syntheticrope,orstrap,etc.canonlybeusedifafailureoftheelementwillresultinthecurtainfallingundergravityinasafemanner,i.e.thefallingcurtainwillberestrainedinacontrolledmannerthatwouldnotexposepeopleneartoittoincreasedriskofcrushing,shearing,entanglement,drawing-inortrapping.

Wheretwoormoresuspensionelementsareused,itshallbeensuredthatthedeadloadsaresharedinapre-determinedway.

Theguaranteedminimumbreakingstrengthofsuchasuspensionelementdeterminedbycalculationsofthemaximumloadithastosupport,multipliedbythesafetyfactor(Table1).

Allsuchsuspensionelementsshallhaveterminationsand/orjointswithabreakingloadofnolessthan90%ofthatoftheelement,orasuspensionelementsafetyfactordesignworkingload.Terminationsonadrumshallalwayshaveaminimumoftwofullturnsleftonadrumintheterminalposition.Measuresshallbetakentoensurethatterminationscannotbeaccidentallydetached.

Wheresuchsuspensionelementsentergroovesondrumsorpulleys,thedesignshallensurethattheelementsarealignedcorrectlytoallowentryofthesuspensionelements.

Suspensionelementdrumsmounteduptoaheightof2,7mabovefloorleveloranotherpermanentlevelshallbefittedwithaguard.

Steelwireropes

Forsteelwireropes,wherefailureoftheropewouldresultinincreasedlevelsofrisktocrushing,shearing,entanglement,drawing-inortrapping:

-eachsteelwireropeshallhaveasafetyfactorofnolessthan6(minimumbreakingstrength/staticload);

-ropepulleysandropedrumsshallhaveapitchcirclediameter(P.C.D.)atleastequalto20timestheropediameter;

-ropedrumsshallbegrooved,andtheropescoiledinonlyonelayer;

—ropepulleysshallbedesignedsothatthesteelwireropecannotjumpoutofthepulley.

Steelwireropesusedcommonlyinsystemstypicallywillnotresultinincreasedlevelsofrisk,i.e.ifthecurtainfallsdowninsafemanner(e.g.withinthewindbracing).Forsteelwireropeswherefailureoftheropewouldnotresultinincreasedlevelsofrisk:

-eachsteelwireropeshallhaveasafetyfactorofnolessthan3(minimumbreakingstrength/staticload);

-ropepulleysandropedrumswhichhaveapitchcirclediameter(P.C.D.)lessthan20timestheropediametershallbetestedsoastoascertainthenumberofcyclesuntilfailureofthecablewhen

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supportingthedesignload.Thisnumberofcyclesshallthenbeusedincalculatingtheservicelifeoftherope,andthisthenstatedintheoperatinginstructions,5.9.4,totheenduser

Syntheticropesandstraps

Forasyntheticropeorstrapwherefailureoftheropewouldresultinincreasedlevelsofrisktocrushing,shearing,entanglement,drawing-inandtrapping,theropeorstrapshallhaveasafetyfactornotsmallerthan6(minimumbreakingstrength/staticload)

Forasyntheticrope