Coal gas’s flammable constituents include carbon monoxide and hydrogen, otsiriza akugwera pansi pa gulu la gasi la Class IIC. Zosiyana ndi gasi, zomwe zida zamagetsi zosaphulika za IIBT4 zimakwanira, gasi wa malasha amafunikira kugwiritsa ntchito IICT4.
Kuti muwonjezere chitetezo, conducting gap tests or minimum ignition current experiments is advisable.