This protection method prevents the surrounding atmosphere from entering the enclosure by maintaining a positive pressure of protective gas inside the unit, keeping it higher than the external atmosphere.
Purge Types:
- Type X: Converts the internal area from Division 1 to non‑hazardous
- Type Y: Converts the internal area from Division 1 to Division 2
- Type Z: Converts the internal area from Division 2 to non‑hazardous
Local operator panel fitted with Z‑purge to convert the enclosure interior from Division 2 to non‑hazardous, allowing the use of selected non‑incendive components; assembly approved for Class I, Division 2.
Local operator enclosure fitted with Type‑Y purge to convert the internal area from Division 1 to Division 2, allowing the use of readily available Division 2 components; assembly approved for Class I, Division 1.
VFD panel rated for Division 2, fitted with Z‑purge to convert the enclosure interior to non‑hazardous, allowing use of standard VFD components; includes a Division 2–rated air conditioner to manage heat from the drive.