GroundED Conductor. The white wire, most often called the neutral conductor. Always carries some current, but may or may not be considered current-carrying by the NEC for de-rating and conduit fill purposes. A neutral conductor in a three-phase circuit that supplies only linear loads (lamps and other resisitive loads) is not considered current-carrying since it only carries the imbalance current of the three phases. If the conductor is supplying non-linear loads (Phase-control dimmers, switch mode power supplies and the like), it is considered a current-carrying conductor. Neutrals in two-wire, single phase applications are always considered current carrying conductors. Compare to Grounding Conductor.