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become excessively hot and cause the insulation to
break down, reducing its ability to resist corrosive
contaminants.
Over time the effectiveness of the
insulation is eliminated and a dead short can result.
Always compare the generator nameplate data
with that of the equipment to be used to ensure that
watts, volts, amperage, and frequency requirements
are suitable for operating equipment. The wattage
listed on the equipment nameplate is its rated output.
However, some equipment may require three to ten
times more wattage than its rating on the nameplate,
as the wattage is influenced by the equipment
efficiency, power factor and starting system. NOTE: If
wattage is not given on equipment nameplate,
approximate
wattage
multiplying
nameplate
amperage.
VOLTS X AMPS = WATTS
Example: 120V
X 5A
When connecting a resistive
incandescent lights, heaters or common electric power
tools, a capacity of up to the generator full rated
wattage output can be used.
When connecting a resistive-inductive load such
as a fluorescent or mercury light, transformers or
inductive coils, a capacity of up to 0.6 times the
generator's full rated output can be used.
Always allow the generator to reach operating
speed before a load is applied.
STARTING ELECTRIC MOTORS
Electric motors require much more current (amps)
to start than to run. Some motors, particularly low cost
split-phase motors, are very hard to start and require 5
to 7 times more current to start than to run. Capacitor
motors are easier to start and usually require 2 to 4
times as much current to start than to run. Repulsion
Induction motors are the easiest to start and require
1.5 to 2.5 times as much to start than to run.
Most fractional motors take about the same
amount of current to run them whether they are of
Repulsion-Induction (RI), Capacitor (Cap), or Split-
Phase (SP) type.
The following chart shows the
approximate current required to start and run various
types and sizes of 120 volt 60 cycle electric motors
under various conditions.
120V, 60 Hz Motors
Hp motor Running
RI type
Watts
1/6
525
1/4
700
1/3
875
1/2
1175
1
1925
may
be
determined
voltage
by
nameplate
= 600W
load such as
Starting Amps
Cap type
SP type
7-11
9-18
16-22
9-15
12-23
22-32
11-18
14-29
26-35
15-25
20-40
NA
24-40
32-64
NA
1 1/2
2
3
5
The figures given above are for an average load
such as a blower or fan.
connected to a hard starting load such as an air
compressor, it will require more starting current. If it is
connected to a light load or no load such as a power
saw, it will require less starting current. The exact
requirement will also vary with the brand or design of
the motor.
Generators
by
differently than the power line. When overloaded, the
engine is not able to supply enough power to bring the
electric motor up to operating speed. The generator
responds to the high initial starting current, but the
engine speed drops sharply. The overload may stall
the engine. If allowed to operate at very low speeds,
the electric motor starter winding will burn out in a
short time. The generator head winding might also be
damaged.
Running the generator under these conditions may
result in damage to the generator stator as well as the
electric motor windings. Because the heavy surge of
current is required for only an instant, the generator
will not be damaged if it can bring the motor up to
speed in a few seconds. If difficulties in starting a
motor are experienced, turn off all other electrical
loads and if possible reduce the load on the electric
motor.
EXTENSION CORDS
When electric power is to be provided to various
loads at some distance from the generator, extension
cords can be used. These cords should be sized to
allow for distance in length and amperage so that the
voltage drop between the set and point of use is held
to a minimum.
Current/Pow er
Amps
Load
at
(watts)
240V
10
2400
20
4800
30
7200
40
9600
50
12000
CAUTION: Equipment damage can result from the
low voltage caused by using an extension cord with a
small wire size.
Use this chart to estimate the total load on your
generator.
For Determining Generator Load Requirements
6
2400
30-50
40-80
2900
36-60
48-96
4075
51-85
68-136
6750
84-140
112-224
If the electric motor is
respond
to
severe
Maximum Extension Cord Length
#10
#12
Ga.
Ga.
Cord
Cord
250'
150'
125'
75'
60'
35'
30'
15'
15'
*
*Not recommended
NA
NA
NA
NA
overloading
#14
#16
Ga.
Ga.
Cord
Cord
100'
75'
50'
25'
25'
10'
10'
*
*
*
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