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