{"id":1064,"date":"2015-07-10T00:00:00","date_gmt":"2015-07-10T00:00:00","guid":{"rendered":"https:\/\/www.dgcrane.com\/posts\/what-nema-means-and-the-difference-between-each-rating\/"},"modified":"2024-09-09T06:55:54","modified_gmt":"2024-09-09T06:55:54","slug":"what-nema-means-and-the-difference-between-each-rating","status":"publish","type":"posts","link":"https:\/\/www.dgcrane.com\/cs\/nema-means-difference-rating\/","title":{"rendered":"Co znamen\u00e1 NEMA a rozd\u00edl mezi jednotliv\u00fdmi hodnocen\u00edmi"},"content":{"rendered":"

OT\u00c1ZKA:<\/p>\r\n

Mus\u00edm nainstalovat dv\u011b nov\u00e1 za\u0159\u00edzen\u00ed v na\u0161em pr\u016fmyslov\u00e9m za\u0159\u00edzen\u00ed. Jeden syst\u00e9m bude pou\u017eit v exteri\u00e9ru a jeden v interi\u00e9ru. Elektrik\u00e1\u0159 n\u00e1m \u0159ekl, \u017ee mus\u00edme pou\u017e\u00edt zvl\u00e1\u0161tn\u00ed kryt pro um\u00edst\u011bn\u00ed kabel\u00e1\u017ee pro oba syst\u00e9my a mus\u00ed m\u00edt hodnocen\u00ed NEMA. i \u00a1\u00af jsem sly\u0161el term\u00edn mnohokr\u00e1t, ale i \u00a1\u00af nejsem p\u0159esn\u011b jist\u00fd, co znamen\u00e1 NEMA a rozd\u00edl mezi jednotliv\u00fdmi hodnocen\u00edmi. i \u00a1\u00af m douf\u00e1m, \u017ee m\u016f\u017eete objasnit.<\/span><\/span><\/p>\r\n

\"\"\"\"<\/p>\r\n

POJ\u010eME TO ROZB\u00cdT:<\/span><\/p>\r\n

Pokud jste \u00a1\u00af znovu na trhu s motorov\u00fdm je\u0159\u00e1bem nebo va\u0161e za\u0159\u00edzen\u00ed ji\u017e jeden pou\u017e\u00edv\u00e1, pravd\u011bpodobn\u011b jste sly\u0161eli term\u00edn \u00a1\u0159 NEMA rating \u00a1\u00b1. Ve skute\u010dnosti n\u00e1m n\u011bkolik \u010dten\u00e1\u0159\u016f poslalo e-mail s ot\u00e1zkou, co ur\u010duje hodnocen\u00ed NEMA, a odpov\u011b\u010f na tuto ot\u00e1zku zn\u00ed: NEMA ano.
\r\nNEMA je zkratka pro National Electrical Manufacturers Association, kter\u00e1 byla zalo\u017eena v roce 1926, aby stanovila standardy pro spole\u010dnosti vyr\u00e1b\u011bj\u00edc\u00ed elektrick\u00e9 v\u00fdrobky. NEMA hodnocen\u00ed krytu se ve skute\u010dnosti vztahuje na jak\u00fdkoli typ elektrick\u00e9ho za\u0159\u00edzen\u00ed nebo veden\u00ed, kter\u00e9 \u00a1\u00af je instalov\u00e1no venku nebo v pr\u016fmyslov\u00e9m za\u0159\u00edzen\u00ed.
\r\nP\u016fvodn\u011b si NEMA stanovila za c\u00edl zajistit kvalitu elektrick\u00fdch za\u0159\u00edzen\u00ed, komponent\u016f a elektroinstalace. Ale jak se technologie postupem \u010dasu vyv\u00edjela, je pot\u0159eba ji chr\u00e1nit. Nyn\u00ed pot\u0159ebuj\u00ed elektrick\u00e9 komponenty, jako jsou ovl\u00e1dac\u00ed prvky, zraniteln\u00e1 za\u0159\u00edzen\u00ed a kabel\u00e1\u017e, ochranu p\u0159ed aplikac\u00ed a prost\u0159ed\u00edm, ve kter\u00e9m se pou\u017e\u00edvaj\u00ed. Nejlep\u0161\u00ed zp\u016fsob, jak zajistit tuto ochranu, je um\u00edstit je do krytu nebo sk\u0159\u00edn\u011b.<\/p>\r\n

