GENSET SIZING — DETERMINING LOAD CHARACTERISTICS
Three Phase NEMA Motor Code Table
Table 7 lists the 3Ø motor starting kVA, starting power factor, and motor factors. Do not confuse the NEMA (National Electrical Manufacturers Association) motor Code and design letters. The code letter refers to the ratio of locked rotor kVA to HP, whereas the design letter refers to the ratio of torque to speed.
Table 7. Three Phase Motor SkVA, SPF, EFF, and RPF
HP |
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| NEMA Motor Code Letters |
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| Motor Factors | |||||||
A | B | C | D | E | F | G | H | J | K | L | N | SPF | EFF | RPF | ||
| ||||||||||||||||
1/4 | 0.5 | 0.8 | 0.9 | 1.0 | 1.2 | 1.3 | 1.5 | 1.7 | 1.9 | 2.1 | 2.4 | 2.9 | 0.82 | 62.8 | 0.55 | |
1/2 | 1.0 | 1.7 | 1.9 | 2.1 | 2.4 | 2.6 | 3.0 | 3.3 | 3.8 | 4.2 | 4.7 | 5.9 | 0.82 | 62.8 | 0.55 | |
3/4 | 1.5 | 2.5 | 2.8 | 3.2 | 3.6 | 4.0 | 4.5 | 5.0 | 5.7 | 6.4 | 7.1 | 8.9 | 0.78 | 69.3 | 0.64 | |
1 | 2 | 3 | 4 | 4 | 5 | 5 | 6 | 7 | 8 | 8 | 9 | 12 | 0.76 | 73.0 | 0.70 | |
3 | 5 | 6 | 6 | 7 | 8 | 9 | 10 | 11 | 13 | 14 | 18 | 0.72 | 76.9 | 0.76 | ||
2 | 4 | 7 | 8 | 8 | 9 | 11 | 12 | 13 | 15 | 17 | 19 | 24 | 0.70 | 79.1 | 0.79 | |
3 | 6 | 10 | 11 | 13 | 14 | 16 | 18 | 20 | 23 | 25 | 28 | 35 | 0.66 | 82.5 | 0.82 | |
5 | 10 | 15 | 19 | 21 | 24 | 26 | 30 | 33 | 38 | 42 | 47 | 59 | 0.61 | 83.8 | 0.85 | |
15 | 25 | 28 | 32 | 36 | 40 | 45 | 50 | 57 | 64 | 71 | 89 | 0.56 | 85.1 | 0.87 | ||
10 | 20 | 33 | 38 | 42 | 47 | 53 | 59 | 67 | 75 | 85 | 95 | 118 | 0.53 | 85.9 | 0.87 | |
15 | 30 | 50 | 57 | 64 | 71 | 79 | 89 | 100 | 113 | 127 | 142 | 177 | 0.49 | 86.9 | 0.88 | |
20 | 40 | 67 | 75 | 85 | 95 | 106 | 119 | 134 | 151 | 170 | 190 | 236 | 0.46 | 87.6 | 0.89 | |
25 | 50 | 84 | 94 | 106 | 119 | 132 | 149 | 167 | 189 | 212 | 237 | 295 | 0.44 | 88.0 | 0.89 | |
30 | 60 | 100 | 113 | 127 | 142 | 159 | 178 | 201 | 226 | 255 | 285 | 354 | 0.42 | 88.4 | 0.89 | |
40 | 80 | 134 | 151 | 170 | 190 | 212 | 238 | 268 | 302 | 340 | 380 | 475 | 0.39 | 88.9 | 0.90 | |
50 | 100 | 167 | 189 | 212 | 237 | 265 | 297 | 335 | 377 | 425 | 475 | 590 | 0.36 | 89.6 | 0.90 | |
60 | 120 | 201 | 226 | 255 | 285 | 318 | 357 | 402 | 453 | 510 | 570 | 708 | 0.36 | 89.6 | 0.90 | |
75 | 150 | 251 | 283 | 318 | 356 | 397 | 446 | 502 | 566 | 637 | 712 | 885 | 0.34 | 90.0 | 0.90 | |
100 | 200 | 335 | 377 | 425 | 475 | 530 | 595 | 670 | 755 | 849 | 949 | 1180 | 0.31 | 90.5 | 0.91 | |
125 | 250 | 418 | 471 | 531 | 593 | 662 | 743 | 837 | 943 | 1062 | 1187 | 1475 | 0.29 | 90.9 | 0.91 | |
150 | 300 | 502 | 566 | 637 | 712 | 794 | 892 | 1004 | 1132 | 1274 | 1424 | 1770 | 0.28 | 91.2 | 0.91 | |
200 | 400 | 669 | 754 | 849 | 949 | 1059 | 1189 | 1339 | 1509 | 1699 | 1899 | 2360 | 0.25 | 91.7 | 0.91 | |
250 | 500 | 836 | 943 | 1061 | 1186 | 1324 | 1486 | 1674 | 1886 | 2124 | 2374 | 2950 | 0.24 | 92.0 | 0.91 | |
300 | 600 | 1004 | 1131 | 1274 | 1424 | 1589 | 1784 | 2009 | 2264 | 2549 | 2849 | 3540 | 0.22 | 92.3 | 0.92 | |
350 | 700 | 1171 | 1320 | 1486 | 1661 | 1853 | 2081 | 2343 | 2641 | 2973 | 3323 | 4130 | 0.19 | 93.1 | 0.92 | |
400 | 800 | 1338 | 1508 | 1698 | 1898 | 2118 | 2378 | 2678 | 3018 | 3398 | 3798 | 4720 | 0.19 | 93.1 | 0.92 | |
500 | 1000 | 1673 | 1885 | 2123 | 2373 | 2648 | 2973 | 3348 | 3773 | 4248 | 4748 | 5900 | 0.17 | 93.8 | 0.92 |
INDUSTRIAL GENERATOR SETS — APPLICATION & INSTALLATION MANUAL — REV. #4 (09/07/07) — PAGE 25