Cables yog kev sib xyaw ua ke hauv cov hluav taws xob niaj hnub, siv rau kev xa cov hluav taws xob, cov cim, thiab cov ntaub ntawv hla ntau cov ntawv thov. Thaum xaiv ib qho cable rau kev teeb tsa, ib qho ntawm cov tseem ceeb tshaj plaws los txiav txim siab yog qhov kev ua haujlwm siab tshaj plaws ntawm kev sib txuas. Qhov no yog qhov tshwj xeeb tshaj yog rau cov kab uas kub, xws li cov chaw muaj chaw nyob, chaw nyob sab nraum zoov uas muaj cua sov monsup yog kev ua tsis tau. Cov txiv kab ntxwv cov kab ke yog cov kev xaiv nrov rau ntau cov ntawv hluav taws xob, ua tsaug rau lawv qhov pom, kav ntev, thiab hloov tau. Tab sis dab tsi raws nraim yog qhov kev ua haujlwm siab tshaj plaws rau ib txiv kab ntxwv sib zog cable? Kab lus no yuav kawm txog qhov kub tshaj plaws ntawm cov cables, vim li cas nws yog qhov tseem ceeb, thiab yuav ua li cas xaiv txoj cai cable rau koj cov kev xav tau.
To taub txog qhov kub tshaj plaws
Qhov nyiaj ntau tshaj plaws ntawm txoj hlua kub yog hais txog qhov siab tshaj plaws uas lub cable tuaj yeem nyab xeeb tiv thaiv nws cov ntaub ntawv lossis kev pheej hmoo tsis ua haujlwm ntawm lub cable nws tus kheej. Qhov ntsuas kub no yog txiav txim siab los ntawm hom rwb thaiv tsev thiab cov khoom siv uas siv hauv kev tsim muaj cable. Txhua lub cable yog tsim nrog cov ntaub ntawv tshwj xeeb uas muaj cov kev txwv kub uas muaj qhov kub. Tshaj qhov kev ua haujlwm siab tshaj plaws tuaj yeem ua rau ntau yam teeb meem, suav nrog:
Rwb thaiv tsev kev puas ntsoog: Cov cua sov ntau dhau tuaj yeem ua rau cov khoom siv rwb thaiv ib puag ncig tus neeg saib xyuas, muaj peev xwm ua rau luv luv hluav taws xob, muaj kev tsis ua haujlwm luv luv, thiab kev cuam tshuam hluav taws xob.
Tus neeg coj kev puas tsuaj: Cov kub kub tuaj yeem nce cov neeg ua haujlwm tsis kam ntawm cov neeg saib xyuas, muaj peev xwm ua rau overheating lossis txawm melting ntawm cov hlau.
Ua kom muaj kev phom sij nce ntxiv: Ntau cov cable hluav taws xob tau nthuav tawm cov phom sij hnyav, tshwj xeeb tshaj yog nyob rau hauv qhov chaw uas muaj cov cua sov tsis tuaj yeem ploj mus yooj yim.
Qhov kev ua haujlwm siab tshaj plaws yog feem ntau tau teev los ntawm cov chaw tsim khoom cable thiab feem ntau yog raws cov qauv xws li IEC (UL ElectroteCov Commission) lossis UL (Underwriters Chaw soj ntsuam).
Yam cuam tshuam rau kev ua haujlwm siab tshaj plaws ntawm ibTxiv Kab Ntxhw Txiv Kab Ntxwv Cable
Qhov nyiaj ntau tshaj plaws ntawm cov txiv kab ntxwv ncig yog cuam tshuam los ntawm ob peb cov ntsiab lus tseem ceeb:
1. Rwb thaiv tsev ntaub
Txoj kev rwb thaiv tsev ib puag ncig cov neeg saib xyuas kev ua si ib lub luag haujlwm tseem ceeb hauv kev txiav txim siab qhov kub tshaj plaws ntawm ib qho cable. Cov ntaub ntawv rwb thaiv tsev sib txawv muaj kev sib txawv ntawm qhov kub, thiab cov rwb thaiv tsev feem ntau yog qhov kev txwv ntawm kev txhawb siab kub tshaj plaws. Qee cov ntaub ntawv rwb thaiv tsev rwb thaiv tsev siv nyob rau hauv cov xees txiv kab ntxwv cov cable muaj:
PVC (polyvinyl chloride): PVC Rwb thaiv tsev yog dav siv nyob rau hauv qis-rau nruab nrab-voltage cables. Nws yog tus nqi-ua tau zoo thiab muab kev tiv thaiv zoo rau kev ya raws thiab tshuaj lom neeg. Txawm li cas los xij, pvc muaj qhov ntsuas kub tsawg tshaj plaws, feem ntau nyob ib ncig ntawm 70 degree mus rau 90 degree (158 degree f rau 194 degree f).