P\u0159esto\u017ee NEMA nen\u00ed odpov\u011bdn\u00e1 za elektrick\u00e9 sk\u0159\u00edn\u011b, vyvinula syst\u00e9m hodnocen\u00ed, kter\u00fd je klasifikuje a reguluje. Od t\u00e9 doby se hodnocen\u00ed NEMA stalo standardem pro sk\u0159\u00edn\u011b v\u0161eho druhu. ka\u017ed\u00e9 hodnocen\u00ed NEMA bylo vyvinuto tak, aby odpov\u00eddalo konkr\u00e9tn\u00ed aplikaci a prost\u0159ed\u00ed, co\u017e pom\u00e1h\u00e1 zajistit, \u017ee \u00a1\u00af znovu pou\u017e\u00edv\u00e1te spr\u00e1vn\u00fd kryt pro v\u00e1\u0161 provoz. a tam \u00a1\u00af a\u017e k tomu dobr\u00fd d\u016fvod.<\/p>\r\n

Sk\u0159\u00edn\u011b s hodnocen\u00edm NEMA pln\u00ed velmi d\u016fle\u017eitou funkci: kontroluj\u00ed vstup a v\u00fdstup. vniknut\u00ed je definov\u00e1no jako l\u00e1tka \u00a1\u00af je schopnost vstoupit do struktury nebo prostoru \u00a1\u00aa v tomto p\u0159\u00edpad\u011b, elektrick\u00e9 sk\u0159\u00edn\u011b. v\u00fdstup, na druh\u00e9 stran\u011b, je definov\u00e1n jako l\u00e1tka \u00a1\u00af schopnost uniknout ze struktury nebo prostoru. A\u010dkoli se v\u011bt\u0161ina hodnocen\u00ed NEMA zam\u011b\u0159uje na blokov\u00e1n\u00ed vniknut\u00ed (zabr\u00e1n\u011bn\u00ed l\u00e1tce ve vniknut\u00ed do va\u0161eho elektrick\u00e9ho krytu), existuje n\u011bkolik takov\u00fdch, kter\u00e9 tak\u00e9 blokuj\u00ed v\u00fdstup (zabra\u0148uj\u00ed l\u00e1tce v \u00faniku z va\u0161eho elektrick\u00e9ho krytu). to \u00a1\u00af je nezbytn\u00e9 zvolit spr\u00e1vn\u00e9 NEMA hodnocen\u00ed pro va\u0161i aplikaci, aby se ochr\u00e1nily va\u0161e elektrick\u00e9 komponenty a veden\u00ed. zde \u00a1\u00af a\u017e k rozpisu nejb\u011b\u017en\u011bji pou\u017e\u00edvan\u00fdch hodnocen\u00ed NEMA a k \u010demu byly navr\u017eeny:<\/p>\r\n

