A six circuit voltmeter and ground detector switch, for use on a three wire system, has four circuits for ground detector and two circuits for voltmeter readings.
Transposition diagram for three phase, three wire line, transposing at the vertices of an equilateral triangle.
Transposition diagram of three phase, three wire line, with center arranged in a straight line.
For this reason the middle wire of a three wire system is called the neutral wire, and is usually indicated by the symbol O or ± the latter meaning that it is positive to the first wire and negative to the second.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "three wire" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
