IEC 60079-11:2011 PDF Download

IEC 60079-11:2011 is a standard that provides guidelines for the construction and testing of intrinsically safe apparatus that can be used in explosive atmospheres. It covers both intrinsically safe equipment and associated apparatus that are intended to be connected to intrinsically safe circuits in such environments. This standard ensures that the electrical equipment does not have the potential to cause an explosion in the surrounding explosive atmospheres.

The standard is applicable to electrical equipment located both inside and outside the explosive atmosphere, as long as the intrinsic safety of the electrical circuits in the explosive atmosphere relies on the design and construction of the equipment. It evaluates the electrical circuits exposed to the explosive atmosphere to ensure their safe use in such environments.

IEC 60079-11:2011 is a supplement to the general requirements of IEC 60079-0, unless stated otherwise in Table 1. In case of conflicts between the requirements of this standard and IEC 60079-0, the requirements of IEC 60079-11 take precedence.

This sixth edition of the standard includes significant changes compared to the previous edition. These changes include the inclusion of references to IEC 60079-0, merging the apparatus requirements for Fieldbus Intrinsically Safe Concept (FISCO), merging requirements for combustible dust atmospheres, clarifying requirements for accessories connected to intrinsically safe apparatus, adding new test requirements for opto-isolators, and introducing Annex H about ignition testing of semiconductor limiting power supply circuits.

This edition of the standard also includes the contents of various corrigenda and interpretation sheets that have been issued since its initial publication.