UL 1479-2021 pdf free download.STANDARD FOR SAFETY Fire Tests of Penetration Firestops. 5.1.1.4 The periphery of the test sample is to be not closer than 1-1/2 times the thickness of the test assembly, or a minimum of 12 in (300 mm), to the furnace edge, whichever is greater. The distance between the test sample periphery and furnace edge can be reduced if it is demonstrated that the edge effects do not affect the test results. 5.1.2 Membrane-penetration firestop systems for other than outlet boxes 5.1.2.1 For membrane-penetration firestop systems for other than outlet boxes, the penetrations and supporting construction to be tested shall be representative of the construction for which ratings are desired with respect to materials, workmanship, and details such as dimensions of parts. The membrane- penetration firestop system is to be installed in accordance with the manufacturer’s specified installation instruction procedure. 5.1.2.2 Each representative construction type of membrane-penetration flrestop system for which rating is desired is to be tested. The membrane-penetration system. other than metallic outlet boxes, shall be evaluated with the firestop system exposed to the furnace condition and also a second configuration with the firestop system facing away from the furnace. If it is determined by the testing laboratory that one exposure is representative of both exposures, the testing laboratory shall test that one exposure. 5.1.3 Membrane-penetration firestop systems for outlet boxes 5.1 .3.1 For membrane-penetration firestop systems for outlet boxes, the penetrations and supporting construction to be tested shall be representative of the type construction for which ratings are desired with respect to materials, workmanship, and details such as dimensions of parts. The membrane-penetration firestop system for outlet boxes is to be installed in accordance with the manufacturer’s specified installation instruction procedure, 5.1.3.2 Unless a different rating is desired for a different construction scheme, the outlet boxes are to be installed in the test sample which is minimum 48 in (1219 mm) in width as indicated in Figure 5.2. The exposed surface shall contain one receptacle outlet box with faceplate positioned at the height of 12 in (305 mm) from the bottom of the test assembly. The unexposed surface shall contain one outlet box with facep’ate and one switch outlet box with faceplate. The exposed surface outlet box and the unexposed surface outlet box shall be located at the same level in the assembly with the maximum 24 in (610 mm) space and interconnected with...
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