Grounding When Supplying Building Systems - Miller Electric Big Blue 500 PT Owner's Manual

12-3. Grounding When Supplying Building Systems

2
12-4. How Much Power Does Equipment Require?
1
OM-4429 Page 60
1
GND/PE
3
3
2
3
2
VOLTS 115
AMPS 4.5
Hz 60
1 Equipment Grounding
Terminal
2 Grounding Cable
Use #10 AWG or larger insulated
copper wire.
3 Ground Device
.
Use ground device as stated in
electrical codes.
!
Ground generator to system
earth ground if supplying
power to a premises (home,
shop, farm) wiring system.
!
Also see AWS Safety &
Health Fact Sheet No. 29,
Grounding of Portable And
Vehicle Mounted Welding
Generators.
ST-800 576-B
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-re-
sistive load and requires approxi-
mately six times more power while
starting the motor than when running
(see Section 12-8).
3 Rating Data
Rating shows volts and amperes, or
watts required to run equipment.
Amperes x Volts = Watts
Example 1: If a drill uses 4.5 am-
peres at 115 volts, calculate its run-
ning power requirement 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 Ex-
ample 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.
S-0623