Technical Foundation
What Is a Conduit Fitting?
A conduit fitting joins conduit sections to each other, to enclosures, or transitions between conduit types, while maintaining the raceway's mechanical protection and, for metallic systems, its role as an equipment grounding path. Connection styles differ by conduit type: EMT (thin-wall) uses set-screw or compression fittings since it can't be threaded; rigid metal conduit (RMC) and intermediate metal conduit (IMC) use threaded fittings cut directly into the conduit wall; liquidtight flexible conduit uses compression fittings with a sealing ferrule.
Fitting selection also depends on environment — compression fittings are specified over set-screw in wet, outdoor or corrosive locations because the compression ring forms a tighter mechanical and moisture seal, while set-screw fittings are the economical standard for dry indoor commercial work. All fittings must be listed for the conduit type and, where required, the environment (NEMA/UL wet-location rating) per the applicable electrical code.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Conduit Type | EMT, rigid (RMC), IMC, liquidtight flex (LFMC/LFNC) | Fitting connection style is specific to the conduit wall type and threading |
| Trade Size | 1/2 in to 4 in (metric equivalents available) | Must match the conduit's nominal trade size exactly, not outer diameter |
| Connection Style | Set-screw, compression, threaded | Compression suits wet/outdoor locations; set-screw is standard for dry indoor runs |
| Material | Zinc die-cast, steel, malleable iron, aluminum | Determines corrosion resistance and compatibility with the conduit material |
| Listing/Rating | UL 514B, NEMA wet-location rating | Required for code compliance in the specified installation environment |
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Applications
Where Conduit Fittings Get Used
Conduit fittings are specified anywhere metallic or liquidtight raceway needs to be joined, terminated, or transitioned per electrical code.
Commercial & Industrial Electrical Installation
Joining EMT and rigid conduit runs throughout building electrical distribution systems per code.
Outdoor & Wet-Location Wiring
Compression and liquidtight fittings specified where moisture ingress would compromise a set-screw connection.
Hazardous Location Installations
Threaded rigid conduit fittings used where explosion-proof raceway integrity is required by classification.
Machine & Equipment Wiring
Liquidtight flexible conduit fittings connecting fixed conduit to vibrating or moving machine components.
Data Center & Telecom Infrastructure
EMT conduit systems protecting low-voltage and power cabling runs between equipment rooms.
Renovation & Tenant Improvement
Conduit body fittings (LB, T, C) enabling direction changes without pulling new conduit runs.
FAQ
Conduit Fittings Questions, Answered
What's the difference between set-screw and compression EMT fittings?
Set-screw fittings grip the conduit with one or two screws biting into the tubing wall — economical and standard for dry, indoor commercial work. Compression fittings use a tightened ring that forms a stronger mechanical grip and better moisture seal, and are typically required or preferred for outdoor, wet, or concrete-encased installations.
Can I mix EMT fittings with rigid conduit?
No — EMT fittings are sized and shaped for EMT's specific wall thickness and outer diameter, and won't properly grip or seal rigid or IMC conduit, which has different dimensions and is meant to be threaded. Use a listed adapter fitting to transition between conduit types.
Do conduit fittings need to be listed or rated for a specific environment?
Yes. Fittings must carry a UL listing appropriate to the conduit type, and for wet or outdoor locations must carry a wet-location or NEMA rating; using an indoor-rated fitting outdoors is a common code violation caught during inspection.
What is a conduit body (LB, T, C) used for?
Conduit bodies provide an access point and direction change in a conduit run — an LB turns a run 90° while allowing wire pulling access via a removable cover, avoiding the bend radius and pulling tension issues of a factory conduit elbow on longer runs.
How do I size a conduit fitting correctly?
Match the fitting's trade size to the conduit's nominal trade size (1/2in, 3/4in, 1in, etc.), not the conduit's actual outer diameter — trade sizes are nominal designations, not measured dimensions, and using outer diameter to select a fitting will result in a poor fit.
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