12-3. Grounding When Supplying Building Systems
|
|
| 1 | Equipment Grounding | |
| 1 | 2 |
| Terminal |
|
| 2 | Grounding Cable |
| ||
| GND/PE |
|
| ||
|
| 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 & | |
2 | 3 |
|
| Health Fact Sheet No. 29, | |
|
| Grounding of Portable And | |||
|
|
|
| Vehicle Mounted | Welding |
|
|
|
| Generators. |
|
12-4. How Much Power Does Equipment Require?
1 Resistive Load
3
2
1
3
VOLTS 115 AMPS 4.5
Hz 60
A light bulb is a resistive load and requires a constant amount of power.
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 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.