UL 2846-2021 pdf free download

UL 2846-2021 pdf free download.Fire Test of Plastic Water Distribution Plumbing Pipe for Visible Flame and Smoke Characteristics. 3.3 Temperature measurement 3.3.1 An 18 AWG thermocouple [nominal wire cross section of 1620 cmil (0.823 mm 2 )] with 0.375±0.125 inch (10 ±3 mm) of the junction exposed in the fire chamber air is to be inserted through the floor of the test chamber so that the tip is 1.0 ±0.031 inch (25 ±1 mm) below the top surface of the gasketing tape and 23 feet ±1/2 inch (7.09 m ±13mm) from the centerline of the burner ports, and at the center of the width of the chamber. 3.3.2 An 18 AWG thermocouple [nominal wire cross section of 1620 cmil (0.823 mm 2 )] embedded 1/8 inch (3.2 mm) below the floor surface of the test chamber is to be mounted in refractory or Portland cement (carefully dried to keep it from cracking) at distances of 13-1/2 and 23 feet (3.96 and 7.09 m) from the fire end of the burner ports. 4 Test Specimens 4.1 Two 24 foot (7.32 m) lengths of plastic pipe, less than or equal to 4 inches (10.2 cm) inside diameter, if uninsulated, less than or equal to 5 inches (12.7 cm) outside diameter, if an insulated pipe assembly, are to be installed in the bottom of the tray. The specimen is to be laid in the center of the tray with a minimum separation between the individual pipes of 0.5 inches (12.7 mm). There shall be no water or any other liquid in the pipe during the test. 4.2 The pipe specimen is to be placed on a mesh screen in the tray. The mesh screen is galvanized wire cloth with 0.047 inch (1.2 mm) wire diameter and having 3/4-inch (19-mm) openings. The two lengths of pipe are to be fastened to the screen with fasteners as described in 4.3. 4.3 Bare copper tie wires not larger than 18 AWG [nominal wire cross section of 1620 cmil (0.823 mm 2 )] are to be used to fasten the specimen to the mesh screen and rungs of the tray wherever a tie is required to keep a specimen in contact with the rung and to minimize movement during the test. A tie is not to be used in any manner that alters the ability of the specimen to transmit gases and/or vapor longitudinally through the core...