UL 5C-2016 pdf download
UL 5C-2016 pdf download.Surface Raceways and Fittings for Use with Data,Signal, and Control Circuits.
17 Impact Test
17.1 The finished cover and the raceway or fitting base on which it is intended to be used shall be subjected to a single vertical impact as described in 17.2 and 17.3. The impact is to be applied by means of a solid smooth steel sphere 2.0 in (50.8 mm) in diameter and weighing 1.18 lb (0.535 kg), falling through a distance of 51 in (1.3 m). The insulated conductors shall not be visibly damaged and shall not be short-circuited to one another or to the raceway or fitting base (when constructed of metal) as signaled by a buzzer, a lamp, or other indicator.
17.2 Six assemblies, each one consisting of an 18-in (457-mm) length of the raceway cover and base, or one fitting cover and base, are to be installed as intended onto 6-in (150-mm) sections of raceway. In each case, the assembly is to be mounted on a piece of plywood that is nominally 3/4-in (19-mm) thick. Insulated conductors are to fill the base as intended, and the cover is to be secured in place on the base as intended. Three assemblies are to contain the largest number of the largest size conductor for which the raceway is intended. Three assemblies are to contain the largest number of the smallest size conductor for which the raceway is intended with one of the small conductors in each case routed diagonally across the rest of the small conductors at an angle of approximately 30 degrees and centered under the point on the cover that is to be struck by the impact sphere.
17.3 The assemblies are to be placed on a concrete floor with the plywood horizontal for three of the assemblies and vertical for the three remaining assemblies. The impact is to be directed vertically downward onto the center of the uppermost surface.
Exception: An assembly, with the plywood in the vertical orientation, that is incapable of being impacted on the center of its uppermost surface, is to be impacted with the steel sphere positioned tangential to the mounting surface.
18 Flammability Test
18.1 A finished nonmetallic part shall:
a) Be classified as V-0 or V-i (small-scale flame-test rating) according to the Standard for
Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94, and at
least the same thickness in which the material qualified as V-O or V-i or
b) Not flame longer than 60 seconds following two 30-second applications of the test flame, the period between applications being 60 seconds. The part shall not emit flaming or glowing
particles or flaming drops at any time that ignite the cotton layer. Flameless charring of the
cotton is to be ignored. The part shall not be completely consumed. The test is to be conducted as described in 18.2 — 18.6.
18.2 Three 12-in (305-mm) lengths of raceway or three fittings are to be subjected to this test. The test specimens are to be conditioned in a full draft air-circulating oven for 7 days at 70.0 ±1.0°C (158 ±1.8°F) and then maintained at 23.0 ±2.0°C (73.4 ±3.6°F) and 50 ±5 percent relative humidity for a minimum of 4 hours prior to testing.
18.3 A laboratory type burner having a tube with a length of 3.94 ±0.39 in (100 ±10 mm) and an inside diameter of 0.374 ±0.012 in (9.5 ±0.3 mm) is to be used. The barrel is not to be equipped with any end attachments, such as stabilizers. The burner shall comply with Standard Specification for Laboratory Burner Used for Small-Scale Burning Tests on Plastic Materials, ASTM D 5025. Adjust the burner to produce a 3/4 in nominal (20 ±1 mm) yellow-tipped blue flame. Increase the air supply until the yellow tip just disappears. Measure the height of the flame again and readjust it as necessary. The test flame shall be calibrated in accordance with the Standard Practice for Confirmation of 20-mm (50-W) and 125-mm (500-W) Test Flames for Small-Scale Burning Tests on Plastic Materials, ASTM D 5207, at least once a week and when the gas supply is changed, test equipment is replaced, or when data is questioned.
