The pole-mounted distribution transformer (also known as a 'pole pig') has a primary voltage of 12.47 kV (line-line) or 7.2 kV (line-neutral).

[![enter image description here][1]][1]

The single secondary winding L1 - L2, with an earthed centre tap designated as the neutral, supplies single-phase voltages 2 x 120 V and 1 x 240 V to the consumer. 


  [1]: https://i.sstatic.net/pZKEw.png