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| ICS 3.00.7 ;4 10
NO COPYIN WITHOU BSI PE MIS IO E C PT A S PE MIT E B COPY IGHT LA W
Trang 2ThisBrit ishSt and rd,havin
be nprep redu de t he
direct io oft heEn i ne rin
Sect orBo rd,wasp blshed
u de t hea t horit yoft he
St an ardsBo rda dc me int o
efcto 15Novembe 1 98
©BSI1 98
Thefo owin BSIrefren e
relat et ot heworko t his
st and rd:
Commit t eerefren eAUE/8
Draftforc mment96/715 7 DC
ISBN05 02 2 31
Amendmentsis ue sincepublcation
Am d.No Date Textafec ted
T h eprep rationofth isBritishStan dardw asen tru stedtoTe h n icalCom m i ttee
AU E/8,U n derg earforc ara an san dtrail er ,u po wh ichth efol low in gb dieswere
repres en ted:
Cara a Cl u b
Dep rtm en tofth eEn viron m en t, Tran sp rtan dth eR eg ion s
Nati on alCara a Cou n cilLim i ted
Nation alTrail eran dTow in gAss ociationL td
S cietyofMotorMan u fac tu rer an dTrader Li m i ted
Trang 3Cont ent s
P ag e
Trang 4T h isBri ti s hStan dardh asbe nprep redbyTe h n icalCom m i tte AU E/8
Asacodeofpractice,th isBri ti s hStan dardtakesth eformofg u idan cean d
re om m en dation s.I ts h ou l dn otbequ otedasi fitwereas pe ificati onan dp rticu l ar
caresh ou l dbetakentoen su reth atclai m sofcom plian cearen otm i s l eadi n g
EE Direc tive7 1/3 0/EEC,Brakin grequ i rem en tsan dEE R eg u l ationNo.13,requ i res
th efitti n gofabreakawayc abl eorse on darycou pli n go a trailer u ptoam axi m u m
g ros wei g h tof3 0 kg I ti sn owal s oarequ irem en tofth eCon stru ctionan dU se
R eg u lati on sth atsu chadevicei sp siti vel yattach edtoatowi n gveh icl e
ABri ti shStan darddoesn otpu rp rttoin cl u dea n ec s arypro i sion sofacon tract
U ser ofBritishStan dardsareres pon sibl eforth ei rcore ta pli c ation
Complancewith aBritish Standardd esnotofitselfconferimmu ity
f omle alo lg tions
Summaryofp g s
T h isdocu m en tcom prisesafon tco er,a in sidefon tco er,p g esian dii ,p g es1
an d2,a i n sideb ckco eran dab ckco er
Trang 51 Scope
This co e ofpr actic pr ovides r ecommen at io s for
breakawayca les andse o daryco plngs, andtheir
at t achmentp int s,forlghtt r ailer sorcar avans u t o
amas of35 0kg.I a ples totrailerswhichd n t
havebr akes orhave o er runoriner t iaty pe braking
sy st ems o ly
2 Terms and definitions
2.1
bre kawa ca le
ca le betwe n t hetowingvehicleandt het r aier
inclu ingitsfitment swhich, in the eventof
separ atio ofthe mainco plng, act ivates t he
braking me h nism ofthe t r ailer
2.2
secondary coupl ng
co plngdevic betwe nthe t r ailerand t owing
vehiclewhich,u o separ atio ofthemainco plng,
ensur est hatt het wovehiclesr emain co ne ted,
prevent st hen se oft hedr awbarto ching t he
grou dandpr ovidesr esid alste r ingforthe trailer
2.3
at achment p int
fit t ing (e.g closed h le, lo porey elet ) provided for
t heatt achmentofabr eakawaycableorse o d r y
co plngt o the towing vehicle
2.4
coupl ng
devic , usually madeintwop r t s, whichco ne ts
t het r aiert o t he towing vehicle
N T I alows ormovemen inal ax es,oft het wovehicle
a dwit hst andst heappledst at ica ddy namicloadsd rin
lo din a do erat io Ty pi calex mple areac u li ngheada d
t owb l ort owin ey ea djaw
3 Appl cation
Trailerswit h amas ofu t o35 0kg sh uldbe
fit t ed wit h eitherabr ea awaycableorase o dary
co plng Tr ailer s wit ho tbr akes sh uldhavea
maximummass of7 0kg andsh uldbefit t edwit h a
se o dar yco plng I isrecommen ed t hat t r ailer s
wit h brakes sh uldbefitt edwithabreakawaycable
4 Design
4.1 Bre kawa ca le
Thebr eakawaycablesh uld becapableofapply ing
asuficientlo dtothebr akingsy st emo er at ing
me hanism t oh ldthet r ailero atleast18%
gr adientatit s maximum permis ible t r aiermass
Up no er atio ofthebr eakawayca le, the t r ailer
sh uld be broughtt o ahaltwith utca singdamage
t ot he braking sy st emcomp nent sasaresultoft he
applcat io oft oogr eatano erating for ce
Thebr eakawaycable sh uldpartaftera plcat io of
t he t r ailerbrakeseitherbyreaso ofit s ult imat e
st r engthorbymeans ofaweakln insertedfort his
p r pose
Thecablesh uldbeprovided withadevic capable
ofpermitt ing at t achmentt ot heat t achment p intand
wit hst andingt heappled lo ds wit ho t faiur eu les
itprovides t he st res lmitfeat ur e
Thebr eakawaycable sh uldhavesuficientlengt ht o
