60079-26-2004 Matériel électrique pour atmosphères explosives gazeuses – Partie 26: Construction@ essais et marquage des matériels électriques de Groupe II utilisables en Zone 0 (Edition 1.0)
Electrical apparatus for explosive gas atmospheres – Part 26: Construction@ test and marking of Group II Zone 0 electrical apparatus (Edition 1.0)
Matériel électrique pour atmosphères explosives gazeuses – Partie 26: Construction@ essais et marquage des matériels électriques de Groupe II utilisables en Zone 0 (Edition 1.0) 是非强制性国家标准，您可以免费下载前三页
This part of IEC 60079 specifies the particular requirements for construction@ test and marking for electrical apparatus of Group II intended for use in Zone 0 as defined in IEC 60079-10.This electrical apparatus@ within the operational parameters specified by the manufacturer@ ensures a very high level of protection that includes rare faults related to the apparatus or two faults occurring independently of each other.NOTE 1 A malfunction may result from a failure of the component parts of the electrical apparatus or from anticipated externally applied influences. Two independent malfunctions which may occur more frequently and which@ separately@ would not create an ignition hazard but which@ in combination@ could create a potential ignition hazard@ should be regarded as occurring together to form a rare fault.This electrical apparatus is intended for use in Zone 0 hazardous areas@ in which explosive gas atmospheres caused by mixtures of air and gases@ vapours or mists under normal atmospheric conditions are present continuously@ for long periods or frequently.This standard also applies to apparatus mounted across the boundary between Zone 0 and Zone 1.EXAMPLE: In the wall of a storage vessel.This standard also applies to apparatus installed outside Zone 0@ but electrically connected to apparatus inside Zone 0 (associated apparatus).This standard supplements the general requirements in IEC 60079-0 and the requirements of the standardized types of protection@ in accordance with the IEC 60079 series@ to adapt the level of safety provided by those standards to the very high level of risk in Zone 0.NOTE 2 In designing apparatus for operation in explosive gas atmospheres under conditions other than the atmospheric conditions given in IEC 60079-0@ this standard may be used as a guide. However@ additional testing is recommended related specifically to the intended conditions of use. This is particularly important when the types of protection ??Flameproof enclosure?? (IEC 60079-1) and ??Intrinsic safety?? (IEC 60079-11) are applied.NOTE 3 The classification of hazardous areas in zones is defined in IEC 60079-10.NOTE 4 There may be other non-electrical sources of ignition (for example ultrasonic@ optical or ionizing radiation) that are not addressed by this standard; these should also be taken into consideration (see@ for example@ EN 1127-1).