UL-1682:2017 pdf free download – STANDARD FOR SAFETY Plugs, Receptacles, and Cable Connectors of the Pin and Sleeve Type.
4.3.14 The internal insulating systems of components for which component requirements exist need not comply with the requirement in Clauses 5.3- 5.5.
4.3.15 A small part meeting all the fllowing criteria need not comply with the requirements in Clauses 5.3- 5.5:
a) Its volume does not exceed 2 cm3 (0. 122 cubic inch);
b) Its maximum dimension does not exceed 3 cm (1.18 inches); and
c) Its location is such that it cannot propagate flame from one area to another or act as a
bridge between a possible source of ignition and other ignitable parts.
4.3.16 Fiber and similar material that is equal to or less than 0.25 mm (0.010 inch) thick need not comply with the requirements in Clauses 5.3- 5.5.
4.3.17 A polymeric material used for electrical insulation, an internal barrier necessary to maintain electrical clearances and creepage distances, or enclosure of live parts shall have the temperature index ratings shown in Table 2 for the specific application of the insulating material.
4.4 Resistance to corrosion
4.4.1 Parts of iron or steel other than stainless steel parts shall be protected against corrosion, in accordance with Clause 5.28.
4.5 Enclosures
4.5.1 General
4.5.1.1 An enclosure shall be constructed to reduce the risk of unintentional contact with uninsulated live parts, as indicated in Clause 4.8.1, and to provide internal parts with protection from specified extermal conditions. Additional items used to form an enclosure, such as adapters, hoods, covers, and the like, may be permanently secured to the device. In Canada, elements of metallic enclosure systems such as outlet boxes and mounting panels shall be provided with a bonding terminal.
4.5.2 Mechanical strength
4.5.2.1 An enclosure shall have adequate strength and rigidity in accordance with Clauses 5.13 and 5.14.
4.5.3 Nonmetallic enclosures
4.5.3.1 A nonmetallic enclosure or a nonmetalic part of an enclosure shall comply with the applicable
requirements in UL 746C, CAN/CSA-C22.2 No. 94, or NMX-J-/2-ANCE for Special Purpose Enclosures.
4.5.3.2 In Canada and the United States, if a nonmetallic enclosure is identified as being intended to be
exposed to specific chemicals, oils, acids, solvents, cleaning agents, and the like, the performance of the
enclosure material shall not be adversely affected by such substances as determined by applicable tests
as described in UL 746A or CAN/CSA-C22.2 No.0.17.
In Mexico, this requirement does not apply.
4.5.3.3 Pliable, molded natural or synthetic rubber, or a combination thereof, or a pliable composition, the basic constituent of which is vinyl chloride or a copolymer of vinyl chloride and vinyI acetate, in the finished device that complies with Clause 5.2, may be employed as an insulating material for the enclosure of an attachment plug or a cord connector.
4.5.3.4 In Mexico, a product with a nonmetallic enclosure or a nonmetallic part of an enclosure shall comply with the applicable tests of this standard.
4.5.4 Metlic enclosures
4.5.4.1 In Canada and the United States, an enclosure may be constructed of iron, steel, copper, brass, zinc, aluminum, or their alloys. Aluminum alloys containing less than 80 percent aluminum shall not be used. Magnesium and its alloys shall not be used.
In Mexico, an enclosure may be constructed of iron, steel, copper, brass, zinc, aluminum, or their alloys.
Magnesium and its alloys shall not be used. Aluminum alloys containing less than 80 percent aluminum shall not be used – this shall be determined by manufacturer’s declaration.
4.5.4.2 Zinc or a zinc-based alloy shall not be used for an enclosure or parts of an enclosure which are in the primary grounding/bonding path.