An HMI can be built into any NEMA 12, NEMA 4 or NEMA 4X enclosures, depending on the operating environment. NEMA 12 suits indoor dust and drip areas, while NEMA 4 and 4X add hose-down and corrosion resistance. The panel’s overall type rating accounts for the HMI cutout and any device mounted through the door.
NEMA enclosure ratings match the panel to its environment:
- NEMA 12, an indoor rating, protects the HMI against falling dust, dirt and dripping non-corrosive liquids on a plant floor.
- NEMA 4, a watertight rating, withstands hose-directed water and washdown, common on food and beverage lines.
- NEMA 4X adds corrosion resistance, using stainless steel or polycarbonate for chemical, marine or sanitary areas.
HMI bezel gasketing maintains the enclosure rating at the screen cutout, the most common point where a rating is lost. If the panel mounts in a washdown zone, then a NEMA 4X enclosure with a sealed HMI bezel keeps the rating intact during cleaning.
An HMI can be built into NEMA 12, 4 or 4X enclosures, depending on dust, washdown and corrosion exposure risk in the planned environment. An HMI control panel is rated NEMA 12, 4 or 4X to match dust, washdown and corrosion exposure on the line. See where those ratings matter most on our Pump Control Panels page.
