Thomas & Betts IH3-1-LM Device Boxes, Covers & Accessories, 100 Pack

Not by itself. The IH3-1-LM is rain tight only when it is paired with the appropriate Red Dot cover, so the cover is part of the weather rating, not an accessory you can skip. With the right cover, this style of dry-tite box and cover protects wiring devices, switches, electronic components and terminal blocks in dry, damp and wet locations. Order the cover alongside the box if the opening is exposed.

The IH3-1-LM is a single-gang box with 17 cubic inches of volume, and the cubic content is cast right into the box so an inspector can read it. Box fill is figured against that 17 cubic inches using the conductor volume allowances in your local code, with deductions for the device, clamps and grounds. For a single receptacle or switch with 12 AWG branch wiring, that is a comfortable working volume for a splice point.

The IH3-1-LM is built from die cast aluminum, alloy A380, with certified zinc alloy hardware and stainless steel springs for corrosion resistance, and it is finished powder-coated in silver. That combination is what makes it a common choice for exterior walls, wash-down areas and industrial plants where a steel box would rust out. It is not a classified explosionproof enclosure; for hazardous locations you want a malleable iron explosionproof box such as the Appleton GRJ or GRJS Series.

For classified areas, specify an explosionproof box instead. The Appleton GRJ Series conduit outlet box and the Appleton GRJS Series universal conduit outlet box are explosionproof malleable iron boxes built for that duty. The IH3-1-LM is a die cast aluminum device box intended for dry, damp and wet locations, and is rain tight when used with appropriate Red Dot covers.

Mounting lugs are cast into the IH3-1-LM, so it screws directly to a wall, a post, a strut or a structural surface without a separate bracket or a wall plate. The lugs accept several mounting methods, and the internal device mounting plates are factory fastened so the device sits square. You still supply your own fasteners sized to the substrate.

The body of the IH3-1-LM runs 4-9/16 by 2-13/16 by 2 inches on the A, B and C spec dimensions, with mounting and hub reference points at 3-13/16, 3-1/2, 3-1/4, 1-7/8 and 1-1/2 inches. Lay those against your stud spacing or strut centers before you commit to a layout; it is a compact single-gang footprint rather than a 4-11/16 square.

Yes. It gives you an accessible wiring chamber for maintaining or changing a system, pulling conductors and making splices, and it works as a junction box for branch conduits. The cast and machined interior surfaces are smooth enough to pull wire against without skinning insulation, which is the practical reason crews use these at conduit turns rather than only at devices.

UL certified and RoHS compliant, with the UL mark and the cubic content cast into the box so a field inspector can verify both without paperwork. That is the detail that matters on institutional and government work where the inspector signs off at the wall, not at the submittal.

Depends on the location. For another die cast aluminum one-gang weatherproof box, the Mulberry Royal Mountie is the closest cross-brand equivalent. Interior residential rough-in in stud walls is cheaper in PVC, like the Cantex EZ Series multi-gang residential box. Classified hazardous areas call for explosionproof malleable iron, the Appleton GRJ, GRJS or round GRT75. A dedicated range or dryer outlet is a different animal entirely, handled by the Pass & Seymour P242RRD thermoplastic range and dryer box.

The IH3-1-LM is a one-gang box, so for two or more devices in a single enclosure look at a multi-gang box such as the Cantex EZ Series PVC multi-gang residential outlet box. Note the change in construction: the Cantex is PVC while the IH3-1-LM is die cast aluminum.

No. The Appleton GRT75 is a malleable iron round conduit outlet box, so it does not provide the rectangular one-gang device opening the IH3-1-LM gives you for mounting a switch or receptacle. The IH3-1-LM is a one-gang die cast aluminum device box with 17 cubic inches of wiring volume. Use the round box for conduit pulls and junctions, not as a drop-in for a device box.

Both are 1-gang die-cast aluminum boxes. The Mulberry Royal Mountie (P473899) is catalogued as a weatherproof outlet box. The Thomas & Betts IH3-1-LM is rain tight when used with appropriate Red Dot covers, so the cover you pair with it determines the outdoor rating; it carries a UL listing and a powder-coated silver finish.

Most leaks come from a pitted or burred cover seating surface that will not let the gasket compress evenly. The IH3-1-LM is machined with clean cover edges specifically so the gasket seals, and the die cast body stays rigid enough not to distort when you torque the cover screws down. Pair it with the matching Red Dot cover and the gasket does its job.

The Thomas & Betts IH3-1-LM is die cast aluminum with a powder-coated silver finish and weighs 0.56 lbs each, with alloy A380 aluminum, certified zinc alloy and stainless steel springs for corrosion resistance. The Cantex EZ Series box is PVC and is catalogued for residential use. Pick the aluminum box where you want a rugged metal enclosure and conduit hubs, and the PVC box where nonmetallic cable and residential framing are the norm.