Can I Use PVC Conduit for a Service Lateral?

Yes. Section 230.43 lists rigid polyvinyl chloride conduit among the wiring methods permitted for service entrance conductors, and Article 352 governs its installation. PVC is the most common service lateral raceway in residential work because it is inexpensive, does not corrode in soil, and does not require bonding jumpers across couplings.

Burial depth

Table 300.5 sets the minimum cover. For rigid nonmetallic conduit listed for direct burial without concrete encasement, containing conductors rated 0 to 1000 volts, the minimum cover is 18 inches. Under a residential driveway limited to dwelling unit use, that reduces to 18 inches as well, and under a public street, alley, or parking lot the requirement rises to 24 inches.

Table 300.5 also permits reduced cover where the raceway is encased in concrete: 4 inches of concrete over the raceway brings the requirement down. Section 300.5(D)(1) requires direct buried conductors and cables emerging from grade to be protected by an approved enclosure or raceway from below grade to a point at least 8 feet above finished grade.

Note that the utility, not the NEC, often controls the lateral up to the service point. Many utilities publish their own trench depth, warning tape, and sand bedding requirements that exceed the code minimum. Section 90.2(D) excludes utility owned conductors from the NEC entirely, so on a service lateral you may be working to the utility standard rather than to Table 300.5.

Schedule 40 versus Schedule 80

Section 352.10(F) permits PVC where exposed to physical damage only if it is identified for the use, which in practice means Schedule 80. The riser portion of a service lateral, from grade up to the meter socket, is the classic exposed to damage location, and most jurisdictions require Schedule 80 there even where the buried portion is Schedule 40.

Schedule 80 has a thicker wall and therefore a smaller internal diameter, so recheck your conduit fill against Chapter 9, Table 4 using the Schedule 80 column. A conductor set that fits comfortably in Schedule 40 may exceed 40 percent fill in Schedule 80 of the same trade size.

The details that get corrected

Section 300.5(H) requires a bushing or adapter providing a smoothly rounded insulating surface where the raceway ends underground and conductors leave it. Section 352.46 requires a bushing or the equivalent on the end of any PVC conduit entering an enclosure where the conductors are 4 AWG or larger.

Section 300.5(J) covers earth movement. Where direct buried conductors or raceways are subject to settlement or frost heave, an S loop or expansion fitting is required so the enclosure is not pulled apart. Section 352.44 requires expansion fittings on PVC runs where the length change from temperature exceeds one quarter inch, which happens quickly on long straight above grade runs.

Section 300.5(G) and 225.27 require sealing where the raceway enters a building from an underground run, because condensation and gases travel up a cold conduit and collect in the meter socket or panel. Duct seal is the usual material.

Finally, an equipment grounding conductor is required in the raceway per 250.118 when the PVC feeds a separate structure or serves as a feeder, since PVC provides no grounding path of its own.