Table of Contents
Type px or type py pressurisation #
The temperature class shall be based on the higher of the hottest external surface of the enclosure or the hottest internal component surface.
Internal components may exceed the enclosure T-class if the enclosure is marked with the time for them to cool to the T-class.
Type pz pressurisation #
The temperature class shall be based on the hottest external surface of the enclosure, taking into account internal Ex equipment remaining energised in the absence of over-pressure.
