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Electrical Motors - NEMA Frame Assignments

NEMA frame assignments.

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

Single-phase Electrical Motors - NEMA Standardized Frame Assignments - rpm vs. power
Power (hp)speed (rpm)
360018001200
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

Polyphase Squirrel-cage Electrical Motors Open Time - NEMA Standardized Frame Assignments - rpm vs. power
Power (hp)speed (rpm)
360018001200900
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

Polyphase Squirrel-cage Electrical Motors Fan Cooled - NEMA Standardized Frame Assignments - rpm vs. power
Power (hp)speed (rpm)
360018001200900
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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