Ch. 9 Tables 1, 4, 5

Conduit fill, by trade size

Verified against NEC 2023, checked against the 2026 edition · Last checked August 19, 2026

Pick a raceway and trade size and get the maximum THHN count for every wire size, standard runs and nipples, computed from the same verified dataset that powers the JobVolt app. Mixed pulls run through the free calculator on every page.

EMT

Thinwall, Article 358. Trade sizes 1/2 through 4.

1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
3-1/2"
4"

Schedule 40 PVC

Article 352. Trade sizes 1/2 through 6.

1/2"
3/4"
1"
1-1/4"
1-1/2"
2"
2-1/2"
3"
3-1/2"
4"
5"
6"

Any pull, seven raceway types, offline.

The JobVolt app checks fill for mixed sizes and insulations across seven raceway types, flags jam ratio, and exports inspector-ready PDF submittals.