Envelope. External links
Electrical equipment in potentially explosive atmospheres. Intrinsic safety

The printed circuit board must be housed in an enclosure with at least IP 20 protection (determined in accordance with EN 60529).

Figure 16 shows a possible layout which, in addition to complying with the requirements of Table 5 , must also meet the following rules: the connection terminals of intrinsically safe circuits must be separated from the connection terminals of non-intrinsically safe circuits by one or more of the methods described in this paragraph ...