User guide

Toavoidanunintendeddisengagementofconnectors,useonlycompatibleconnectorswhenconnectingtotheanchorage.Ensureallconnectorscloseand
locksecurely.SeeFigure13inAppendixB.
NOTE:OSHA1926.502and1910.66requiresthatanchorsforaPFASbeabletoholdatleast5,000poundsofweightperpersonormaintainasafetyfactor
ofatleasttwo(twicetheimpactload)underthesupervisionofaqualifiedperson.AlsoensuretheanchorpointwillprovidesufficientMRFC.
4.3MinimumRequiredFallClearance:TheMRFCistheminimumdistanceauserneedsbetweenhimselfandthenearestobstruction(orground)below
thewalking/workingsurfacetoavoidseriousinjuryordeathincaseofafallevent.TheuserofthisequipmentmustdeterminetheMRFCforunits
discussedinthismanualtoensureadequateclearanceexistsinthefallpath.Variablesdiscussedinthismanualincludetheheightoftheanchorpoint
relativetotheuser’sFBHDring,i.e.,overheadornonoverheadanchoragecondition,
plusswingfall,andhowanexpandedworkzoneaffectsthese
variables.
4.4Overhead(AbovetheDring)AnchorageCondition:Inanoverheadanchoragecondition,theSRDisinstalledanywhereintheallowableattachment
area,whichrangesfromdirectlyabovetheusertoaslowastheleveloftheFBHDring,asshowninFigure3AinAppendix
A.Theoverheadcondition
MRFChasthreemetrics,labeledA,B,andC,measuredfromthewalking/workingsurface.Thesumtotalofthesemetrics,labeledD,istheMRFC.
A=SRDdecelerationdistance
B=Dringshiftandharnes
sstretch
C=Safetyfactor
TheMRFCforanoverheadanchorageiscalculatedasA+B+C=D.
4.5NonOverhead(BelowtheDRing)AnchorageCondition:Inanonoverheadanchoragecondition,theanchorpointislevelwiththeFBHdorsalDring,
orupto2'belowit,asshowninFigure3BinAppendixA.TheMRFCforabelowtheDringconditionhasfiveme
trics,labeledA,B,C,D,andE,andare
measuredfromthewalking/workingsurface.Thesumtotalofthesemetrics,labeledF,istheMRFC.
A=AnchorageDi
stancebelowDorsalDring
B=SRDDecelerationDistance
C=AdditionalDecelerationDistanceduetoBelowDringattachment
D=Dringshiftandharnessstretch
E=Safetyfactor
TheMRFCforananchoragebelowtheDringiscalculatedasA+B+C+D+E=F.Beawar
ethatiftheuseriskneelingorcrouchingwhileperformingwork,add
uptoanadditional3feettothetotalMRFC.
4.6SwingFall:Aswingfalloccurswhentheworkermoveslaterallyoutfromundertheanchorageandcreatesanexpandedworkzonecondition.See
Figure4inAppendixA.Ifafalleventoccurs,theworkerwouldswingbacktowardtheanchorage.Theswingingactiongeneratesconsiderableforce,andif
theworkerstrikesanobstructionormakescontactwiththelowerlevelortheground,thisforcecouldcausesevereinjuryordeath.
OverheadAnchorageandSwingFall:Foreachfoottheusermoveslaterallyinanydirectionawayfromtheanchorage,theworkzoneexpandsandswing
fallforcesincrease.ThisincreasedforcerequiresadditionalMRFCdistance.SeeChart1inAppendixAforinstructionsoncalculatingadditionalfall
clearancedistancecausedbyexpandedworkzoneswingfallconditions.
