{"id":790,"date":"2026-08-25T06:34:47","date_gmt":"2026-08-25T04:34:47","guid":{"rendered":"https:\/\/www.mjm-automation.sk\/?p=790"},"modified":"2026-08-25T07:00:06","modified_gmt":"2026-08-25T05:00:06","slug":"pospajanie-equipotential-bonding-ked-mechanika-nestaci","status":"publish","type":"post","link":"https:\/\/www.mjm-automation.sk\/en\/nezaradene\/pospajanie-equipotential-bonding-ked-mechanika-nestaci\/","title":{"rendered":"Posp\u00e1janie (Equipotential bonding): Ke\u010f mechanika nesta\u010d\u00ed"},"content":{"rendered":"

Nazdar chlapi. Tu je v\u00e1\u0161 kolega, \u017eivnostn\u00edk-elektrik\u00e1r. Pre t\u00fdch, \u010do ma e\u0161te nepoznaj\u00fa \u2013 beh\u00e1m po stavb\u00e1ch a priemyseln\u00fdch mont\u00e1\u017each pod kr\u00eddlami MJM-AUTOMATION<\/strong>. Dnes si d\u00e1me na na\u0161om blogu nie\u010do z kateg\u00f3rie „vy\u0161\u0161ia d\u00edv\u010dia“.<\/p>\n\n\n\n

P\u00f4vodne som mohol nap\u00edsa\u0165 klasick\u00fd \u010dl\u00e1nok, ak\u00fdch s\u00fa na nete desiatky. Mohli sme sa bavi\u0165 o tom, ak\u00e9 farby maj\u00fa trubky medici\u00e1lnych plynov, pre\u010do nemocnica potrebuje z\u00e1lo\u017en\u00e9 zdroje, ak\u00e9 d\u00f4le\u017eit\u00e9 s\u00fa kysl\u00edkov\u00e9 alarmy na s\u00e1lach, ako funguj\u00fa z\u00e1kladn\u00e9 reduk\u010dn\u00e9 ventily, alebo ak\u00e9 s\u00fa v\u0161eobecn\u00e9 z\u00e1sady BOZP na stavbe. T\u00fdchto p\u00e4\u0165 otrepan\u00fdch t\u00e9m ale s k\u013eudom presko\u010d\u00edme, lebo to u\u017e d\u00e1vno ovl\u00e1date.<\/p>\n\n\n\n

Po\u010fme sa bavi\u0165 o tom, z \u010doho maj\u00fa re\u0161pekt aj ostrie\u013ean\u00ed borci: Vonkaj\u0161ie stanice na kvapaln\u00fd kysl\u00edk (LOX) v prostred\u00ed ATEX.<\/strong><\/p>\n\n\n\n

Jasn\u00e9, ke\u010f pr\u00eddete na mont\u00e1\u017e vonkaj\u0161ej kryog\u00e9nnej n\u00e1dr\u017ee, rie\u0161ite toho ve\u013ea. \u0164ah\u00e1te k\u00e1ble k atmosf\u00e9rick\u00fdm odparova\u010dom, zap\u00e1jate EX-kov\u00e9 sn\u00edma\u010de tlaku a hladiny, a in\u0161talujete zlo\u017eit\u00e9 syst\u00e9my elektrick\u00e9ho vyhrievania (trace heating). To vyhrievanie je mimochodom super d\u00f4le\u017eit\u00e9, lebo ke\u010f sa kysl\u00edk men\u00ed z kvapaliny pri -183 \u00b0C na plyn, v\u0161etko naokolo brut\u00e1lne nam\u0155za a bez ohrevu by v\u00e1m zamrzli reduk\u010dn\u00e9 ventily. Samozrejme, v\u0161etko toto rob\u00edme v pr\u00edsnom kryt\u00ed (aspo\u0148 IP66) s certifik\u00e1ciou do v\u00fdbu\u0161n\u00e9ho prostredia.<\/p>\n\n\n\n

