OM-291417 Page 51
11-3. How Much Power Does Equipment Require?
OM-4419 Page 1
VOLTS 115
4.5
50/60
AMPS
Hz
1
2
3
3
1 Resistive Load
A light bulb is a resistive load and requires a
constant amount of power.
2 Non-Resistive Load
Equipment with a motor is a non-resistive
load and requires approximately six times
more power while starting the motor than
when running (see Section 11-7).
3 Rating Data
Rating shows volts and amperes, or watts re-
quired to run equipment.
Amperes x Volts = Watts
Example 1: If a drill uses 4.5 amperes at 115
volts, calculate its running power require-
ment in watts.
4.5 A x 115 V = 520 W
The load applied by the drill is 520 watts.
Example 2: If three 200 watt flood lamps are
used with the drill from Example 1, add the
individual loads to calculate total load.
(3 x 200W) + 520 W = 1120 W
The total load applied by the three flood
lamps and drill is 1120 watts.
11-4. Approximate Power Requirements For Industrial Motors
Industrial Motors Rating Starting Watts Running Watts
Split Phase 1/8 HP 800 300
1/6 HP 1225 500
1/4 HP 1600 600
1/3 HP 2100 700
1/2 HP 3175 875
Capacitor Start-Induction Run 1/3 HP 2020 720
1/2 HP 3075 975
3/4 HP 4500 1400
1 HP 6100 1600
1-1/2 HP 8200 2200
2 HP 10,550 2850
3 HP 15,900 3900
5 HP 23,300 6800
Capacitor Start-Capacitor Run 1-1/2 HP 8100 2000
5 HP 23,300 6000
7-1/2 HP 35,000 8000
10 HP 46,700 10,700
Fan Duty 1/8 HP 1000 400
1/6 HP 1400 550
1/4 HP 1850 650
1/3 HP 2400 800
1/2 HP 3500 1100
To Next Page
Loading...
Need help?
General