    \r\n\t
  1. Kryty NEMA 1 se obvykle pou\u017e\u00edvaj\u00ed k ochran\u011b ovl\u00e1dac\u00edch prvk\u016f a vnit\u0159n\u00edch sou\u010d\u00e1st\u00ed p\u0159ed ciz\u00edmi p\u0159edm\u011bty a osobami. Byly vyvinuty pro vnit\u0159n\u00ed pou\u017eit\u00ed a chr\u00e1n\u00ed pracovn\u00edky t\u00edm, \u017ee omezuj\u00ed p\u0159\u00edstup k potenci\u00e1ln\u011b nebezpe\u010dn\u00fdm sou\u010d\u00e1stem. Nebyly navr\u017eeny tak, aby zadr\u017eovaly pevn\u00e9 ne\u010distoty, jako je voda, prach, olej a led. A\u010dkoli jsou sk\u0159\u00edn\u011b NEMA vyrobeny se z\u00e1padkov\u00fdmi dve\u0159mi, nemaj\u00ed povrch ut\u011bsn\u011bn\u00fd t\u011bsn\u011bn\u00edm.<\/li>\r\n\t
  2. Sk\u0159\u00edn\u011b NEMA 3R se \u010dasto pou\u017e\u00edvaj\u00ed ve venkovn\u00edch aplikac\u00edch pro elektroinstalaci a propojovac\u00ed krabice. Chr\u00e1n\u00ed pracovn\u00edky p\u0159ed nebezpe\u010dn\u00fdmi \u010d\u00e1stmi a chr\u00e1n\u00ed p\u0159ed pevn\u00fdmi ne\u010distotami, jako je d\u00e9\u0161\u0165, pl\u00edskanice, sn\u00edh a vn\u011bj\u0161\u00ed tvorba ledu.<\/li>\r\n\t
  3. Sk\u0159\u00edn\u011b NEMA 4 jsou vyrobeny pro vnit\u0159n\u00ed nebo venkovn\u00ed pou\u017eit\u00ed a jsou tak\u00e9 navr\u017eeny tak, aby chr\u00e1nily p\u0159ed vniknut\u00edm de\u0161t\u011b, pl\u00edskanic a sn\u011bhu. Zabra\u0148uj\u00ed pronik\u00e1n\u00ed pevn\u00fdch ne\u010distot, jako je prach a ne\u010distoty, a z\u016fst\u00e1vaj\u00ed nepo\u0161kozeny tvorbou ledu na vn\u011bj\u0161\u00edm povrchu. NEMA 4 kryty se \u010dasto pou\u017e\u00edvaj\u00ed v aplikac\u00edch, kde je za\u0159\u00edzen\u00ed st\u0159\u00edk\u00e1no nebo om\u00fdv\u00e1no hadic\u00ed \u00a1\u00aa zvl\u00e1\u0161t\u011b kdy\u017e se pou\u017e\u00edv\u00e1 tlakov\u00fd proud vody. Maj\u00ed povrch ut\u011bsn\u011bn\u00fd t\u011bsn\u011bn\u00edm a sev\u0159en\u00e1 dv\u00ed\u0159ka pro maxim\u00e1ln\u00ed ut\u011bsn\u011bn\u00ed.<\/li>\r\n\t
  4. Sk\u0159\u00edn\u011b NEMA 4X jsou obvykle vyrobeny z nerezov\u00e9 oceli nebo sklolamin\u00e1tu. oni \u00a1\u00af znovu navr\u017eeny pro pou\u017eit\u00ed v drsn\u011bj\u0161\u00edm prost\u0159ed\u00ed ne\u017e standardn\u00ed NEMA 4 kryty. Tyto kryty poskytuj\u00ed ochranu proti vniknut\u00ed pevn\u00fdch ciz\u00edch p\u0159edm\u011bt\u016f a ne\u010distot, v\u010detn\u011b prachu, sn\u011bhu, de\u0161t\u011b a tlakov\u00e9 vody z hadic. Z\u016fst\u00e1vaj\u00ed nepo\u0161kozen\u00e9 vn\u011bj\u0161\u00ed tvorbou ledu a poskytuj\u00ed dal\u0161\u00ed \u00farove\u0148 ochrany proti korozi. Kryty NEMA 4X se \u010dasto pou\u017e\u00edvaj\u00ed v petrochemick\u00fdch za\u0159\u00edzen\u00edch a pro aplikace na zpracov\u00e1n\u00ed potravin \u00a1\u00aa, kde se za\u0159\u00edzen\u00ed mus\u00ed pravideln\u011b m\u00fdt dezinfek\u010dn\u00edmi prost\u0159edky<\/li>\r\n\t
  5. Kryty NEMA 6 se pou\u017e\u00edvaj\u00ed pro vnit\u0159n\u00ed nebo venkovn\u00ed aplikace k ochran\u011b elektroinstalace a elektrick\u00fdch sou\u010d\u00e1st\u00ed p\u0159ed vodou. Kryty NEMA 6 chr\u00e1n\u00ed p\u0159ed vniknut\u00edm vody p\u0159i ob\u010dasn\u00e9m pono\u0159en\u00ed v omezen\u00e9 hloubce.<\/li>\r\n\t
  6. Kryty NEMA 6P poskytuj\u00ed zvl\u00e1\u0161tn\u00ed m\u00edru ochrany proti korozi a mus\u00ed z\u016fstat nepo\u0161kozen\u00e9 v p\u0159\u00edpad\u011b vn\u011bj\u0161\u00ed tvorby ledu. Kryty NEMA 6P jsou navr\u017eeny tak, aby chr\u00e1nily p\u0159ed vniknut\u00edm vody b\u011bhem dlouhodob\u00e9ho pono\u0159en\u00ed v omezen\u00e9 hloubce.<\/li>\r\n\t
  7. NEMA 12 kryty jsou navr\u017eeny bez \u00a1\u0159 \u00a1\u00b1 knockouts; pou\u017e\u00edvaj\u00ed se ve vnit\u0159n\u00edch prostor\u00e1ch k omezen\u00ed p\u0159\u00edstupu person\u00e1lu k nebezpe\u010dn\u00fdm sou\u010d\u00e1stem ak ochran\u011b uzav\u0159en\u00e9ho za\u0159\u00edzen\u00ed p\u0159ed vnik\u00e1n\u00edm pevn\u00fdch ciz\u00edch ne\u010distot, jako je pol\u00e9tav\u00fd prach, padaj\u00edc\u00ed \u0161p\u00edna, kameny, vl\u00e1kna, vl\u00e1kna a odletuj\u00edc\u00ed l\u00e1tky. Chr\u00e1n\u00ed tak\u00e9 uzav\u0159en\u00e9 za\u0159\u00edzen\u00ed p\u0159ed kapaj\u00edc\u00edmi (nekorozivn\u00edmi) kapalinami.<\/li>\r\n\t
  8. Sk\u0159\u00edn\u011b NEMA 4\/12 se vyzna\u010duj\u00ed konstruk\u010dn\u00edmi aspekty sk\u0159\u00edn\u00ed NEMA 4 a NEMA 12. Sk\u0159\u00ed\u0148 \u010dasto obsahuje oto\u010dn\u00e9 dve\u0159e, skryt\u00e9 panty a zadn\u00ed mont\u00e1\u017en\u00ed otvory pro snadnou instalaci a pro ochranu elektrick\u00fdch sou\u010d\u00e1st\u00ed p\u0159ed pevn\u00fdmi ne\u010distotami, vodou a tvorbou ledu na vn\u011bj\u0161\u00edm povrchu. T\u011bsn\u011bn\u00edm ut\u011bsn\u011bn\u00fd povrch a sev\u0159en\u00e1 dv\u00ed\u0159ka zaji\u0161\u0165uj\u00ed maxim\u00e1ln\u00ed ut\u011bsn\u011bn\u00ed pro aplikace, kde je za\u0159\u00edzen\u00ed oplachov\u00e1no nebo st\u0159\u00edk\u00e1no tlakov\u00fdm proudem vody.<\/li>\r\n<\/ol>\r\n

