COMMON WATTAGES:
|
Item |
Running Watts |
Starting Surge
|
| 100 watt light bulb |
100 |
100 |
| Radio/Stereo |
50-200 |
50-200 |
| Radio CB |
50 |
50 |
| Fan |
200 |
200 |
| Television |
300-400 |
300-400 |
| Microwave |
700 |
1000 |
| Air Conditioner
(varies) |
3250 |
5000 |
| Furnace fan (1/3 HP) |
600 |
1800 |
| Vacuum cleaner |
600 |
750 |
| Sump pump (1/3 HP) |
700 |
2100 |
| Refrigerator/
Freezer |
800 |
2400 |
| Freezer |
500 |
1500 |
| 6" circular saw |
800 |
1000 |
| Floodlight |
1000 |
1000 |
| 1/2" electric drill |
1000 |
1000 |
| Toaster |
1200 |
1200 |
| Coffee maker |
1200 |
1200 |
| Electric skillet |
1200 |
1200 |
| Hair dryer |
1500 |
1500 |
| 1/2 HP water well
pump |
1000 |
3000 |
| Hot plate |
1500 |
1500 |
| Electric range |
10000 |
10000 |
| 10" table saw |
2000 |
6000 |
| Hot water heater |
5000 |
5000 |
ELECTRIC MOTOR
WATTAGE REQUIREMENTS
Electrical motors present
special electrical startup
considerations. They can require
up to three times their rated
running wattage to start. Motor
nomenclature plates generally
will show starting watts, some
as high as nine times the
running wattage. Check the
nomenclature to be sure. Be
certain to use the starting
watts when figuring the correct
electrical load requirements.
|
Motor Rating HP
|
Approximate
Running Watts
|
Universal Motors
Small Appliance
|
Reduction
Induction Motors
|
Capacitor Motors
|
|
1/8
|
275
|
400
|
600
|
850
|
|
1/4
|
400
|
500
|
850
|
1050
|
|
1/3
|
450
|
600
|
975
|
1350
|
|
1/2
|
600
|
750
|
1300
|
1800
|
|
3/4
|
850
|
1000
|
1900
|
2600
|
|
1 |
1000
|
1250
|
2300
|
3000
|
|
1 1/2
|
1600
|
1750
|
3200
|
4200
|
|
2 |
2000
|
2350
|
3900
|
5100
|
|
3 |
3000
|
3550
|
5200
|
6800
|
WELL PUMP KW
REQUIREMENTS
|
Pump HP Rating
|
Generator
|
|
|
Min. KW
|
Min. KVA
|
|
1/3
|
1.5
|
1.9
|
|
1/2
|
2.0
|
2.5
|
|
3/4
|
3.0
|
3.8
|
|
1 |
4.0
|
5.0
|
|
1 1/2
|
5.0
|
6.25
|
|
2 |
7.5
|
9.4
|
|
3 |
10.0
|
12.5
|
|
5 |
15.0
|
18.75
|
|
7 1/2
|
20.0
|
25.0
|
|
10
|
30.0
|
37.5
|
Convert AMPS to kW or
KVA
Use the following
conversion charts:
3 PHASE AMPERES - 80% POWER
FACTOR
|
KVA
|
KW |
208V
|
220V
|
240V
|
380V
|
416V
|
440V
|
480V
|
|
6.3
|
5 |
17.5
|
16.5
|
15.2
|
9.6
|
8.6
|
8.3
|
7.6
|
|
9.4
|
7.5
|
26.1
|
24.7
|
22.6
|
14.3
|
13
|
12.3
|
11.3
|
|
12.5
|
10
|
34.7
|
33
|
30.1
|
19.2
|
17.3
|
16.6
|
15.1
|
|
18.7
|
15
|
52
|
49.5
|
45
|
28.8
|
26
|
24.9
|
22.5
|
|
25
|
20
|
69.5
|
66
|
60.2
|
38.4
|
34.7
|
33.2
|
30.1
|
|
31.3
|
25
|
87
|
82.5
|
75.5
|
48
|
43.4
|
41.5
|
37.8
|
|
37.5
|
30
|
104
|
99
|
90.3
|
57.6
|
52
|
49.8
|
45.2
|
|
45
|
36
|
125
|
118
|
108
|
68
|
62.5
|
59
|
54
|
|
56.3
|
45
|
156
|
147
|
135
|
85.5
|
78
|
74
|
68
|
|
