{"id":4407,"date":"2024-02-29T10:56:01","date_gmt":"2024-02-29T16:56:01","guid":{"rendered":"https:\/\/www.dreiym.com\/?p=4407"},"modified":"2025-07-26T16:11:10","modified_gmt":"2025-07-26T22:11:10","slug":"dokumenteret-lysbuemaerkning-hvad-du-skal-vide","status":"publish","type":"post","link":"https:\/\/vm6fr4whzn6.c.updraftclone.com\/da\/2024\/02\/29\/dokumenteret-lysbuemaerkning-hvad-du-skal-vide\/","title":{"rendered":"Gennempr\u00f8vet lysbue-m\u00e6rkning: Hvad du har brug for at vide"},"content":{"rendered":"<h1 class=\"wp-block-heading\">Hvad er en lysbue?<\/h1>\n\n\n\n<p>En lysbue er en pludselig frigivelse af elektrisk energi, der opst\u00e5r, n\u00e5r en fejl eller kortslutning for\u00e5rsager en lysbue mellem to ledere eller en leder og en jordforbindelse. En lysbue kan generere intens varme, lys, lyd og tryk, som kan skade alle i n\u00e6rheden.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hvor varm kan en lysbue blive?<\/h2>\n\n\n\n<p>En lysbue kan n\u00e5 temperaturer p\u00e5 op til 35.000 grader Fahrenheit, hvilket er varmere end solens overflade. Denne ekstreme varme kan ant\u00e6nde t\u00f8j, smelte metal og for\u00e5rsage alvorlige forbr\u00e6ndinger p\u00e5 hud og \u00f8jne.<\/p>\n\n\n\n<p>Varmen fra en lysbue kan udg\u00f8re en alvorlig risiko for mennesker, selv om de ikke er direkte udsat for lysbuen. Str\u00e5levarmen kan for\u00e5rsage anden- eller tredjegradsforbr\u00e6ndinger p\u00e5 enhver udsat hud inden for flere meters afstand af lysbuen. Varmen kan ogs\u00e5 ant\u00e6nde br\u00e6ndbare materialer som t\u00f8j, h\u00e5r eller papir og for\u00e5rsage mere alvorlige skader. Desuden kan den intense varme skade \u00e5ndedr\u00e6tsorganerne og for\u00e5rsage ind\u00e5ndingsskader, is\u00e6r hvis der er r\u00f8g eller giftige gasser til stede. Derfor er det vigtigt at b\u00e6re passende personlige <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/da\/2025\/07\/25\/beskyt-dit-hjem-vigtigheden-af-elektrisk-jordforbindelse-og-potentialudligning-2\/'>beskyttelsesudstyr (PPE) og undg\u00e5 at arbejde i n\u00e6rheden af str\u00f8mf\u00f8rende elektriske<\/a> udstyr, n\u00e5r det er muligt.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hvad er eksplosionskraften i en lysbue?<\/h2>\n\n\n\n<p>En lysbue kan ogs\u00e5 skabe en kraftig trykb\u00f8lge, der kan sl\u00e5 arbejdere omkuld, slynge genstande gennem rummet og beskadige udstyr og strukturer. Eksplosionskraften kan variere fra et par pund pr. kvadrattomme (psi) til flere tusinde psi, afh\u00e6ngigt af sp\u00e6ndingen, str\u00f8mmen og afstanden fra lysbuen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hvad er risikoen for et menneske ved en lysbue?<\/h2>\n\n\n\n<p>En lysbue kan for\u00e5rsage alvorlige skader og d\u00f8dsfald for arbejdere, der uds\u00e6ttes for den. Nogle af de almindelige virkninger af en lysbue er:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Termiske forbr\u00e6ndinger: Den intense varme fra en lysbue kan for\u00e5rsage dybe og smertefulde forbr\u00e6ndinger, der kan skade hud, muskler, nerver og organer. Forbr\u00e6ndinger kan ogs\u00e5 f\u00f8re til infektioner, ardannelse og vansiring.