    UZAV\u0158EN\u00cd HODNOTY NEMA PRO NEBEZPE\u010cN\u00c1 M\u00cdSTA:<\/span><\/p>\r\n

    Oba kryty NEMA 7 a NEMA 10 jsou navr\u017eeny tak, aby obsahovaly vnit\u0159n\u00ed exploze bez vn\u011bj\u0161\u00edho nebezpe\u010d\u00ed. Kryty NEMA 8 jsou navr\u017eeny tak, aby zabr\u00e1nily spalov\u00e1n\u00ed v za\u0159\u00edzen\u00edch pono\u0159en\u00fdch do oleje, zat\u00edmco kryty NEMA 9 zabra\u0148uj\u00ed vzn\u00edcen\u00ed ho\u0159lav\u00e9ho prachu. Tyto konkr\u00e9tn\u00ed kryty jsou definov\u00e1ny n\u00e1rodn\u00edm elektrick\u00fdm k\u00f3dem? (NEC) a National Fire Protection Association (NFPA).<\/p>\r\n

    Zde \u00a1\u00af, jak to funguje: N\u00e1rodn\u00ed elektrick\u00fd k\u00f3d (NEC) je m\u011b\u0159\u00edtkem pro bezpe\u010dn\u00fd elektrick\u00fd n\u00e1vrh, instalaci a kontrolu na ochranu p\u0159ed elektrick\u00fdmi nebezpe\u010d\u00edmi. NFPA je nejl\u00e9pe zn\u00e1m\u00fd pro sv\u00e9 sponzorstv\u00ed NEC a jejich standard pro elektrickou bezpe\u010dnost na pracovi\u0161ti, zn\u00e1m\u00fd jako NFPA 70. Laicky \u0159e\u010deno, NFPA 70 je zkratka pou\u017e\u00edvan\u00e1 pro elektrickou a po\u017e\u00e1rn\u00ed bezpe\u010dnost na pracovi\u0161ti, a to \u0159e\u0161\u00ed instalaci elektrick\u00fdch vodi\u010d\u016f, signaliza\u010dn\u00edch vodi\u010d\u016f a kabel\u016f z optick\u00fdch vl\u00e1ken v komer\u010dn\u00edch, reziden\u010dn\u00edch a pr\u016fmyslov\u00fdch provozech.<\/p>\r\n

