Electrical Motors - NEMA Frame Assignments
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National Electric Manufacturers Association (NEMA) standardized frame assignments for
- single-phase motors horizontal and vertical
- polyphase squirrel-cage motors horizontal and vertical - open time
- polyphase squirrel-cage motors horizontal and vertical - fan-cooled
are indicated below:
Single-phase motors horizontal and vertical
| Power (hp) | speed (rpm) | ||
|---|---|---|---|
| 3600 | 1800 | 1200 | |
| 3/4 | - | - | 145T |
| 1 | - | 143T | 182T |
| 1 1/2 | 143T | 145T | 184T |
| 2 | 145T | 182T | - |
| 3 | 182T | 184T | - |
| 5 | 184T | 213T | - |
| 7 1/2 | 213T | 215T | - |
.
Polyphase squirrel-cage motors horizontal and vertical - open time
| Power (hp) | speed (rpm) | |||
|---|---|---|---|---|
| 3600 | 1800 | 1200 | 900 | |
| 1/2 | - | - | - | 143T |
| 3/4 | - | - | 143T | 145T |
| 1 | - | 143T | 145T | 182T |
| 1 1/2 | 143T | 145T | 182T | 184T |
| 2 | 145T | 145T | 184T | 213T |
| 3 | 145T | 182T | 213T | 215T |
| 5 | 182T | 184T | 215T | 254T |
| 7 1/2 | 184T | 213T | 254T | 256T |
| 10 | 213T | 215T | 256T | 284T |
| 15 | 215T | 254T | 284T | 286T |
| 20 | 254T | 256T | 286T | 324T |
| 25 | 256T | 284T | 324T | 326T |
| 30 | 284TS | 286T | 326T | 364T |
| 40 | 286TS | 324T | 364T | 365T |
| 50 | 324TS | 326T | 365T | 404T |
| 60 | 326TS | 364TS | 404T | 405T |
| 75 | 364TS | 365TS | 405T | 444T |
| 100 | 365TS | 404TS | 444T | 445T |
| 125 | 404TS | 405TS | 445T | - |
| 150 | 405TS | 444TS | - | - |
| 200 | 444TS | 445TS | - | - |
| 250 | 445TS+ | - | - | - |
Polyphase squirrel-cage motors horizontal and vertical - fan-cooled
| Power (hp) | speed (rpm) | |||
|---|---|---|---|---|
| 3600 | 1800 | 1200 | 900 | |
| 1/2 | - | - | - | 143T |
| 3/4 | - | - | 143T | 145T |
| 1 | - | 143T | 145T | 182T |
| 1 1/2 | 143T | 145T | 182T | 184T |
| 2 | 145T | 145T | 184T | 213T |
| 3 | 182T | 182T | 213T | 215T |
| 5 | 184T | 184T | 215T | 254T |
| 7 1/2 | 213T | 213T | 254T | 256T |
| 10 | 215T | 215T | 256T | 284T |
| 15 | 254T | 254T | 284T | 286T |
| 20 | 256T | 256T | 286T | 324T |
| 25 | 284TS | 284T | 324T | 326T |
| 30 | 286TS | 286T | 326T | 364T |
| 40 | 324TS | 324T | 364T | 365T |
| 50 | 326TS | 326T | 365T | 404T |
| 60 | 364TS | 364TS | 404T | 405T |
| 75 | 365TS | 365TS | 405T | 444T |
| 100 | 405TS | 405TS | 444T | 445T |
| 125 | 444TS | 444TS | 445T | - |
| 150 | 445TS | 445TS | - | - |
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