O t\u00fdchto veciach by sa dal pop\u00edsa\u0165 rom\u00e1n. Ja ich v\u0161ak dnes odsuniem na ved\u013eaj\u0161iu ko\u013eaj a do maxim\u00e1lnych detailov rozoberiem jeden jedin\u00fd, \u010dasto podce\u0148ovan\u00fd prvok na\u0161ej pr\u00e1ce: Uzemnenie a ochrann\u00e9 posp\u00e1janie (Equipotential Bonding)<\/a>.<\/strong><\/p>\n\n\n\n

Pre\u010do pr\u00e1ve posp\u00e1janie a uzemnenie?<\/h3>\n\n\n\n

Mo\u017eno si hovor\u00edte, pre\u010do chcem str\u00e1vi\u0165 cel\u00fd \u010dl\u00e1nok „len“ \u0165ahan\u00edm \u017eltozelen\u00fdch k\u00e1blov. D\u00f4vod je ten, \u017ee pri \u010distom medici\u00e1lnom kysl\u00edku<\/a> nepotrebujete na pr\u00faser otvoren\u00fd ohe\u0148 ani zlyhanie elektroniky. Kysl\u00edk s\u00e1m o sebe nehor\u00ed, ale extr\u00e9mne podporuje horenie.<\/p>\n\n\n\n

Pri pr\u00faden\u00ed kysl\u00edka v potrubiach vznik\u00e1 tren\u00edm statick\u00e1 elektrina<\/strong>. Ak sa tento n\u00e1boj nem\u00e1 ako vybi\u0165 kv\u00f4li zl\u00e9mu posp\u00e1janiu, vznikne iskra. A iskra v prostred\u00ed, kde je lok\u00e1lne zv\u00fd\u0161en\u00e1 koncentr\u00e1cia \u010dist\u00e9ho O2 (napr\u00edklad pri drobnom \u00faniku na ventile), znamen\u00e1 okam\u017eit\u00fa a fat\u00e1lnu expl\u00f3ziu. K\u00fdm vyhrievanie „len“ br\u00e1ni zamrznutiu technol\u00f3gie, dokonal\u00e9 posp\u00e1janie je va\u0161a priama poistka proti katastrofe. Je to ten najd\u00f4le\u017eitej\u0161\u00ed nevidite\u013en\u00fd \u0161t\u00edt, na ktorom in\u0161pektori a rev\u00edzni technici (RT) pri odovzd\u00e1van\u00ed nemocni\u010dn\u00e9ho diela nekompromisne baz\u00edruj\u00fa.<\/p>\n\n\n\n

Po\u010fme sa teda pozrie\u0165 pod lupu na to, ako sa to rob\u00ed profesion\u00e1lne.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

Posp\u00e1janie (Equipotential bonding): Ke\u010f mechanika nesta\u010d\u00ed<\/h3>\n\n\n\n

Najv\u00e4\u010d\u0161ou chybou nov\u00e1\u010dikov pri LOX staniciach je predpoklad, \u017ee „ve\u010f to potrubie je kovov\u00e9, zoskrutkovan\u00e9 dokopy, to je vodiv\u00e9 samo o sebe“. Omyl.<\/p>\n\n\n\n

