What is a Conduit?

Understanding Conduit

Conduit is a protective raceway that carries electrical conductors between two points. A raceway may be rigid or flexible. It may use metal or nonmetallic materials. The tube protects insulation from impact, abrasion, moisture, sunlight, heat, and some chemicals.

Related glossary terms: Electrical Grounding, National Electrical Code, NFPA 70.

Common types include electrical metallic tubing, rigid metal conduit, and intermediate metal conduit. Other types include flexible metal conduit and PVC conduit. Each type has limits for location, temperature, moisture, and physical exposure. Each type also has connection method limits.National Electrical Code sets rules for approved raceways, conductor fill, bend limits, support, and grounding.

How Conduit Works, Is Measured, or Is Used?

An electrician selects conduit based on the environment and the conductors inside it. A wet location may require raceways and fittings listed for moisture. An exposed area may need a stronger metal system. Fittings connect sections and protect conductor insulation at openings. They also maintain the raceway system’s rating.

Conduit size depends on conductor count, conductor size, and insulation type. It also depends on the rules.conductor fill. Installers also account for the number and angle of bends. Too many bends make wire pulling difficult. They may also damage insulation. A typical workflow includes planning the route and choosing the raceway. It also includes installing supports and pulling conductors. Workers then secure fittings and check continuity and grounding.

Why Conduit Matters?

Proper conduit can extend wiring life and reduce damage during construction. It can also reduce damage during maintenance or equipment operation. It makes conductors easier to identify, replace, or reroute in some installations. In commercial, industrial, and exposed residential work, a raceway provides protection. Open cable can't provide the same protection.

The wrong conduit system can create safety and inspection problems. An undersized raceway can crowd conductors and make pulling harder. Incompatible fittings can admit water or weaken mechanical protection. A complete installation must also address bonding, grounding, and box connections. It must protect conductors entering panels or equipment.

When Conduit Matters Most?

Conduit becomes especially important where wiring faces physical damage or moisture. It also helps with corrosive material, vehicles, machinery, or frequent changes. Garages, unfinished spaces, and outdoor equipment often require careful raceway selection. Commercial interiors and industrial areas may need it, too. The installation also matters during remodels. Existing routes may have limited space or hidden damage.

Before work begins, review the project drawings and local requirements. Also review the applicable edition.NFPA 70. Check the raceway marking, conductor ratings, and fitting approvals. Check support spacing and available box space, too. In Fort Wayne, Indiana, permit and inspection requirements can affect the acceptable method. The installed system should match the electrical design and local enforcement practices.