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Commonly Used Formulas
(Single phase)
Watts
Amps =
Volts
Common Service Wire
Configurations
208 3Ph
Neutral
A
B
120
120
208
120
208
RED
BLACK
Full Load Current Amps
208 Volt
kW
1 Ph
6
28.8
9
43.2
12
57.6
13.5
64.9
15
72.1
18
86.5
24
115.4
27
129.8
30
144.2
36
173.0
45
216.3
54
259.6
(balanced 3 phase)
Watts
Amps =
Volts x 1.732
BLACK
Ungrounded
C
Neutral
120
120
208
RED
240 Volt
3 Ph
1 Ph
3 Ph
16.6
25.0
14.4
25.0
37.2
21.6
33.3
50.0
28.9
37.5
56.2
32.5
41.6
62.5
36.1
50.0
75.0
43.4
66.7
100.0
57.8
75.0
112.5
65.0
83.3
125.0
72.2
100.0
150.0
86.7
125.0
187.5
108.3
150.0
225.0
130.0
Watts = Amps x Volts
240V 1Ph
GREEN
Grounding
RED
Ungrounded
240
120
120
240 3Ph
A
B
C
120
240
240
240
RED
BLACK
RED
277 Volt
380 Volt
415 Volt
1 Ph
3 Ph
3 Ph
21.6
9.1
8.3
32.4
13.6
12.5
43.3
18.2
16.7
48.7
20.5
18.8
54.1
22.7
20.9
64.0
27.3
25.0
86.6
36.4
33.4
97.4
41.0
37.5
108.3
45.6
41.7
129.9
54.7
50.1
162.4
68.4
62.6
194.9
82.0
75.1
Page 9
GENERAL INFORMATION
Ohms =
Watts
480 3Ph/277 1Ph
Neutral
A
B
277
277
277
480
RED
BLACK
480 Volt
600 Volt
1 Ph
3 Ph
3 Ph
12.5
7.2
5.8
18.7
10.8
8.7
25.0
14.4
11.5
28.1
16.2
13.0
31.2
18.0
14.4
37.5
21.6
17.3
50.0
28.9
23.1
56.2
32.5
26.0
62.5
36.1
28.9
75.0
43.3
34.6
93.7
54.1
43.3
112.5
65.0
52.0
2
Volts
C
480
480
RED
9
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