NonOverheadAnchorageandSwingFall:Aworkzoneexpandedbylateralmovementwillincreaseswingfallhazards,especiallyinanonoverhead
anchoragecondition.Chart1depictstherelationshipbetweenthedistanceoftheanchorinfeetbelowtheFBHDringandtheexpandedworkzone,
measuredinfeet.Theloweranchorpointofanonoverheadanchorage,combinedwiththelateraldistancefromtheanchoragemeasuredinfeet,means
theuserwillfallfurther,placingtheuseratextremeriskofsevereinjuryordeathincaseofcontactwithanobstruction,thelowerleve
l,ortheground.The
moretheworkzoneexpands,andthelowertheanchorageis,themoretheriskincreases.
WARNING
AnexpandedworkzonecombinedwithanSRDusedinanonoverhead(belowtheDring)conditionisextremelyhazardous.
DONOTattachtheunittoanypointmorethan2feetbelowtheleveloftheFBHDring.
4.7LockingSpeed:TheSRDutilizesacentrifugallockingmechanism.Thelockingfunctionrequiresacertainpayoutrateduringafalleventtofunction
correctly.Ifafalloccurs,apawlmechanismisengaged,whichappliesabrake,slowingandarrestingthefall.Certainsituations,confinedorcramped
spaces,shiftingfootingsuchassand,gravel,grain,oraslopedsurfacemaynotallowthelifelinetoreachsufficientspeedtoactivatethelockmechanism.A
clearpathisrequiredtoassurepositivelockingoftheSRD.
4.8InstallationandUseoftheSRD:TheSRD
maybeinstalledandusedasasingleunit,orasatwin.
4.8.1SingleSRD:OneSRDwithtwoorientationoptions;
Housingattachedtotheharness:TheSRDhousingendisinstalledtothedorsalDringofaFBHandthelegendattachedtoananchorage.Theanchorage
mayrangefromoverhead,toaslowas2'belowthedorsalDring.ReferbacktoFigure2AinAppendixA.
ToinstalltheSRDontheharnessseeFigure5AinAppendixA.Followthesesteps:
1. Dontheharnessinaccordancewiththeharnessmanufacturer’sinstructions.
2. InsertthenoseendofanANSIcompatibledoublelockingcarabinerthroughtheSRDhousingswiveleye.
3. AttachthecarabinertothedorsalDringoftheFBH.Ensurethecarabinerisorientedwiththelockopeningupandwilltaketheloadalongitsmajor
axis.Visuallyensurethecarabinerclosesandlockssecurely.
4. Connectthelegendconnectortoanapproved,suitableanchorthatmeetsworkzonerequirements.
TheSRDwillpayoutandretractsmoothlytomaintainatautlineduringnormalmovement.Workasdirectlyundertheanchoraspossible.Ifne
cessary,
attachthelegendconnectortoalowerlevelanchorage,upto2ft.belowtheuser’sharnessDring.Beawarethataloweranchorageincreasestheriskof
injuryduetoswingfall.Additionalfallclearanceisrequired.
DONOTusearebarhookoranylargethroatsnaphookorlarg
ecarabinertoinstallthehousingontheFBH,asthiscouldcauseasideloadandcreatean
unintentionaldisengagement.
Housingattachedtotheanchorage:AsinglelegSRDwiththehousingendattachedtoananchorageandthelegendconnectedtotheuser’sFBH.The
anchoragemayrangefromoverhead,toaslowas2'belowthedorsalDring.ReferbacktoFigure2B.ConnectthelegendconnectortothedorsalDring.
Toattachthehousingtoananchorage,seeFigure5Bandfollowthesesteps;
1. Dontheharnessinaccordancewiththeharnessmanufacturer’sinstructions.
2. Insert
thenoseendofanANSIcompatibledoublelockingcarabinerthroughtheSRDhousingswiveleye.
3. Attachthiscarabinertotheanchorpoint.Ensurethecarabinerisorientedwiththelockopeningupandwilltaketheloadalongitsmajoraxis.Visually
ensurethecarabinerclosesandlockscompletely.
4. Connectthele
gendconnectortothedorsalDringoftheFBH.Visuallyensuretheconnectorclosesandlockscompletely.
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