{"id":3033,"date":"2025-01-22T14:42:54","date_gmt":"2025-01-22T20:42:54","guid":{"rendered":"https:\/\/3.212.105.250\/?p=3033"},"modified":"2025-07-26T16:10:51","modified_gmt":"2025-07-26T22:10:51","slug":"rozdily-mezi-zemnim-zkratem-a-zkratem","status":"publish","type":"post","link":"https:\/\/vm6fr4whzn6.c.updraftclone.com\/cs\/2025\/01\/22\/rozdily-mezi-zemnim-zkratem-a-zkratem\/","title":{"rendered":"Zemn\u00ed poruchy vs. zkraty: Rozd\u00edl a jak p\u0159edch\u00e1zet rizikov\u00fdm probl\u00e9m\u016fm"},"content":{"rendered":"<p>Poruchy elektrick\u00e9ho proudu mohou p\u0159edstavovat v\u00fdznamn\u00e9 riziko pro lidi i majetek, zde se zab\u00fdv\u00e1me zemn\u00edmi poruchami a zkraty. Dva b\u011b\u017en\u00e9 typy elektrick\u00fdch poruch jsou zemn\u00ed poruchy a zkraty. Pochopen\u00ed rozd\u00edl\u016f mezi t\u011bmito poruchami a zp\u016fsob\u016f, jak jim p\u0159edch\u00e1zet, je z\u00e1sadn\u00ed pro zachov\u00e1n\u00ed bezpe\u010dn\u00e9ho elektrick\u00e9ho syst\u00e9mu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Co je to zemn\u00ed porucha?<\/h2>\n\n\n\n<p>Zemn\u00ed porucha je typ elektrick\u00e9 poruchy, kter\u00e1 vznik\u00e1, kdy\u017e elektrick\u00fd proud unikne ze zam\u00fd\u0161len\u00e9 cesty a te\u010de do zem\u011b necht\u011bn\u00fdm vodi\u010dem. K tomu m\u016f\u017ee doj\u00edt, kdy\u017e je elektrick\u00fd vodi\u010d po\u0161kozen\u00fd, obna\u017een\u00fd nebo mokr\u00fd a dostane se do kontaktu s kovov\u00fdm p\u0159edm\u011btem, osobou nebo zem\u00ed. Zemn\u00ed porucha m\u016f\u017ee zp\u016fsobit \u00faraz elektrick\u00fdm proudem, po\u017e\u00e1r nebo po\u0161kozen\u00ed elektrick\u00e9ho syst\u00e9mu. Za\u0159\u00edzen\u00ed, jako jsou zemn\u00ed jisti\u010de (GFCI), jsou navr\u017eena tak, aby detekovala zemn\u00ed poruchu a vypnula nap\u00e1jen\u00ed, aby se zabr\u00e1nilo \u0161kod\u00e1m.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Co je zkrat?<\/h2>\n\n\n\n<p>Zkrat, zn\u00e1m\u00fd tak\u00e9 jako zkrat na zem, je dal\u0161\u00edm typem elektrick\u00e9 poruchy, ke kter\u00e9 doch\u00e1z\u00ed, kdy\u017e elektrick\u00fd proud obejde svou zam\u00fd\u0161lenou cestu a te\u010de p\u0159\u00edmo ke zdroji energie. K tomu m\u016f\u017ee doj\u00edt, kdy\u017e se dva vodi\u010de vz\u00e1jemn\u011b dotknou, \u010d\u00edm\u017e vznikne n\u00edzkoodporov\u00e1 cesta pro proud. Zkrat m\u016f\u017ee zp\u016fsobit jisk\u0159en\u00ed, po\u017e\u00e1r nebo po\u0161kozen\u00ed elektrick\u00e9ho syst\u00e9mu. Pochopen\u00ed definice zkratu je nezbytn\u00e9 pro v\u010dasnou identifikaci a \u0159e\u0161en\u00ed t\u011bchto probl\u00e9m\u016f.