Page 138 - Pipeline Rules of Thumb Handbook

Electrical Design 125

Full load currents—three phase transformers

Voltage (line-to-line)
kVA
Rating 240 480 2,400 4,160 12,470

3 7.2 3.6 0.7 0.4 0.1
6 14.4 7.2 1.4 0.8 0.3
9 21.7 10.8 2.2 1.2 0.4
15 36.1 18.0 3.6 2.1 0.7
30 72.2 36.1 7.2 4.2 1.4
37.5 90.2 45.1 9.0 5.2 1.7
45 108.3 54.1 10.8 6.2 2.1
50 120.3 60.1 12.0 6.9 2.3
75 180.4 90.2 18.0 10.4 3.5
100 240.6 120.3 24.1 13.9 4.6
112.5 270.6 135.3 27.1 15.6 5.2
150 360.9 180.4 36.1 20.8 6.9
200 481.1 240.6 48.1 27.8 9.3
225 541.3 270.6 54.1 31.2 10.4
300 721.7 360.9 72.2 41.6 13.9
450 1,082.6 541.3 108.3 62.5 20.8
500 1,202.8 601.4 120.3 69.4 23.2
600 1,443.4 721.7 144.3 83.3 27.8
750 1,804.3 902.1 180.4 104.1 34.7
1,000 2,405.7 1,202.8 240.6 138.8 46.3
1,500 3,608.5 1,804.3 360.9 208.2 69.5
2,000 4,811.4 2,405.7 481.1 277.6 92.6
2,500 6,014.2 3,007.1 601.4 347.0 115.8
5,000 12,028.5 6,014.2 1,202.8 694.0 231.5
10,000 24,057.0 12,028.5 2,405.7 1,387.9 463.0

Motor controller sizes

Polyphase Motors Single Phase Motors

Maximum Horsepower Maximum Horsepower
Full Voltage Starting Full Voltage Starting
(Two Pole Contactor)
NEMA 230 460–575
Size Volts Volts NEMA 115 230
Size Volts Volts
00 1.5 2
0 3 5 00 1.3 1
1 7.5 10 0 1 2
2 15 25 1 2 3
3 30 50 2 3 7.5
4 50 100 3 7.5 15
5 100 200
6 200 400
7 300 600