"This standard gives the specific requirements for the construction@ testing and marking of electrical equipment@ parts of electrical equipment and Ex components with the type of protection encapsulation ""m"" intended for use in explosive gas atmospheres or explosive dust atmospheres. This standard applies only for encapsulated electrical equipment@ encapsulated parts of electrical equipment and encapsulated Ex components (hereinafter always referred to as ""m"" equipment) where the rated voltage does not exceed 11 kV. The application of electrical equipment in atmospheres@ which may contain explosive gas as well as combustible dust simultaneously may require additional protective measures. This standard does not apply to dusts of explosives@ which do not require atmospheric oxygen for combustion@ or to pyrophoric substances This standard does not take account of any risk due to an emission of flammable or toxic gas from the dust. This standard supplements and modifies the general requirements ofANSI/ISA- 60079-0. Where a requirement of this standard conflicts with a requirement of ANSI/ISA-60079-0@ the requirement of this standard shall take precedence."
ISA 60079-18-2012 history
2012ISA 60079-18-2012 "Explosive atmospheres - Part 18: Equipment protection by encapsulation ""m"" (12.23.01)"
2009ISA 60079-18-2009 Electrical Apparatus for Use in Class I, Zone 1 Hazardous (Classified) Locations: Type of Protection - Encapsulation “m” (12.23.01)
2005ISA 60079-18-2005 Electrical Apparatus for Use in Class I, Zone 1 Hazardous (Classified) Locations: Type of Protection Encapsulation"m" Supersedes ANSI/ISA-12.23.01-2002 (IEC 60079-18 Mod) [Superseded: ISA 12.23.01, ISA 12.23.01, ISA S12.23.01]