UL 1990-2013 pdf download

UL 1990-2013 pdf download.Nonmetallic Underground Conduit with Conductors.
9 IdentIfication of Compounds
9.1 An HDPE material used in conduit shall be subjected to the Infrared Spectroscopy (IR), Thermogravimetry (TGA), and Differential Scanning Calorimetry (DSC) Tests specified in the Standard for Polymeric Materials — Short Term Property Evaluations, UL 746A.
10 Water Absorption Test
10.1 Finished conduit shall have a macimum ratio, WW1, of 1.0015 after immersion in distilled water for 24 hours (see 10.3). The test is to be as indicated in 10.2 — 10.4 (similar to the method described as Procedure A In the Standard Test Method for Water Absorption of Plastics, ASTM 0 570).
10.2 Specimens are to be preconditioned by drying in a full-draft, circulating-air oven at a temperature of 50.0 ±3.0°C (122.0 ±5.4°F) for 24 hours, after which they are to remain in still air at room temperature for 24 hours.
10.3 A dean, dry specimen of finished conduit at least 6 inches (152 mm) long is to be preconditioned as indicated in 10,2. weighed. W1. to within 5 mg of balance, and immersed for 24 hours in distilled water that is at room temperature. The specimen is then to be removed from the water, dried quickly inside and out with a clean piece of soft lintless cloth, and immediately reweighed, W2. to within 5 mg 01 balance. W?”WI shall not be larger than indicated in 10.1.
10.4 When a specimen is known or suspected to contain appreciable amounts of water-soluble material, two specimens are to be preconditioned by drying in a full-draft circulating-air oven at a temperature of 50.0 ±3.0°C (122.0 ±5.4°F) tar 24 hours, cooled in a desiccator for 24 hours, and immediately weighed, W1. The specimens are then to be immersed in distilled water for 24 hours with the water at room temperature. Immediately following this immersion, the specimens are to be reconditioned for 24 hours in the oven at 50.0 ±3.0°C. cooled in a desiccator for 24 hours, immediately reweighed. W2. and the criteria in 10.1 applied.
11 Low Temperature Handling Test
11.1 The conduit shall not shatter, ch. or crack when tested In accordance with 11.2.
11.2 One 30-inch (760-mm) specimen is to be cut from lengths of each size of finished conduit. The ends of each specimen are to be smooth and perpendicular to the longitudinal axis of the conduit. The specimens are to be cooled in circulating air for five hours to a temperature of minus 20.0 ±1.0°C (minus 4.0 ± 1.8°F). Within 15 seconds of removal from the low temperature. each specimen is to be dropped onto a concrete floor twice in quick succession from a height of 60 inches (1.53 m). The specimen is to be dropped at an angle of approximately 45 degrees to the floor so that one end of it hits the floor first. For the second drop, the specimen is to fall parallel to the floor.
12.2.2 Measurements are to be made by means of two machinist’s micrometer calipers, each with a ratchet and a flat-ended spindle. The anvil is to be hemispherical on the caliper used for measurements of thickness and is to be ftal on the caliper used for measurements of diameter. The calibration of the scale on each caliper is to facilitate estimation of each measurement to 0.0001 inch or 0,001 mm.
12.2.3 Each tube is to be smooth and clean wherever it is touched by a spindle or anvil. While measurements are being made, each tube and the air around it are to be in thermal equilibrium with one another.
12.2.4 The wall thickness is to be measured at each end of each tube by means of the caliper wilh the hemispherical anvil. At least four measurements are required at each end to make certain that the thickest and thinnest parts of the wall are found. Each measurement is to be estimated to the nearest 0.0001 inch or 0.001 mm and recorded. The average of all of the recorded thicknesses is to be determined to the nearest 0.001 inch or 0.01 mm for each tube and recorded as T.
12.2.5 The outside diameter Is to be measured at the center and at each end of each tube by means of the caliper with the flat anvil. At least four measurements (every 45 degrees) are required at each location to make certain that the largest and smallest diameters are found. Each measurement is to be estimated to the nearest 0.0001 Inch or 0.001 mm and recorded. The average of all of the recorded diameters Is to be determined to the nearest 0.001 inch or 0.01 mm for each tube and recorded as D.