<\/p>\n\n\n<video src=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/wp-content\/uploads\/2025\/01\/Short-Circuit-PC-Power-Supply.webm\" controls autoplay loop><\/video>\n\n\n<h2 class=\"wp-block-heading\">Jak\u00fd je rozd\u00edl mezi zemn\u00edm zkratem a zkratem?<\/h2>\n\n\n\n<p>Hlavn\u00ed rozd\u00edl mezi zemn\u00ed poruchou a zkratem spo\u010d\u00edv\u00e1 ve sm\u011bru toku proudu. P\u0159i zemn\u00ed poru\u0161e te\u010de proud do zem\u011b, zat\u00edmco p\u0159i zkratu te\u010de proud zp\u011bt ke zdroji energie. Dal\u0161\u00edm rozd\u00edlem je potenci\u00e1ln\u00ed nebezpe\u010dnost jednotliv\u00fdch poruch. Zemn\u00ed porucha m\u016f\u017ee b\u00fdt nebezpe\u010dn\u011bj\u0161\u00ed pro lidi a zv\u00ed\u0159ata, proto\u017ee se mohou st\u00e1t sou\u010d\u00e1st\u00ed proudov\u00e9 dr\u00e1hy a dostat \u00faraz elektrick\u00fdm proudem. Zkrat m\u016f\u017ee b\u00fdt nebezpe\u010dn\u011bj\u0161\u00ed <a href='https:\/\/vm6fr4whzn6.c.updraftclone.com\/cs\/2022\/06\/17\/bezna-elektricka-nebezpeci-na-pracovisti\/'>nebezpe\u010dn\u00e9 pro elektrick\u00fd proud<\/a> syst\u00e9mu, proto\u017ee m\u016f\u017ee vytv\u00e1\u0159et velk\u00e9 mno\u017estv\u00ed tepla a zp\u016fsobit po\u017e\u00e1r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Jak zabr\u00e1nit zemn\u00edm poruch\u00e1m a zkrat\u016fm?<\/h2>\n\n\n\n<p>Nejlep\u0161\u00edm zp\u016fsobem, jak zabr\u00e1nit zemn\u00edm poruch\u00e1m a zkrat\u016fm, je spr\u00e1vn\u00e1 instalace a \u00fadr\u017eba elektrick\u00fdch rozvod\u016f a za\u0159\u00edzen\u00ed. N\u011bkter\u00e1 za\u0159\u00edzen\u00ed, kter\u00e1 mohou pomoci zabr\u00e1nit t\u011bmto poruch\u00e1m, jsou:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>P\u0159eru\u0161ova\u010de zemn\u00edho spojen\u00ed (GFCI):<\/strong>\u00a0Jedn\u00e1 se o za\u0159\u00edzen\u00ed, kter\u00e1 detekuj\u00ed zemn\u00ed poruchy a vypnou nap\u00e1jen\u00ed posti\u017een\u00e9ho obvodu. Obvykle se instaluj\u00ed do z\u00e1suvek nebo jisti\u010d\u016f, kter\u00e9 jsou v bl\u00edzkosti zdroj\u016f vody, jako jsou koupelny, kuchyn\u011b, pr\u00e1delny, gar\u00e1\u017ee a venkovn\u00ed prostory. GFCI maj\u00ed testovac\u00ed a resetovac\u00ed tla\u010d\u00edtka, kter\u00e1 umo\u017e\u0148uj\u00ed zkontrolovat jejich funk\u010dnost a obnovit nap\u00e1jen\u00ed, pokud dojde k jejich vypnut\u00ed.