USE AND IDENTIFICATION OF

GROUNDED CONDUCTORS 200-1. Scope. This article provides requirements for (1) identification of terminals; (2) grounded conductors in premises wiring systems; and (3) identification of grounded conductors. (FPN): See Article 100 for definitions of "Grounded Conductor" and "Grounding Conductor." 200-2. General. All premises wiring systems shall have a grounded conductor that is identified in accordance with Section 200-6. Exception: Circuits and systems exempted or prohibited by Sections 210-10, 215-7, 250-3, 250-5, 250-7, 503-13, 517-63, 668-11, 668-21, and 690- 41, Exception. The grounded conductor, where insulated, shall have insulation (1) that is suitable, other than color, for any ungrounded conductor of the same circuit on circuits of less than 1000 volts, or (2) rated not less than 600 volts for solidly grounded neutral systems of 1 kV and over as described in Section 250-152(a). 200-3. Connection to Grounded System. Premises wiring shall not be electrically connected to a supply system unless the latter contains, for any grounded conductor of the interior system, a corresponding conductor that is grounded. For the purpose of this section, "electrically connected" shall mean connected so as to be capable of carrying current as distinguished from connection through electromagnetic induction. 200-6. Means of Identifying Grounded Conductors. (a) Sizes No. 6 or Smaller. An insulated grounded conductor of No. 6 or smaller shall be identified by a continuous white or natural gray outer finish along its entire length. Exception No. 1: Multiconductor varnished-cloth-insulated cables. Exception No. 2: Fixture wires as outlined in Article 402. Exception No. 3: Where the conditions of maintenance and supervision assure that only qualified persons will service the installation, grounded conductors in multiconductor cables shall be permitted to be permanently identified at their terminations at the time of installation by a distinctive white marking or other equally effective means. Exception No. 4: The grounded conductor of a mineral-insulated, metal-sheathed cable shall be identified at the time of installation by distinctive marking at its terminations. 70-32 NATIONAL ELECTRICAL CODE For aerial cable, the identification shall be as above, or by means of a ridge so located on the exterior of the cable as to identify it. Wires having their outer covering finished to show a white or natural gray color but having colored tracer threads in the braid, identifying the source of manufacture, shall be considered as meeting the provisions of this section. (b) Sizes Larger than No. 6. An insulated grounded conductor larger than No. 6 shall be identified either by a continuous white or natural gray outer finish along its entire length or at the time of installation by a distinctive white marking at its terminations. Multiconductor flat cable No. 4 or larger shall be permitted to employ an external ridge on the grounded conductor. Exception: Where the conditions of maintenance and supervision assure that only qualified persons will service the installation, grounded conductors in multiconductor cables shall be permitted to be permanently identified at their terminations at the time of installation by a distinctive white marking or other equally effective means. (c) Flexible Cords. An insulated conductor intended for use as a grounded conductor, where contained within a flexible cord, shall be identified by a white or natural gray outer finish or by methods permitted by