Table
Conduit Trade Size to Metric Designator
Conduit Trade Size to Metric Designator lookup table with assumptions and boundary notes.
Scope
Naming cross-planning only. It does not provide conduit fill, support spacing, bend limits, or product dimensions.
Lookup table
Crosswalk common conduit trade sizes with metric designator labels.
Scroll sideways to keep row labels aligned with hidden columns.
| Trade size | Metric designator | Decimal trade size | Note |
|---|---|---|---|
| 1/2 in | 16 | 0.5 | Common small raceway label |
| 3/4 in | 21 | 0.75 | Trade label, not exact inside diameter |
| 1 in | 27 | 1 | Use product tables for dimensions |
| 1-1/4 in | 35 | 1.25 | Metric designator is a nominal label |
| 1-1/2 in | 41 | 1.5 | Confirm raceway type for dimensions |
| 2 in | 53 | 2 | Trade size cross-planning only |
| 3 in | 78 | 3 | Trade size cross-planning only |
| 4 in | 103 | 4 | Trade size cross-planning only |
Notes
- Check table values for preliminary lookup and arithmetic checks only.
- Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.