Firstly apologies for the lateness of the reply (the post approval process didn't flag this post until after the upgrade so it was missed).
You do need to use use a fitting with an appropriate IP rating for the location, or zone, where it will be placed. The nearer the fitting is to a water source like a shower or bath the higher the rating needs to be. This can range from IP67 for use in Zone 0 (immersed in water like inside a bathtub) to there being no required rating for lights far away in a large bathroom (although IP20 or more is still recommended).
These zones (volumes
) have just been updated in the newest rules. You can see an example of the new zones here
Les nouveaux volumes dans la salle de bain (A5 NF C 15-100)
Anything you fit inside zone 2 or less should be Class II.