Electrical Charts & Formulas

Power Factor

80% Power Factor

Generator KVA Rating to Amperage Conversion Chart
kV·A kW 208V 220V 240V 380V 440V 480V 600V 2400V 3300V 4160V
6.3 5 17.5 16.5 15.2 9.6 8.3 7.6 6.1
9.4 7.5 26.1 24.7 22.6 14.3 12.3 11.3 9.1
12.5 10 34.7 33 30.1 19.2 16.6 15.1 12
18.7 15 52 49.5 45 28.8 24.9 22.5 18
25 20 69.5 66 60.2 38.4 33.2 30.1 24 6 4.4 3.5
31.3 25 87 82.5 75.5 48 41.5 37.8 30 7.5 5.5 4.4
37.5 30 104 99 90.3 57.6 49.8 45.2 36 9.1 6.6 5.2
50 40 139 132 120 77 66.5 60 48 12.1 8.8 7
62.5 50 173 165 152 96 83 76 61 15.1 10.9 8.7
75 60 208 198 181 115 99.5 91 72 18.1 13.1 10.5
93.8 75 261 247 226 143 123 113 90 22.6 16.4 13
100 80 278 264 240 154 133 120 96 24.1 17.6 13.9
125 100 347 330 301 192 166 150 120 30 21.8 17.5
156 125 433 413 375 240 208 188 150 38 27.3 22
187 150 520 495 450 288 249 225 180 45 33 26
219 175 608 577 527 335 289 264 211 53 38 31
250 200 694 660 601 384 332 301 241 60 44 35
312 250 866 825 751 480 415 376 300 75 55 43
375 300 1040 990 903 576 498 451 361 90 66 52
438 650 1220 1155 1053 672 581 527 422 105 77 61
500 400 1390 1320 1203 770 665 602 481 120 88 69
625 500 1735 1650 1504 960 830 752 602 150 109 87
750 600 2080 1980 1803 1150 996 902 721 180 131 104
875 700 2430 2310 2104 1344 1274 1052 842 210 153 121
1000 800 2780 2640 2405 1540 1330 1203 962 241 176 139
1125 900 3120 2970 2709 1730 1495 1354 1082 271 197 156
1250 1000 3470 3300 3009 1920 1660 1504 1202 301 218 174
1563 1250 4350 4130 3765 2400 2080 1885 1503 376 273 218
1875 1500 5205 4950 4520 2880 2490 2260 1805 452 327 261
2188 1750 5280 3350 2890 2640 2106 528 380 304
2500 2000 6020 3840 3320 3015 2405 602 436 348
2812 2250 6780 4320 3735 3400 2710 678 491 392
3125 2500 7520 4800 4160 3765 3005 752 546 435
3750 3000 9040 5760 4980 4525 3610 904 654 522
4375 6500 10550 6700 5780 5285 4220 1055 760 610
5000 4000 12040 7680 6640 6035 4810 1204 872 695
Electrical Formulas

Electrical Formulas

To Obtain SINGLE PHASE
(Alternating Current)
THREE PHASE
(Alternating Current)
Kilowatts V x l x pf

1000

1.732 x V x l x pf

1000

kV•A V x l

1000

1.732 x V x l

1000

Amperes
(kW known)
kW x 1000

V x pf

kW x 1000

1.732 x V x pf

Amperes
(motor hp known)
hp x 0.746

V x pf x Efficiency

hp x 0.746

1.732 x V x pf x Efficiency

Amperes
(kV•A known)
kV•A x 1000

V

kV•A x 1000

1.732 x V

Horsepower
(kW unknown)
kW

0.746 x Efficiency (Generator)

kW

0.746 x Efficiency (Generator)

Horsepower
(generator efficiency unknown)
kW

0.746 x 0.93

kW

0.746 x 0.93

kW input
(motor hp known)
hp x 0.746

Efficiency (Motor)

hp x 0.746

Efficiency (Motor)

kW input
(motor efficiency? unknown)
hp x 0.85 hp x 0.85
Cable Ratings

Cable Ratings

AWG SIZE STRANDING NOMINAL O.D. AMPS1 SHIP WT.
LBS./M FT.
8 164 x 30 0.335 80 150
6 269 x 30 0.39 105 210
4 413 x 30 0.45 140 290
2 651 x 30 0.515 190 393
1/0 1050 x 30 0.65 260 595
2/0 1308 x 30 0.655 300 696
4/0 2090 x 30 0.795 405 1032
90o Rated Green CPE lnsuIatIion (UL only)
6 266 x 30 0.365 105 163