CODES OF PRACTICE
In Europe the latest industry standard or Code of Practice for the classification of Explosive Atmospheres is EN 60079-10 (See also IEC 60079-10). Similarly the code of practice for the selection, installation, and maintenance of electrical apparatus in flammable atmospheres can be found under EN 60079-14 (See also IEC 60079-14).
Codes of practice in the USA & Canada, which have differed largely from the unified EN & IEC standards, define the permitted use of electrical equipment and approved wiring methods in industry. The standard reference document for electrical installation is the National Electric Code (NEC) in USA and the Canadian Electric Code (CEC) in Canada.