You can't tell the players without a program:

Many terms get thrown around; here is a quick guide to the terms

Leg: Different voltage portion of a single Phase, high/low, left/right, red/black

Phase: (Often misused for "Leg"), power 120 degrees apart in the cycle.

Power: (Watt) Power unit (Amps x Volts)

Horsepower: ~750 Watts

Current: (Ampere) unit of electrons (think gallon)

Voltage: (Volt) unit of electrical pressure (think psi)

Construction Service: "Temporary" (but can be permanent) utility service

Meter: Measurement of energy delivered (Watts x Hours, plus Peak Watts)

Price: Watt may cost 3, 12, 40, 99 cents per Kilo (1,000) Watt Hour (kWh)

Demand: 15-minute monthly high peak usage in kilowatts (~$15/kW)

120 Volt: 170 volt circuit

240 Volt: 340 volt circuit

277 Volt: One 388 Volt phase, of a three-phase service.

<50 volt: "OSHA Safe" voltages

GFCI: Circuit to make +50 volt power safe by automatic disconnection.