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NEMA Technical Motor Specification

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NEMA Information

Full-Load Currents: Single-Phase Motors*

HP 115V 200V 230V
1/6 4.4 2.5 2.2
1/4 5.8 3.3 2.9
1/3 7.2 4.1 3.6
1/2 9.8 5.6 4.9
3/4 13.8 7.9 6.9
1 16 9.2 8
1-1/2 20 11.5 10
2 24 13.8 12
3 34 19.6 17
5 56 32.2 28
7-1/2 80 46.0 40
10 100 57.5 50

Table 430-148 NEC

*Amps listed are National Electrical Code values for determining circuit wire sizes, starters, etc.


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NEMA Size Starters Maximum
Horsepower Polyphase Motors

Full Voltage Starting

NEMA Size 200V 230V 460V/575V
00 1-1/2 1-1/2 2
0 3 3 5
1 7-1/2 7-1/2 10
2 10 15 25
3 25 30 50
4 40 50 100
5 75 100 200
6 150 200 400
7 - - 300 600
8 - - 450 900
9 - - 800 1600

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Maximum Locked-Rotor Currents

Three Phase Induction Motors 60 Hz

HP 200V 230V 460V 575V
1/2 23 20 10 8
3/4 29 25 12.5 10
1 34.5 30 15 12
1-1/2 46 40 20 16
2 57.5 50 25 20
3 73.5 64 32 25
5 106 92 46 37
7-1/2 146 127 63 51
10 186 162 81 65
15 267 232 116 93
20 334 290 145 116
25 420 365 182 146
30 500 435 217 174
40 667 580 290 232
50 834 725 362 290
60 1000 870 435 348
75 1250 1085 592 435
100 1670 1450 725 580
120 2085 1815 907 726
150 2500 2170 1085 870

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NEMA Code Letters

NEMA Code Letter Locked Rotor KVA per HP NEMA Code Letter Locked Rotor KVA per HP
A 0-3.15 L 9.0 – 10.0
B 3.15 – 3.55 M 10.0 – 11.2
C 3.55 – 4.0 N 11.2 – 12.5
D 40. – 4.5 P 12.5 – 14.0
E 4.5 – 5.0 S 16.0 – 18.0
F 5.0 – 5.6 T 18.0 – 20.0
G 5.6 – 6.3 U 20.0 – 22.4
H 6.3 – 7.1 V 22.4 – and up
J 7.1 – 8.0    
K 8.0 – 9.0    

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Code Letters

Code Letters* F G H J K L
Horsepower 3-Phase 15 & up 10 – 7-1/2 5 3 2-1/2 1
1-Phase 5 3 2 – 1-1/2 1-3/4 1/2

*Full Voltage Start


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Terminal Markings and Connections

Yconnect NEMA Technical Motor Specification

Voltage L1 L2 L3 Join
Low 1,7 2,8 3,9 4&5&6
High 1 2 3 4&7, 5&8, 6&9

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deltaconnect NEMA Technical Motor Specification

Voltage L1 L2 L3 Join
Low 1,6,7,12 2,4,8,10 3,5,9,11
High 1,12 2,10 3,11 4&7, 5&8, 6&9

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xtYconnect NEMA Technical Motor Specification

Voltage L1 L2 L3 Join
Low 1,7 2,8 3,9
High 1 2 3 4&7, 5&8, 6&9

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YDelta NEMA Technical Motor Specification

Voltage   L1 L2 L3 Join
Low Voltage Start 1,7 2,8 3,9 4&5&6, 10&11&12
Run 1,6,7,12 2,4,8,10 3,5,9,11
High Voltage Start 1 2 3 4&7, 5&8, 6&9, 10&11&12
Run 1,12 2,10 3,11 4&7, 5&8, 6&9

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Full-Load Currents

Three-Phase AC Induction 60 Hz

HP 115V 200V 230V 460V 575V
1/4 4 2.3 2 1 8
3/4 5.6 3.2 2.8 1.4 1.1
1 702 4.15 3.6 1.8 1.4
1-1/2 10.4 6 5.5 2.8 2.1
2 13.6 7.8 6.8 3.4 2.7
3 11 9.6 4.8 3.9
5 17.5 15.2 7.6 6.1
7-1/2 25 22 11 9
10 32 28 14 11
15 48 42 21 17
20 62 54 27 22
25 78 68 34 27
30 92 80 10 32
40 120 104 52 41
50 150 130 65 52
60 177 154 77 62
75 221 192 96 77
100 285 248 124 99
125 358 312 156 125
150 415 360 180 144
200 550 480 240 192

