Kayan lantarki na Class I baya bin ƙayyadadden tsarin ƙididdigewa.
Don kayan aikin lantarki na Class II, Ana ƙayyade rarrabuwa ta nau'in iskar gas mai ƙonewa da aka fuskanta. An ƙara rarraba wannan kayan aiki zuwa nau'ikan abubuwan hana fashewa guda uku: IIA, IIB, da IIC.
A cikin mahalli masu amfani da kayan lantarki na Class I, inda iskar gas mai iya ƙonewa banda methane suna nan, yarda da ƙa'idodin tabbatar da fashewar Class I da Class II ya zama tilas.
Dangane da takamaiman kaddarorin na m muhallin kura, Kayan lantarki na Class III ya kasu kashi uku: IIIA, IIIB, da kuma IIIC.