<\/li>\n\n\n\n<li>\u00d8jenskader: Det skarpe lys fra en lysbue kan for\u00e5rsage midlertidig eller permanent blindhed samt skader p\u00e5 nethinden, hornhinden og linsen. \u00d8jenskader kan ogs\u00e5 forringe synet, for\u00e5rsage lysf\u00f8lsomhed og \u00f8ge risikoen for gr\u00e5 og gr\u00f8n st\u00e6r.<\/li>\n\n\n\n<li>Tab af h\u00f8relse: Den h\u00f8je st\u00f8j fra en lysbue kan spr\u00e6nge trommehinderne, beskadige det indre \u00f8re og for\u00e5rsage midlertidigt eller permanent h\u00f8retab. H\u00f8retab kan ogs\u00e5 p\u00e5virke balancen, kommunikationen og livskvaliteten.<\/li>\n\n\n\n<li>\u00c5ndedr\u00e6tsbesv\u00e6r: R\u00f8gen og gasserne fra en lysbue kan irritere lunger, hals og n\u00e6se og for\u00e5rsage hoste, hv\u00e6sende vejrtr\u00e6kning, \u00e5nden\u00f8d og astma. Nogle af gasserne, f.eks. kulilte, kan ogs\u00e5 v\u00e6re giftige og for\u00e5rsage forgiftning, hjerneskade og d\u00f8d.<\/li>\n\n\n\n<li>Hjertestop: Det elektriske st\u00f8d fra en lysbue kan stoppe hjertet, for\u00e5rsage uregelm\u00e6ssig hjerterytme og beskadige hjertemusklen. Hjertestop kan ogs\u00e5 resultere i hjerneskade, koma og d\u00f8d.<\/li>\n\n\n\n<li>Psykologisk traume: Oplevelsen af en lysbue kan for\u00e5rsage posttraumatisk stresslidelse (PTSD), angst, depression og flashbacks. Psykologiske traumer kan ogs\u00e5 p\u00e5virke hukommelse, koncentration, s\u00f8vn og relationer.<\/li>\n\n\n\n<li>Lungekollaps: Eksplosionskraften fra en lysbue kan skabe en chokb\u00f8lge, der bev\u00e6ger sig hurtigere end lydens hastighed. Denne chokb\u00f8lge kan komprimere luften i lungerne og f\u00e5 dem til at briste eller kollapse. Denne tilstand er kendt som pneumothorax. Lungekollaps kan for\u00e5rsage alvorlige vejrtr\u00e6kningsbesv\u00e6r, brystsmerter, lavt blodtryk og cyanose (bl\u00e5lig hud). Lungekollaps kan ogs\u00e5 v\u00e6re livstruende og kr\u00e6ve akut behandling med et thoraxdr\u00e6n eller operation.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Hvad er kaloriegr\u00e6nser, og hvorfor er de vigtige?<\/h2>\n\n\n\n<p>En kaloriegr\u00e6nse er et m\u00e5l for den m\u00e6ngde varmeenergi, der kan for\u00e5rsage en andengradsforbr\u00e6nding p\u00e5 menneskehud. Den udtrykkes i kalorier pr. kvadratcentimeter (cal\/cm<sup>2<\/sup>). En andengradsforbr\u00e6nding er en forbr\u00e6nding, der beskadiger de ydre og indre lag af huden og for\u00e5rsager bl\u00e6rer, smerte og h\u00e6velse.<\/p>\n\n\n\n<p>Kaloriegr\u00e6nser er vigtige, fordi de er med til at bestemme det beskyttelsesniveau, som arbejdere skal b\u00e6re, n\u00e5r de arbejder i n\u00e6rheden af elektrisk udstyr, der kan for\u00e5rsage en lysbue. Beskyttelsesniveauet er ogs\u00e5 kendt som arc flash protection boundary (AFPB) eller arc flash hazard boundary (AFHB).<\/p>\n\n\n\n<p>AFPB eller AFHB er den afstand fra lysbuekilden, hvor den indfaldende energi er lig med eller mindre end en bestemt kaloriegr\u00e6nse. Jo lavere kaloriegr\u00e6nsen er, jo t\u00e6ttere er gr\u00e6nsen, og jo h\u00f8jere beskyttelsesniveau kr\u00e6ves der. Jo h\u00f8jere kaloriegr\u00e6nse, jo l\u00e6ngere v\u00e6k er gr\u00e6nsen, og jo lavere beskyttelsesniveau kr\u00e6ves der.