This part of IEC 60079-35 specifies requirements for the construction, testing and marking of caplights, including caplights with a point of connection for other equipment, for use in mines susceptible to firedamp (Group I – electrical equipment for explosive gas atmospheres as defined in IEC 60079-0). It deals only with the risk of the caplight becoming a source of ignition. The requirements for performance are in IEC 60079-35-2.1 This standard supplements and modifies the general requirements of IEC 60079-0 except as indicated in Table 1. Where a requirement of this standard conflicts with a requirement of IEC 60079-0, the requirements of this standard take precedence. Compliance with this standard will provide an EPL of Mb (see 4.1 of this standard). If an EPL of Ma is required, the caplight will need to conform to the requirements of 4.2 of this standard, which in turn refers to IEC 60079-11. It is expected that from time to time, caplights conforming to this standard (EPL Mb) will operate in atmospheres where the firedamp exceeds statutory levels that require the withdrawal of people from the high firedamp atmosphere to a non-hazardous area. In designing equipment for operation in conditions other than those given above, this standard may be used as guidance; however, additional testing may be required. Where a caplight is assessed as intrinsically safe equipment, Ex ia, conforming to IEC 60079-11 only the clauses/subclauses listed in 4.2 require application. Table 1 – Application or exclusion of specific clauses of IEC 60079-0 Clause of IEC 60079-0 IEC 60079-0 clause application Ed. 5.0a (2007) Ed. 6.0a (2011) Clause/subclause title (normative) 1 1 Scope Applies 2 2 Normative references Applies 3 3 Terms and definitions Applies 4 4 Equipment grouping Applies 5 5 Temperatures Applies 6.1 6.1 Requirements for all equipment – General Applies 6.2 6.2 Requirements for all equipment – Mechanical strength of equipment Applies 6.3 6.3 Requirements for all equipment – Opening times Excluded 6.4 6.4 Requirements for all equipment – Circulating currents Excluded 6.5 6.5 Requirements for all equipment – Gasket retention Applies 6.6 6.6 Requirements for all equipment – Electromagnetic and ultrasonic energy radiating equipment Applies 7 7 Non-metallic enclosures and non-metallic parts of enclosures Applies 8 8 Metallic enclosures and metallic parts of enclosures Applies 9 9 Fasteners Applies 10 10 Interlocking devices Applies 11 11 Bushings Excluded 12 12 Materials used for cementing Applies 13 13 Ex components Applies 14 14 Connection facilities and terminal compartments Applies 15 15 Connection facilities for earthing or bonding conductors Excluded 16 16 Entries into enclosures Applies 17 17 Supplementary requirements for rotating electrical machines Excluded 18 18 Supplementary requirements for switchgear Excluded 19 19 Supplementary requirements for fuses Excluded 20 20 Supplementary requirements for plugs and socket outlets and connectors Applies 21 21 Supplementary requirements for luminaires Excluded 22 22 Supplementary requirements for caplights and handlights Applies 23 23 Equipment incorporating cells and batteries Modified 24 24 Documentation Applies 25 25 Compliance of prototype or sample with documents Applies 26.1 26.1 Type tests – General Applies 26.2 26.2 Type tests – Test configuration Applies 26.3 26.3 Type tests – Tests in explosive test mixtures Applies 26.4 26.4 Type tests – Tests of enclosures Modified 26.5.1 26.5.1 Thermal tests – Temperature measurement Applies 26.5.2 26.5.2 Thermal tests – Thermal shock test Applies 26.5.3 26.5.3 Thermal tests – Small component ignition test Applies 26.6 26.6 Torque tests for bushings Excluded 26.7 26.7 Non-metallic enclosures or non-metallic parts of enclosures Applies 26.8 26.8 Thermal endurance to heat Applies 26.9 26.9 Thermal endurance to cold Applies 26.10 26.10 Resistance to light Excluded 26.11 26.11 Resistance to chemical agents for Group I electrical equipment Applies 26.12 26.12 Earth continuity Excluded 26.13 26.13 Surface resistance of parts of enclosures of non-metallic materials Applies 26.14 NR Charging tests Applies 26.15 26.14 Measurement of capacitance Applies NR 26.15 Verification of ratings of ventilating fans Excluded NR 26.16 Alternative qualification of elastomeric sealing O-rings Applies 27 27 Routine tests Applies 28 28 Manufacturer\'s responsibility Applies 29 29 Marking Modified 30 30 Instructions Applies Applies – This requirement of IEC 60079-0 is applied without change. Excluded – This requirement of IEC 60079-0 does not apply. Modified – This requirement of IEC 60079-0 is modified as detailed in this standard. NR – No requirements. a The clause number in this table is shown for information only. The applicable requirements of IEC 60079-0 are identified by the clause title which is normative. This table was written against the specific requirements of the sixth edition of IEC 60079-0:2011. The clause numbers for the previous edition are shown for information only. This is to enable the General requirements of the fifth edition of IEC 60079-0:2007 to be used where necessary with this part of IEC 60079. Where there were no requirements (indicated by NR) or there is a conflict between requirements, the later edition requirements take precedence.