The repair of hard-service cord (see Column 1, Table

400-4) Nos. 14 and larger shall be permitted if conductors are spliced in accordance with Section 110-14(b) and the completed splice retains the insulation, outer sheath properties, and usage characteristics of the cord being spliced. 400-10. Pull at Joints and Terminals. Flexible cords shall be so connected to devices and to fittings that tension will not be transmitted to joints or terminals. (FPN): Some methods of preventing pull on a cord from being transmitted to joints or terminals are (1) knotting the cord, (2) winding with tape, and (3) fittings designed for the purpose. ARTICLE 400 - FLEXIBLE CORDS AND CABLES 70-321 400-11. In Show Windows and Show Cases. Flexible cords used in show windows and show cases shall be Type AFS, S, SE, SEO, SEOO, SJ, SJE, SJEO, SJEOO, SJO, SJOO, SJT, SJTO, SJTOO, SO, SOO, ST, STO, or STOO. Exception No. 1: For the wiring of chain-supported lighting fixtures. Exception No. 2: As supply cords for portable lamps and other merchandise being displayed or exhibited. 400-12. Minimum Size. The individual conductors of a flexible cord or cable shall not be smaller than the sizes in Table 400-4. 400-13. Overcurrent Protection. Flexible cords not smaller than No. 18, and tinsel cords or cords having equivalent characteristics of smaller size approved for use with specific appliances, shall be considered as protected against overcurrent by the overcurrent devices described in Section 240-4. 400-14. Protection from Damage. Flexible cords and cables shall be protected by bushings or fittings where passing through holes in covers, outlet boxes, or similar enclosures. B. Construction Specifications 400-20. Labels. Flexible cords shall be examined and tested at the factory and labeled before shipment. 400-21. Nominal Insulation Thickness. The nominal thickness of insulation for conductors of flexible cords and cables shall not be less than specified in Table 400-4. 400-22. Grounded-Conductor Identification. One conductor of flexible cords that is intended to be used as a grounded circuit conductor shall have a continuous marker readily distinguishing it from the other conductor or conductors. The identification shall consist of one of the methods indicated in (a) through (f) below. (a) Colored Braid. A braid finished to show a white or natural gray color and the braid on the other conductor or conductors finished to show a readily distinguishable solid color or colors. (b) Tracer in Braid. A tracer in a braid of any color contrasting with that of the braid and no tracer in the braid of the other conductor or conductors. No tracer shall be used in the braid of any conductor of a flexible cord that contains a conductor having a braid finished to show white or natural gray. Exception: In the case of Types C and PD, and cords having the braids on the individual conductors finished to show white or natural gray. In such cords, the identifying marker shall be permitted to consist of the solid white or natural gray finish on one conductor, provided there is a colored tracer in the braid of each other conductor. 70-322 NATIONAL ELECTRICAL CODE (c) Colored Insulation. A white or natural gray insulation on one conductor and insulation of a readily distinguishable color or colors on the other conductor or conductors for cords having no braids on the individual conductors. For jacketed cords furnished with appliances, one conductor having its insulation colored light blue, with the other conductors having their insulation of a readily distinguishable color other than white or natural gray. Exception: Cords that have insulation on the individual conductors integral with the jacket. It shall be permissible to cover the insulation with an outer finish to provide the desired color. (d) Colored Separator. A white or natural gray separator on one conductor and a separator of a readily distinguishable solid color on the other conductor or conductors of cords having insulation on the individual conductors integral with the jacket. (e) Tinned Conductors. One conductor having the individual strands tinned and the other conductor or conductors having the individual strands untinned for cords having insulation on the individual conductors integral with the jacket. (f) Surface Marking. One or more stripes, ridges, or grooves so located on the exterior of the cord as to identify one conductor for cords having insulation on the individual conductors integral with the jacket. 400-23. Equipment Grounding-Conductor Identification. A conductor intended to be used as an equipment grounding conductor shall have a continuous identifying marker readily distinguishing it from the other conductor or conductors. Conductors having a continuous green color or a continuous green color with one or more yellow stripes shall not be used for other than equipment grounding purposes. The identifying marker shall consist of one of the methods in (a) or (b) below. (a) Colored Braid. A braid finished to show a continuous green color or a continuous green color with one or more yellow stripes. (b) Colored Insulation or Covering. For cords having no braids on the individual conductors, an insulation of a continuous green color or a continuous green color with one or more yellow stripes. 400-24. Attachment Plugs. Where a flexible cord is provided with an equipment grounding conductor and equipped with an attachment plug, the attachment plug shall comply with Sections 250-59(a) and (b). C. Portable Cables Over 600 Volts, Nominal 400-30. Scope. This part applies to multiconductor portable cables used to connect mobile equipment and machinery. 400-31. Construction. (a) Conductors. The conductors shall be No. 8 copper or larger and shall employ flexible stranding.