UL 514C:2005 pdf download – Nonmetallic Outlet Boxes, Flush-Device Boxes, and Covers.
48.3 Three covers are to be mounted on plywood with a 1/32 inch (0.8 mm) diameter wooden rod, which may project 1/2 Inch (12.7 mm) beyond the edge 01 the cover, between the cover and the plywood at the center of each side, The compound is to be applied around the cover, The assemblies are to be conditioned for 24 hours at minus 20°C (minus 4°F) in circulating air. Following the conditioning. each assembly is to be investigated to determine whether It complies with the requirements In 48.1.
483 revised Novonter 13. 2002
49 Gaskets
49.1 After conditioning as described in 49.2, the thickness of a specimen of an expanded (foam) closed-cell rubber gasket shall not be less than 50 percent of the original deflection.
49.2 Three specimens, each 1.14 ±0.02 inch (29.0 ±0.5 mm) in diameter and 0.50 ±0.02 inch (1.7 ±0.5 mm) thick are to be prepared. using as many thicknesses of the material as necessary, Each specimen is to be conditioned for 24 hours at a temperature of 23 ±2°C (73 ±4°F) while compressed by one-third its original thickness between flat steel plates. At the end of this period, the specimens are to be removed from between the compression plates. Alter an additional 24 hours, the thickness Is to be measured at the center of each specimen.
50 ResIstance to MoIsture
50.1 General
50.1.1 When tested as described in 50.1.3 — 50.3.3, a part or an assembly of parts as mentioned in 5.4.1
— hereinafter referred to as the test assembly — shall exclude water from:
a) The enclosure formed by a box and a cover, and
b) The interior of a wiring device.
50.1.1 revised November 13, 2002
50.1.2 One or more passages need to be provided In the portion of the wiring device enclosed by the box and cover in order to determine whether water has entered the interior of a wiring device, as referenced in 50.1.1(b). The passages will allow any water entering the wiring device to be drained. These passages are to be blocked with putty or similar material during the required tests. The putty is to be removed after the test and any water that entered the wiring device be drained.
50,1.2 revised November 13, 2002
50.1.3 The test assembly is to be installed as intended in actual Service fl accordance with the assembly and installation instructions. When the instructions do not include specific details, the cover is to be installed in the manner that maximizes the potential for entry of water. The interior of the test assembly is to be vented to the exterior to equalize the atmospheric pressure during the test. The vent is to be protected so that water is unable to enter. All parts intended for use with the part under test, or that are required to complete the enclosure are to be employed for the test — for example, wiring devices, gaskets, boxes for covers, etc A cover intended for use with a box mounted in a wall is to be tested employing a wall of the most severe irregular surtace not dearty prohibited by the assembly or installation instructions
— such as a wall of fieldstone, corrugated siding, flagstone, textured face brick, common brick, grooved siding, flat or drop striated siding, flat or drop embossed siding, flat or drop textured siding. flat or drop smooth siding or a similar material,
502 AssemblIes for use In wet locations and wet locations with cover closed
50.2.1 The test assembly is to be located 3-feet (0.9 m) horizontally from and 2-feet (0.6 m) above a spray head as illustrated in Figure 80.1. The spray head is to be positioned so that the spray is aimed directly at the test assembly. The water pressure is to be maintained at 15 pounds per square Inch 1103.3 kilopascals (kPa)J. The cover, the guard. the shield, or the like is to be opened completely and then allowed to assume its natural position; that is, a sell-closing covec is to be allowed to close; however, a cover with a detent or other feature designed to hold II open is not to be manually closed. It the wiring device employed is a receptacle, the test is to be conducted without an attachment plug in the receptacle. The spray is to be apØied for 1 hour. Following the spray, the test assembly is to be examined to determine whether It complies with the requirements in 50.1.1.