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For grounded ac premises wiring systems, the conductor to be grounded shall be as specified in the following:
  1. Single-phase, 2-wire — one conductor
  2. Single-phase, 3-wire — the neutral conductor
  3. Multiphase systems having one wire common to all phases — the neutral conductor
  4. Multiphase systems where one phase is grounded — that phase conductor
  5. Multiphase systems in which one phase is used as in (2) — the neutral conductor

Related Code Sections

250.26 Wiring and Protection, Conductor to Be Grounded — Alternating-Current Systems
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