Video: Puas yog National Electrical Code yog txoj cai?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov National Electrical Code ( NEC ) codifies yam tsawg kawg nkaus yuav tsum tau kev nyab xeeb hluav taws xob installations nyob rau hauv ib qho, standardized qhov chaw. Thaum lub NEC tsis yog nws tus kheej yog US txoj cai , cov NEC feem ntau yog los ntawm xeev lossis hauv zos txoj cai . Qhov twg NEC yog saws, yam tsawg yog txhaum cai.
Hais txog qhov no, lub hom phiaj ntawm National Electrical Code yog dab tsi?
National Electrical Code ( NEC ) yog tsom rau kev tiv thaiv tib neeg thiab khoom ntiag tug los ntawm kev phom sij cuam tshuam nrog hluav taws xob kev teeb tsa. Raws li tus preeminent hluav taws xob code nyob rau hauv lub teb chaws, nws tsim lub hauv paus ntawm hluav taws xob kev nyab xeeb.
Ib tug kuj yuav nug, leej twg sau National Electrical Code? NEC yog tsim los ntawm NFPA Pawg Neeg Saib Xyuas Hluav Taws Xob Hauv Tebchaws, uas suav nrog nees nkaum tus lej ua vaj huam sib luag thiab pawg neeg ua haujlwm sib raug zoo. Ua haujlwm ntawm NEC yog txhawb nqa los ntawm cov National Fire Protection Association.
Hais txog qhov no, tam sim no National Electric Code yog dab tsi?
NEW NFPA 70®, National Electrical Code ® ( NEC ®), teem lub hauv paus rau hluav taws xob kev nyab xeeb.
Puas yog NFPA 70 raug cai?
Yog li thaum lub NFPA 70 E txheem nws tus kheej tsis yog txoj cai , nws tsim cov txheej txheem kev nyab xeeb uas ua rau cov tswv ntiav ua raws li OSHA kev cai kev soj ntsuam nrog hluav taws xob kev nyab xeeb hauv chaw ua haujlwm thiab xav tau kev cob qhia kev nyab xeeb rau cov neeg ua haujlwm hluav taws xob.
Pom zoo:
Vim li cas Dalton txoj cai yog ib txoj cai txwv?
Kev txwv ntawm Dalton Txoj Cai Txoj cai lij choj tuav tau zoo rau cov pa roj tiag tiag ntawm qhov tsis tshua muaj siab, tab sis ntawm qhov siab, nws deviates loj. Qhov sib xyaw ntawm cov pa roj carbon monoxide yog non-reactive nyob rau hauv cov xwm. Nws kuj tseem xav tias kev sib cuam tshuam ntawm cov molecules ntawm txhua tus neeg cov pa roj yog tib yam li cov molecules hauv qhov sib xyaw
Dab tsi yog qhov txawv ntawm txoj cai khoom thiab txoj cai saw?
Peb siv txoj cai saw thaum sib txawv ntawm 'kev ua haujlwm ntawm kev ua haujlwm', zoo li f(g(x)) feem ntau. Peb siv txoj cai khoom thaum sib txawv ntawm ob txoj haujlwm sib npaug ua ke, zoo li f(x)g(x) feem ntau. Tab sis nco ntsoov lawv yog cov haujlwm cais: ib tus tsis vam khom rau cov lus teb rau lwm tus
Hund txoj cai thiab Pauli cais txoj cai nrog piv txwv yog dab tsi?
Hund's Rule hais tias yog 2 lossis ntau dua degenerate (piv txwv li tib lub zog) orbitals muaj, ib qho hluav taws xob nkag mus rau hauv ib qho kom txog thaum tag nrho lawv ib nrab puv ua ntej ua ke. ThePauli Exclusion Principle hais tias tsis muaj ob lub tshuab hluav taws xob tuaj yeem txheeb xyuas tau los ntawm tib pawg ntawm quantum tooj
LEEJ TWG tshaj tawm National Electrical Code?
Txoj Cai Hluav Taws Xob Hauv Tebchaws (NEC), lossis NFPA 70, yog tus qauv siv hauv cheeb tsam rau kev nyab xeeb ntawm kev teeb tsa hluav taws xob thiab khoom siv hauv Tebchaws Meskas. Nws yog ib feem ntawm National Fire Code series luam tawm los ntawm National Fire Protection Association (NFPA), lub koom haum kev lag luam ntiag tug
Koj tuaj yeem siv txoj cai khoom siv tsis yog txoj cai quotient?
Muaj ob qhov laj thawj vim li cas txoj cai quotient tuaj yeem ua tau zoo dua rau txoj cai tswj hwm lub zog ntxiv rau cov khoom lag luam hauv kev sib txawv ntawm cov quotient: Nws khaws cov denominators thaum simplifying qhov tshwm sim. Yog tias koj siv txoj cai fais fab ntxiv rau cov khoom siv, feem ntau koj yuav tsum nrhiav ib tus lej sib piv kom yooj yim rau qhov tshwm sim