Noj cov khoom siv hluav taws xob flameproof ua piv txwv, “tawg-pov thawj” qhia txog lub peev xwm los tiv thaiv sab nraud combustible sib tov los ntawm igniting los yog tawg txawm hais tias ib tug internal spark ua rau tawg ntawm cov khoom tawg nyob rau hauv lub casing..
Kev ua tau zoo ntawm “tawg-pov thawj” cov khoom siv hluav taws xob hauv kev tiv thaiv kev tawg hinges ntawm qhov tsim tshwj xeeb ntawm nws cov casing.