Fea t u re– C a ble Ladders a n d T ra ys Volume3 I s sue3 20 0 6 Hot DipGal vani zi ng T oda y37 Desi gnandspeci fi cati on ofa cabl esupports y stem Thespecificationofcablesupport s y stemsgener all y fallsunder the jur isdictionoftheelectr icalor instr umentationengineer , duetothe factthathecontr olsthecabling . Asa w elldesignedcablesuppor ts y stem r equir esex per tiseinstr uctur aland cor r osionengineer ing , itisnecessar y for thespecialistsupplier ofcable supports y stemstooffer technical supportinthesear eastoensur ethat their pr oductsarecor r ectl y specifiedfor eachpar ticular application. S upplier sofcablesuppor ts y stems offer themar k etawider angeofpr oductswithvar y ingcablecar r y ing capabilities, manufactur edinman y mater ialsandfinishes(e. g . gr aded stainlesssteels, 3C R12, aluminium, fibr er einfor cedplastic , hotdip galvanizedmildsteel, duplexcoated hotdipgalvanizedmildsteeland industr ialpaints y stemsonmild steel ) , tocater for ever yt y peofcor r osiveenvi r onmentimaginable. Webelievethat, asther ear e‘horsesforcourses’, similar l y thisr angeofpr oducts enablesthedesigner toselectthebest optionthatwillsatisfy aspecificsetofstr uctur alandenv i r onmentaldesign r equir ementsfor thelifeoftheplant. Structural desi g nconsi derati ons foracabl esupports ystem R eputablesupplier sofcablesuppor t s y stemsshouldbeabletopr edictthe loadcar r y ingcapabilit y / per for manceofeachoftheir pr oductsatdifferent supportspansinor der torecommend themostsuitablepr oductfor a par ticular use. Inor der todothis, all cablecar r yingpr oductsshouldbe designedandcategor isedinaccor dance w ithlocalandinter nationalstandar ds. Ther ealchallengeinthedesignofa cablesupports y stemliesinthe industr ialmar k et , w her ecablesoften hav etospanlongdistanceswithout inter mediatesuppor ts. Thedesignalso dependsonthepr efer enceofthe electr icalengineer tosuppor tthecables b y la y ingthemonahor iz ontalcable ladder / tr a y (bed ) , or tiethemtoanedge mountedcableladder / tr a y (wall ). B ecauseS outhAfr icanengineer s gener all y pr efer thelatter methodofsuppor tingcables, acableladder was locall y dev elopedsomeeighteeny ear s ago, whichisstr uctur all y superior w hen car r y ingdesigncableloadsover long spanswhenmountedonitsedge. This pr oducthasallbutr eplacedtheuseofangleandflatbar cableladdersin miningandheav y industr ial applications. Theoutstandingfeatur es ofthispr oductar efullweldingatthe junctionofeachcr ossr ungw iththe sider ailandex tendedbottomflange, thuscr eatingar igidfix edjoint. In addition, theendofeachcr ossrungis cutback atanangleinor der toallow a gener ousopeningfor z incflowdur ing hotdipgalv aniz ing . Inother par tsofthewor ld, engineer s favour la y ingtheir cablesonacable ladder or tr a y , whichismountedinthe G ZI NC BA THHEA TING G ZI NC BA THS C OM PLETEG TEM PERA TURES ENS ORS G PRE-CLEANINGBA TH HEA TI NG G C ONTROLEQUIPMENT G GAS -ELEC TRI C C ONVERS IONS POBox53483T ro yevi ll e2139 T el: [ 011] 8943937 Fax: [ 011] 8943954www. hi -techel ements . co. zaE mai l: andre @ hi -techel ements . co. za DES I G NERS AND M AN U F AC TURERS O FELEC TRI C AL HEAT I N G ELEM EN TS AN D S YS TEM S hor iz ontalplane. Whenmountedin thispositionover longspans, thecable ladder or tr a y r equir esadeeper siderail pr ofileinor der tosatisfy thedesign loadrequir ements. Thefactthatver y few locall y mar ketedcableladder sor tr a y shavesider ailsor tur nupsgr eater than76mmseemstopr ov em y beliefthatS outhAfr icanspecifier ssuppor t Thec ablet ra yont herig ht ( hot di pg al vanized t oS A NS 12 1) w ill out la s t t het ra yont hel eft (c ont inuous l yhot dipgalvanizedmat erial) by upw ar ds of4 t imes!
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