enable att achmentt obe made wit hthe vehicle in
anyn r maltowingp sitio wit ho tr isk of
inadvertentbrake applcat io orcoming int oco tact
wit ht hegrou d Inor dert oensur e t hecomp tibi ty
oft hebreakawaycablewit hthebr akingsy st emo ly
t he t r ailermanufact ur er'soriginaleq ipmentcable or
eq ivalentsh uldbe used
4.2 Second ry couplngs
Se o d r yco plngs used fort he ret entio of
t r ailer s int heeventofmainco plng separatio
sh uldbedesigned t ohave anultimatetensie
strengt hofeq ivalentt oatleastt wic t hema imum
per mis ible mas oft het railer
5 At achment
5.1 General
Thebr eakawaycableorse o dar yco plngsh uld
beatt ached tothe towbar inaccor danc wit h 5.2
or5.3
N T Theprefrredmet ho isb directat t ac men s e5.2
5.2 Direct at achment
Thesprungh o orclpo t he en ofthe
br eakawaycableorse o dar yco plng sh uld be
at t acheddir ectly t o, orthrough, anatt achmentp int
o t he t owing vehicle
5.3 Loo e o er at achment
Thebr eakawaycableorse o dar yco plngsh uld
befixedbyfor mingalo p witht he h o orclpo
t he en oft hecablewhichisfixedbacko to the
cableto for malo p The lo psh uld t henbe
se ur edar ou d t he towing ballo the vehicle
5.4 Remo a le towing de ices
W hen t he t owing devic fit tedtothet owing vehicle
is r emovablewit ho tthe useofspe ial to ls, then
t hese o daryco plng orbr eakawaycable sh uld
beatt ached direct ly toanat tachmentp in which
sh uldn tbe o ,orp r tof,t hedetachable
comp nent (s)
5.5 Location
At tachmentp ints fort he breakawaycable or
se o dar yco plng sh uldbe p sitio edsothat the
n rmal articulatio andbrakingact io ofthetrailer
is n timpaired
Trang 6W her ep s ible, t he breakawaycable orse o dary
co plngatt achmentp int (s) sh uldn tbe mor e
t han10 mm fromaver t ical pla e passingt hr ough
t helo gitu inal c nt r elne oft he vehicle Ifthis is
n tp s ible, t henitis es ent ialt hatt woat tachment
p intsar e pr ovided,eq idistantfr om the vehicle
c ntrelnea dn mor et han2 0mm from the
vehiclec ntrelne
Thebr eakawaycableorse o dar yco plng
at t achmentp int (s) sh uldbep sitio ed asfar
rear wardand ashighasp s ible andpr acticable
5.6 Ph sical characteristic
W hent he br eakawayca le orse o dar yco plng is
at t acheddir ectlyt o t hetowbar , the at tachmentlo p,
h le, ey eletorsimiarsh uldbe suficient ly lar geto
alowar igid sp ereofat least10mm diamet ert o
pass freelyt hr oughit
5.7 Strength
Thebr eakawaycableorse o dar yco plng
at t achmentp intsh uldbe able t owithstandastatic
loadof2Dfor 0s, a pledalo g alne passing
t hr ought hec ntre oft he att achmentp into a
planeparallel t ot he lo gitu inal c nt r e lne oft he
vehicleandinclnedd wnwar ds t ot he rear at15°
( e F igur e1),with utdet achmentorincurr inga
dist or t io ofdeformat io th tco ld afe tthe safe
o erat io oft he breakawaycable orse o dary
co plng(wher eD is definedin
EC Directive9 /2 a dlmit edt o amaximumtrailer
mass of 5 0kg)
Figure 1 ± Direction of test lo d
a pl cation
6 General
6.1 Bre kawa ca les
Thebr eakawaycable sh uldpassthroughalug,
guide orsimiarfit t ingo the trailer, t oensur e that ,
regardles oft he r elat ive angles oft he t r ailera d
t owingvehicle atthet imeofseparat io oft hemain
co plng, t hereis adirect,inlne, p l appled t othe
brake ln ageofthet r ailer
6.2 Brake mech nism protection
Ifne es ar yaskid, orot hersuitable means of
pr ot ect io sh uld be pr ovidedt oensur e that the
br ake o er atingme hanismd esn tfo lt he gr ou d
in t heeventofsepar at io ofthe main co plng
7 Trai er documentation
Clearinst r uctio s a d diagr ams sh wingthe
at t achmentofthebr eakawayca leorse o dar y
co plng sh uldbeinclu edin the t r ailerhand o k
Thetrailerhand o ksh uldalsospe ify det ailsof
t he rat inga ddimensio s forspare breakaway
ca les andse o daryco plngs
These o dar yco plng orbr eakawaycable
at t achmentp int (s) sh uldbe ident ified o t he
d cument atio su pledfort he t owbarinst allatio
ando er atio
Thetrailerd cumentatio sh uld in icatethatdirect
att achmentis t he preferredmet ho ofatt achment
b tifthe cable is tobe lo pedar ou dthe t owing
b l t henitises ent ial t hatt heuserensurest hatit is
se ur eand wi o er at e corr ectly
Trang 7b
Trang 83 9Ch isw i ckH i g hR oa
Lon don
W44 AL
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