"dondone" wrote in message
If you notice, load centers (circuit breaker boxes) have two vertical rows
of breakers. The box is pre-wired so that alternating 110 V breakers in
each row are connected to different sides of the two 220 hot lines.

Your "different sides of the two 220 hot lines" is likely to cause some
confusion, IMO. In your example, it is actually two 110v legs that, with a
neutral, supply 110v separately, and 220v only when combined.

Code in my area requires that all receptacles be GFI protected.

Pretty tough code y'all have. Normally only outside, garage,
bathroom/kitchen counter circuits require ground fault protection.

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