Page 276 - A O Smith 2012

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IEC/NEMA Comparison
Dimensions in Millimeters kW/Hp** Frame Assignments
IEC H A B K D C E 3 Phase – TEFC
NEMA D 2E 2F H U BA N-W 2 Pole 4 Pole 6 Pole
56 56 90 71 5.8 9 36 20 — — —
NA — — — — — — — — — —
63 63 100 80 7 11 40 23 .25 kW .18 kW —
42 66.7 88.9 42.9 7.1 9.5 52.4 28.6 1/3 Hp 1/4 Hp —
71 71 112 90 7 14 45 30 .55 .37 —
48 76.2 108 69.9 8.7 12.7 63.5 38.1 3/4 1/2 —
80 80 125 100 10 19 50 40 1.1 .75 .55 kW
56 88.9 123.8 76.2 8.7 15.9 69.9 47.8 1 1/2 1 3/4 Hp
90S 90 140 100 10 24 56 50 1.5 1.1 .75
143T 88.9 139.7 101.6 8.7 22.2 57.2 57.2 2 1 1/2 1
90L 90 140 125 10 24 56 50 2.2 1.5 1.1
145T 88.9 139.7 127 8.7 22.2 57.2 57.2 3 2 1 1/2
100L 100 160 140 12 28 63 60 3 2.2 1.5
NA — — — — — — — 4 3 2
112S 112 190 114 12 28 70 60 3.7 2.2 1.5
182T 114.3 190.5 114.3 10.4 28.6 69.9 69.9 5 3 2
112M 112 190 140 12 28 70 60 3.7 4 2.2
184T 114.3 190.5 139.7 10.4 28.6 69.9 69.9 5 5.4/5 —
132S 132 216 140 12 38 89 80 7.5 5.5 3
213T 133.4 215.9 139.7 10.4 34.9 88.9 85.9 10 7 1/2 —
132M 132 216 178 12 38 89 80 — 7.5 5.5
215T 133.4 215.9 177.8 10.4 34.9 88.9 85.9 — 10 7 1/2
160M* 160 254 210 15 42 108 110 15 11 7.5
254T 158.8 254 209.6 13.5 41.3 108 101.6 20 15 10
160L* 160 254 254 15 42 108 110 18.5 15 11
256T 158.8 254 254 13.5 41.3 108 101.6 25 20 15
180M* 180 279 241 15 48 121 110 22 18.5 —
284T 177.8 279.4 241.3 13.5 47.6 120.7 117.4 — 25 —
180L* 180 279 241 15 48 121 110 22 22 15
286T 177.8 279.4 279.4 13.5 47.6 120.7 117.4 30 30 20
200M* 200 318 267 19 55 133 110 30 30 —
324T 203.3 317.5 266.7 16.7 54 133.4 133.4 40 40 —
200L* 200 318 305 19 55 133 110 37 37 22
326T 203.2 317.5 304.8 16.7 54 133.4 133.4 50 50 30
225S* 225 356 286 19 60 149 140 — 37 30
364T 228.6 355.6 285.8 16.7 60.3 149.4 149.4 — 50/75 40
225M* 225 356 311 19 60 149 140 45 45 37
365T 228.6 355.6 311.2 16.7 60.3 149.4 149.4 60/ 75 60/75 50
250M* 250 406 349 24 65 168 140 55 55 —
405T 254 406.4 349.3 20.6 73 168.4 184.2 75/100 75/100 —
280S* 280 457 368 24 75 190 140 — — 45
444T 279.4 457.2 368.3 20.6 85.7 190.5 215.9 — — 60/100
280M* 280 457 419 24 75 190 140 — — 55
445T 279.4 457.2 419.1 20.6 85.7 190.5 215.9 — — 75/125
* Shaft dimensions of these IEC frames may vary between manufacturers.
** Horsepower listed is closest comparable rating with similar mounting dimensions. In some instances this results in
greater Hp rating than required. For example, 37 kW, 4 pole converts to 50 Hp but nearest Hp rating in the NEMA frame
having comparable dimensions is 75 Hp. In these instances the Hp rating printed in black is the direct conversion, and Hp
printed in Red is the Hp of the dimensionally desirable frame. OBSERVE CAUTION if the drive train or driven
load is likely to be damaged by the greater Hp.
Equivalent Hp can be calculated by multiplying the kW rating by 1.341. Multiply Hp by .7457 to convert Hp to kW.
To convert from millimeters to inches, multiply by .03937. To convert from inches to millimeters, multiply by 25.40.