<\/li>\n\n\n\n<li><strong>Obloukov\u00e9 p\u0159eru\u0161ova\u010de (AFCI):<\/strong>\u00a0Jedn\u00e1 se o za\u0159\u00edzen\u00ed, kter\u00e1 detekuj\u00ed obloukov\u00e9 poruchy, co\u017e jsou jiskry nebo z\u00e1blesky, kter\u00e9 vznikaj\u00ed p\u0159i po\u0161kozen\u00ed nebo uvoln\u011bn\u00ed vodi\u010d\u016f. Obloukov\u00e9 poruchy mohou zp\u016fsobit zemn\u00ed poruchy nebo zkraty a tak\u00e9 po\u017e\u00e1ry. Za\u0159\u00edzen\u00ed AFCI se obvykle instaluj\u00ed do jisti\u010d\u016f, kter\u00e9 chr\u00e1n\u00ed elektroinstalaci v lo\u017enic\u00edch, ob\u00fdvac\u00edch pokoj\u00edch, j\u00eddeln\u00e1ch a dal\u0161\u00edch prostor\u00e1ch, kde je pravd\u011bpodobn\u00fd v\u00fdskyt obloukov\u00fdch poruch. AFCI maj\u00ed testovac\u00ed a resetovac\u00ed tla\u010d\u00edtka, kter\u00e1 umo\u017e\u0148uj\u00ed zkontrolovat jejich funk\u010dnost a obnovit nap\u00e1jen\u00ed v p\u0159\u00edpad\u011b jejich vypnut\u00ed.<\/li>\n\n\n\n<li><strong>Z\u00e1suvky GFCI:<\/strong>\u00a0Jedn\u00e1 se o z\u00e1suvky, kter\u00e9 maj\u00ed zabudovan\u00e9 GFCI. Pou\u017e\u00edvaj\u00ed se jako n\u00e1hrada standardn\u00edch z\u00e1suvek v m\u00edstech, kde jsou GFCI vy\u017eadov\u00e1ny nebo doporu\u010dov\u00e1ny. Maj\u00ed tla\u010d\u00edtka test a reset, kter\u00e1 umo\u017e\u0148uj\u00ed zkontrolovat jejich funk\u010dnost a obnovit nap\u00e1jen\u00ed, pokud dojde k jejich vypnut\u00ed.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Jak funguj\u00ed GFCI?<\/h3>\n\n\n\n<p>GFCI monitoruje tok elekt\u0159iny v obvodu a porovn\u00e1v\u00e1 mno\u017estv\u00ed proudu p\u0159ich\u00e1zej\u00edc\u00edho a vracej\u00edc\u00edho se ze spot\u0159ebi\u010de nebo za\u0159\u00edzen\u00ed. Za norm\u00e1ln\u00edch podm\u00ednek by m\u011bl b\u00fdt proud vyrovnan\u00fd a stejn\u00fd. Pokud v\u0161ak dojde k zemn\u00ed poru\u0161e, nap\u0159\u00edklad kdy\u017e se rozt\u0159epen\u00fd vodi\u010d dotkne kovov\u00e9ho p\u0159edm\u011btu nebo kdy\u017e se \u010dlov\u011bk dostane do kontaktu s vodi\u010dem pod nap\u011bt\u00edm, \u010d\u00e1st proudu unikne z obvodu a vyd\u00e1 se alternativn\u00ed cestou do zem\u011b. T\u00edm vznikne nerovnov\u00e1ha v toku proudu, kterou GFCI detekuje a reaguje na ni.<\/p>\n\n\n\n<p>Kdy\u017e GFCI zjist\u00ed zemn\u00ed poruchu, rychle p\u0159eru\u0161\u00ed nap\u00e1jen\u00ed obvodu a zabr\u00e1n\u00ed tak \u00farazu elektrick\u00fdm proudem, po\u017e\u00e1ru nebo po\u0161kozen\u00ed za\u0159\u00edzen\u00ed. GFCI m\u016f\u017ee reagovat ji\u017e za 1\/40 sekundy, tedy rychleji ne\u017e mrknut\u00edm oka. GFCI nechr\u00e1n\u00ed p\u0159ed p\u0159et\u00ed\u017een\u00edm, zkratem nebo \u00farazem elektrick\u00fdm proudem, ke kter\u00e9mu doch\u00e1z\u00ed mezi hork\u00fdm a nulov\u00fdm vodi\u010dem, co\u017e \u0159e\u0161\u00ed pojistky nebo jisti\u010de. GFCI chr\u00e1n\u00ed pouze p\u0159ed ot\u0159esy, ke kter\u00fdm doch\u00e1z\u00ed mezi hork\u00fdm vodi\u010dem a zem\u00ed nebo mezi nulov\u00fdm vodi\u010dem a zem\u00ed.