Doug Miller wrote:
But he never actually said that he has a neutral. He's *assuming* that
there is one. This is a common assumption among people who don't
understand how North American 240V service works, but it's usually a
mistaken assumption.

He expressly referred to two hot wires, a ground wire, and a wire he
referred to as a "common." 4 wires in all. What are you suggesting he
means by "common" other than neutral? No one is suggesting he or anyone
else wire anything without verifying for certain that that is the case.
But we have only what he stated to go on.

Since you're the one who is coming to the conclusion that the wire he
refers to is NOT a neutral may I ask what you think it is? Everyone else
here believes he is referring to a neutral...yes yes it should be
verified...but that's what he said and I'm puzzled why you draw some other
conclusion.