UL 676-2015 pdf download – Underwater Luminaires and Submersible Junction Boxes.
6 General 6.1 A luminaire shall be constructed to provide mechanical strength appropriate for the stress it is likely to encounter during installation and use. 6.2 A luminaire shall be constructed to provide an enclosure for all electrical parts, including the lamp bulb. Exception No. 1 : The lens face of a PAR lamp is not required to be enclosed. Exception No. 2: Flexible cord, attachment plugs, receptacles, and cord connectors are not required to be enclosed in an electrical enclosure when the luminaire and its installation complies with requirements for Flexible Cord and Connectors, Section 1 0. 6.3 A luminaire rated more than 1 5 volts and provided with a PAR lamp shall be provided with a guard, grid, or an outer lens. 6.4 A luminaire intended to be mounted facing upward shall have the lens guarded to prevent contact by any person. 6.5 All metal parts of a luminaire, including assembly rivets, screws, and the like, shall be of a corrosion resistant metal. Copper alloy parts normally in contact with water shall have a zinc content not in excess of 1 5 percent. Aluminum and aluminum alloys shall not be used for any part of a luminaire normally in contact with water. Iron and steel parts made resistant to corrosion by plating, galvanizing, or equivalent means are permitted. Exception No. 1 : Metal parts that are completely encapsulated by a potting compound that complies with the Outline of Investigation for Potting Compounds for Swimming Pool, Fountain, and Spa Equipment, UL 676A, need not be corrosion resistant.
6.6 Paint, enamel, or other coatings that inhibit bonding of parts or reduce the electric-field shielding effect (where required) shall not be used on either the inside or the outside of a luminaire. 6.7 Tin-lead solder shall not be used for the fastening of seams or the assembly of parts of a luminaire. 6.8 Self-threading or sheet-metal screws shall not be used. 6.9 An external power unit or transformer for a low voltage swimming pool and spa luminaire shall comply with the Standard for Power Units for Fountain, Swimming Pool, and Spa Luminaires, UL 379. 7 Sheet Metal 7.1 The thickness of sheet metal in a luminaire enclosure shall be not less than 1 mm (0.040 inch) at any point where a conduit hub is secured, and not less than 0.5 mm (0.020 inch) at any other point on a drawn or spun luminaire. The thickness of sheet metal in a drawn or spun luminaire shall be such as to provide strength and rigidity at sealing points, or shall be reinforced to provide strength equivalent to that of sheet metal not thinner than 1 mm. 8 Cast Metal 8.1 Cast metal in a luminaire enclosure shall have a minimum thickness in accordance with Table 8.1 .