Table
IEC vs NEMA Motor Frame Reference
IEC vs NEMA Motor Frame Reference reference with assumptions and boundary notes.
Reference boundary
Motor frame reference only. It does not approve a motor replacement, shaft fit, base fit, enclosure, efficiency class, or certification match.
Reference table
Compare common IEC and NEMA motor frame labels by rough shaft-height and mounting-context references.
| Frame label | Nearest counterpart | Shaft height (mm) | Mounting context | Boundary |
|---|---|---|---|---|
| IEC 80 | NEMA 56C | 80 | small metric frame reference | frame comparison reference only; manufacturer dimension drawings govern fit and replacement |
| IEC 90S | NEMA 143T | 90 | common small industrial frame reference | frame comparison reference only; manufacturer dimension drawings govern fit and replacement |
| 143T | IEC 90S | 90 | common NEMA-to-IEC frame reference | frame comparison reference only; manufacturer dimension drawings govern fit and replacement |
| 145T | IEC 90L | 90 | common NEMA-to-IEC frame reference | frame comparison reference only; manufacturer dimension drawings govern fit and replacement |
| IEC 100L | NEMA 182T | 100 | mid-size metric frame reference | frame comparison reference only; manufacturer dimension drawings govern fit and replacement |
| 184T | IEC 112M | 112 | mid-size NEMA frame reference | frame comparison reference only; manufacturer dimension drawings govern fit and replacement |
Use notes
- Use this table for preliminary reference and arithmetic checks only.
- Confirm equipment ratings, product markings, installation conditions, utility requirements, and the local authority requirements before design or field use.