UL 183:2016 pdf free download – STANDARD FOR SAFETY Manufactured Wiring Systems.
11 .6 An enclosure shall be constructed as follows:
a) If intended for use in ducts used for environmental air-handling, there shall be no openings. An enclosure shall be constructed of metal.
b) If intended for use in environmental air-handling spaces (plenums), other than ducts, openings in the enclosure that are not closed during the assembly shall comply with the following:
1) The largest dimension of an opening shall not be more than 1/4 inch (6.4 mm) and the smallest dimension shall not be more than 1/16 inch (1.6 mm);
2) There shall be a maximum of five openings in any one side or end of the enclosure and the total area of all openings shall not be more than 0.2 square inch (1.3 cm2); and
3) There shall be a maximum of 15 openings in the enclosure and the total area of all openings shall not be more than 0.5 square inch (3.2 cm2); and
4) Enclosures molded of polymeric materials shall comply with the Standard for Fire
Test for Heat and Visible Smoke Release for Discrete Products and Their Accessories
Installed in Air-Handling Spaces, UL 2043.
5) In addition to the requirements of Section 22A, Mating Connectors, mating
connectors molded of polymeric materials shall also comply with the Standard for Fire
Test for Heat and Visible Smoke Release for Discrete Products and Their Accessories
Installed in Air-Handling Spaces, UL 2043.
c) An enclosure not intended for use in environmental air-handling spaces shall comply with the following:
1) The largest dimension of an opening shall not be more than 1/4 inch (6.4 mm) and the smallest dimension shall not be more than 1/16 inch (1.6 mm);
2) There shall be a maximum of five openings in any one side or end of the enclosure and the total area of all openings shall not be more than 0.2 square inch (1 .3 cm2);
3) There shall be a maximum of 15 openings in the enclosure and the total area of all openings shall not be more than 0.5 square inch (3.2 cm2).
11 .7 An interconnecting cable or other component shall be constructed so that the wire terminations will not be stressed when the complete device is extended to its maximum length.
11.8 Each manufactured wiring system shall be provided with a means for capping any unused connector opening in the field. The cap for each connector shall be secured by screws, bolts and nuts, or other positive means; or a snap-fit method that complies with the Cap Separation Test, Section 42. Caps shall be provided with each assembly, or may be provided as an accessory kit when specified in the installation and operating instructions in accordance with 46.5.
Exception: A manufactured wiring system connector that complies with Section 26, Accessibility to Uninsulated Live Parts, need not be provided with a means to cap unused connector openings. The installation instructions shall contain a statement to in form the user that caps are not required in accordance with 46.6.
11.9 A cap made of sheet metal shall have a thickness not less than the values specified in Table 11.1. A polymeric cap that does not contact live parts shall have the strength to resist the mechanical stresses to which it is subjected during intended use of the product and have a minimum HB rating. Polymeric caps that contact live parts shall comply with the requirements for direct support and enclosure of live parts in the Standard for Polymeric Materials – Use in Electrical Equipment Evaluations, UL 746C, as specified in the table for material property considerations.
11.10 Receptacles mounted to and supported by a cover shall be provided with more than one securement point for the receptacle.
11.11 A receptacle outlet of the type specified in 3.7 installed so that access to the manufactured wiring assembly connector(s), is not accessible without first removing an access cover shall be subjected to either the Overload or Current Cycling Test. The installation instructions shall be used to determine the recommended installation configuration. See Figure 11 .1.
Exception: A receptacle outlet of the feed through type when installed as described above shall be subjected to Temperature and Overload Tests.