5. Envelope. External links

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 5