What is a Conduit?

Understanding Conduit

Conduit is a raceway that carries electrical wires between two points. It protects conductors from impact, abrasion, moisture, sunlight, heat, and some chemicals. A complete installation includes the raceway, connectors, couplings, bends, supports, and conductors. The raceway itself isn't an electrical circuit. It doesn't replace circuit protection.

Related glossary terms: Branch Circuit, Electrical Code, National Electrical Code.

Common materials include electrical metallic tubing, rigid metal conduit, intermediate metal conduit, flexible metal conduit, and PVC conduit. Metal raceways can provide strength. They may also serve as part of an equipment grounding path. This works when they're installed correctly. PVC doesn't conduct electricity. A separate grounding conductor is normally needed. The correct choice depends on location, exposure, strength, corrosion risk, and local code rules.

How Conduit Works, Is Measured, or Is Used?

Installers first plan the route from a service panel or other source. The route may lead to a junction box, receptacle, light fixture, motor, or equipment connection. They choose a conduit type and trade size for the environment. They also consider the number and size of conductors. The route should avoid extra bends. Each bend makes conductor installation harder. Too many bends may break code limits.

Conduit fill describes how much inside space the conductors use. The National Electrical Code sets fill limits for conductors. These limits depend on their number, size, and insulation type. Installers also check bend radius, support spacing, connector fit, box volume, and pulling tension. A typical installation uses a conduit cutter or saw, reamer, bending tool, fish tape, approved fittings, and a torque tool when required.

• Measure the route and count every bend, box, and fitting.
• Choose a trade size that meets fill and pulling needs.
• Remove sharp edges so insulation doesn't get damaged.
• Secure the raceway and bond metal parts when the code requires.

Why Conduit Matters?

Wire protection is the main reason conduit matters. An exposed cable can suffer damage from nails, tools, vehicles, rodents, weather, or movement. A suitable raceway reduces these hazards. It also allows future conductor replacement without opening much wall or ceiling material.

Conduit also improves order and inspection. A clear route helps an electrician trace circuits. It helps identify damaged sections. It also allows added conductors when space remains. Poorly chosen conduit can cause other problems. Excessive fill can overheat conductors. Rough edges can damage insulation. Water entry, loose supports, or failed connections can also cause problems.

When Conduit Matters Most?

Conduit installation matters most in garages, workshops, commercial spaces, and outdoor locations. It also matters in unfinished areas and places exposed to impact or weather. Conduit helps during remodels when existing cable can't reach a new panel, receptacle, appliance, or light. Wet locations need raceways and fittings listed for that exposure.

Before work begins, check the wiring method allowed by the adopted electrical code. Also check with the local authority having jurisdiction. Look for crushed raceway, rust, missing bushings, loose straps, and open fittings. Check for water inside the raceway. Check conductors that are hard to pull. A repair may need a new section, better support, or a sealed entry. It may also need a larger raceway instead of added tape.