NFPA 496 Type Y & Z Enclosure Purge Units Description
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Our CEO developed the concept of “Rapid Exchange” in 1985, and our original enclosure vents featured a brass swing-check valve and a PVC pipe cap. Our vents are now more advanced, but many Units with those vents sporting brass valves and PVC caps are still in service today! Look around, and you might just find one!
Best Purging Systems Type Y and Z Purge Units protect electrical equipment in Class I Hazardous Locations. When connected to a supply of protective gas these models will supply, regulate and monitor the protective gas supply to a protected enclosure; and are UL listed and designed to meet or exceed NEC – NFPA 70, NFPA 496, EN 50016 and IEC 60079-02 requirements.
Each Unit features a regulator that supplies a needle valve and ball valve in parallel to set enclosure pressure and purge enclosures quickly, when required during start-up. In addition, a color-coded analog differential pressure indicator is provided to displays enclosure pressure. Our Vertical and Horizontal Configuration Units also feature a Differential Pressure Switch available in several styles to provide a signal to indicate enclosure pressure loss.
When utilized for Type Z applications, these Units reduce the hazardous location rating inside the enclosure from Division 2/ Zone 2 to non-hazardous. This allows non-rated equipment to operate in Division 2/ Zone 2 areas.
When utilized for Type Y applications, these Units reduce the hazardous location rating inside the enclosure from Division 1/ Zone 1 to Division 2 / Zone 2. This allows Division 2/ Zone 2 equipment to operate in Division 1/ Zone 1 areas.
IMPORTANT NOTE: Model PV Spark Arresting Purge Vents installed on the protected enclosure are required for safe operation.
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