<\/p>\n\n\n\n<p>En af de mest udbredte kaloriegr\u00e6nser er 1,2 cal\/cm^2, som er baseret p\u00e5 National Fire Protection Association (NFPA) 70E-standarden for <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/da\/2022\/06\/17\/almindelige-elektriske-farer-pa-arbejdspladsen\/'>Elektrisk sikkerhed p\u00e5 arbejdspladsen<\/a>. NFPA 70E siger, at arbejdere skal b\u00e6re lysbueklassificeret t\u00f8j og personlige v\u00e6rnemidler (PPE), der kan modst\u00e5 mindst 1,2 cal\/cm^2 h\u00e6ndelsesenergi, n\u00e5r de arbejder inden for AFPB eller AFHB.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hvordan m\u00e6rker man elektrisk udstyr for lysbuefarer?<\/h2>\n\n\n\n<p>En af de bedste m\u00e5der at forebygge lysbueskader og d\u00f8dsfald p\u00e5 er at m\u00e6rke elektrisk udstyr med oplysninger om lysbuefarer og det p\u00e5kr\u00e6vede beskyttelsesniveau. M\u00e6rkning af elektrisk udstyr kan hj\u00e6lpe medarbejderne med at identificere de potentielle risici, f\u00f8lge de sikre arbejdsmetoder og b\u00e6re det rette personlige beskyttelsesudstyr.<\/p>\n\n\n\n<p>I henhold til NFPA 70E skal lysbuem\u00e6rkater indeholde f\u00f8lgende oplysninger:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Nominel systemsp\u00e6nding<\/li>\n\n\n\n<li>Gr\u00e6nse for lysbue<\/li>\n\n\n\n<li>Mindst et af f\u00f8lgende:<\/li>\n\n\n\n<li>Tilg\u00e6ngelig indfaldende energi og den tilsvarende arbejdsafstand<\/li>\n\n\n\n<li>Minimum lysbuev\u00e6rdi for bekl\u00e6dning<\/li>\n\n\n\n<li>N\u00f8dvendigt niveau af personlige v\u00e6rnemidler<\/li>\n\n\n\n<li>H\u00f8jeste fare\/risikokategori (HRC) for udstyret<\/li>\n<\/ul>\n\n\n\n<p>Lysbuem\u00e6rkninger kan oprettes ved hj\u00e6lp af software, regnemaskiner eller tabeller, der estimerer lysbueparametrene baseret p\u00e5 det elektriske systems egenskaber, s\u00e5som sp\u00e6nding, str\u00f8m, fejlretningstid og udstyrskonfiguration. Lysbue <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/da\/2021\/09\/20\/oplysninger-der-bor-fremga-af-en-lysbueundersogelsesrapport\/'>Flash-labels kan ogs\u00e5 tilpasses med yderligere oplysninger,<\/a> s\u00e5som dato, sted og advarselsskilte.<\/p>\n\n\n\n<p>Lysbuem\u00e6rkater skal anbringes p\u00e5 alt elektrisk udstyr, der sandsynligvis skal unders\u00f8ges, justeres, serviceres eller vedligeholdes, mens det er str\u00f8mf\u00f8rende, f.eks. tavler, kontrolpaneler, m\u00e5lerudtag og motorstyringscentraler. Lysbueetiketter skal v\u00e6re klart synlige, holdbare og opdateres efter behov.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hvordan beregner man lysbuefarer?<\/h2>\n\n\n\n<p>For at udf\u00f8re en <a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/da\/konsulentomrader\/elektrisk-kraft\/undersogelser-af-lysbuer\/\" title=\"\">teknisk beregning<\/a> ved hj\u00e6lp af ETAP eller SKM, skal f\u00f8lgende oplysninger indsamles i marken:<\/p>\n\n\n\n<p>- Det elektriske udstyrs og afbrydernes type, model og m\u00e6rkev\u00e6rdi.