Amamotho evikela ukuqhuma kwegesi awafanele izindawo ezidinga amamotho angaqhumisi uthuli. Lokhu kungenxa yezindinganiso kazwelonke ezihlukene zokuvikela ugesi abanamathela kuzo: amamotho angaqhumeki igesi ahambisana ne-GB3836, kuyilapho izinjini ezivikela uthuli zilandela i-GB12476.
Motors that meet both these standards and pass tests for each can be referred to as dual-marked explosion-proof motors. These motors are versatile, allowing interchangeability in environments requiring either gas or dust explosion-proof standards.