UL 187

1 Identification and Wiring
11.1 A terminal on a device which is identified for the connection of either a grounded conductor, or a grounding conductor shall be correctly connected to the corresponding identified conductor of the cord.
11.2 If a flexible cord is assembled to a fitting that has any of the configuration contacts as illustrated in Figures C1.1-C1.38, C2.1-C2.42, and C3.1-C3.8, both of the following conditions shall be met:
    a) The conductor in the cord that
          1) is finished to show a white or natural grey color,
          2) is covered by a white or natural grey braid, or
          3) is equivalently identified by
               ⅰ) a white or natural grey separator,
               ⅱ) a stripe, ridge, or groove on the outside surface of the insulation or
               ⅲ) a tin or other white metallic coating on each strand
    shall be connected either to the contact designated by the letter W in the illustration (signifying the grounded circuit conductor), or, if there is no contact designated W in the illustration, to a contact designated X, Y, or Z or to any contact that is not designated by a letter.
    b) The conductor in the cord that either:
          1) is green with or without one or more yellow stripes, or
          2) is covered by a green braid with or without one or more yellow tracers
     shall be connected only to the contact designated by the G in the illustration (signifying the grounding conductor).
Exception: The grounded conductor (item a) of a power-supply cord or a single-outlet cord set may have light blue colored or light blue coated insulation if :
a) The cord has a jacket that is not integral with the circuit conductor insulation,
b) The power-supply cord or cord set is to be factory installed in, or packaged with, an appliance, and
c) The shipping package is marked in accordance with 15.5.

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