On Sat, 23 Nov 2013 16:09:26 -0500, someone wrote:

From Professor Cardell's web page at
http://www.science.smith.edu/~jcarde...ecPwr_HSW.html

"There are two wires running out of the transformer and three wires
running to the house. The two from the transformer are insulated, and
the third one is bare. The bare wire is the ground wire. The two insulated
wires each carry 120 volts, but they are 180 degrees out of phase so the
difference between them is 240 volts."

Why are all three of mine insulated?
http://farm3.staticflickr.com/2886/1...21cf1404_o.gif