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Issue 04/2017

The hazardous world of Ex Marking

Coding for equipment used in explosive atmospheres

This article was first published in HazardEx on 20 April 2017 - subheadings and "About IECEx" section were inserted editorially by IEC

The one subject guaranteed to get everyone hot under the collar is the subject of the marking of Ex Equipment. There is not much disagreement about the need to identify the equipment type, its operational parameters and its manufacturer, but everyone seems to have an opinion on how the hazardous area code should be expressed. The discussions at the recent IEC TC 31: Equipment for explosive atmospheres, standards meetings in Sydney, Australia, were no exception, and we will return to this later. But first, we need an historical perspective.