IEC 60079-27 pdf download Explosive atmospheres – Part 27: Fieldbus intrinsically safe concept (FISCO) 1 Scope This part of IEC 60079 contains the details of apparatus, systems and installation practice for use with the Fieldbus Intrinsically Safe Concept (FISCO). It is based on the concepts of Manchester encoded, bus powered systems designed in accordance with IEC 61 1 58-2 which...