MOTOR
CONTROLS
•
Starters
•
Motor Control
Centers
•
Reduced Voltage
Starters
•
Custom Panels
. |
DISTRIBUTION
EQUIPMENT
•
Circuit Breakers
•
Breaker
Panels
•
Disconnect Switches
(Fusible/Non)
•
Complete Distribution
Panels
. |
TRANSFORMERS
•
Dry / Oil Filled
•
1PH / 3PH
. |
MISCELLANEOUS
•
Generators
•
Transfer Switches
•
Motors
. |
|
|
|
HELPFUL RESOURCES
FULL-LOAD
CURRENTS
THREE-PHASE A-C INDUCTION TYPE
-
SQUIRREL CAGE AND WOUND ROTOR MOTORS*
*For conductor sizing only. |
|
HP
|
115V
|
200V
|
230V
|
460V
|
575V
|
2300V
|
4000V
|
|
|
1/2
|
4
|
2.3
|
2
|
1
|
.8
|
.
|
.
|
|
3/4
|
5.6
|
3.2
|
2.8
|
1.4
|
1.1
|
.
|
.
|
|
1
|
7.2
|
4.15
|
3.6
|
1.8
|
1.4
|
.
|
.
|
|
|
1
1/2
|
10.4
|
6
|
5.2
|
2.6
|
2.1
|
.
|
.
|
|
2
|
13.6
|
7.8
|
6.8
|
3.4
|
2.7
|
.
|
.
|
|
3
|
.
|
11
|
9.6
|
4.8
|
3.9
|
.
|
.
|
|
|
5
|
.
|
17.5
|
15.2
|
7.6
|
6.1
|
.
|
.
|
|
7
1/2
|
.
|
25
|
22
|
11
|
9
|
.
|
.
|
|
10
|
.
|
32
|
28
|
14
|
11
|
.
|
.
|
|
|
15
|
.
|
48
|
42
|
21
|
17
|
.
|
.
|
|
20
|
.
|
62
|
54
|
27
|
22
|
.
|
.
|
|
25
|
.
|
78
|
68
|
34
|
27
|
.
|
.
|
|
|
30
|
.
|
92
|
80
|
40
|
32
|
.
|
.
|
|
40
|
.
|
120
|
104
|
52
|
41
|
.
|
.
|
|
50
|
.
|
150
|
130
|
65
|
52
|
.
|
.
|
|
|
60
|
.
|
177
|
154
|
77
|
62
|
15.4
|
8.8
|
|
75
|
.
|
221
|
192
|
96
|
77
|
19.2
|
11
|
|
100
|
.
|
285
|
248
|
124
|
99
|
24.8
|
14.3
|
|
|
125
|
.
|
358
|
312
|
156
|
125
|
31.2
|
18
|
|
150
|
.
|
415
|
360
|
180
|
144
|
36
|
20.7
|
|
200
|
.
|
550
|
480
|
240
|
192
|
48
|
27.6
|
|
| Over
200HP |
| Approx.
Amps/HP. |
2.75 |
2.4 |
1.2 |
.96 |
.24 |
.14 |
|
| Branch-circuit
conductors supplying a single motor shall
have an ampacity not less than 125 percent
of the motor full-load current rating. |
| |
MAXIMUM
HORSEPOWER POLYPHASE MOTORS
|
NEMA
SIZE |
Full
Voltage
Starting |
Auto
- Transformer Starting |
Part
- Winding Starting |
WYE
- Delta Starting |
|
200V
|
230V
|
460V
575V
|
200V
|
230V
|
460V
575V
|
200V
|
230V
|
460V
575V
|
200V
|
230V
|
460V
575V
|
| 00 |
1
1/2
|
1
1/2
|
2
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
|
0 |
3
|
3
|
5
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
| 1 |
7
1/2
|
7
1/2
|
10
|
7
1/2
|
7
1/2
|
10
|
10
|
10
|
15
|
10
|
10
|
15
|
| 2 |
10
|
15
|
25
|
10
|
15
|
25
|
20
|
25
|
40
|
20
|
25
|
40
|
| 3 |
25
|
30
|
50
|
25
|
30
|
50
|
40
|
50
|
75
|
40
|
50
|
75
|
| 4 |
40
|
50
|
100
|
40
|
50
|
100
|
75
|
75
|
150
|
60
|
75
|
150
|
| 5 |
75
|
100
|
200
|
75
|
100
|
200
|
150
|
150
|
350
|
150
|
150
|
300
|
| 6 |
150
|
200
|
400
|
150
|
200
|
400
|
-
|
300
|
600
|
300
|
350
|
700
|
| 7 |
-
|
300
|
600
|
-
|
300
|
600
|
-
|
450
|
900
|
500
|
500
|
1000
|
| 8 |
-
|
450
|
900
|
-
|
450
|
900
|
-
|
700
|
1400
