Lub luag haujlwm tseem ceeb ntawm kev tiv thaiv kev tiv thaiv thaub qab yog kom nrawm dua ntawm cov khoom siv hluav taws xob muaj ntau yam tshwm sim, yog li tiv thaiv cov khoom siv hluav taws xob los ntawm kev puas tsuaj. Nws feem ntau yog nruab rau hauv txoj kab fais fab los tiv thaiv txhua cov khoom siv txuas nrog kab. Qhov kev tiv thaiv tig rov qab muaj cov lus teb nrawm thiab tsis siv neeg ua haujlwm rov qab ua haujlwm. Thaum cov surge voltage ploj, nws tuaj yeem cia li rov ua haujlwm lub xeev ua haujlwm ib txwm ua kom muaj kev ua haujlwm kom tsis tu ncua.
Tus ua hauj lwm ua haujlwm ntawm nthwv rov qab tiv thaiv feem ntau yog raws li cov khoom xws li nonkev sib txawv thiab hlau oxide. Thaum surge voltage tshwm nyob rau hauv Circuit Court, cov cheebtsam no yuav teb tau sai thiab txo qhov kev nyab xeeb, yog li zam kev puas tsuaj rau cov khoom siv. Tsis tas li ntawd, txoj kev tiv thaiv tig rov qab muaj cov kev tiv thaiv muaj nuj nqi, uas tuaj yeem txiav tawm cov Circuit Court muaj zog, uas tuaj yeem txiav tawm ntawm Circuit Court thaum tam sim no loj heev los tiv thaiv cov khoom puas.
Daim ntawv thov ntawm Surge thaub qab muaj kev tiv thaiv thiab haum rau cov khoom siv hluav taws xob, uas tuaj yeem tiv thaiv lub neej ntawm cov khoom siv, thiab txo cov nqi kho vaj tse, thiab txo cov nqi kho thiab hloov cov khoom siv.