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Electrical Conduit Fittings, Organized by System

Every conduit fitting question starts the same way: which raceway system are you running, and what does the connection need to do? The matrix below crosses the four common systems against the connection types, so you can go straight from the print to the parts list. All standard trade sizes from 1/2 in through 4 in are covered in this category.

Conduit SystemJoining RunsEntering a Box or EnclosureWet Location ChoiceNotes
EMTSet-screw or compression couplingsSet-screw or compression connectors with locknutsRaintight compression fittings, listed for wet locationsThe workhorse of light commercial interiors; set-screw is fine indoors, compression where vibration or moisture is a factor
Rigid / IMCThreaded couplings; three-piece (Erickson) couplings where neither pipe can turnThreaded hubs, or locknut and bushing at knockoutsThreaded hubs with sealing rings (Myers style)Threads are the standard for industrial and exterior work needing maximum physical protection
PVCSolvent-weld couplingsTerminal adapters, male or femaleSolvent-welded joints are inherently sealed; use listed expansion fittings on long exposed runsThe direct-burial and concrete-encased standard for site and landscape circuits
Liquidtight flexNot typically coupled; run in continuous lengthsLiquidtight connectors, straight and angledLiquidtight connectors listed for wet locationsThe final connection to motors, HVAC equipment, transformers, and vibrating gear

Beyond the matrix, this category carries the completion hardware every conduit job consumes: locknuts, grounding and insulated bushings, chase nipples, reducing washers, squeeze connectors for flexible metal conduit, and elbows in standard sweeps.

NEC Notes That Save an Inspection

Three code points account for most fitting-related red tags. First, wet locations: fittings installed outdoors or in washdown areas must be listed raintight or wet location rated, which in practice means compression-type EMT fittings or threaded hubs, not set-screw hardware. Second, grounding continuity: metallic conduit usually serves as the equipment grounding path, so fittings must be made up tight, and concentric or eccentric knockouts may require bonding bushings or jumpers to maintain the path. Third, conductor protection: where conductors 4 AWG and larger enter an enclosure, the NEC requires an insulated throat fitting or insulating bushing to protect insulation at the entry.

Choosing Between Set-Screw and Compression

For dry interior EMT work, set-screw fittings install faster and cost less, which is why they dominate tenant buildouts and lighting circuits. Compression fittings earn their premium in three situations: damp or wet locations where raintight listing is required, installations subject to vibration, and anywhere the AHJ requires concrete-tight construction. Steel fittings take rough service better; die-cast zinc runs cheaper for volume interior work. When a job crosses systems, for example PVC risers transitioning to EMT overhead, transition couplings in this category bridge the two without improvised stacking of adapters.

Boxes and Support to Finish the Raceway

Fittings terminate into boxes, so spec them together. Browse Metallic Boxes and Accessories for interior conduit work and Plastic Boxes for nonmetallic systems. Outdoor terminations pair raintight fittings with our Weatherproof Boxes and In-Use Covers, the companion category for any wet location circuit. Straps, hangers, and rod hardware are in Raceway Support and Box Positioning, and the full department is at Boxes and Fittings. Buying fittings by the box for a project? Ask for contractor volume pricing on the sizes your takeoff calls for.

Frequently Asked Questions

Set-screw fittings clamp the conduit with screws and are the fast, economical choice for dry interior work. Compression fittings seal with a compression ring and are listed raintight for damp and wet locations, and hold better under vibration. Outdoors or in washdown areas, compression or threaded fittings are the code-compliant choice.

No. Outdoor and other wet locations require fittings listed as raintight or wet location rated, which set-screw EMT fittings are not. Use compression-type EMT fittings, threaded rigid conduit hubs, or liquidtight connectors depending on the raceway. This is one of the most common fitting-related inspection failures.

The main families are couplings, which join two lengths of conduit; connectors, which terminate conduit into a box or enclosure; elbows and sweeps for direction changes; and completion hardware such as locknuts, bushings, chase nipples, and reducing washers. Each conduit system, EMT, rigid, PVC, and liquidtight, has its own versions.

Liquidtight connectors terminate liquidtight flexible conduit into equipment enclosures while sealing against water and oils. They are the standard final connection to motors, HVAC condensers, pumps, and transformers, where vibration rules out rigid connections and the location is damp or wet. Straight, 45 degree, and 90 degree bodies are available.

Metallic conduit systems commonly serve as the equipment grounding conductor, and listed metallic fittings maintain that continuity when made up wrench-tight. Where knockouts are concentric or eccentric, or where the AHJ requires it, add bonding bushings or bonding jumpers to preserve the ground path through the enclosure.

A three-piece coupling for rigid or IMC conduit used where neither conduit can be rotated, such as joining two installed runs. The three-piece design threads together in place without turning the pipe. It is the standard fix for closing up a threaded system mid-run without running thread on site.

The NEC requires insulated throat protection where conductors 4 AWG and larger enter an enclosure, protecting insulation from abrasion on the fitting edge. Many contractors standardize on insulated throat connectors for feeder work regardless of size, since the cost difference is small and it removes an inspection variable.

Standard trade sizes run 1/2 inch through 4 inch, matching the conduit sizes used in commercial and industrial work. The most consumed sizes on lighting and branch circuit jobs are 1/2, 3/4, and 1 inch. Always match the fitting to both the trade size and the conduit type, since EMT, rigid, and PVC fittings are not interchangeable.