Miller Electric Metro 250D Grounding When Supplying Building Systems, Amperes x Volts = Watts

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.

ST-800 576-B

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
A light bulb is a resistive load and
requires a constant amount of pow-		3
er.		2
2 Non-Resistive Load
		1
Equipment with a motor is a non-re-
sistive load and requires approxi-
mately six times more power while
starting the motor than when run-
ning (see Section 10.8).
3	Rating Data	3
Rating shows volts and amperes,

or watts required to run equipment.

S-0623

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 OM-402