Appleton GRH Series Explosionproof Conduit Outlet Box, Malleable Iron

Appleton GRH Series Explosionproof Conduit Outlet Box, Malleable Iron

The Appleton GRH Series conduit outlet box is an explosionproof, dust-ignitionproof fitting built with a malleable iron body for use in indoor and outdoor classified (hazardous) locations. Furnished with an internal ground screw and O-ring, these corrosion-resistant boxes provide access for maintenance, allow connection of different lengths of conduit, and permit changes in conduit direction, all while carrying a NEMA 3, 4 environmental rating.

Key Features

• Explosionproof, Dust-Ignitionproof: Rated for use in Class I, Groups A, B, C, and D; Class II, Groups E, F, and G; and Class III hazardous locations.
• Durable Construction: Malleable iron bodies deliver high tensile strength and ductility, with strong resistance to corrosion, impact, and shock.
• Internal Ground Screw: Standard on every unit for reliable grounding continuity.
• Tapered Hub Threads: Accurately tapped, tapered hub threads produce tight, rigid joints and dependable ground continuity with threaded metal conduit.
• Raintight O-Ring Seal: Standard O-rings provide a raintight fit backed by a NEMA 3, 4 rating.
• Internally Threaded Body: Pairs with an externally threaded cover; each box is furnished complete with its cover.
• Protected Conductors: A smooth, rounded integral bushing in each hub protects conductor insulation during pulls.
• General-Purpose Wiring: Designed for use with threaded metal conduit in general-purpose wiring applications.

Certifications & Compliance

• Class I, Division 1 and 2, Groups A, B, C, D
• Class II, Division 1 and 2, Groups E, F, G
• Class III
• NEMA 3, 4

Technical Specifications

• Refer to manufacturer documentation for complete technical specifications.

Typical Applications

• Indoor and Outdoor Classified Hazardous Locations
• Class I, II, and III Hazardous Location Installations
• Threaded Metal Conduit Systems for General-Purpose Wiring
• Conduit Direction Changes and Maintenance Access Points

Why Appleton?

Appleton engineers the GRH Series with malleable iron construction and a triple-coat finish process for lasting corrosion resistance in demanding classified environments. Combined with an internal ground screw, raintight O-ring sealing, and explosionproof, dust-ignitionproof performance across Class I, II, and III locations, GRH boxes deliver code-compliant reliability for professional electrical installations.

GRH body-style key: Appleton's GRH family covers several distinct body shapes sharing the same cover/capacity spec — Type LB (this listing, GRHLB) is a back-outlet body style, the same "LB" shape convention used industry-wide for conduit bodies; Type L (see the separate GRHL listing) is a different body configuration. If you're not sure which body shape your run needs, compare the two listings before ordering — they are not the same part at a different size.