UL 773-2016 pdf download

UL 773-2016 pdf download.Plug-In Locking Type Photo controls for Use with Area Lighting.
21.3 Within 5 minutes after completion of the spray test, the control unit shall be tested in accordancewith Dielectric Voltage-Withstand Test,Section 32.
21.4 A shorting plug, an open-circuit plug, and a control receptacle shall comply with the requirements in21.1 and 21.2.
21.5 A sealing gasket provided with a control unit,or a shorting or open-circuit plug, as a weather sealfor the junction made with a control receptacle shall be evaluated by the requirements in 21.6-21.9.
21.6 A gasket of an elastomeric or thermoplastic material or a composition gasket utilizing an elastomericmaterial, used as a weather seal for the junction between a control unit or a shorting or open-circuit plugand a control receptacle,shall be resistant to aging as determined by the accelerated-aging testsdescribed in 21.7 or 21.8.
21.7 A gasket of rubber or neoprene, or a composition thereof, is to be placed for 70 hours in a ful-draftcirculating-air oven at a temperature of 100 12℃(212土3.6°F).The gasket is considered resistant to agingif there is no visible evidence of deterioration such as softening, hardening, or cracking after flexing.
21.8 A gasket of thermoplastic material, or a composition thereof, may be accepted after consideration ofthe effects of heat aging, distortion under conditions of use, and the means of securing the gasket to thecover or enclosure.
21.9 The adhesive cement used to secure the gasket shall be adequately resistant to aging asdetermined by exposing a sample of the enclosure with the gasket cemented in place, to a temperatureof 100℃(212°F) for 72 hours. The adhesive cement is considered to be adequately resistant to aging ifthere is no visible evidence of the gasket to peel oft, or to be dislodged from the original position of thegasket during and after this test.
22 Exposure to Ultraviolet and Water Test
22.1 A polymeric enclosure of a control unit shall be capable of withstanding 360 hours of exposure toultraviolet radiation, without adversely affecting its impact resistance, by subjecting three samples of theenclosure to the test procedure described in 22.2 and 22.3, followed by the impact test described in 24.2and 24.3.
22.2 The enclosure samples are to be exposed to ultraviolet light from a radiation means, such as twocarbon arcs formed between vertical electrodes,1/2 inch (12.7 mm) in diameter, located at the center ofa movable，vertical metal cylinder，31 inches (787 mm) in diameter and 17-3/4 inches (451 mm) high.Each arc is to be enclosed by a clear globe of No.Px Pyrex glass, or equivalent.
22.3 The samples are to be mounted on the inside of the cylinder, in such a manner that only the externalsurface of the enclosure is exposed to ultraviolet radiation. The cylinder is to be rotated about the arcs atone revolution per minute.A system of nozzles is to be provided so that each sample can be sprayed, intum, with water as the cylinder revolves. The operating cycle is to consist of 102 minutes of light only and18 minutes of light and water. The temperature within the cylinder, while the apparatus is in operation, isto be 63.0 土5.0°C (145,4土9.0°F), and the test is to be continued for 360 hours.
22.4 A shorting or open-circuit plug shall comply with the requirements of 22.1-22.3.23 Exposure to Humid Atmosphere Test
23.1 A control unit shall resist the absorption of moisture when subjected to a humid atmosphere for notless than 168 hours by exposing a control unit, firmly secured to a control receptacle, to air at a relativehumidity of 96 12 percent, at a temperature of 50 +2°C(122±4%F). The sample is then to be removedfrom the humidity chamber and, within 1 minute of removal, subjected to the Dielectric Voltage-WithstandTest described in Dielectric Voltage-Withstand Test, Section 32.
24 Exposure to Low Temperature Test
24.1 A polymeric enclosure of a control unit shall be capable of withstanding exposure to low temperaturefor 72 hours by exposing a complete control unit to an ambient temperature of minus 29.0C (minus20.2°F). At the end of the 72 hours, the complete assembly is to be removed from the cold chamber andthe control unit enclosure is to be visually inspected for cracks.Following the visual inspection, and within1 minute of removal from the cold chamber, the control unit is to be subjected to an impact of 1 ft-lbf (1.36N-m) by means of a solid, smooth,steel sphere，2 inches (50.8 mm) in diameter, applied to externalsurfaces.
24.2 The sphere mentioned in 24.1 is to be allowed to fall freely, from rest, through the distance requiredto cause the specified impact upon the surface under test. For surfaces other than horizontal, the spheremay be suspended by a cord and allowed to fall as a pendulum through the required distance. The controlunit is to be inserted into a mating control receptacle, which is rigidly held in place during the impact test.