Xlpe (hla-txuas polyethylene): XLPE yog cov khoom siv rwb rov qab ua kom muaj kub ua kom zoo dua li PVC. Nws yog feem ntau siv nyob rau hauv ntau dua-voltage cables thiab cov ntawv thov uas xav tau cov kev ua kom muaj kub siab. Qhov nyiaj ntau tshaj plaws ntawm XLPE-insulated clesles tuaj yeem los ntawm 90 degree mus rau 110 degree f rau 230 degree f).
EPR (Ethylene Propylene Roj Hmab): EPR yog siv rau cov qoob loo uas yuav tsum tau ua haujlwm nyob rau hauv huab kev mob, xws li ib puag ncig ib puag ncig. Nws muaj lub tshav kub ua tsis tau zoo thiab yooj. Cables nrog eRR rwb thaiv tsev feem ntau muaj kev ua haujlwm ntau tshaj plaws ntawm 90 degree mus rau 120 degree f rau 248 degree f).
Roj Hmab (Thermoplastic Los Yog Thermoset): Roj hmab-insulated clesles yog paub rau lawv cov durability thiab siab-kub tsis kam. Roj hmab tuaj yeem tiv thaiv kub ntawm 70 Qib rau 150 degree (158 Degree F), nyob ntawm hom roj hmab tshwj xeeb siv.
Hom kev txiav txim siab tsis txiav txim siab tsuas yog lub cable qhov kub tsis kam tab sis kuj nws yooj yim, tua tsis tau, thiab kev ua tau zoo nyob rau hauv cov chaw hnyav.
2. Cov Khoom Siv Ua
Cov khoom siv rau tus neeg saib xyuas (xaim hluav taws xob uas nqa hluav taws xob tam sim no) yog lwm qhov cuam tshuam uas cuam tshuam qhov kev ua haujlwm siab tshaj plaws ntawm kev sib txuas. Cov Khoom Siv Hauv Cov Qauv Muaj xws li:
Tooj liab: Tooj liab yog cov khoom siv coj los siv ntau tshaj plaws, kev tiv thaiv qis, thiab muaj kev kub kub zoo. Tooj liab tuaj yeem ua haujlwm tooj los ntawm 90 degree mus rau 105 degree F rau 221 degree f), nyob ntawm cov rwb thaiv tsev siv.
Tooj dawb: Txhuas feem ntau siv nyob rau hauv cables rau cov ntawv thov loj loj vim nws lub zog sib zog thiab tus nqi qis dua piv rau tooj liab. Txawm li cas los xij, txhuas muaj qhov ua kom qis dua tooj liab thiab feem ntau ua haujlwm nyob rau ntawm qhov kub siab tshaj plaws ntawm 75 degree rau 905 degree f rau 194 degree f).
Cov khoom qhuab qhia yuav tsum raug xaiv raws li daim ntawv thov yuav tsum tau, suav nrog kev ua haujlwm ntau.
3. Cable tsim thiab kev tsim kho
Zuag qhia tag nrho tsim thiab kev tsim kho cov txiv kab ntxwv ncig cable kuj tseem tuaj yeem cuam tshuam nws qhov kev ntsuas kub. Cables with additional layers of protection, such as armor or shielding, may have different temperature tolerances than simpler cables with basic insulation. Tus naj npawb ntawm cov neeg saib xyuas nyob rau hauv lub cable, raws li kev npaj ntawm cov neeg saib xyuas no, tseem tuaj yeem cuam tshuam cov cua sov. Piv txwv li:
Ntau tus cwj pwm nyob rau hauv lub cable yuav ua rau kub txhim kho yog tias cov neeg saib xyuas yog nruj heev ntim. Hauv qhov no, lub cable tej zaum muaj qhov qis tshaj kub kom tiv thaiv kev kub ntxhov.
Armor lossis sheathing uas tiv thaiv lub cable los ntawm kev puas tsuaj lossis lwm yam sab nraud kuj tseem tuaj yeem pab txhawb kom kub tawm. Piv txwv li, cov cab-airored cables tuaj yeem tiv thaiv ntau dua vim lawv cov khaubncaws sab nraud ntxiv.
4. Ib puag ncig ib puag ncig
Cov txheej txheem ib puag ncig uas ib qho txiv kab ntxwv ncig yog ntsia tau ntau yam yuav cuam tshuam ntau qhov ntsuas kub tshaj plaws. Piv txwv li:
Thaj kub cua sov: Yog hais tias lub cable siv nyob rau hauv ib puag ncig uas ib puag ncig kub yog siab dua li qub, xws li nyob rau hauv ib qho cub lossis muaj kev muaj hluav taws xob muaj kev ntxhov siab ntxiv. Hauv cov xwm txheej zoo li no, kev ua haujlwm siab tshaj plaws ntawm lub cable yuav tsum tau hloov kho raws li qhov cua sov uas kub.
