Grounding When Supplying Building Systems - Miller Electric Big 40 CAT Owner's Manual

12-3. Grounding When Supplying Building Systems

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12-4. How Much Power Does Equipment Require?
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EXAMPLE 1: If a drill uses 4.5 amperes at 115 volts, calculate its running power
requirement in 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.
The total load applied by the three flood lamps and drill is 1120 watts.
OM-4406 Page 62
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GND/PE
3
3
2
3
AMPERES x VOLTS = WATTS
4.5 A x 115 V = 520 W
The load applied by the drill is 520 watts.
(200 W + 200 W + 200 W) + 520 W = 1120 W
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Use ground device as stated
in electrical codes.
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
Y Ground generator to system
earth ground if supplying
power to a premises (home,
shop, farm) wiring system.
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.
S-0623