Converting Ampere between Single Phase and 3 Phase

Converting amperage between single phase (120, 240 and 480 Voltage) and three phase (240 and 480 Voltage)

With single-phase AC power there is only one single sinusoidal voltage. Most AC power today is produced and distributed as three-phase power where three sinusoidal voltages are generated out of phase with each other.

Sometimes it is necessary to turn between power (VA), voltage (V) and amperage (A). The diagram and table below can be used to convert amperage between single phase and three phase equipment and vice versa.

power va volt ampere diagram

Power
(VA)
Amperage (A)
Volts Single Phase Volts 3 Phase
Balanced Load
120 240 480 240 480
100
150
200
250
300
0.83
1.25
1.67
2.08
2.50
0.42
0.63
0.83
1.04
1.25
0.21
0.31
0.42
0.52
0.63
0.24
0.36
0.49
0.61
0.73
0.13
0.18
0.25
0.30
0.37
350
400
450
500
600
2.92
3.33
3.75
4.17
5.00
1.46
1.67
1.88
2.08
2.50
0.73
0.84
0.93
1.04
1.25
0.85
0.97
1.10
1.20
1.45
0.43
0.49
0.55
0.60
0.73
700
750
800
900
1,000
5.83
6.25
6.67
7.50
8.33
2.92
3.13
3.33
3.75
4.17
1.46
1.56
1.67
1.87
2.10
1.70
1.81
1.93
2.17
2.41
0.85
0.91
0.97
1.09
1.21
1,100
1,200
1,250
1,300
1,400
9.17
10.0
10.4
10.8
11.7
4.58
5.00
5.21
5.42
5.83
2.30
2.51
2.61
2.71
2.91
2.65
2.90
3.10
3.13
3.38
1.33
1.45
1.55
1.57
1.69
1,500
1,600
1,700
1,750
1,800
12.5
13.3
14.2
14.6
15.0
6.25
6.67
7.08
7.29
7.50
3.12
3.34
3.54
3.65
3.75
3.62
3.86
4.10
4.22
4.34
1.82
1.93
2.05
2.10
2.17
1,900
2,000
2,200
2,500
2,750
15.8
16.7
18.3
20.8
23.0
7.92
8.33
9.17
10.4
11.5
3.96
4.17
4.59
5.21
5.73
4.58
4.82
5.30
6.10
6.63
2.29
2.41
2.65
3.05
3.32
3,000
3,500
4,000
4,500
5,000
25.0
29.2
33.3
37.5
41.7
12.5
14.6
16.7
18.8
20.8
6.25
7.30
8.33
9.38
10.42
7.23
8.45
9.64
10.84
12.1
3.62
4.23
4.82
5.42
6.1
6,000
7,000
8,000
9,000
10,000
50.0
58.3
66.7
75.0
83.3
25.0
29.2
33.3
37.5
41.7
12.50
14.59
16.67
18.75
20.85
14.50
16.9
19.3
21.7
24.1
7.25
8.5
9.65
10.85
12.1

Related Topics

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