IEC 60079 -14 Electrical Installations in Hazardous Areas
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Extra info for IEC 60079 -14 Electrical Installations in Hazardous Areas
Example text
Alternatively, testing shall be carried out in a “gas-free” situation. --`,````,,,```,,,,`,,,``,,,,,-`-`,,`,,`,`,,`--- NOTE Whenever portable electrical apparatus is used in a hazardous area, extreme care should be taken to avoid unnecessary risks. Unless specifically permitted by the certification documents for portable electrical apparatus or unless other suitable precautions are taken, spare batteries should not be taken into the hazardous area. 1 Danger from live parts In order to avoid the formation of sparks liable to ignite the explosive gas atmosphere, the possible inadvertent contact with bare live parts other than intrinsically safe parts shall be prevented.
Metallic enclosures of intrinsically safe apparatus need not be connected to the equipotential bonding system, unless required by the apparatus documentation or to prevent accumulation of static charge. Installations with cathodic protection shall not be connected to the equipotential bonding system unless the system is specifically designed for this purpose. NOTE Potential equalization between vehicles and fixed installations may require special arrangements, for example where insulated flanges are used to connect pipelines.
During use, such apparatus should not be transferred from a zone of lower risk to a zone of higher risk unless it is suitably protected for the higher risk. In practice, however, such a limitation may be difficult to enforce; it is recommended, therefore, that all portable apparatus meet the requirements of the highest risk. Similarly, the apparatus group and temperature classification should be appropriate for all the gases and vapours in which the apparatus may be used. Ordinary industrial portable apparatus should not be used in a hazardous area unless the specific location has been assessed to ensure that potentially flammable gas or vapour is absent during the period of use (“gas-free” situation).