10.3 Grounding When Supplying Building Systems
1Equipment Grounding Terminal
2Grounding Cable
Use #10 AWG or larger insulated copper wire.
3 Ground Device
YGround generator to system earth ground if supplying power to a premises (home, shop, farm) wiring system.
1 2
GND/PE
| Use ground device as stated |
2 | in electrical codes. |
3 |
10.4 How Much Power Does Equipment Require?
1 | Resistive Load |
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A light bulb is a resistive load and |
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requires a constant amount of pow- | 3 | ||
er. |
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2 | |||
1 | |||
Equipment with a motor is a | |||
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sistive load and requires approxi- |
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mately six times more power while |
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starting the motor than when run- |
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ning (see Section 10.8). |
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3 | Rating Data | 3 | |
Rating shows volts and amperes, | |||
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or watts required to run equipment.
VOLTS 115
AMPS 4.5
Hz 60
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.
40 |
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