This part of IEC 60079 contains the specific requirements for the construction, testing and marking of electrical apparatus, parts of electrical apparatus and Ex components in the type of protection powder filling "q", intended for use in potentially explosive atmospheres of gas, vapour and mist. NOTE - Powder-filled electrical apparatus and Ex components may contain electronic circuits, transformers, protection fuses, relays, intrinsically safe electrical apparatus, associated electrical apparatus, switches, etc. This standard supplements IEC 60079-0, the requirements of which apply to powder-filled electrical apparatus. This standard applies to electrical apparatus, parts of electrical apparatus and Ex components with: - a rated current less than or equal to 16 A; - a rated power consumption less than or equal to 1 000 VA, intended to be connected to a supply not exceeding 1 000 V.