Ma waya a Magetsi Ovomerezedwa Kuti Azigwiritsidwa Ntchito M'malo Omwe Madzi Omwe Amadziwika Ndi Omwewa

Code Code National Electrical (NEC) ndi ndondomeko yovomerezeka padziko lonse yomwe ikufotokoza ndondomeko ndi zidziwitso zowonjezera magetsi , kuphatikizapo pamene mungagwiritse ntchito makina a malo otupa kapena amvula. Amakonzedwanso zaka zitatu zilizonse, ndipo panthawi yalembayi, ndi 2017 NEC yomwe ilipo tsopano. Ngakhale kuti magetsi ambiri a mumzinda ndi a boma akutsatira NEC, malamulo okhawo a magetsi (omwe amachitidwa ndi akuluakulu a boma , kapena AJH) ndiwo malamulo omwe amapatsidwa.

Choncho, AJH yowunikirayo ndi malo abwino kwambiri ophunzirira zokhudzana ndi zofunikira zothandizidwa ndi madzi opanda madzi.

Kusiyana kwa waya

Ndalama zamagetsi zimakhala ndichitsulo cholimba kapena chosasunthika komanso amadziwika ngati woyendetsa . Mtsulo ukhoza kukhala woperewera wopanda kanthu kapena ukhoza kusungidwa ndi zinthu zopanda malire, zomwe zimapangidwa ndi pulasitiki yapadera. Nthaŵi zambiri, ndi mtundu wa kusungunula komwe umagwiritsa ntchito zomwe zimapangitsa woyendetsa kukhala woyenera, ntchito yonyowa, kapena yonyowa. Ngakhale waya uliwonse omwe amavomerezedwa malo ochepetsetsa kapena osungunuka angagwiritsenso ntchito m'malo owuma, pali mawaya owuma omwe alibe malo okwanira kuti azigwiritsidwa ntchito m'malo otupa kapena ozizira. Ntchito yoyenera kwa mitundu yosiyanasiyana ya waya imaperekedwa mu Article 310.10 ya NEC.

Kujambula kwa waya

Kutsekedwa kwa waya kumatengedwa ndi code yomwe ili ndi makalata komanso nthawi zina manambala. Njira yosavuta kudziwa ngati waya ndi malo otupa kapena osungunuka ndi kuyang'ana "W" polemba mauthenga pa waya.

Izi n'zosavuta kukumbukira chifukwa W mwachiwonekere amaimira "mvula." Komabe, pali mawaya omwe ali oyenera malo osungira omwe alibe W pakulemba kwawo. Ena mwa makalata ambiri omwe amapezeka mu wiring kwa malo okhalamo ndi awa:

• T - thermoplastic; kutanthauza mtundu wa pulasitiki

• X - thermoset; mtundu wina wa pulasitiki womwe umagwiritsidwa ntchito polemba
• H - zosagwira; Hs awiri amasonyeza kutentha kwakukulu kukana
• N - yophimba nylon; kusungunula kumakhala ndi chobvala cholimba cha nylon kuti chitetezedwe chowonjezeredwa
• Malo amvula

Kusintha Code

Mwachitsanzo, mitundu iwiri ya waya yomwe amagwiritsidwa ntchito popanga nyumba ndi THHN ndi THWN. THHN ndi thermoplastic, yopanda kutentha kwambiri (mpaka madigiri 90 C), ndi jekete. Siziyenera malo amvula. THWN ndi yofanana ndi THHN koma imayesedwa kokha kwa madigiri 75 digiri ndipo ili yoyenera malo amvula. Ndikofunika kuzindikira kuti ntchitoyo ingakhudze kutentha kwa waya. Mwachitsanzo, waya wa THHW amawerengedwa pa madigiri 90 C m'malo ouma koma amawerengedwa kwa madigiri 75 C pamene amagwiritsidwa ntchito m'malo amvula.

Mndandanda Wochepa wa Mawindo Amadzi

Zotsatirazi ndi zina mwa mitundu yomwe imagwiritsidwa ntchito kwambiri pa malo amvula. Kachiwiri, onaninso kuti ena alibe W kulemba nawo. Ndiponso, chiwerengero chotsatira kalata ya kalata kawirikawiri chimapereka mtengo wapamwamba kwa chiwerengero chimodzi kapena zingapo; Mwachitsanzo, THWN imayimilira madigiri 75 C mu malo ozizira ndi owuma, pamene THWN-2 imayesedwa pa madigiri 90 C pa malo amvula ndi owuma.

• THHW
• THW
• THW-2
• THWN
• THWN-2
• XHHW
• XHHW-2
• UF
• Gwiritsani ntchito
• Gwiritsani ntchito 2