UL 510-2020 pdf free download

UL 510-2020 pdf free download.Polyvinyl Chloride , Polyethylene , and Rubber Insulating Tape.
5.2 The tape shall not ignite combustible materials in its vicinity or damage more than 25% of the indicator flag during, between, or after the five applications of the test flame. The test shall be conducted as described in 5.4—5.15.
5.3 The testing of the 19 mm (0.75 inch) specimen width is considered representative of the performance of all sizes (widths) of the tape. Sample set of three specimens shall be tested.
5.4 The test specimen is to be prepared as follows. A straight clean steel rod 460 mm (18 inches) long and 3.2 mm (0.125 inch) in diameter is to be supported in a winding jig. The winding jig is to support the rod at each end and have a crank for rotating the rod so that the tape can be wound thereon. The winding jig is to be attached to a rigid support in such a manner that it can be rotated, tilting the major axis of the rod to the horizontal. A 900 mm (3 feet) length of 19 mm (0.75 inch) tape Is to be cut from a roll. The tape sample is to be secured, by overlapping the first turn of tape, to the rod held in a horizontal position. A weight exerting 2.0 kgf (4.4 lbf) is then to be attached to the free end of the 900 mm (3 feet) sample to provide tension. After 1 minute under tension, the rod is to be slowly rotated, and the fixture tilted so that the tape wraps with an overlap equal to one half the width of the tape. After wrapping is completed, the lower end of the tape to be secured and the remaining length of tape is to be cut off. A second wrapping is to be similarly applied with the direction of advance of the turns of the tape reversed from that of the first wrapping. Finally, a third wrapping of tape is to be similarly applied with the direction of advance opposite to that of the second wrapping. Thus, six thicknesses of tape are to result at each point along the wrapped mandrel.
5.5 A strip of unreinforced 94 g/m2 (60 Ib) kraft paper that is 13 mm (0.5 inch) wide, approximately 0.1 mm (0.004 inch) thick, and is gummed on one side is to be used to make an indicator flag. The gumming is to be moistened but not more than necessary to facilitate adhesion. With the gum toward the specimen. the strip is to be wrapped around the specimen once with its lower edge 254 mm (10 inches) above B. the point at which the blue inner cone is to touch the specimen. The ends of the strip are to be pasted together evenly and trimmed to provide a flag that projects 19 mm (0.75 inch) from the specimen toward the rear of the enclosure with the flag parallel to the sides of the enclosure (see Fiqure 5.1). The lower clamp or other support for the specimen is to be adjusted vertically to keep it from being any closer than 76 mm (3 inches) to point B.UL 510-2020 pdf free download.