Because of the vented spring chamber
7 A @ 208/230 V (Single-Phase) Standards CSA
User-Adjustable Item Multi-Gas Detector Battery Life 13 hr Alarm Setting Carbon Monoxide (35 or 200 ppm)
2 in (30 mm) Safety Rating CAT III 1000V
IP Rating IP14
Hubbell VR341 Pin and Sleeve Receptacle 30 A, 600V AC/250V DC, Style 1 Grounding, Gray, Receptacle Only, Grounded 34GM78 Because of the vented springPin and Sleeve Receptacle, Current Rating 30 A, Flange Type Flanged, Grounding Style Style 1, Hazardous Location Specification Not Applicable, IP Rating Not Rated, NEMA Enclosure Rating 4X, Number of Gangs 1, Number of Poles 4, Number of Wires 4, Phase Three, Shrouded Yes, Voltage Rating 600V AC 250V DC, Cap Type Flip Up and Screw Cap, Connection Orientation Straight, Grounding Grounded, Housing Color Gray, Housing Material Copper Free Aluminum,