This part of IEC 60079 gives the specific requirements for the construction@ testing and marking of electrical apparatus@ parts of electrical apparatus and Ex components with the type of protection encapsulation "m".This part of IEC 60079 only applies for encapsulated electrical apparatus@ encapsulated parts of electrical apparatus and encapsulated Ex components (hereinafter always referred to as "m" apparatus) where the rated voltage does not exceed 10 kV with a relative tolerance of +10 %.This standard supplements the general requirements in IEC 60079-0.