<\/p>\n\n\n\n<p>- Ledernes l\u00e6ngde, st\u00f8rrelse og materiale<\/p>\n\n\n\n<p>- Transformatorernes type og placering og deres impedansv\u00e6rdier<\/p>\n\n\n\n<p>- Kildesp\u00e6ndingen og fejlstr\u00f8mmen ved serviceindgangen<\/p>\n\n\n\n<p>- Den <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/da\/2025\/02\/17\/skjulte-udgifter-fra-darlig-stromkvalitet-forhindrer-spaendingsfald-og-overspaending-med-elektrisk-belastningsanalyse\/'>belastningskarakteristika og effekt<\/a> faktor for de tilsluttede enheder<\/p>\n\n\n<video src=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2024\/02\/Engineer-collecting-Breaker-Settings.webm\" controls autoplay loop><\/video>\n\n\n<p>Ved hj\u00e6lp af disse oplysninger kan softwaren simulere det elektriske system og beregne den indfaldende energi, lysbuegr\u00e6nsen og arbejdsafstanden for hvert udstyr. Softwaren kan ogs\u00e5 generere lysbuem\u00e6rkater baseret p\u00e5 de beregnede v\u00e6rdier.<\/p>\n\n\n\n<p>Kravet om korrekt koordinering af maksimalafbryderne er at sikre, at beskyttelsesanordningerne fungerer selektivt og kun isolerer den defekte del af systemet, mens kontinuiteten i forsyningen til resten af systemet opretholdes. Koordinering af afbryderne kan opn\u00e5s ved at justere deres udl\u00f8sningsindstillinger, s\u00e5som langtid, korttid, \u00f8jeblikkelig og jordfejl, i henhold til deres tids-str\u00f8mkurver.<\/p>\n\n\n\n<p>M\u00e5let med at reducere lysbuetiderne ved at fange lysbuefejlen i den n\u00e6rmeste afbryders \u00f8jeblikkelige udl\u00f8sningsomr\u00e5de er at minimere arbejdstagernes og udstyrets eksponering for lysbuens farlige virkninger, s\u00e5som h\u00f8j temperatur, tryk, lyd og lys. Indfangning af lysbuefejlen i det \u00f8jeblikkelige udl\u00f8sningsomr\u00e5de betyder, at afbryderen vil fjerne fejlen s\u00e5 hurtigt som muligt uden nogen fors\u00e6tlig forsinkelse, og dermed <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/da\/2020\/09\/08\/mader-at-reducere-lysbuehaendelser-pa\/'>reducere varigheden og omfanget af lysbuen<\/a>. Dette kan g\u00f8res ved at indstille afbryderens \u00f8jeblikkelige udl\u00f8sningsv\u00e6rdi til under den forventede lysbuestr\u00f8m for udstyret.<\/p>\n\n\n\n<p>En anden metode til at estimere lysbuefaren er at bruge tabellerne i NFPA 70E-standarden, som angiver lysbuegr\u00e6nsen og kravene til personlige v\u00e6rnemidler (PPE) for forskellige typer elektrisk udstyr baseret p\u00e5 deres nominelle sp\u00e6nding, fejlstr\u00f8m og slukningstid. Tabellerne er beregnet til at forenkle lysbueanalysen og give et konservativt sk\u00f8n over fareniveauet.<\/p>\n\n\n\n<p>- Udstyret skal v\u00e6re korrekt installeret og vedligeholdt i henhold til producentens specifikationer og branchestandarder.<\/p>\n\n\n\n<p>- Udstyret skal have en boltet fejlstr\u00f8m inden for det omr\u00e5de, der er angivet i tabellen.<\/p>\n\n\n\n<p>- Afbryderen skal have en samlet udkoblingstid p\u00e5 2 cyklusser eller mindre for sp\u00e6ndinger under 1 kV, eller 6 cyklusser eller mindre for sp\u00e6ndinger mellem 1 kV og 15 kV.<\/p>\n\n\n\n<p>- Afbryderen skal have en \u00f8jeblikkelig udl\u00f8sningsfunktion eller en energireducerende vedligeholdelseskoblingsanordning.<\/p>\n\n\n\n<p>- Udstyret m\u00e5 ikke have nogen historik med lysbuefejl eller h\u00e6ndelser.