Constructional requirements for intrinsically safe apparatus

Constructional requirements for intrinsically safe and associated apparatus refer to all components and provisions related to intrinsic safety - i A complete description of these constructional requirements would go beyond the scope of this chapter. So, only the requirements which are essential for a better understanding are mentioned and described in brief. 

As mentioned above, fault analysis is of central significance the number of (countable) faults determines the category of an apparatus. The correlation 

A component, assembly of components, interconnection, separations is. .. infallible. ..fallible 

Zener diodes for voltage limitation imposed with = 2/3 of its rated value arbitrary interconnection/ interruption within an integrated circuit 

For intrinsically safe circuits, a basic protection measure is a safe isolation from all other non-intrinsically safe circuits. With the exception of safety barriers a safe galvanic isolation is required. As a rule, this is guaranteed by observance of geometrical distances. It is differentiated between  

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