Ifanele ukusetshenziswa ku-IIA, IIB, IIC Explosion yegesi eyingozi zone1 kanye ne-zone2.
Uthuli oluvuthayo IIIA,IIIB,IIIC zone 21 kanye nendawo 22
U-Ex-Mark:
Ex db IIC T* Gb,Ex tb IIIC T* Db.