PVC Schedule 80 Fill

NEC 2020 • 2023 • 2026 COMPLIANT

Download Printable PDF Download Table Image

Select Conduit Type:

EMT (Standard)PVC Sch 40 PVC Sch 80 RMC (Rigid)

Capacity limits for heavy-wall Schedule 80 PVC (accounts for reduced internal area).

Trade Size	ID (in)	100% Area (in²)	1 Wire (53%)	2 Wires (31%)	Over 2 (40%)	60% Nipple
1/2	0.465	0.170	0.090	0.053	0.068	0.102
3/4	0.615	0.297	0.157	0.092	0.119	0.178
1	0.794	0.495	0.262	0.153	0.198	0.297
1-1/4	1.042	0.852	0.452	0.264	0.341	0.511
1-1/2	1.220	1.168	0.619	0.362	0.467	0.701
2	1.558	1.905	1.010	0.591	0.762	1.143
2-1/2	2.049	3.298	1.748	1.022	1.319	1.979
3	2.521	4.994	2.647	1.548	1.998	2.996
3-1/2	2.915	6.673	3.537	2.069	2.669	4.004
4	3.307	8.588	4.552	2.662	3.435	5.153
5	4.813	18.194	9.643	5.640	7.278	10.916
6	5.761	26.067	13.816	8.081	10.427	15.640

Pro Calculation Tool

Calculate PVC 80 Fill

Related NEC Tables

EMT (Standard)PVC Schedule 40 Rigid Metal Conduit

Professional Usage Disclaimer

This data is provided for informational purposes only. Always verify with the latest edition of the National Electrical Code (NFPA 70) and consult with a licensed electrical professional or AHJ (Authority Having Jurisdiction) before performing any electrical work. Zing² is a reference tool, not a substitute for qualified engineering.

Professional Field Notes & Gotchas

▸Heavy Wall Trade-off: Schedule 80 has extra-heavy walls for physical protection, but this significantly reduces the Internal Diameter (ID) compared to Schedule 40.
▸Mandatory Locations: Use Schedule 80 wherever a raceway is 'subject to physical damage' (such as coming out of the ground on a public wall or in a warehouse).
▸Fill Verification: Because Sch 80 is smaller inside, pulling a 4-conductor set that easily fits in Sch 40 might fail a 40% fill check in Sch 80. Always double-check your math.
▸Support Requirements: Due to the heavier weight of Sch 80, ensure your support straps are spaced per NEC 352.30 to prevent sagging under high ambient temperatures.

NEC 2023 vs 2026: What changed?

NEC 2023 vs 2026: No changes to fill rates. The 2026 cycle reinforced using Schedule 80 specifically for EV charger pedestals and similar equipment vulnerable to vehicle impact in parking structures.

Technical FAQs

Is Schedule 80 required above ground?

Only where subject to physical damage. If the conduit is exposed but protected, Sch 40 is usually acceptable. AHJs generally require Sch 80 for the first 8 feet above grade.

How many 4/0 Al wires fit in 2 inch PVC 80?

A 2" Sch 80 PVC (40% fill = 1.151 in²) can hold 3 4/0 Aluminum XHHW-2 conductors (Area = 0.3167 in² each). Adding a 4-th conductor would exceed 40% fill.

Does Schedule 80 need more room than Sch 40?

The outside diameter (OD) is the same, meaning they use the same size hole, but the internal area is smaller. Always use the Sch 80 specific column for wire fill math.