This part of 60079 specifies the construction and testing of intrinsically safe apparatusintended for use in an explosive gas atmosphere and for associated apparatus, which isintended for connection to intrinsically safe circuits which enter such atmospheres.This type of protection is applicable to electrical apparatus in which the electrical circuitsthemselves are incapable of causing an explosion in the surrounding explosive atmospheres.This standard is also applicable to electrical apparatus or parts of electrical apparatus locatedoutside the explosive gas atmosphere or protected by another type of protection listed in 60079-0, where the intrinsic safety