That question has been answered. But let me suggest that you take the same two phase wires that you used for your experiment and connect them instead to the primary of a single phase transformer. The voltage ratio is not important, but for discussion sake let us say the secondary voltage is 120/240. Try your experiment again, this time using the transformer secondary as your voltage source.
Originally Posted by rmann
Charles E. Beck, P.E., Seattle
Comments based on 2014 NEC unless otherwise noted.