Kev muab qhib: Cesles ntsia hauv qhov chaw qhib, cov chaw muaj cua zoo yuav dissipate tshav kub kom zoo tshaj qhov chaw nruab nrab, tsis zoo cua. Thaum cov xaim hluav taws xob tau ntsia hauv ducts lossis conduits nrog tsawg kawg cua, cov cua sov tsim nyob rau hauv lub cable tuaj yeem ua rau overheating. Qhov no yuav xav tau siv cov xaim nrog cov kev ntsuas kub ntau dua.
Raug rau cov tshuaj lossis dej noo: Cov mob hnyav ib puag ncig xws li raug tshuaj lom neeg, roj, lossis dej haus tuaj yeem cuam tshuam cov khoom siv rwb thaiv tsev. Piv txwv li, cov xaim hluav taws xob tuaj yeem muaj cov tshuaj chuaulation yuav tau rwb thaiv tsev tshwj xeeb nrog kub siab dua thiab tshuaj tiv thaiv.
5. Tam sim no thauj khoom thiab cua kub
Tus nqi ntawm tam sim no ib lub cable nqa muaj qhov cuam tshuam ncaj qha rau nws kev ua haujlwm kub. Cov khoom siv tam sim no tsim cov cua sov ntau dua, uas tuaj yeem thawb lub cable kub tshaj nws qhov kev ua haujlwm nyab xeeb. Yog li ntawd, nws yog qhov tseem ceeb kom ntseeg tau tias qhov muaj peev xwm nqa tau tam sim no (ampacity) ntawm cov txiv kab ntxwv ncig txuas yog tsim nyog rau daim ntawv thov.
Overloading lub cable los yog khiav nws ntawm tag nrho cov peev xwm rau kev ncua sijhawm tuaj yeem ua rau muaj kev kub siab, tsis hais cov khoom siv los yog siv. Nyob rau hauv cov xwm txheej uas tau siv nyob ze lawv cov kev txwv ampac, xav kom tau muab rau cable qhov kev ntsuas kub ib puag ncig thiab cov txheej txheem ib puag ncig los tiv thaiv kev ua tsis tiav.
Siab tshaj plaws ua haujlwm kub rauTxiv kab ntxwv cov coricular cables
Qhov siab tshaj plaws kev ua haujlwm kub rau cov txiv kab ntxwv sib txuas cable yuav yog nyob ntawm nws cov qauv tsim tshwj xeeb, rwb thaiv tsev, cov ntaub ntawv npaj. Raws li ib qho kev qhia dav dav:
Cables nrog rau PVC cov feem ntau muaj kev ua haujlwm siab tshaj plaws ntawm 70 qib mus rau 90 degree (158 degree f rau 194 degree f).
Cables nrog XLPE rwb thaiv tsev tuaj yeem ua rau kub siab dua, nrog kev ua haujlwm siab tshaj plaws los ntawm 90 degree rau 110 degree f rau 230 degree f).
Roj hmab-insulated cables tuaj yeem ua haujlwm ntawm 90 degree mus rau 150 degree F), ua rau lawv haum rau qhov chaw siab.
High-temperature cables designed for extreme conditions, such as industrial machinery or environments with high ambient heat, may have insulation materials specifically rated for temperatures of up to 200 degree (392 degree F) or higher.
Cov neeg tsim khoom feem ntau muab cov kev ntsuas kub ua kom haum rau txhua hom kev sib tw nrog ua ntej kev teeb tsa tau ua tiav ntawm kev ua tau zoo thiab nyab xeeb.
Yuav ua li cas xaiv txoj cai txiv kab ntxwv ncig rau koj daim ntawv thov
Thaum xaiv cov txiv kab ntxwv sib txuas cable, nkag siab txog qhov kev ua haujlwm kub tshaj plaws yog qhov tseem ceeb kom ntseeg tau tias nws yuav ua haujlwm raws li qhov kev cia siab. Qee qhov kev txiav txim siab tseem ceeb suav nrog:
Ib puag ncig ib puag ncig: Xav txog qhov ntsuas kub, qhov cua, thiab raug tshuaj lom neeg lossis noo noo hauv thaj chaw teeb.
Lub Load Tam Sim No: Xyuas kom meej tias lub cable muaj peev xwm tuav qhov yuav tsum tau tam sim no tsis muaj ntau dua li nws qhov kub ntsuas.
Rwb thaiv tsev ntaub: Xaiv cov khoom siv rwb thaiv tsev raws li qhov ntsuas kub tshaj plaws xav tau rau koj daim ntawv thov tshwj xeeb.
Cov Qauv Kev Cai: Xyuas kom meej tias kev sib tw cable ntsib cov xov tooj hluav taws xob thiab cov qauv kev lag luam kom muaj kev nyab xeeb thiab ua haujlwm.