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10-3. Grounding When Supplying Building Systems
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| 1 | Equipment Grounding | |
1 | 2 |
| Terminal | |
2 | Grounding Cable | |||
GND/PE |
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| Use #10 AWG or larger insulated | |||
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| copper wire. | ||
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| 3 | Ground Device | |
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| Y Ground generator to system | ||
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| earth ground if supplying | |
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| power to a premises (home, | |
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| shop, farm) wiring system. |
Use ground device as stated in electrical codes.
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10-4. How Much Power Does Equipment Require?
3
2
1
3
VOLTS 115 AMPS 4.5
Hz 60
1 Resistive Load
A light bulb is a resistive load and requires a constant amount of pow- er.
2
Equipment with a motor is a
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 amperes at 115 volts, calculate its running 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 Example 1, add the individual loads to calculate total load.
(200 W + 200 W + 200 W) + 520 W = 1120 W
The total load applied by the three flood lamps and drill is 1120 watts.