National Electrical Code Rules for Wiring in Wet Locations
I National Electrical Code (NEC) inyandiko inozivikanwa munyika yose inotsanangura mazano uye zvinyorwa zvekugadzirisa magetsi , kusanganisira kana iwe ungashandisa kushandiswa kwemvura kunzvimbo isina mvura. Rinovandudzwa kwemakore matatu oga oga, uye panguva yekunyora uku, ndiyo 2017 NEC iripo ikozvino. Kunyange zvazvo maguta akawanda uye magetsi enyika ari kutevera NEC, chete magetsi emagetsi eko (anosungirirwa nechiremera ane kodzero , kana AJH) mutemo mune imwe nzvimbo inopa simba.
Nokudaro, nzvimbo yeAJH iyo ndiyo nzvimbo yakanakisisa yekudzidza pamusoro pezvinodikanwa zvekunyorovesa kana kushandiswa kwemvura.
Wire Kusiyana
Tsanzura yemagetsi inosimba yakasimba kana yakanyungudutswa uye inozivikanwawo semutungamiriri . Tsero inogona kunge isina chitoro kana inogona kunge yakasungirirwa nehutu hunopfuurira hwezvinhu zvisingaiti, izvo zvinowanzoitwa nepurasitiki chaiyo. Muzviitiko zvakawanda, iyo ndiyo yakashandiswa kusungirirwa inoshandisa iyo inoita mutungamiri akakodzera mumvura yakasviba, yakasviba, kana mvura. Nepo chero firi iyo inogamuchirwa panzvimbo dzisina mvura kana nzvimbo dzine mvura inogonawo kushandiswa munzvimbo dzakaoma, pane dzimwe dzakaoma-nzvimbo dzisina kushandiswa kwakakodzera kushandiswa mumvura isina mvura kana mvura yakanyorova. Kushandiswa kwakakodzera kune marudzi akasiyana-siyana ematare kunopiwa muChitsauko 310.10 cheN NEC.
Wire Coding
Kushandiswa kwepini kunowanikwa nekodhi inosanganisira tsamba uye dzimwe nguva nhamba. Nzira yakanakisisa yekuona kana foni yakakodzera nzvimbo isina mvura kana mvura yakanyanyisa ndeyokutsvaga "W" mukunyora coding pane kutengesa kwetambo.
Izvi zviri nyore kuyeuka nokuti W inonyanya kumirira "mvura." Zvisinei, pane dzimwe tsvina dzinokodzera nzvimbo dzisina mvura dzisingatakuri W pakukodha kwayo. Mamwe mazita akawandisa e-code makamba akawanikwa mu wiring nokuda kwekugara maitiro anosanganisira:
- T - thermoplastic; achitaura nezvechimiro chepurasitiki
- X - thermoset; chimwe chimiro chepurasitiki chinoshandiswa kuisa pfungwa
- H - kupisa kusinga; Hs maviri inoratidza hurefu hwekudzivirira
- N - nylon-jacketed; kusungirirwa kune chigadziko chinogara kwenguva refu cheyinyuchi chekudzivirirwa kwakawedzerwa
- W - nzvimbo dzakaoma
Kugadzirisa Code
Semuenzaniso, maviri emhando dzakasiyana-siyana dzematafura anoshandiswa mumagariro ekugara ndiwo THHN uye THWN. THHN inonzi thermoplastic, inopisa kusisa (kusvika kune 90 degrees C), uye nylon-jacketed. Haisi kukodzera nzvimbo dzakaoma. THWN yakafanana neHHN asi inongororwa chete yepamusoro ye-75 degrees C uye yakakodzera nzvimbo dzakaoma. Zvakakosha kucherechedza kuti shanduro inogona kuchinja kutarisa kwekutengesa kwetambo. Semuenzaniso, tambo yeHHW inotaridzirwa 90 degrees C munzvimbo dzomumatare asi inongororwa chete yeC-75 C C iyo inoshandiswa munzvimbo dzine mvura.
Mutsara Wemvura Wemafuta
Izvi zvinotevera ndezvimwe zvinowanzoshandiswa nematairi akakodzera munzvimbo dzakadzika. Zvakare, cherechedza kuti vamwe havana W pakukodha kwavo. Uyewo, nhamba inotevera tsamba yekutsanangurira inowanzoratidza huwandu hwepamusoro kune imwechete kana kupfuura yezviyero; somuenzaniso, THWN inotaridzirwa ne-75 degrees C munzvimbo dzose dzomumvura uye dzakaoma, nepo THWN-2 inotaridzirwa 90 degrees C kumativi ose emvura uye akaoma.
- THHW
- THW
- THW-2
- THWN
- THWN-2
- XHHW
- XHHW-2
- UF
- Shandisa
- KUSHANDISA-2