    KONKR\u00c9TN\u011aJI:<\/p>\r\n

      \r\n\t
    1. Sk\u0159\u00edn\u011b NEMA 7 jsou navr\u017eeny pro vnit\u0159n\u00ed aplikace klasifikovan\u00e9 jako potenci\u00e1ln\u011b nebezpe\u010dn\u00e9. Sk\u0159\u00edn\u011b NEMA 7 se obvykle pou\u017e\u00edvaj\u00ed pro m\u00edsta definovan\u00e1 jako t\u0159\u00edda 1 (potenci\u00e1ln\u011b v\u00fdbu\u0161n\u00fd plyn nebo p\u00e1ra).<\/li>\r\n\t
    2. Sk\u0159\u00edn\u011b NEMA 8 jsou podobn\u00e9 sk\u0159\u00edn\u00edm NEMA 7. Pou\u017e\u00edvaj\u00ed se tak\u00e9 v m\u00edstech t\u0159\u00eddy 1 (potenci\u00e1ln\u011b v\u00fdbu\u0161n\u00fd plyn nebo p\u00e1ra). ale mohou b\u00fdt pou\u017eity uvnit\u0159 nebo venku, a oni \u00a1\u00af znovu speci\u00e1ln\u011b navr\u017eeny k ochran\u011b elektroinstalace a elektrick\u00e9 sou\u010d\u00e1sti pono\u0159en\u00e9 v oleji.<\/li>\r\n\t
    3. Sk\u0159\u00edn\u011b NEMA 9 jsou konstruov\u00e1ny pro vnit\u0159n\u00ed pou\u017eit\u00ed v nebezpe\u010dn\u00fdch m\u00edstech t\u0159\u00eddy II, divize 1, jak je definov\u00e1no Severoamerick\u00fdm klasifika\u010dn\u00edm syst\u00e9mem a N\u00e1rodn\u00ed asociac\u00ed po\u017e\u00e1rn\u00ed ochrany (NFPA). Nebezpe\u010dn\u00e1 m\u00edsta t\u0159\u00eddy II, divize 1 zahrnuj\u00ed potenci\u00e1ln\u011b v\u00fdbu\u0161n\u00fd prach, kter\u00fd je p\u0159\u00edtomen b\u011bhem b\u011b\u017en\u00e9 provozn\u00ed doby.<\/li>\r\n\t
    4. Kryty NEMA 10 jsou navr\u017eeny tak, aby spl\u0148ovaly po\u017eadavky Mine Safety and Health Administration, 30 CFR, \u010d\u00e1st 18.<\/li>\r\n<\/ol>\r\n

      Popt\u00e1vka po elektrick\u00fdch za\u0159\u00edzen\u00edch daleko p\u0159ed\u010dila ostatn\u00ed prost\u0159edky hnac\u00ed s\u00edly. S t\u00edm, jak st\u00e1le roste pou\u017e\u00edv\u00e1n\u00ed elektrick\u00fdch v\u00fdrobk\u016f, roste i pot\u0159eba v\u00fdrobn\u00edch p\u0159edpis\u016f pro elektrickou bezpe\u010dnost. NEMA zavedla jednoduch\u00fd proces kategorizace, kter\u00fd zaji\u0161\u0165uje kompatibilitu mezi za\u0159\u00edzen\u00edmi, podporuje bezpe\u010dnost pracovn\u00edk\u016f a pokra\u010duje ve v\u00fdvoji nov\u00fdch standard\u016f pro neust\u00e1le se vyv\u00edjej\u00edc\u00ed elektrotechnick\u00fd pr\u016fmysl.<\/p>","protected":false},"excerpt":{"rendered":"OT\u00c1ZKA: Mus\u00edm nainstalovat dv\u011b nov\u00e1 za\u0159\u00edzen\u00ed v na\u0161em pr\u016fmyslov\u00e9m za\u0159\u00edzen\u00ed. Jeden syst\u00e9m bude pou\u017eit v exteri\u00e9ru a jeden v interi\u00e9ru. Elektrik\u00e1\u0159 n\u00e1m \u0159ekl, \u017ee mus\u00edme pou\u017e\u00edt zvl\u00e1\u0161tn\u00ed kryt pro um\u00edst\u011bn\u00ed kabel\u00e1\u017ee pro oba syst\u00e9my a mus\u00ed m\u00edt hodnocen\u00ed NEMA. i \u00a1\u00af sly\u0161el jsem term\u00edn [\u2026]","protected":false},"featured_media":1263,"parent":0,"menu_order":0,"template":"","posts_category":[351],"posts_tag":[7,41,33],"class_list":["post-1064","posts","type-posts","status-publish","has-post-thumbnail","hentry","posts_category-blog","posts_tag-crane","posts_tag-crane-posts","posts_tag-news"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts\/1064"}],"collection":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts"}],"about":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/types\/posts"}],"version-history":[{"count":3,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts\/1064\/revisions"}],"predecessor-version":[{"id":1136,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/xmxposts\/1064\/revisions\/1136"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/media\/1263"}],"wp:attachment":[{"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/media?parent=1064"}],"wp:term":[{"taxonomy":"posts_category","embeddable":true,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/posts_category?post=1064"},{"taxonomy":"posts_tag","embeddable":true,"href":"https:\/\/www.dgcrane.com\/cs\/wp-json\/wp\/v2\/posts_tag?post=1064"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}