Straight from Mike Holt:
*Neutral Conductor*
The neutral conductor of a 3-wire single-phase 120/240V system, or 4-wire
3-phase 120/208V or 277/408V wye-connected system isn’t considered a
current-carrying conductor.
The neutral conductor of a 3-wire circuit from a 4-wire 3-phase 120/208V or
277V
However, in this case, Peter's installing lots of 120 vac branch
circuits, so all of those neutrals will be carrying full current (unless
they are shared neutral circuits). Mike Holt's exception would apply to
240vac circuits if they had a neutral. Further, Holt's exception would
not be appli
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