When is PVC conduit required instead of Romex?

PVC conduit is required for underground wiring, exposed outdoor runs, in garages below 8 feet, and in commercial buildings. Romex (NM-B) is only for protected interior residential installations.

Can you bury PVC conduit directly?

Schedule 80 PVC can be direct buried. Schedule 40 requires a concrete encasement when buried. Burial depth depends on voltage and location per NEC Table 300.5.

PVC Electrical ConduitGenerating image…

Electrical

Conduit

$3-$25 per 10-foot stick

PVC Electrical Conduit (2026)

Prepared by Lumberama's Building Materials Team

|Last updated May 15, 2026|Sources & methodology

PVC electrical conduit provides a durable, corrosion-resistant pathway for protecting electrical wiring in exposed, underground, and outdoor installations. Available in Schedule 40 for general use and Schedule 80 for direct burial and high-impact areas. Lightweight and easy to cut, assemble, and glue with PVC cement.

Key Features

Corrosion-resistant PVC material
Schedule 40 and 80 options
Easy solvent-weld assembly
Sunlight-resistant gray color
UL listed for electrical use

Specifications

Diameters: 1/2

3/4

1-1/4

1-1/2

2 inches | Lengths: 10-foot sticks | Schedule: 40 (standard)

80 (heavy-duty) | Material: Rigid PVC | Color: Gray

Applications

Underground wire runs
Exposed outdoor wiring
Garage wiring
Workshop wiring
Service entrance conduit

Installation Overview

Cut to length with a hacksaw or PVC cutter. Deburr the cut end. Apply PVC conduit cement to fittings and pipe, then assemble. Support with straps every 3 feet for horizontal runs. Pull wire through after assembly.

Pros & Cons

Pros

✓ Corrosion-proof
✓ Lightweight and easy to work with
✓ Inexpensive
✓ No grounding conductor required inside

Cons

✗ Becomes brittle in extreme cold
✗ Not rated for high temperatures
✗ Must be supported at regular intervals
✗ Expansion joints needed for long runs

Top Brands

Charlotte Pipe

Code Requirements

NEC Article 352 governs PVC conduit. Schedule 80 required where subject to physical damage. Expansion fittings required for runs over 25 feet exposed to temperature changes. Fill calculations per NEC Chapter 9.

Buying Tips

Buy Schedule 40 for protected installations and Schedule 80 for underground or exposed-to-damage locations. Stock up on fittings including elbows, couplings, and adapters. Always use electrical-grade gray PVC, not plumbing white PVC.