The Type X Purge System

• Class I applications- the Type X purge system operates by forcing air or an inert gas through the enclosure until all of the hazardous gas is removed (purging). After purging, constant pressure is maintained within the enclosure and equipment inside the enclosure is energized. If enclosure pressure drops below its minimum, enclosure power is cut and a purging sequence begins.
• Class II applications- the enclosure must be free of all combustible material. It is pressurized before powering the equipment inside. There is no purging of the Class II, Type X system.
• Vents are required for most Type X purge enclosures.