Tony wrote:

and neutral at properly design and grounded system
IS carrying current it is not at zero ever unless on your
screwed up system ground is carrying current
which is not suppose to ever.

Not true. The two hots in a 240V circuit are 180 degrees out of phase.
Only the difference between the loads on the two sides flows through
the neutral. Thus, if you have equal 120V loads on each side, the
neutral will have zero current flowing in it.

and if you take 220 then split the phase of the same
source/cable for 110 the neutral will carry double the current
of single hot wire!

If the neutral carried double the current it would have to be oversized
compared to the hots. In reality, it is often *undersized*. The only
way this can make sense is if your statement is false.

This is why split-wire (aka "edison") circuits need to have the two hots
on opposite legs. If they were on the same leg the neutral *would*
carry the sum of the two legs, which could cause overheating.

Chris