    \n
  1. Izola\u010dn\u00fd efekt tesnen\u00ed:<\/strong> Pr\u00edruby na kysl\u00edkov\u00fdch potrubiach a odparova\u010doch obsahuj\u00fa \u0161peci\u00e1lne tefl\u00f3nov\u00e9 (PTFE<\/a>) alebo in\u00e9 nekovov\u00e9 tesnenia. Skrutky samotn\u00e9 \u010dasto neposkytuj\u00fa dostato\u010dn\u00fd a stabiln\u00fd prechodov\u00fd odpor na vyrovnanie potenci\u00e1lu. Preto mus\u00edme ka\u017ed\u00fa jednu pr\u00edrubu a ka\u017ed\u00fd ventil premosti\u0165<\/strong>.<\/li>\n\n\n\n
  2. Premos\u0165ovacie k\u00e1ble:<\/strong> Nepou\u017e\u00edvame hocijak\u00fd zbytok k\u00e1bla z dod\u00e1vky. Pou\u017e\u00edvame normovan\u00e9 meden\u00e9 lank\u00e1 (zv\u00e4\u010d\u0161a s prierezom min. 16 mm2) zalisovan\u00e9 v k\u00e1blov\u00fdch ok\u00e1ch, alebo \u0161peci\u00e1lne nerezov\u00e9 pletence. K\u00e1bel mus\u00ed by\u0165 dostato\u010dne flexibiln\u00fd, preto\u017ee cel\u00e1 kryog\u00e9nna technol\u00f3gia sa vplyvom obrovsk\u00fdch teplotn\u00fdch v\u00fdkyvov rozp\u00edna a s\u0165ahuje. Pevn\u00fd dr\u00f4t by sa po jednej zime odtrhol.<\/li>\n\n\n\n
  3. Kysl\u00edkov\u00e1 pasca (Extr\u00e9mne d\u00f4le\u017eit\u00e9!):<\/strong> V be\u017enej priemyselnej elektrike sme zvyknut\u00ed na zlep\u0161enie prechodov\u00e9ho odporu pou\u017ei\u0165 kontaktn\u00fa vazel\u00ednu alebo sprej. Pri kysl\u00edku na toto okam\u017eite zabudnite!<\/strong> Ak\u00e1ko\u013evek be\u017en\u00e1 vazel\u00edna, olej alebo mastnota na b\u00e1ze uh\u013eovod\u00edkov pri kontakte s \u010dist\u00fdm kysl\u00edkom spont\u00e1nne vzplanie (d\u00f4jde k r\u00e1zovej oxid\u00e1cii bez nutnosti inici\u00e1cie iskrou). Plochy pod k\u00e1blov\u00fdmi okami sa musia \u010disti\u0165 v\u00fdhradne mechanicky (nasucho), alebo s pou\u017eit\u00edm vysoko \u0161pecializovan\u00fdch fluorovan\u00fdch p\u00e1st (napr. typu Krytox<\/a>), ktor\u00e9 maj\u00fa certifik\u00e1t pre styk s kysl\u00edkom (BAM certifik\u00e1cia). Ak to urob\u00edte klasicky, sami vyr\u00e1bate bombu.<\/li>\n\n\n\n
  4. Hodnoty:<\/strong> Rev\u00edzak v\u00e1m pri odovzdan\u00ed zmeria prechodov\u00fd odpor ka\u017ed\u00e9ho jedn\u00e9ho spoja. V EX prostred\u00ed pre zamedzenie statick\u00e9ho n\u00e1boja normy hovoria o hodnot\u00e1ch do 1 megaohmu, ale v praxi pri ochrannom posp\u00e1jan\u00ed na LOX staniciach sa vy\u017eaduje s chirurgickou presnos\u0165ou prechodov\u00fd odpor do 0,1 ohmu<\/strong>.<\/li>\n<\/ol>\n\n\n\n
    \"\"<\/figure>\n\n\n\n

    Uzemnenie samotn\u00e9ho z\u00e1sobn\u00edka: Boj s galvanickou kor\u00f3ziou<\/h3>\n\n\n\n

    Samotn\u00fd kryog\u00e9nny z\u00e1sobn\u00edk (obrovsk\u00e1 dvojpl\u00e1\u0161\u0165ov\u00e1 termoska) mus\u00ed by\u0165 pripojen\u00fd na hlavn\u00fa uzem\u0148ovaciu s\u00fastavu nemocnice. Tu, vo vonkaj\u0161om prostred\u00ed, nastupuje boj s ch\u00e9miou.<\/p>\n\n\n\n