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Prior NEMA Frame Mounting

  D E F H U BA M-W KEY
66 4-1/8 2-15/16 2-1/2 13/32 3/4 3-1/8 2-1/4 3/16
143 3-1/2 2-3/4 2 11/32 3/4 2-1/4 3 3/16
145 2-1/2
182 4-1/2 3-3/4 2-1/4 13/32 7/8 2-3/4 2-1/4 3/16
184 2-3/4
203 5 4 2-3/4 13/32 3/4 3-1/8 2-1/4 3/16
204 3-1/4
213 5-1/4 4-1/4 2-3/4 13/32 1-1/8 3-1/2 3 1/4
215 3-1/2
224 5-1/2 4-1/2 3-3/8 13/32 1 3-1/2 3 1/4
225 3-3/4
254
254U
6-1/4 5 4-1/8 17/32 1-1/8 4-1/4 3-3/8 1/4
256U 5 1-3/8 3-3/4 5/16
284
284U
7 5-1/2 4-3/4 17/32 1-1/4 4-3/4 3-3/4 1/4
284U 5-1/2 1-5/8 4-7/8 3/8
324
324U
8 6-1/4 5-1/4 21/32 1-5/8
1-7/8
1-5/8
1-7/8
5-1/4 4-7/8
5-5/8
4-7/8
5-5/8
3/8
1/2
3/8
1/2
326
326U
6
364
364U
9 7 5-5/8 21/32 1-7/8
2-1/8
1-7/8
2-1/8
5-7/8 5-5/8
6-3/8
5-5/8
6-3/8
1/2
1/2
1/2
1/2
365 365U 6-1/8
404
404U
10 8 6-1/8 13/16 2-1/8
2-3/8
2-1/8
2-3/8
6-5/8 6-3/8
7-1/8
6-3/8
7-1/8
1/2
5/8
1/2
5/8
405
405U
6-7/8
444
444U
11 9 7-1/4 13/16 2-3/8
2-7/8
2-3/8
2-7/8
7-1/2 7-1/8
8-5/8
7-1/8
8-5/8
5/8
3/4
5/8
3/4
445
445U
8-1/4
504U 12-1/2 10 8
9
15/16 2-7/8 8-1/2 8-5/8 3/4
505

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NEMA Frame Assignments Open and TEFC

(TEFC Frame in BOLD where different than open)

NEMA Frame Program “T” Frames 1964 “U” Frames 1952 Original NEMA Frames “T”Frames 1964 “U” Frames 1952 Original NEMA Frames
1 143T 182 203
1-1/2 143T 182 203 145T 184 224
2 145T 184 204 145T 184 224
3 145T/182T 184 224 182T 213 225
5 182T/184T 213 225 184T 215 254
7-1/8 184T/213T 215 254 213T 254U 284
10 213/215T 254U 284 215T 256U 324
15 215T/254T 256U 324 254T 284U 326
20 254T/256T 284R/286U 326 256T 286U 364
25 256T/284TS 286U/324U 364S365S 284T 324U 364/365
30 284TS/286TS 324S/326S 36S/404S 286T 326U 365/404
40 286TS/324TS 326S/364US 365S/405S 324T 364U 404/405
50 324TS/326TS 364US 404S/444S 326T 365US 405S/444S
60 326TS/365TS 365US/405US 405S/445S 364TS 404US/405US 444S/445S
75 364TS/365TS 404US/444US 444S/504S 365TS 405US/444US 445S/504S
100 365TS/405TS 405US/445US 445S/505S 404TS/405TS 444US/445US 504S/505S
125 404TS/444TS 444US 504S 405T/444TS 445US 505S
150 405TS/445TS 445US 505S 444TS/445TS
200 444TS 445TS
250 445TS

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NEMA Frame Program “T” Frames 1964 “U” Frames 1952 Original NEMA Frames “T”Frames 1964 “U” Frames 1952 Original NEMA Frames
1 145T 184 204 182T 213 225
1-1/2 182T 184 224 184T 213 254
2 184T 213 225 213T 215 254
3 213T 215 254 215T 254U 284
5 215T 254U 284 254T 256U 324
7-1/2 254T 256U 324 256T 284U 326
10 256T 284U 326 284T 286U 364
15 284T 324U 364 286T 326U 365
20 286T 326U 365 324T 364U 404
25 324T 364U 404 326T 365U 405
30 326T 365U 405 364T 404U 444
40 364T 404U 444 365T 405U 445
50 365T 405U 445 404T 444U 504U
60 404T 444U 504U 405T 445U 505
75 405T 445U 505 444T
100 444T 445T
125 445T
150
200
250

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