This part of IEC 60079 gives the specific requirements for the construction, testing and marking of electrical Ex Equipment, parts of electrical Ex Equipment and Ex Components with the Type of Protection encapsulation m intended for use in explosive gas atmospheres or explosive dust atmospheres. For Levels of Protection mb and mc , this document applies where the rated voltage does not exceed 11 kV ACRMS or DC. For Level of Protection ma , this document applies where the rated voltage does not exceed 1 kV ACRMS or DC. NOTE In this document, encapsulated Ex Equipment is often referred to as m equipment. This document does not take account of any risk due to an emission of flammable or toxic gas from the dust. This document supplements and modifies the general requirements of IEC 60079-0. Where a requirement of this document conflicts with a requirement of IEC 60079-0, the requirement of this document takes precedence.