Miller Electric Big Blue 251D Grounding When Supplying Building Systems, Amperes x Volts = Watts

11-3. 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
			Y Ground generator to system
				earth ground if supplying
				power to a premises (home,
				shop, farm) wiring system.
			Use ground device as stated
2	3		in electrical codes.

ST-800 576-B

11-4. 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 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 11-8).

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.

S-0623

OM-480 Page 37