Fraction/Decimal/Millimeter Conversions
Fraction Decimal Millimeter Fraction Decimal Millimeter MM Inch
1⁄64 .015625 0.397 33⁄64 .515625 13.097 1 .0394
1⁄32 .03125 0.794 17⁄32 .53125 13.494 2 .0787
3⁄64 .046875 1.191 35⁄64 .546875 13.891 3 .1181
1⁄16 .0625 1.588 9⁄16 .5625 14.288 4 .1575
5⁄64 .078125 1.984 37⁄64 .578125 14.684 5 .1969
3⁄32 .09375 2.381 19⁄32 .59375 15.081 6 .2362
7⁄64 .109375 2.778 39⁄64 .609375 15.478 7 .2756
1⁄8 .125 3.175 5⁄8 .625 15.875 8 .3150
9⁄64 .140625 3.572 41⁄64 .640625 16.272 9 .3543
5⁄32 .15625 3.969 21⁄32 .65625 16.669 10 .3937
11⁄64 .171875 4.366 43⁄64 .671875 17.066 11 .4331
3⁄16 .1875 4.763 11⁄16 .6875 17.463 12 .4724
13⁄64 .203125 5.159 45⁄64 .703125 17.859 13 .5118
7⁄32 .21875 5.556 23⁄32 .71875 18.256 14 .5512
15⁄64 .234375 5.953 47⁄64 .734375 18.653 15 .5906
1⁄4 .25 6.350 3⁄4 .75 19.050 16 .6299
17⁄64 .265625 6.747 49⁄64 .765625 19.447 17 .6693
9⁄32 .28125 7.144 25⁄32 .78125 19.844 18 .7087
19⁄64 .296875 7.541 51⁄64 .796875 20.241 19 .7480
5⁄16 .3125 7.938 13⁄16 .8125 20.638 20 .7874
21⁄64 .328125 8.334 53⁄64 .828125 21.034 21 .8268
11⁄32 .34375 8.731 27⁄32 .84375 21.431 22 .8661
23⁄64 .359375 9.128 55⁄64 .859375 21.828 23 .9055
3⁄8 .375 9.525 7⁄8 .875 22.225 24 .9449
25⁄64 .390625 9.922 57⁄64 .890625 22.622 25 .9843
13⁄32 .40625 10.319 29⁄32 .90625 23.019
27⁄64 .421875 10.716 59⁄64 .921875 23.416
7⁄16 .4375 11.113 15⁄16 .9375 23.813
29⁄64 .453125 11.509 61⁄64 .953125 24.209
15⁄32 .46875 11.906 31⁄32 .96875 24.606
31⁄64 .484375 12.303 63⁄64 .984375 24.003
1⁄2 .5 12.700 1 1.0 25.400
To convert millimeters
into inches, multiply
by .03937.
To convert inches into
millimeters, multiply
by 25.40.
3600 RPM 1800 RPM 1200 RPM 900 RPM
NEMA Frame Assignments
Open and TEFC (TEFC Frame in Green where different than open)
“T”
Frames
1964
“U”
Frames
1952
Original
NEMA
Frames
NEMA
Frame
Program
“T”
Frames
1964
“U”
Frames
1952
Original
NEMA
Frames
“T”
Frames
1964
“U”
Frames
1952
Original
NEMA
Frames
“T”
Frames
1964
“U”
Frames
1952
Original
NEMA
Frames
1 — — — 143T 182 203 145T 184 204 182T 213 225
1 1/2 143T 182 203 145T 184 204 182T 184 224 184T 213 254
2 145T 184 204 145T 184 224 184T 213 225 213T 215 254
3 145T / 182T 184 224 182T 213 225 213T 215 254 215T 254U 284
5 182T / 184T 213 225 184T 215 254 215T 254U 284 254T 256U 324
7 1/2 184T / 213T 215 254 213T 254U 284 254T 256U 324 256T 284U 326
10 213T / 215T 254U 284 215T 256U 324 256T 284U 326 284T 286U 364
15 215T / 254T 256U 324 254T 284U 326 284T 324U 364 286T 326U 365
20 254T / 256T 284U/286U 326 256T 286U 364 286T 326U 365 324T 364U 404
25 256T / 284TS 286U/324U 364S/365S 284T 324U 364/365 324T 364U 404 326T 365U 405
30 284TS / 286TS 324S/326S 364S/404S 286T 326U 365/404 326T 365U 405 364T 404U 444
40 286TS / 324TS 326S/364US 365S/405S 324T 364U 404/405 364T 404U 444 365T 405U 445
50 324TS / 326TS 364US 404S/444S 326T 365US 405S/444S 365T 405U 445 404T 444U 504U
60 326TS / 364TS 365US/405US 405S/445S 364TS 404US/405US 444S/445S 404T 444U 504U 405T 445U 505
75 364TS / 365TS 404US/444US 444S/504S 365TS 405US/444US 445S/504S 405T 445U 505 444T — —
100 365TS / 405TS 405US/445US 445S/505S 404TS/405TS 444US/445US 504S/505S 444T — — 445T — —
125 404TS / 444TS 444US 504S 405T /444TS 445US 505S 445T — — — — —
150 405TS / 445TS 445US 505S 444TS/445TS — — — — — — — —
200 444TS — — 445TS — — — — — — — —
250 445TS — — — — — — — — — — —