CAN/CSA-E60079-11:02 (R2011)

This National Standard of Canada is based on International Standard CEI/IEC 60079-11:1999. 1 Scope 1.1 This part of IEC 60079 specifies the construction and testing of intrinsically safe apparatus, intended for use in potentially explosive atmospheres and for associated apparatus, which is intended for connection to intrinsically safe circuits which enter such atmospheres. It also contains details of the test apparatus previously published as IEC 60079-3. 1.2 This standard supplements IEC 60079-0:1998, the requirements of which apply to intrinsically safe apparatus and to associated apparatus except as indicated in the following list. If associated apparatus is protected by a type of protection listed in IEc 60079-0 then the requirements of that method of protection together with the relevant parts of IEC 60079-0 also apply to the associated apparatus. The list of exclusions which follows is directly applicable to associated apparatus intended for use in situations where there is no potentially explosive atmosphere and in other circumstances should be used in combination with the requirements of the other methods of protection. Clause or subclause excluded Clause of IEC 60079-0:1998 Intrinsically Associated safe apparatus apparatus 3.1 Electrical apparatus Yes Yes 4.2.2 Marking of maximum surface temperature No Yes 5.1 Maximum surface temperature No Yes 5.3 Surface temperature and ignition temperature No Yes 6.2 Enclosure opening delay Yes Yes 7.1.1 Definition of plastics material No Yes 7.1.2 Requirement of plastics material Yes Yes 7.1.3 Verification of plastics material compliance No Yes 7.2 Thermal endurance Yes Yes 7.3 Electrostatic charges on plastics enclosures No Yes 7.3.1 Electrical apparatus of Group I Yes Yes (notes 1 and 2 only) 7.3.2 Electrical apparatus of Group II Yes Yes (notes 1 and 2 only) 7.4 Threaded holes in plastics Yes Yes 8.1 Light metal enclosure materials No Yes 8.2 Threaded holes in light metals Yes Yes 9 Fasteners Yes Yes 10 Interlocking devices Yes Yes 11 Bushings Yes Yes 12 Materials used for cementing Yes Yes 14 Connection facilities and terminal compartments Yes Yes 15 Connection facilities for earthing or bonding conductors Yes Yes 16 Cable and conduit entries Yes Yes 17to 22 Supplementary requirements for certain electrical apparatus Yes Yes 23.4.3.1Test for resistance to impact Yes Yes 23.4.3.2Drop test (no prior impact test necessary) No Yes 23.4.3.3Required results No Yes 23.4.5 Torque test for bushings Yes Yes 23.4.6.1Temperature measurement No Yes 23.4.6.2Thermal shock test Yes Yes 23.4.7.1 to 23.4.7.7Tests on non-metallic enclosures Yes Yes 23.4.7.8Insulation resistance test of parts of enclosures of plastics materials No Yes 27.7 Examples of marking Yes Yes Annex B Ex cable entries Yes Yes 1.3 This standard is applicable to electrical apparatus in which the electrical circuits themselves are incapable of causing an explosion in the surrounding explosive atmospheres. 1.4 This stan