Peter van Hoof wrote:
> While I have not seen this myself either it would have to be
> thicker because it would carry double the current  of the other
> conductors.

No, because the return currents from the two 110V legs are out of phase and
will therefore cancel.  The neutral wire only handles the difference between
the two 110V hot wires, which means worst case it needs to handle the same
current as a hot lead if the entire load is only on one of the 110V phases.


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