UL txhais li cas ntawm Ib Hlau?
Taw qhia
Yog tias koj tau ua haujlwm nrog cov xaim hluav taws xob, tej zaum koj yuav pom qee cov ntawv lossis cov ntawv luv ntawm lawv. Ib qho ntawm cov no yog UL. Tab sis UL txhais li cas ntawm cov hlau? Hauv tsab xov xwm no, peb yuav tshawb txog lub ntsiab lus ntawm UL thiab nws qhov tseem ceeb hauv kev lag luam hluav taws xob.
UL yog dab tsi?
UL stands rau Underwriters Laboratories, ib lub tuam txhab ntiag tug uas muab kev pabcuam kev nyab xeeb rau ntau yam khoom siv hluav taws xob. UL tau tsim muaj nyob rau xyoo 1894 thiab nws lub tsev hauv paus nyob hauv Northbrook, Illinois.
UL lub luag haujlwm tseem ceeb yog los xyuas kom meej tias cov khoom siv hluav taws xob muaj kev nyab xeeb rau cov neeg siv khoom thiab cov neeg ua haujlwm. Txhawm rau ua tiav qhov no, UL siv cov txheej txheem thiab cov txheej txheem los kuaj thiab lees paub cov khoom. UL cov qauv kev nyab xeeb npog ntau yam khoom, los ntawm cov khoom siv hluav taws xob mus rau cov khoom siv, los ntawm cov roj teeb mus rau cov hluav taws kub.
UL yog ib qho ntawm ntau lub koom haum uas tuaj yeem muab ntawv pov thawj kev nyab xeeb rau cov khoom siv hluav taws xob. Lwm lub koom haum suav nrog CSA (Canadian Standards Association) thiab CE ( European Union's Conformité Européenne ).
Vim li cas UL tseem ceeb?
UL yog ib qho tseem ceeb vim nws pab xyuas kom meej tias cov khoom siv hluav taws xob muaj kev nyab xeeb rau kev siv. Hluav taws xob hluav taws xob thiab kev sib tsoo tuaj yeem ua rau tuag taus, yog li nws yog ib qho tseem ceeb uas yuav tsum muaj qhov system nyob rau hauv qhov chaw kom txo qhov kev pheej hmoo. Los ntawm kev soj ntsuam thiab ntawv pov thawj cov khoom, UL pab tiv thaiv cov khoom txaus ntshai los ntawm kev nkag mus rau hauv khw.
Tsis tas li ntawd, ntau lub tuam tsev hauv zos thiab lub teb chaws yuav tsum kom cov khoom siv hluav taws xob ua tau raws li cov qauv kev nyab xeeb. Qhov no txhais tau hais tias cov khoom uas tsis muaj ntawv pov thawj UL yuav tsis tso cai rau hauv qee lub tsev lossis thaj chaw.
Thaum kawg, daim ntawv pov thawj UL tuaj yeem cuam tshuam kev pov hwm kev pov hwm. Qee lub tuam txhab pov hwm yuav xav tau daim ntawv pov thawj UL rau qee yam khoom kom tau txais kev pab.
UL daim ntawv pov thawj ua haujlwm li cas?
UL daim ntawv pov thawj muaj ob peb kauj ruam. Ua ntej, cov chaw tsim khoom xa cov khoom mus rau UL rau kev kuaj. UL tom qab ntawd ntsuas cov khoom raws li nws cov qauv kev nyab xeeb. Yog tias cov khoom ua tau raws li cov qauv, UL yuav muab daim ntawv pov thawj rau cov chaw tsim khoom.
Daim ntawv pov thawj qhia tias cov khoom tau raug kuaj thiab tau ntawv pov thawj los ntawm UL. Cov cim yuav suav nrog UL logo, cov khoom npe, tus lej qauv, thiab lwm yam ntaub ntawv. Cov cim yuav raug luam tawm ntawm cov khoom, ntawm nws lub ntim, lossis hauv cov ntaub ntawv ntawm cov khoom.
Nws yog ib qho tseem ceeb kom nco ntsoov tias UL tsis kuaj txhua yam khoom hauv khw. Hloov chaw, UL muaj cov qauv txheej txheem uas cov khoom yuav tsum tau ua kom tau txais ntawv pov thawj. Cov neeg tsim khoom yuav tsum xyuas kom meej tias lawv cov khoom ua tau raws li cov qauv no ua ntej xa mus rau UL rau ntawv pov thawj.
UL txhais li cas ntawm cov hlau?
Daim ntawv pov thawj UL yog qhov tseem ceeb tshwj xeeb rau cov xaim hluav taws xob. Cov hlau yog siv los xa hluav taws xob, uas tuaj yeem ua rau muaj kev phom sij yog tias tsis ua haujlwm zoo. UL ntawv pov thawj pab xyuas kom cov xov hlau muaj kev nyab xeeb rau kev siv thiab yuav tsis ua rau hluav taws xob hluav taws xob lossis lwm yam xwm txheej.
Yog tias koj pom "UL" ntawm ib lub xaim, nws txhais tau hais tias cov hlau tau raug kuaj thiab tau lees paub los ntawm UL. Qhov no qhia tau hais tias cov hlau ua tau raws li UL cov qauv kev nyab xeeb rau cov xaim hluav taws xob. Qee cov xov hlau kuj tseem muaj cov ntaub ntawv ntxiv, xws li lub ntsuas hluav taws xob, ntsuas hluav taws xob, lossis ntsuas kub.
Nws yog ib qho tseem ceeb kom nco ntsoov tias tsis yog txhua cov xov hlau yuav tsum tau ntawv pov thawj UL. Qee zaum, lwm lub koom haum yuav muab ntawv pov thawj rau cov xov hlau. Txawm li cas los xij, UL daim ntawv pov thawj tau lees paub dav dav thiab lees txais hauv kev lag luam hluav taws xob.
Xaus
UL yog ib lub koom haum tseem ceeb hauv kev lag luam hluav taws xob. Los ntawm kev soj ntsuam thiab ntawv pov thawj cov khoom, UL pab xyuas kom meej tias cov khoom siv hluav taws xob muaj kev nyab xeeb rau kev siv. Daim ntawv pov thawj UL yog qhov tseem ceeb tshwj xeeb rau cov xaim hluav taws xob, uas yog siv los xa hluav taws xob. Yog tias koj pom "UL" ntawm ib lub xaim, nws txhais tau hais tias cov hlau tau raug kuaj thiab tau lees paub los ntawm UL.