<\/p>\n\n\n\n<p>Hvis nogen af disse betingelser ikke er opfyldt, b\u00f8r tabellerne ikke bruges, og der b\u00f8r foretages en detaljeret beregning ved hj\u00e6lp af de metoder, der er beskrevet i <a href=\"https:\/\/en.wikipedia.org\/wiki\/IEEE_1584\" title=\"\">IEEE 1584-standard<\/a>. IEEE 1584-standarden indeholder ligninger og modeller til beregning af den indfaldende energi og lysbuegr\u00e6nsen for forskellige typer udstyr under hensyntagen til forskellige faktorer som afstanden mellem lederne, kabinettets st\u00f8rrelse, arbejdsafstanden og elektrodekonfigurationen.<\/p>\n\n\n\n<p>Beregningsmetoderne i IEEE 1584 er mere pr\u00e6cise og fleksible end tabellerne i <a href=\"https:\/\/en.wikipedia.org\/wiki\/NFPA_70E\" title=\"\">NFPA 70<\/a>E, men de kr\u00e6ver ogs\u00e5 flere data og mere ekspertise at udf\u00f8re. Derfor anbefales det at bruge en kvalificeret professionel elektroingeni\u00f8r til at udf\u00f8re lysbueanalysen og til at verificere resultaterne ved hj\u00e6lp af passende softwarev\u00e6rkt\u00f8jer.<\/p>\n\n\n\n<p>Det er ogs\u00e5 vigtigt at bem\u00e6rke, at b\u00e5de tabellerne og beregningerne er baseret p\u00e5 antagelser og tiln\u00e6rmelser, som m\u00e5ske ikke afspejler de faktiske forhold i det elektriske system p\u00e5 tidspunktet for en lysbueh\u00e6ndelse. Derfor b\u00f8r vurderingen af lysbuefare opdateres med j\u00e6vne mellemrum (senest hvert 5. \u00e5r), is\u00e6r n\u00e5r der sker \u00e6ndringer i systemets konfiguration, belastning eller beskyttelsesindstillinger. Den seneste udgave af IEEE 1584-standarden, der blev udgivet i 2018, indeholder ny forskning og data om lysbuef\u00e6nomener og reviderede ligninger og modeller, der forbedrer n\u00f8jagtigheden og gyldigheden af lysbueberegningerne. Det er tilr\u00e5deligt at bruge de mest aktuelle metoder og standarder for at sikre medarbejdernes og udstyrets sikkerhed mod lysbuefarer.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hvad hvis der allerede er sket en lysbueskade?<\/h2>\n\n\n\n<p>Selvom man tager alle de n\u00f8dvendige forholdsregler og f\u00f8lger standarderne, er der stadig mulighed for, at der opst\u00e5r en lysbueh\u00e6ndelse p\u00e5 grund af uforudsete eller uundg\u00e5elige omst\u00e6ndigheder. I s\u00e5danne tilf\u00e6lde er det vigtigt at handle hurtigt og effektivt for at minimere skaderne og personskaderne for\u00e5rsaget af lysbuen. F\u00f8lgende trin b\u00f8r tages, hvis der allerede er sket en lysbueskade:<\/p>\n\n\n\n<p>- Underret de relevante myndigheder og medarbejdere om h\u00e6ndelsen, og samarbejd med dem. <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/da\/2020\/03\/02\/hovedformalet-med-undersogelse-og-rapportering-af-ulykker\/'>unders\u00f8gelse og rapportering<\/a> proces. F\u00f8lg de etablerede procedurer og protokoller for rapportering og dokumentation af lysbueh\u00e6ndelser p\u00e5 din arbejdsplads.