UL-1681:2012 pdf free download – STANDARD FOR SAFETY Wiring Device Configurations.
The most recent designation of ANSI/UL 1681 as an American National Standard (ANSI) occurred on April 10, 2012. ANSI approval for a standard does not include the Cover Page, Transmittal Pages, Title Page, or effective date information.
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1 .1 These configurations cover attachment plugs, receptacles, cord connectors, some forms of current taps, and flatiron and appliance plugs — all for use in accordance with the National Electrical Code (NEC), ANSI/NFPA-70.
1.2 These configurations do not cover devices rated at more than 200 A or for more than 600 V.
1 .3 This standard does not cover devices having NEMA configurations in accordance with Wiring Devices
— Dimensional Specifications, ANSI/NEMA WD6.
2 General
2.1 The information given in (a) — (h) applies to each configuration in Sections Cl — C3.
a) All dimensions are in inches.
b) Decimal dimensions without tolerances shall be subject to a ±0.005 inch tolerance.
c) Angular dimensions without tolerances shaU be subject to a ±1/2 degree tolerance.
d) Where two values are given for the same dimension, the larger is the maximum value and the smaller the minimum value.
e) Leading edges of plug blades shall be free of burrs and sharp edges.
f) A contour, face dimension, yoke construction, or mounting ears and dimensions for any receptacle construction that is shown depicts an acceptable construction; other constructions may also be acceptable if tested and found to be equivalent.
g) A relationship of contact nibs, recess of contacts, or internal construction in a receptacle that is shown depicts an acceptable construction; other constructions may also be acceptable if tested and found to be equivalent.
h) Terminal Identification shall comply with the following:
1) The grounded terminal shall be identified in the Figures by the letter “W”.
2) The grounding terminal shall be identified in the Figures by the letter “G”.
3) Other conductors need not be identified, but if they are, the letters “X”, “‘i”, and “Z” shall be used for identification according to the following convention:
i) Viewing the blade end of the plug and proceeding counter-clockwise, starting from the grounding blade (G), or in the absence of a grounding blade, the grounded blade (W), the terminals shall be marked in sequence “X”, “‘1”, and