<\/p>\n\n\n\n<p>Abyste se ujistili, \u017ee GFCI funguje spr\u00e1vn\u011b, doporu\u010dujeme jej ka\u017ed\u00fd m\u011bs\u00edc otestovat podle n\u00e1sleduj\u00edc\u00edch krok\u016f:<\/p>\n\n\n\n<p>- Zapojte lampu nebo jin\u00e9 za\u0159\u00edzen\u00ed do z\u00e1suvky GFCI a zapn\u011bte ji.<\/p>\n\n\n\n<p>- Stiskn\u011bte testovac\u00ed tla\u010d\u00edtko na z\u00e1suvce GFCI. M\u011blo by doj\u00edt k vypnut\u00ed nap\u00e1jen\u00ed a lampa nebo za\u0159\u00edzen\u00ed by se m\u011bly vypnout.<\/p>\n\n\n\n<p>- Stiskn\u011bte resetovac\u00ed tla\u010d\u00edtko na z\u00e1suvce GFCI. Nap\u00e1jen\u00ed by se m\u011blo obnovit a lampa nebo za\u0159\u00edzen\u00ed by se m\u011bly zapnout.<\/p>\n\n\n\n<p>- Pokud GFCI nereaguje podle popisu, m\u016f\u017ee b\u00fdt vadn\u00fd a m\u011bl by ho vym\u011bnit kvalifikovan\u00fd elektrik\u00e1\u0159.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Jak funguje AFCI?<\/h3>\n\n\n\n<p>- Na rozd\u00edl od GFCI, kter\u00e9 <a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/cs\/2020\/10\/30\/jak-chranit-pracovniky-pred-obloukovym-zableskem\/\">chr\u00e1n\u00ed p\u0159ed zemn\u00edmi poruchami, AFCI chr\u00e1n\u00ed p\u0159ed obloukem.<\/a> poruchy, co\u017e jsou jiskry nebo z\u00e1blesky, kter\u00e9 vznikaj\u00ed p\u0159i po\u0161kozen\u00ed, rozt\u0159epen\u00ed, uvoln\u011bn\u00ed nebo p\u0159eh\u0159\u00e1t\u00ed elektrick\u00fdch vodi\u010d\u016f nebo kabel\u016f. Obloukov\u00e9 poruchy mohou zp\u016fsobit po\u017e\u00e1ry a \u00farazy elektrick\u00fdm proudem t\u00edm, \u017ee zap\u00e1l\u00ed bl\u00edzk\u00e9 materi\u00e1ly nebo vytvo\u0159\u00ed cestu k osob\u011b, kter\u00e1 se dotkne kovov\u00e9ho p\u0159edm\u011btu.<\/p>\n\n\n\n<p>- Svodi\u010de AFCI funguj\u00ed na z\u00e1klad\u011b detekce charakteristick\u00fdch vzorc\u016f proudu a nap\u011bt\u00ed, kter\u00e9 indikuj\u00ed obloukovou poruchu. Neust\u00e1le monitoruj\u00ed elektrick\u00fd obvod a porovn\u00e1vaj\u00ed jej s norm\u00e1ln\u00edm pr\u016fb\u011bhem. Pokud zjist\u00ed abnormalitu, nap\u0159\u00edklad n\u00e1hl\u00fd n\u00e1r\u016fst nebo pokles proudu \u010di nap\u011bt\u00ed nebo vysokofrekven\u010dn\u00ed \u0161um, p\u0159eru\u0161\u00ed nap\u00e1jen\u00ed a zabr\u00e1n\u00ed pokra\u010dov\u00e1n\u00ed obloukov\u00e9 poruchy.<\/p>\n\n\n\n<p>- AFCI mohou b\u00fdt instalov\u00e1ny jako jisti\u010de v hlavn\u00edm servisn\u00edm panelu nebo jako z\u00e1suvky v z\u00e1suvk\u00e1ch. Jsou <a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/cs\/2024\/04\/02\/tri-spolecne-problemy-komplexniho-navrhu-katodicke-ochrany\/\">ur\u010den\u00e9 k ochran\u011b<\/a> nejen na z\u00e1suvku, kde jsou instalov\u00e1ny, ale tak\u00e9 na celou odbo\u010dku za t\u00edmto bodem. Podle normy NEC jsou pojistky AFCI