Electrical conduit protects conductors and provides a defined pathway between panels, boxes, equipment and devices. The correct conduit system depends on where the wiring will be installed, how much physical protection is required and whether the raceway will be exposed to moisture, corrosion or impact.
CAPO Supply carries common conduit products and fittings for residential, commercial and industrial electrical work, including PVC conduit, EMT and rigid metal conduit.
Why Electrical Conduit Is Used
Conduit helps protect electrical wiring from physical damage and keeps conductors organized throughout a building or site.
Common conduit applications include:
- Service entrances
- Panel feeders
- Commercial branch circuits
- Underground wiring
- Outdoor equipment
- Garages and workshops
- Industrial machinery
- Rooftop equipment
- Exposed interior wiring
A complete conduit installation also requires the proper couplings, connectors, elbows, bushings, straps, boxes and other fittings for the selected raceway.
PVC Electrical Conduit
PVC conduit is a nonmetallic raceway commonly used underground, outdoors and in locations where resistance to moisture and corrosion is important.
Typical applications include:
- Underground feeders
- Residential service entrances
- Detached garages and outbuildings
- Outdoor lighting
- Landscape equipment
- Commercial site work
- Wet or corrosive environments
- Concrete-encased raceways
PVC conduit is lightweight and easy to cut and assemble. Connections are generally made with approved fittings and solvent cement.
Because PVC is nonmetallic, it does not provide a grounding path by itself. A separate equipment-grounding conductor may be required inside the raceway, depending on the installation.
PVC also expands and contracts with temperature changes. Long exposed runs may require expansion fittings to reduce stress on boxes, fittings and equipment.
EMT Conduit
Electrical metallic tubing, commonly called EMT, is a thin-wall metal raceway widely used in commercial buildings and exposed interior installations.
Typical EMT applications include:
- Offices
- Retail spaces
- Warehouses
- Workshops
- Utility rooms
- Exposed basement wiring
- Commercial branch circuits
- Light industrial installations
EMT is lighter than rigid metal conduit and can be bent in the field with the proper tools. When installed neatly, it provides a clean and professional appearance.
EMT systems use listed compression or set-screw fittings. The fitting style should match the environment and whether the installation is in a dry, damp or wet location.
When the complete raceway system is properly installed and approved for the application, EMT may serve as an equipment-grounding path. Some projects may still specify a separate grounding conductor.
Rigid Metal Conduit
Rigid metal conduit provides a high level of mechanical protection and is commonly used in demanding commercial, industrial and outdoor installations.
Typical applications include:
- Service entrances
- Industrial facilities
- Manufacturing equipment
- Utility installations
- Outdoor exposed wiring
- Rooftop equipment
- Areas subject to impact
- Heavy commercial construction
Rigid conduit has a thicker wall than EMT and usually has threaded ends. Sections are joined with threaded couplings and connected to boxes and equipment with compatible fittings.
Its durability makes it a strong choice where wiring may be exposed to severe physical damage. It is heavier and more labor-intensive to bend and install than EMT, but it provides superior protection in harsh environments.
PVC vs. EMT vs. Rigid Conduit
Each conduit type is suited to a different set of applications.
Choose PVC when:
- The raceway will be installed underground
- Corrosion resistance is important
- A lightweight nonmetallic system is preferred
- The installation will be exposed to moisture
- Concrete encasement or direct burial is involved
Choose EMT when:
- The installation is indoors or in an approved exposed location
- A clean commercial appearance is desired
- Field bending and fast installation are priorities
- Moderate mechanical protection is sufficient
- The project involves branch circuits or equipment feeds
Choose rigid metal conduit when:
- Maximum mechanical protection is required
- The raceway may be exposed to impact
- The installation involves service equipment
- Heavy commercial or industrial conditions are present
- Threaded metal raceway is specified
The correct choice depends on the complete installation rather than material cost alone.
Conduit Size and Wire Fill
Conduit must be large enough for the quantity and size of the conductors installed inside it.
Selection should consider:
- Number of conductors
- Conductor size
- Insulation type
- Required wire fill
- Pulling distance
- Number of bends
- Future circuit capacity
- Equipment connection size
A properly sized raceway makes conductor pulling easier and can provide room for future changes.
Bends and Pulling Access
Too many bends between pull points can make conductor installation difficult and may damage the wire during pulling.
Junction boxes, pull boxes and conduit bodies provide access where direction changes or pulling distances require it. Bends should be smooth and properly formed. Flattened or damaged conduit can reduce usable space and make installation more difficult.
Matching Fittings to the Conduit
Conduit fittings are not universally interchangeable. Each raceway requires fittings specifically designed and listed for that conduit type.
Common conduit accessories include:
- Couplings
- Connectors
- Elbows
- Bushings
- Locknuts
- Conduit bodies
- Straps and hangers
- Expansion fittings
- Sealing fittings
- Junction and pull boxes
The fitting material and rating should match both the conduit and the installation environment.
Complete Conduit Systems from CAPO Supply
A properly selected conduit system protects conductors, supports safe maintenance and creates a durable pathway for electrical circuits.
Whether a project requires PVC for underground work, EMT for exposed commercial wiring or rigid conduit for heavy-duty protection, CAPO Supply can help contractors assemble the complete raceway system.
Contact CAPO Supply for current conduit availability, fittings, elbows, boxes and assistance selecting the materials needed for your next electrical project.