UL 2225-2013 pdf download
UL 2225-2013 pdf download.Cables and Cable-Fittings For Use ln Hazardous (Classified) Locations.
24.3 The hydrostatic pressure is to be applied at the rate of approximately 100 — 600 psig (690 — 4137 kPa) per minute until the required internal pressure is reached, Gaskets or other means may be employed if necessary to prevent leakage of water during application of pressure.
25 Dust Penetration Test
25.1 A cab4e sealing tilting for Class II locations is to be exposed to a circulating dust-air atmosphere to determine that the enclosure is dust-tight, During this test there shall be no entrance of the dust Into the box or the fitting.
Exception: A cable sealing fitting need not be exposed to the circulating dust-air atmosphere if all joints:
a) Are of the threaded type; or
b) Are ungasketed and comply with the requirements for Class I joints.
25.2 For the dust penetration test. cable sealing fillings assembled as described in 23.5 are to be used in the test, except that the lengths of inlet conduit are to be omitted,
25.3 The box or the fitting is to be installed in a test chamber to permit tree circulation of dust-air mixtures around the device. The test chamber is to be provided with a cover and with dust-air inlet and outlet connections. The fitting in the representative test enclosure is to be exposed to the dust-air atmosphere that is to be produced by auxiliary apparatus and introduced into the test chamber. The test is to be continued for at least 30 hours while the box or the fitting is continuously exposed to the circulating dust-air atmosphere.
25.4 Grain dust consisting of wheat or corn dust, or both, that has passed through a U.S.A. Standard 150 micron (100 mesh) wire cloth is to be used for the dust-air atmosphere it the box or the fitting is for use in Class II, Group F. Group G. or Groups F and G locations.
25.5 Magnesium dust, all of which has passed through a U.S.A. Standard 250 micron (60 mesh) wire cloth. 66 percent of which has passed through 150 micron (100 mesh) wire cloth, and 22 percent of which has passed through a 75 micron (200 mesh) wire cloth Is to be used for the dust-air atmosphere if the box or the fitting is (or use in Class II, Group E, Groups E and F. or Groups E. F, and G locations.
25.6 The wire cloth is to conform to the dimensional requirements of the Standard Specification for Wire-Cloth Sieves for Testing Purposes, ASTM E11.
26 Leakage of Sealing Fittings Test
26.1 A cable sealing fitting having wires sealed with compound specified for use with the fitting shall not permit the passage of more than 0007 cubic foot (0.2 L) of air per hour at a pressure of 6 indies (152 mm) of water.
262 The test is to be conducted on seals prepared at room temperature and on seals prepared at the minimum temperature specified by the manufacturer in the Installation instructions supplied with the fitting or with the sealing compound.
26.3 Regarding the number and size of wires that are to be sealed in each sealing fining, consideration is to be given to the maximum number of conductors for use in each trade size cable sealing fitting and the maximum available number of conductors for use in each trade &ze cable sealing fitting is to be used.
27 High Humidity Tests
27.1 These requirements apply to cement-type sealing compounds.
27.2 Sample cable sealing fittings, conditioned as described in 27.3, shall be subjected to Hydrostatic Pressure Tests, Section 24, and Leakage of Sealing Fittings Test, Section 26.
27.3 Cable sealing fittings prepared in accordance with 26.2 and 26.3 are to be subjected to the following environmental conditioning:
a) Sixty days at 60°C (140°F) and a relative humidity of 95 — 100 percent.
b) Sixty days at 20°C (68°F) and relative humidity of 95 — 100 percent with a 1 inch (25.4 mm) column of water maintained on the top of the seal.
