Homes built prior to 1936, especially in rural areas, used a two wire supply system. This system provided 120 volts between a hot conductor and a grounded conductor. A two-wire system is usually inadequate for today’s residential electrical demands.
The most common supply system used in residential applications today is a three-wire supply system. There are 120 volts between any phase and neutral and 240 volts between phases.
Load centers can also be used in commercial applications. Electric power is brought into a building at one location and then is distributed through the building by means of separate circuits. Two distribution systems used in commercial applications that are suitable for load centers are three-wire, three-phase, 240 volts; and four-wire, three-phase, 208Y/120 volts.
The most common supply system used in residential applications today is a three-wire supply system. There are 120 volts between any phase and neutral and 240 volts between phases.
Load centers can also be used in commercial applications. Electric power is brought into a building at one location and then is distributed through the building by means of separate circuits. Two distribution systems used in commercial applications that are suitable for load centers are three-wire, three-phase, 240 volts; and four-wire, three-phase, 208Y/120 volts.
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