This is a simple concept when visualized but can be difficult to understand in written form. Single phase essentially has the same phase or position on the wave throughout the entire circuit....
Both are possible. Single phase requires a neutral (or two phases, such as "Single-phase 240 V) to return the un-used voltage on the "down side" of the generating cycle. Three phases equal "each...
For a three-phase, three-wire, system you will obtain a single-phase supply between any two line conductors. For a three-phase, four-wire, system you will obtain a single-phase supply between any...
Harmonics are the result of the current waveform being distorted by a non-linear load, such as a computer power supply or a motor control drive (VFD). In a commercial setting (which is usually...