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Conduit Fill Limits by Conductor Count

The one, two, three-or-more and short-nipple fill limits used by the conduit fill calculator.
Source
Chapter 9 Table 1
Edition
2023
Updated
2026-07-27
Scope
United States

Lookup Table

Which fill percentage applies to this raceway?

ConductorsPermitted fillUse
153%Single conductor in a raceway
231%Most restrictive packing case
3 or more40%Most branch and feeder pulls
Nipple <= 24 in60%Short nipple between enclosures
Conduit Fill Limits by Conductor Count. Derived as a task-focused reference view; verify marginal work against the source and the AHJ edition.

Calculated against the NEC 2023 edition using Chapter 9 Table 1. Confirm the edition adopted by your AHJ, which may differ and may carry local amendments.

Not covered by this tool

  • Local amendments and equipment markings can be stricter than this reference view.
  • Marginal values should be checked directly against the adopted edition.
  • This page is a routing aid and does not replace the owning calculator for project-specific inputs.

Data last verified