vy\u017eadov\u00e1ny na n\u00e1sleduj\u00edc\u00edch m\u00edstech:<\/p>\n\n\n\n<p>V\u0161echny jednof\u00e1zov\u00e9 obvody 120 V, 15 a 20 A, kter\u00e9 nap\u00e1jej\u00ed z\u00e1suvky a za\u0159\u00edzen\u00ed v lo\u017enic\u00edch, ob\u00fdvac\u00edch pokoj\u00edch, j\u00eddeln\u00e1ch, rodinn\u00fdch pokoj\u00edch, salonech, knihovn\u00e1ch, pracovn\u00e1ch, slune\u010dn\u00edch m\u00edstnostech, odpo\u010dinkov\u00fdch m\u00edstnostech, \u0161atn\u00e1ch, chodb\u00e1ch a podobn\u00fdch m\u00edstnostech nebo prostorech.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Kde jsou vy\u017eadov\u00e1ny GFCI a AFCI?<\/h3>\n\n\n\n<p>N\u00e1rodn\u00ed elektrotechnick\u00fd p\u0159edpis (<a href=\"https:\/\/en.wikipedia.org\/wiki\/National_Electrical_Code\" title=\"\">NEC<\/a>) je soubor norem a p\u0159edpis\u016f, kter\u00e9 upravuj\u00ed instalaci a \u00fadr\u017ebu elektrick\u00fdch syst\u00e9m\u016f ve Spojen\u00fdch st\u00e1tech. NEC ur\u010duje, kde jsou vy\u017eadov\u00e1ny nebo doporu\u010dov\u00e1ny GFCI a AFCI, aby se zabr\u00e1nilo zemn\u00edm poruch\u00e1m a zkrat\u016fm. Podle NEC jsou GFCI vy\u017eadov\u00e1ny na n\u00e1sleduj\u00edc\u00edch m\u00edstech pro v\u011bt\u0161inu obytn\u00fdch aplikac\u00ed:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>V\u0161echny jednof\u00e1zov\u00e9 z\u00e1suvky na 125 V, 15 a 20 A instalovan\u00e9 v koupeln\u00e1ch, gar\u00e1\u017e\u00edch, sklepn\u00edch prostor\u00e1ch, nedokon\u010den\u00fdch sklep\u00edch, kuchyn\u00edch, pr\u00e1deln\u00e1ch, mokr\u00fdch barech, lodn\u00edch domech a ve venkovn\u00edm prost\u0159ed\u00ed.<\/li>\n\n\n\n<li>V\u0161echny jednof\u00e1zov\u00e9 z\u00e1suvky 125 V, 15 a 20 A, instalovan\u00e9 do vzd\u00e1lenosti 6 stop od vn\u011bj\u0161\u00edho okraje umyvadla.<\/li>\n\n\n\n<li>V\u0161echny jednof\u00e1zov\u00e9 z\u00e1suvky 125 V, 15 a 20 A instalovan\u00e9 na m\u00edstech, kde nejsou z\u00e1suvky snadno p\u0159\u00edstupn\u00e9 a jsou nap\u00e1jeny z odbo\u010dky ur\u010den\u00e9 pro elektrick\u00e9 za\u0159\u00edzen\u00ed na t\u00e1n\u00ed sn\u011bhu, odmrazov\u00e1n\u00ed nebo oh\u0159ev potrub\u00ed.<\/li>\n<\/ul>\n\n\n\n<p>Podle normy NEC jsou pojistky AFCI vy\u017eadov\u00e1ny v n\u00e1sleduj\u00edc\u00edch obytn\u00fdch lokalit\u00e1ch:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>V\u0161echny jednof\u00e1zov\u00e9, 15- a 20amp\u00e9rov\u00e9 odbo\u010dky na 120 V, kter\u00e9 nap\u00e1jej\u00ed z\u00e1suvky nebo za\u0159\u00edzen\u00ed instalovan\u00e1 v kuchyn\u00edch, rodinn\u00fdch pokoj\u00edch, j\u00eddeln\u00e1ch, ob\u00fdvac\u00edch pokoj\u00edch, salonech, knihovn\u00e1ch, pracovn\u00e1ch, lo\u017enic\u00edch, slune\u010dn\u00edch m\u00edstnostech, odpo\u010dinkov\u00fdch m\u00edstnostech, \u0161atn\u00e1ch, chodb\u00e1ch, pr\u00e1deln\u00e1ch nebo podobn\u00fdch m\u00edstnostech nebo prostorech.