PLC is first line?

[K4680]

My orientation/education is more biological than electrical. To reveal my ignorance, is typical US 110 volt three phase and or applicable?

To my knowledge, most US 110V installs will be single phase. 

Jean-Marie

Hello, not everywhere! A split-phase electric power is a power supply system commonly used in North America for single-family households and small businesses (up to about 100 kW). It is the AC version of Edison's now historic three-wire DC system. Since there is voltage on two conductors, it is often mistakenly referred to as a "two-phase current system". In fact, however, the same single-phase alternating current is transmitted on both conductors.