|
750
|
800
|
1500
|
| 9 |
-
|
800
|
1600
|
-
|
800
|
1600
|
-
|
1300
|
2600
|
1500
|
1500
|
3000
|
FULL-LOAD
THREE-PHASE TRANSFORMERS
|
|
KVA
Rating
|
208
|
240
|
480
|
600
|
2400
|
4160
|
|
3
|
8.3
|
7.2
|
3.6
|
2.9
|
.72
|
.415
|
|
6
|
16.6
|
14.4
|
7.2
|
5.8
|
1.44
|
.83
|
|
9
|
25
|
21.6
|
10.8
|
8.7
|
2.16
|
1.25
|
|
15
|
41.6
|
36
|
18
|
14.4
|
3.6
|
2.1
|
|
22.5
|
62
|
54
|
27
|
21.6
|
5.4
|
3.1
|
|
25
|
69
|
60
|
30
|
24
|
6
|
3.5
|
|
30
|
83
|
72
|
36
|
29
|
7.2
|
4.15
|
|
37.5
|
104
|
90
|
45
|
36
|
9
|
5.2
|
|
45
|
125
|
108
|
54
|
43
|
10.8
|
6.25
|
|
50
|
139
|
120
|
60
|
48
|
12
|
7
|
|
75
|
208
|
180
|
90
|
72
|
18
|
10.4
|
|
112.5
|
312
|
270
|
135
|
108
|
27
|
15.6
|
|
150
|
416
|
360
|
180
|
144
|
36
|
20.8
|
|
225
|
625
|
542
|
271
|
217
|
54
|
31.2
|
|
300
|
830
|
720
|
360
|
290
|
72
|
41.5
|
|
500
|
1390
|
1200
|
600
|
480
|
120
|
69.4
|
|
600
|
1665
|
1443
|
722
|
577
|
144
|
83
|
|
750
|
2080
|
1800
|
900
|
720
|
180
|
104
|
|
1000
|
2775
|
2400
|
1200
|
960
|
240
|
139
|
|
1500
|
4150
|
3600
|
1800
|
1440
|
360
|
208
|
|
2000
|
5550
|
4800
|
2400
|
1930
|
480
|
277
|
|
2500
|
6950
|
6000
|
3000
|
2400
|
600
|
346
|
|
5000
|
13900
|
12000
|
6000
|
4800
|
1200
|
694
|
|
7500
|
20800
|
18000
|
9000
|
7200
|
1800
|
1040
|
|
10000
|
27750
|
24000
|
12000
|
9600
|
2400
|
1386
|
For
other KVA ratings or voltages:
| Ampere
= |
KVA
x 1000
|
| Volts
x 1.732 |
|
FULL-LOAD
SINGLE-PHASE TRANSFORMERS
|
|
KVA
Rating
|
120
|
208
|
240
|
480
|
600
|
2400
|
|
1
|
8.3
|
4.8
|
4.2
|
2.1
|
1.7
|
.42
|
|
1.5
|
12.5
|
7.2
|
6.2
|
3.1
|
2.5
|
.62
|
|
2
|
16.7
|
9.6
|
8.3
|
4.2
|
3.3
|
.83
|
|
3
|
25
|
14.4
|
12.5
|
6.2
|
5.0
|
1.25
|
|
5
|
41.7
|
24
|
20.8
|
10.4
|
8.3
|
2.1
|
|
7.5
|
62.5
|
36.1
|
31.2
|
15.6
|
12.5
|
3.1
|
|
10
|
83.4
|
48
|
41.6
|
20.8
|
16.7
|
4.16
|
|
15
|
125
|
72
|
62.5
|
31.2
|
25
|
6.25
|
|
25
|
208
|
120
|
104
|
52
|
41.7
|
10.4
|
|
37.5
|
312
|
180
|
156
|
78
|
62.5
|
15.6
|
|
50
|
417
|
240
|
208
|
104
|
83.5
|
20.8
|
|
75
|
625
|
361
|
312
|
156
|
125
|
31.2
|
|
100
|
834
|
480
|
416
|
208
|
167
|
41.6
|
|
125
|
1042
|
600
|
520
|
260
|
208
|
52
|
|
167.5
|
1396
|
805
|
698
|
349
|
279
|
70
|
|
200
|
1666
|
960
|
833
|
416
|
333
|
83.3
|
|
250
|
2080
|
1200
|
1040
|
520
|
417
|
104
|
|
333
|
2776
|
1600
|
1388
|
694
|
555
|
139
|
|
500
|
4170
|
2400
|
2080
|
1040
|
835
|
208
|
DISCLAIMER:
BEMCO Electrical nor its authors, nor publisher
shall be held responsible for any errors in content,
nor shall they be responsible for the interpretation,
application, or results of calculations acquired
through the use of the website.
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