<\/p>\n\n\n\n<p>- Kontakt dreiym engineering s\u00e5 hurtigt som muligt for at f\u00e5 en ekspert i elektroteknik til at vurdere \u00e5rsagen til og konsekvenserne af lysbueh\u00e6ndelsen og til at komme med anbefalinger og l\u00f8sninger, der kan forhindre lignende h\u00e6ndelser i at ske igen. Dreiym Engineering er mere end blot en leverand\u00f8r af lysbueanalyser og konsulentydelser. De er din betroede partner, n\u00e5r det g\u00e6lder om at sikre dit elektriske systems sikkerhed og p\u00e5lidelighed. Med deres team af kvalificerede og erfarne ingeni\u00f8rer kan de hj\u00e6lpe dig med at identificere og eliminere potentielle farer og risici i dine <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/da\/2022\/09\/08\/hvordan-elektroteknisk-praksis-har-udviklet-sig\/'>elektriske system og give dig den bedste praksis<\/a> og l\u00f8sninger til at overholde standarder og regler. Uanset om du har brug for en omfattende lysbueunders\u00f8gelse, en detaljeret analyse af h\u00e6ndelsesenergi eller et tilpasset tr\u00e6ningsprogram,<a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/da\/konsulentomrader\/retsmedicinsk-radgivning\/\" title=\" en retsmedicinsk analyse af en lysbueh\u00e6ndelse\"> en retsmedicinsk analyse af en lysbueh\u00e6ndelse<\/a>eller et p\u00e5lideligt system til afhj\u00e6lpning af lysbuer, kan Dreiym Engineering levere de resultater, du har brug for.<\/p>","protected":false},"excerpt":{"rendered":"<p>What is an arc flash? An arc flash is a sudden release of electrical energy that occurs when a fault or short circuit causes an arc between two conductors or a conductor and a ground. An arc flash can generate intense heat, light, sound, and pressure that can harm anyone nearby. How hot can an [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":4409,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_mbp_gutenberg_autopost":false,"_pgmb_is_evergreen":true,"_pgmb_ap_template_id":0,"iawp_total_views":498,"footnotes":""},"categories":[4,7],"tags":[],"class_list":["post-4407","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical","category-engineering"],"acf":[],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 4.9.6.2 - aioseo.com -->\n\t<meta name=\"description\" content=\"A guide to understanding arc flash hazards and how to protect workers from them with proper arc flash warning labels using NFPA 70E and IEEE 1584.\" \/>\n\t<meta name=\"robots\" content=\"noindex, nofollow, max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Angela Jones\"\/>\n\t<link rel=\"canonical\" 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16:10:56","breadcrumb_settings":null,"limit_modified_date":false,"reviewed_by":null,"open_ai":"{\"title\":{\"suggestions\":[],\"usage\":0},\"description\":{\"suggestions\":[\"Learn about the dangers of arc flashes and how to protect yourself from extreme heat, light, sound, and pressure.\",\"Discover the risks of arc flashes, including thermal burns, eye injuries, hearing loss, and respiratory problems.\",\"Understand the impact of arc flashes on the human body, from cardiac arrest to psychological trauma.\",\"Find out why calorie limits are crucial in determining the level of protection needed near electrical equipment.\",\"Explore the science behind arc flashes, including blast force, calorie limits, and the importance of personal protective equipment.\"],\"usage\":0}}","ai":null,"created":"2024-02-29 16:37:34","updated":"2025-10-21 20:58:25"},"aioseo_breadcrumb":"<div class=\"aioseo-breadcrumbs\"><span class=\"aioseo-breadcrumb\">\n\t<a 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