    LOX n\u00e1dr\u017ee a ich nohy s\u00fa zv\u00e4\u010d\u0161a z kvalitnej nerezovej ocele. Na\u0161e uzem\u0148ovacie vodi\u010de a zbernice s\u00fa \u010dasto z medi alebo pozinkovanej ocele. Ak napoj\u00edte meden\u00e9 oko priamo na nerezov\u00fa kon\u0161trukciu vonku (kde pr\u0161\u00ed a sne\u017e\u00ed), vytvor\u00edte uk\u00e1\u017ekov\u00fd galvanick\u00fd \u010dl\u00e1nok<\/strong>. Za\u010dn\u00fa tiec\u0165 bludn\u00e9 pr\u00fady a v priebehu p\u00e1r rokov v\u00e1m spoj doslova zo\u017eerie kor\u00f3zia. Odpor vysko\u010d\u00ed a n\u00e1dr\u017e str\u00e1ca uzemnenie. My preto z\u00e1sadne pou\u017e\u00edvame bimetalov\u00e9 (cupalov\u00e9) podlo\u017eky<\/a><\/strong> a \u0161peci\u00e1lne nerezov\u00e9 svorky, ktor\u00e9 tento chemick\u00fd prechod oddelia.<\/p>\n\n\n\n

    Ka\u017ed\u00fd zvod bleskozvodu a ka\u017ed\u00e9 pripojenie na zemni\u010d mus\u00ed by\u0165 o\u0161etren\u00e9 antikor\u00f3znou p\u00e1skou, okrem samotn\u00e9ho miesta styku. Syst\u00e9m sa zv\u00e4\u010d\u0161a zap\u00e1ja do „hviezdy“, aby sme predi\u0161li vzniku zemn\u00fdch slu\u010diek. Ak sa v\u00e1m v obvode uzavrie slu\u010dka a vonku udrie blesk alebo vznikne skrat, indukovan\u00fd pr\u00fad by mohol presko\u010di\u0165 v podobe iskry priamo na technol\u00f3gii. A \u010do sme si povedali o iskr\u00e1ch a kysl\u00edku na za\u010diatku? \u00c1no, katastrofa.<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    Zhrnutie od prof\u00edkov<\/h3>\n\n\n\n

    Mont\u00e1\u017e a \u00fadr\u017eba vonkaj\u0161ej ATEX LOX<\/a> stanice v nemocnici nie je pre ka\u017ed\u00e9ho. Zapoji\u0165 odparova\u010d a natiahnu\u0165 vyhrievac\u00ed k\u00e1bel v\u00e1s nau\u010dia r\u00fdchlo. Ale ch\u00e1pa\u0165 s\u00favislosti \u2013 pre\u010do nesmiete pou\u017ei\u0165 pri kysl\u00edku be\u017en\u00fa vazel\u00ednu, pre\u010do mus\u00edte rie\u0161i\u0165 bimetalick\u00e9 prechody v da\u017edi a ako sa spr\u00e1va statick\u00e1 elektrina pri pr\u00fadiacich plynoch \u2013 to rob\u00ed z be\u017en\u00e9ho elektrik\u00e1ra \u0161pi\u010dkov\u00e9ho prof\u00edka.<\/p>\n\n\n\n

    \"\"<\/figure>\n\n\n\n

    V MJM-AUTOMATION<\/strong> si zaklad\u00e1me na tom, \u017ee na\u0161i \u017eivnostn\u00edci nie s\u00fa len „\u0165aha\u010di k\u00e1blov“, ale technici, ktor\u00ed ch\u00e1pu, pre\u010do veci robia. Zveruj\u00fa sa n\u00e1m nemocni\u010dn\u00e9 projekty pr\u00e1ve preto, lebo vieme, \u017ee k\u00fdm zapojen\u00fd senzor chr\u00e1ni syst\u00e9m, to nen\u00e1padn\u00e9, perfektne zmeran\u00e9 posp\u00e1janie, chr\u00e1ni \u017eivoty.<\/p>\n\n\n\n

    Ak \u0165a tak\u00e1to odborn\u00e1 robota bav\u00ed a m\u00e1\u0161 na \u0148u hlavu aj ruky, vitaj v klube.<\/p>","protected":false},"excerpt":{"rendered":"

