Specifies requirements for the construction and testing of caplights for use in mines susceptible to firedamp (Group I - electrical apparatus for explosive gas atmospheres as defined in IEC 60079-0). It deals only with the risk of caplight becoming a source of ignition. The requirements of IEC 60079-0 do not apply unless specified. Is also applicable to caplights intended for use in mines which have become temporarily endangered by an explosive atmosphere of firedamp.