<\/li>\n\n\n\n<li>V\u0161echny odbo\u010dky nap\u00e1jej\u00edc\u00ed jednof\u00e1zov\u00e9 z\u00e1suvky nebo za\u0159\u00edzen\u00ed s nap\u011bt\u00edm 120 V, 15 a 20 A, instalovan\u00e9 v ubytovac\u00edch jednotk\u00e1ch.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Pora\u010fte se s in\u017een\u00fdrem<\/h2>\n\n\n\n<p>Zemn\u00ed poruchy a <a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/cs\/2020\/03\/23\/priciny-a-nasledky-zkratu\/\">zkraty<\/a> jsou b\u011b\u017en\u00e9 typy elektrick\u00fdch z\u00e1vad, kter\u00e9 mohou zp\u016fsobit \u00faraz elektrick\u00fdm proudem, po\u017e\u00e1r a po\u0161kozen\u00ed elektrick\u00e9ho syst\u00e9mu. Lze jim p\u0159edch\u00e1zet instalac\u00ed a \u00fadr\u017ebou spr\u00e1vn\u00fdch elektrick\u00fdch rozvod\u016f a za\u0159\u00edzen\u00ed, jako jsou GFCI a AFCI. Norma NEC uv\u00e1d\u00ed pokyny, kde jsou tato za\u0159\u00edzen\u00ed vy\u017eadov\u00e1na nebo doporu\u010dov\u00e1na, aby byla zaji\u0161t\u011bna bezpe\u010dnost a shoda s p\u0159edpisy. Dodr\u017eov\u00e1n\u00edm t\u011bchto pokyn\u016f m\u016f\u017eete chr\u00e1nit sebe, svou rodinu a sv\u016fj majetek p\u0159ed nebezpe\u010d\u00edm zemn\u00edch poruch a <a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/cs\/poradenske-oblasti\/elektricka-energie\/analyza-zkratu\/\">zkraty<\/a>. Abyste si byli jisti, \u017ee jste svou instalaci ochr\u00e1nili, m\u011bli byste se v\u017edy poradit s odborn\u00edkem. <a href=\"https:\/\/vm6fr4whzn6.c.updraftclone.com\/cs\/poradenske-oblasti\/elektricka-energie\/\" title=\"\">licencovan\u00fd in\u017een\u00fdr<\/a>.<\/p>\n\n\n\n<p><\/p>","protected":false},"excerpt":{"rendered":"<p>Electrical faults can pose significant risks to both people and property, here we investigate ground faults vs short circuits. Two common types of electrical faults are ground faults and short circuits. Understanding the differences between these faults and how to prevent them is crucial for maintaining a safe electrical system. What is a Ground Fault? [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":3459,"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":1529,"footnotes":""},"categories":[4],"tags":[],"class_list":["post-3033","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electrical"],"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=\"Electrical faults can pose significant risks to both people and property, here we investigate ground faults vs short circuits. 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