    Nazdar chlapi. Tu je v\u00e1\u0161 kolega, \u017eivnostn\u00edk-elektrik\u00e1r. Pre t\u00fdch, \u010do ma e\u0161te nepoznaj\u00fa \u2013 beh\u00e1m po stavb\u00e1ch a priemyseln\u00fdch mont\u00e1\u017each pod kr\u00eddlami MJM-AUTOMATION. Dnes si d\u00e1me na na\u0161om blogu nie\u010do z kateg\u00f3rie „vy\u0161\u0161ia d\u00edv\u010dia“. P\u00f4vodne som mohol nap\u00edsa\u0165 klasick\u00fd \u010dl\u00e1nok, ak\u00fdch s\u00fa na nete desiatky. Mohli sme sa bavi\u0165 o tom, ak\u00e9 farby maj\u00fa trubky […]<\/p>\n","protected":false},"author":1,"featured_media":793,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[25,26,23],"class_list":["post-790","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-nezaradene","tag-elektrikari","tag-mjm-automation","tag-zivnostnici"],"rttpg_featured_image_url":{"full":["https:\/\/www.mjm-automation.sk\/wp-content\/uploads\/2026\/08\/mjm-automation-25-08-2026-4.jpg",2048,1024,false],"landscape":["https:\/\/www.mjm-automation.sk\/wp-content\/uploads\/2026\/08\/mjm-automation-25-08-2026-4.jpg",2048,1024,false],"portraits":["https:\/\/www.mjm-automation.sk\/wp-content\/uploads\/2026\/08\/mjm-automation-25-08-2026-4.jpg",2048,1024,false],"thumbnail":["https:\/\/www.mjm-automation.sk\/wp-content\/uploads\/2026\/08\/mjm-automation-25-08-2026-4-150x150.jpg",150,150,true],"medium":["https:\/\/www.mjm-automation.sk\/wp-content\/uploads\/2026\/08\/mjm-automation-25-08-2026-4-300x150.jpg",300,150,true],"large":["https:\/\/www.mjm-automation.sk\/wp-content\/uploads\/2026\/08\/mjm-automation-25-08-2026-4-1024x512.jpg",1024,512,true],"1536x1536":["https:\/\/www.mjm-automation.sk\/wp-content\/uploads\/2026\/08\/mjm-automation-25-08-2026-4-1536x768.jpg",1536,768,true],"2048x2048":["https:\/\/www.mjm-automation.sk\/wp-content\/uploads\/2026\/08\/mjm-automation-25-08-2026-4.jpg",2048,1024,false],"trp-custom-language-flag":["https:\/\/www.mjm-automation.sk\/wp-content\/uploads\/2026\/08\/mjm-automation-25-08-2026-4-18x9.jpg",18,9,true]},"rttpg_author":{"display_name":"Milan Lys\u00edk","author_link":"https:\/\/www.mjm-automation.sk\/en\/author\/mjm-automation\/"},"rttpg_comment":0,"rttpg_category":"Nezaraden\u00e9<\/a>","rttpg_excerpt":"Nazdar chlapi. Tu je v\u00e1\u0161 kolega, \u017eivnostn\u00edk-elektrik\u00e1r. Pre t\u00fdch, \u010do ma e\u0161te nepoznaj\u00fa \u2013 beh\u00e1m po stavb\u00e1ch a priemyseln\u00fdch mont\u00e1\u017each pod kr\u00eddlami MJM-AUTOMATION. Dnes si d\u00e1me na na\u0161om blogu nie\u010do z kateg\u00f3rie „vy\u0161\u0161ia d\u00edv\u010dia“. P\u00f4vodne som mohol nap\u00edsa\u0165 klasick\u00fd \u010dl\u00e1nok, ak\u00fdch s\u00fa na nete desiatky. Mohli sme sa bavi\u0165 o tom, ak\u00e9 farby maj\u00fa trubky…","_links":{"self":[{"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/posts\/790","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/comments?post=790"}],"version-history":[{"count":2,"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/posts\/790\/revisions"}],"predecessor-version":[{"id":798,"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/posts\/790\/revisions\/798"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/media\/793"}],"wp:attachment":[{"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/media?parent=790"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/categories?post=790"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.mjm-automation.sk\/en\/wp-json\/wp\/v2\/tags?post=790"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}