UL-676:2015 pdf free download – STANDARD FOR SAFETY Underwater Luminaires and Submersible Junction Boxes.
11 Power Supply Connections
11.1 General
11.1.1 A dry-niche luminaire and the luminaire housing for a wet-niche luminaire, and the mounting bracket for a no-niche luminaire, shall have provision for the connection of rigid metal or nonmetallic conduit.
11.1.2 Holes for the connection of conduit shall be threaded. When the threads are tapped all the way through a hole in an enclosure wall, or when an equivalent construction is used, there shall not be fewer than 3-1/2 nor more than five threads in the metal and the construction shall be such that a conduit bushing can be attached as intended. When the threads are not tapped all the way through a hole in an enclosure wall, conduit hub, or the like, there shall not be fewer than five threads in the metal and there shall be a smooth, rounded inlet hole for the conductors equivalent to that provided by a standard conduit bushing. The internal diameter of the inlet hole shall be the same as that of the corresponding trade size of rigid conduit.
11.1.3 A conduit hub shall be threaded and shall have a wall thickness before threading not less than that of the corresponding trade size of conduit. A conduit hub that is not cast integrally with an enclosure shall not depend upon friction alone to prevent its turning. The hub shall additionally be capable of withstanding the specified torque applied to a short length of rigid metal conduit threaded into the hub in the intended manner, without turning in the enclosure and without stripping any threads. The enclosure shall be rigidly mounted or supported. For the 3/4-inch and smaller trade sizes, the applied torque shall be 90.4 Nm (800 pound-inches); for the 1, 1-1/4, and 1-1/2 inch trade sizes, 113.0 Nm (1000 pound-inches); and for the 2-inch and larger sizes, 180.8 Nm (1600 pound-inches).
11.1.4 The termination means for a field-connected conductor shall consist of a pigtail lead, a pressure terminal connector, a wire-binding screw, or a stud with nut. A pressure terminal connector shall be of a type that can be applied by means of an ordinary tool (such as a screwdriver, nut driver, or pliers).
11.1.5 A pigtail lead for connection of field wiring shall not be more than two standard (AWG) sizes smaller than the field-connected conductor to which it will be connected, and shall not be smaller than a 0.82 mm2 (18 AWG) copper conductor in any case.
11.1.6 A pigtail lead shall have a free length in a splice compartment of at least 15.2cm (6 inches).
11 .1.7 A field-wiring terminal shall be provided with a pressure terminal connector securely fastened in place by being brazed, bolted, held by a screw, or the equivalent. A single rivet shall not be used.
Exception: A wire-binding screw is not prohibited from being used at a field-wiring terminal intended to accommodate a 5.3 mm2 (10 AWG) or smaller conductor.
11 .1 .8 A field-wiring terminal shall be prevented from turning or shifting in position by means other than friction alone. Acceptable means of complying with this requirement include use of two screws or rivets, square shoulders or mortises, dowel pins, lugs, offsets, or connecting straps or clips fitted into an adjacent part, or by an equivalent method.