62.5
|
50
|
173
|
165
|
152
|
96
|
86
|
83
|
76
|
|
75
|
60
|
208
|
198
|
181
|
115
|
104
|
99.6
|
91
|
|
93.8
|
75
|
261
|
247
|
226
|
143
|
130
|
123
|
113
|
|
100
|
80
|
278
|
264
|
240
|
154
|
139
|
133
|
120
|
|
125
|
100
|
347
|
330
|
301
|
192
|
173
|
166
|
150
|
|
156
|
125
|
433
|
413
|
375
|
240
|
217
|
208
|
188
|
|
187
|
150
|
520
|
495
|
450
|
288
|
260
|
249
|
225
|
|
219
|
175
|
608
|
577
|
527
|
335
|
304
|
289
|
264
|
|
250
|
200
|
694
|
660
|
601
|
384
|
347
|
332
|
301
|
|
312
|
250
|
866
|
825
|
751
|
480
|
434
|
415
|
376
|
|
375
|
300
|
1040
|
990
|
903
|
576
|
521
|
498
|
451
|
|
438
|
350
|
1220
|
1155
|
1053
|
672
|
607
|
581
|
527
|
|
500
|
400
|
1390
|
1320
|
1203
|
770
|
694
|
665
|
602
|
|
625
|
500
|
1735
|
1650
|
1504
|
960
|
868
|
830
|
752
|
|
750
|
600
|
2080
|
1970
|
1803
|
1141
|
1042
|
985
|
903
|
|
812
|
650
|
2257
|
2135
|
1958
|
1236
|
1129
|
1067
|
978
|
|
937
|
750
|
2605
|
2463
|
2257
|
1426
|
1303
|
1232
|
1128
|
SINGLE PHASE
AMPERES
|
KVA
|
120\240
|
|
5 |
20.8
|
|
8 |
33.3
|
|
10
|
41.6
|
|
15
|
62.5
|
|
20
|
83.3
|
|
25
|
104
|
|
30
|
125
|
|
35
|
145
|
|
40
|
166
|
|
45
|
187
|
|
50
|
208
|
|
60
|
250
|
|
65
|
270
|
|
76
|
312
|
|
80
|
333
|
|
100
|
416
|
|
125
|
520
|
|
150
|
625
|
|
175
|
729
|
|
200
|
833
|
|
225
|
937
|
|
230
|
958
|
|
260
|
1041
|
|
275
|
1145
|
|
300
|
1250
|
|
350
|
1458
|
|
400
|
1666
|
|
425
|
1770
|
|
450
|
1876
|
|
500
|
2083
|
NEMA CODES FOR
STARTING KVA/hp THREE PHASE
MOTORS
|
CODE
|
STARTING KVA/HP
|
TYPICAL SIZE
RANGE |
CODE
|
STARTING KVA/HP
|
TYPICAL RANGE
|
|
A |
0 -
3.15 |
- |
L |
9.0
-10.0 |
1 HP
|
|
B |
3.15 -
3.55 |
- |
M |
10.0 -
11.2 |
Less
than 1 HP |
|
C |
3.55 -
4.0 |
- |
N |
11.2 -
12.5 |
- |
|
D |
4.0 -
4.5 |
- |
P |
12.5 -
14.0 |
- |
|
E |
4.5 -
5.0 |
- |
R |
14.0 -
16.0 |
- |
|
F |
5.0
-5.6 |
15 HP
and up |
S |
16.0 -
18.0 |
- |
|
G |
5.6 -
6.3 |
10 HP
|
T |
18.0 -
20.0 |
- |
|
H |
6.3 -
7.1 |
7.5
and 5 HP |
U |
20.0 -
22.4 |
- |
|
J |
7.1 -
8.0 |
3 HP
|
V |
22.4
and up |
- |
|
K |
8.0 -
9.0 |
2 and
1-1/2 |
|
|
|
Standard Electrical Formulas
Used for Power Consumption
Calculations
| TO
DETERMINE: |
SINGLE-PHASE |
THREE-PHASE |
DIRECT
CURRENT |
| KVA |
I x
E
1000 |
I x
E x 1.73
1000 |
-------- |
| Kilowatts |
I x
E x PF
1000 |
I x
E x 1.73 x PF
1000 |
I x
E
1000 |
| Horsepower |
I x
E x %EFF x PF
746 |
I x
E x 1.732 x %EFF x PF
746 |
I x
E x %EFF
746 |
| Amperes (when HP is
known) |
HP
x 746
E x %EFF x PF |
HP x 746
1.73 x E x %EFF x PF |
HP
x 746
E x %EFF |
| Amperes (when kW is
known) |
KW
x 1000
E x PF |
KW
x 1000
1.73 x E x PF |
KW
x 1000
E |
| Amperes (when KVA is
known) |
KVA
x 1000
E |
KVA
x 1000
1.73 x E |
|
|
